| vb下视频捕捉中的问题 作者：admin 转贴自：csdn 点击数：347
下面是一个视频捕捉的一个例子，希望对您有用。 Public Const WM_USER = &H400
Public Const WM_CAP_START = WM_USER
Public Const WM_CAP_FILE_SAVEAS = WM_CAP_START + 23
Public Const WM_CAP_SEQUENCE = WM_CAP_START + 62
Public Const WM_CAP_SET_SEQUENCE_SETUP = WM_CAP_START + 64
Public Const WM_CAP_GET_SEQUENCE_SETUP = WM_CAP_START + 65
Type CAPTUREPARMS
dwRequestMicroSecPerFrame As Long '// Requested capture rate
fMakeUserHitOKToCapture As Long '// Show Hit OK to cap dlg?
wPercentDropForError As Long '// Give error msg if > (10%)
fYield As Long '// Capture via background task?
dwIndexSize As Long '// Max index size in frames (32K)
wChunkGranularity As Long '// Junk chunk granularity (2K)
fUsingDOSMemory As Long '// Use DOS buffers?
wNumVideoRequested As Long '// # video buffers, If 0, autocalc
fCaptureAudio As Long '// Capture audio?
wNumAudioRequested As Long '// # audio buffers, If 0, autocalc
vKeyAbort As Long '// Virtual key causing abort
fAbortLeftMouse As Long '// Abort on left mouse?
fAbortRightMouse As Long '// Abort on right mouse?
fLimitEnabled As Long '// Use wTimeLimit?
wTimeLimit As Long '// Seconds to capture
fMCIControl As Long '// Use MCI video source?
fStepMCIDevice As Long '// Step MCI device?
dwMCIStartTime As Long '// Time to start in MS
dwMCIStopTime As Long '// Time to stop in MS
fStepCaptureAt2x As Long '// Perform spatial averaging 2x
wStepCaptureAverageFrames As Long '// Temporal average n Frames
dwAudioBufferSize As Long '// Size of audio bufs (0 = default)
fDisableWriteCache As Long '// Attempt to disable write cache
End Type Function capFileSaveAs(ByVal lwnd As Long, szName As String) As Boolean
capFileSaveAs = SendMessageS(lwnd, WM_CAP_FILE_SAVEAS, 0, szName)
End Function
Function capCaptureSequence(ByVal lwnd As Long) As Boolean
capCaptureSequence = SendMessage(lwnd, WM_CAP_SEQUENCE, 0, 0)
End Function
Function capCaptureGetSetup(ByVal lwnd As Long, ByVal s As Long, ByVal wSize As Integer) As Boolean
capCaptureGetSetup = SendMessage(lwnd, WM_CAP_GET_SEQUENCE_SETUP, wSize, s)
End Function Private Sub mnuStart_Click()
' /*
' * If Start is selected from the menu, start Streaming capture.
' * The streaming capture is terminated when the Escape key is pressed
' */
Dim sFileName As String
Dim CAP_PARAMS As CAPTUREPARMS
capCaptureGetSetup lwndC, VarPtr(CAP_PARAMS), Len(CAP_PARAMS)
CAP_PARAMS.dwRequestMicroSecPerFrame = (1 * (10 ^ 6)) / 30 ' 30 Frames per second
CAP_PARAMS.fMakeUserHitOKToCapture = True
CAP_PARAMS.fCaptureAudio = False
capCaptureSetSetup lwndC, VarPtr(CAP_PARAMS), Len(CAP_PARAMS)
sFileName = C:\myvideo.avi
capCaptureSequence lwndC ' Start Capturing!
capFileSaveAs lwndC, sFileName ' Copy video from swap file into a real file. End Sub
'// ------------------------------------------------------------------
'// Windows API Constants / Types / Declarations
'// ------------------------------------------------------------------
Public Const WS_BORDER = &H800000
Public Const WS_CAPTION = &HC00000
Public Const WS_SYSMENU = &H80000
Public Const WS_CHILD = &H40000000
Public Const WS_VISIBLE = &H10000000
Public Const WS_OVERLAPPED = &H0&
Public Const WS_MINIMIZEBOX = &H20000
Public Const WS_MAXIMIZEBOX = &H10000
Public Const WS_THICKFRAME = &H40000
Public Const WS_OVERLAPPEDWINDOW = (WS_OVERLAPPED Or WS_CAPTION Or WS_SYSMENU Or WS_THICKFRAME Or WS_MINIMIZEBOX Or WS_MAXIMIZEBOX)
Public Const SWP_NOMOVE = &H2
Public Const SWP_NOSIZE = 1
Public Const SWP_NOZORDER = &H4
Public Const HWND_BOTTOM = 1
Public Const HWND_TOPMOST = -1
Public Const HWND_NOTOPMOST = -2
Public Const SM_CYCAPTION = 4
Public Const SM_CXFRAME = 32
Public Const SM_CYFRAME = 33
Public Const WS_EX_TRANSPARENT = &H20&
Public Const GWL_STYLE = (-16)
Declare Function SetWindowLong Lib user32 Alias SetWindowLongA (ByVal hWnd As Long, ByVal nIndex As Long, ByVal dwNewLong As Long) As Long
'// Memory manipulation
Declare Function lStrCpy Lib kernel32 Alias lstrcpyA (ByVal lpString1 As Long, ByVal lpString2 As Long) As Long
Declare Function lStrCpyn Lib kernel32 Alias lstrcpynA (ByVal lpString1 As Any, ByVal lpString2 As Long, ByVal iMaxLength As Long) As Long
Declare Sub RtlMoveMemory Lib kernel32 (ByVal hpvDest As Long, ByVal hpvSource As Long, ByVal cbCopy As Long)
Declare Sub hmemcpy Lib kernel32 (hpvDest As Any, hpvSource As Any, ByVal cbCopy As Long)
'// Window manipulation
Declare Function SetWindowPos Lib user32 (ByVal hWnd As Long, ByVal hWndInsertAfter As Long, ByVal x As Long, ByVal y As Long, ByVal cx As Long, ByVal cy As Long, ByVal wFlags As Long) As Long
Declare Function DestroyWindow Lib user32 (ByVal hndw As Long) As Boolean
Declare Function GetSystemMetrics Lib user32 (ByVal nIndex As Long) As Long
Declare Function SetWindowText Lib user32 Alias SetWindowTextA (ByVal hWnd As Long, ByVal lpString As String) As Long Public lwndC As Long ' Handle to the Capture Windows Function MyFrameCallback(ByVal lwnd As Long, ByVal lpVHdr As Long) As Long Debug.Print FrameCallBack
Dim VideoHeader As VIDEOHDR
Dim VideoData() As Byte
'//Fill VideoHeader with data at lpVHdr
RtlMoveMemory VarPtr(VideoHeader), lpVHdr, Len(VideoHeader)
'// Make room for data
ReDim VideoData(VideoHeader.dwBytesUsed)
'//Copy data into the array
RtlMoveMemory VarPtr(VideoData(0)), VideoHeader.lpData, VideoHeader.dwBytesUsed Debug.Print VideoHeader.dwBytesUsed
Debug.Print VideoData
End Function Function MyYieldCallback(lwnd As Long) As Long Debug.Print Yield End Function Function MyErrorCallback(ByVal lwnd As Long, ByVal iID As Long, ByVal ipstrStatusText As Long) As Long
If iID = 0 Then Exit Function
Dim sStatusText As String
Dim usStatusText As String
'Convert the Pointer to a real VB String
sStatusText = String$(255, 0) '// Make room for message
lStrCpy StrPtr(sStatusText), ipstrStatusText '// Copy message into String
sStatusText = Left$(sStatusText, InStr(sStatusText, Chr$(0)) - 1) '// Only look at left of null
usStatusText = StrConv(sStatusText, vbUnicode) '// Convert Unicode
LogError usStatusText, iID End Function Function MyStatusCallback(ByVal lwnd As Long, ByVal iID As Long, ByVal ipstrStatusText As Long) As Long If iID = 0 Then Exit Function
Dim sStatusText As String
Dim usStatusText As String
'// Convert the Pointer to a real VB String
sStatusText = String$(255, 0) '// Make room for message
lStrCpy StrPtr(sStatusText), ipstrStatusText '// Copy message into String
sStatusText = Left$(sStatusText, InStr(sStatusText, Chr$(0)) - 1) '// Only look at left of null
usStatusText = StrConv(sStatusText, vbUnicode) '// Convert Unicode
frmMain.StatusBar.SimpleText = usStatusText
Debug.Print Status: , usStatusText, iID Select Case iID '
End Select
End Function Sub ResizeCaptureWindow(ByVal lwnd As Long) Dim CAPSTATUS As CAPSTATUS
Dim lCaptionHeight As Long
Dim lX_Border As Long
Dim lY_Border As Long
lCaptionHeight = GetSystemMetrics(SM_CYCAPTION)
lX_Border = GetSystemMetrics(SM_CXFRAME)
lY_Border = GetSystemMetrics(SM_CYFRAME)
'// Get the capture window attributes .. width and height
If capGetStatus(lwnd, VarPtr(CAPSTATUS), Len(CAPSTATUS)) Then
'// Resize the capture window to the capture sizes
SetWindowPos lwnd, HWND_BOTTOM, 0, 0, _
CAPSTATUS.uiImageWidth + (lX_Border * 2), _
CAPSTATUS.uiImageHeight + lCaptionHeight + (lY_Border * 2), _
SWP_NOMOVE Or SWP_NOZORDER
End If Debug.Print Resize Window. End Sub Function MyVideoStreamCallback(lwnd As Long, lpVHdr As Long) As Long Beep '// Replace this with your code!
End Function Function MyWaveStreamCallback(lwnd As Long, lpVHdr As Long) As Long Debug.Print WaveStream End Function Sub LogError(txtError As String, lID As Long) frmMain.StatusBar.SimpleText = txtError
Debug.Print Error: , txtError, lID
End Sub '// ------------------------------------------------------------------
'// Windows API Constants / Types / Declarations
'// ------------------------------------------------------------------
Public Const WM_USER = &H400
Type POINTAPI
x As Long
y As Long
End Type
Declare Function SendMessage Lib user32 Alias SendMessageA (ByVal hWnd As Long, ByVal wMsg As Long, ByVal wParam As Integer, ByVal lParam As Long) As Long
Declare Function SendMessageS Lib user32 Alias SendMessageA (ByVal hWnd As Long, ByVal wMsg As Long, ByVal wParam As Integer, ByVal lParam As String) As Long '// ------------------------------------------------------------------
'// Window Messages WM_CAP... which can be sent to an AVICAP window
'// ------------------------------------------------------------------ '// Defines start of the message range
Public Const WM_CAP_START = WM_USER Public Const WM_CAP_GET_CAPSTREAMPTR = WM_CAP_START + 1 Public Const WM_CAP_SET_CALLBACK_ERROR = WM_CAP_START + 2
Public Const WM_CAP_SET_CALLBACK_STATUS = WM_CAP_START + 3
Public Const WM_CAP_SET_CALLBACK_YIELD = WM_CAP_START + 4
Public Const WM_CAP_SET_CALLBACK_FRAME = WM_CAP_START + 5
Public Const WM_CAP_SET_CALLBACK_VIDEOSTREAM = WM_CAP_START + 6
Public Const WM_CAP_SET_CALLBACK_WAVESTREAM = WM_CAP_START + 7
Public Const WM_CAP_GET_USER_DATA = WM_CAP_START + 8
Public Const WM_CAP_SET_USER_DATA = WM_CAP_START + 9
Public Const WM_CAP_DRIVER_CONNECT = WM_CAP_START + 10
Public Const WM_CAP_DRIVER_DISCONNECT = WM_CAP_START + 11
Public Const WM_CAP_DRIVER_GET_NAME = WM_CAP_START + 12
Public Const WM_CAP_DRIVER_GET_VERSION = WM_CAP_START + 13
Public Const WM_CAP_DRIVER_GET_CAPS = WM_CAP_START + 14 Public Const WM_CAP_FILE_SET_CAPTURE_FILE = WM_CAP_START + 20
Public Const WM_CAP_FILE_GET_CAPTURE_FILE = WM_CAP_START + 21
Public Const WM_CAP_FILE_ALLOCATE = WM_CAP_START + 22
Public Const WM_CAP_FILE_SAVEAS = WM_CAP_START + 23
Public Const WM_CAP_FILE_SET_INFOCHUNK = WM_CAP_START + 24
Public Const WM_CAP_FILE_SAVEDIB = WM_CAP_START + 25 Public Const WM_CAP_EDIT_COPY = WM_CAP_START + 30 Public Const WM_CAP_SET_AUDIOFORMAT = WM_CAP_START + 35
Public Const WM_CAP_GET_AUDIOFORMAT = WM_CAP_START + 36 Public Const WM_CAP_DLG_VIDEOFORMAT = WM_CAP_START + 41
Public Const WM_CAP_DLG_VIDEOSOURCE = WM_CAP_START + 42
Public Const WM_CAP_DLG_VIDEODISPLAY = WM_CAP_START + 43
Public Const WM_CAP_GET_VIDEOFORMAT = WM_CAP_START + 44
Public Const WM_CAP_SET_VIDEOFORMAT = WM_CAP_START + 45
Public Const WM_CAP_DLG_VIDEOCOMPRESSION = WM_CAP_START + 46 Public Const WM_CAP_SET_PREVIEW = WM_CAP_START + 50
Public Const WM_CAP_SET_OVERLAY = WM_CAP_START + 51
Public Const WM_CAP_SET_PREVIEWRATE = WM_CAP_START + 52
Public Const WM_CAP_SET_SCALE = WM_CAP_START + 53
Public Const WM_CAP_GET_STATUS = WM_CAP_START + 54
Public Const WM_CAP_SET_SCROLL = WM_CAP_START + 55 Public Const WM_CAP_GRAB_FRAME = WM_CAP_START + 60
Public Const WM_CAP_GRAB_FRAME_NOSTOP = WM_CAP_START + 61 Public Const WM_CAP_SEQUENCE = WM_CAP_START + 62
Public Const WM_CAP_SEQUENCE_NOFILE = WM_CAP_START + 63
Public Const WM_CAP_SET_SEQUENCE_SETUP = WM_CAP_START + 64
Public Const WM_CAP_GET_SEQUENCE_SETUP = WM_CAP_START + 65
Public Const WM_CAP_SET_MCI_DEVICE = WM_CAP_START + 66
Public Const WM_CAP_GET_MCI_DEVICE = WM_CAP_START + 67
Public Const WM_CAP_STOP = WM_CAP_START + 68
Public Const WM_CAP_ABORT = WM_CAP_START + 69 Public Const WM_CAP_SINGLE_FRAME_OPEN = WM_CAP_START + 70
Public Const WM_CAP_SINGLE_FRAME_CLOSE = WM_CAP_START + 71
Public Const WM_CAP_SINGLE_FRAME = WM_CAP_START + 72 Public Const WM_CAP_PAL_OPEN = WM_CAP_START + 80
Public Const WM_CAP_PAL_SAVE = WM_CAP_START + 81
Public Const WM_CAP_PAL_PASTE = WM_CAP_START + 82
Public Const WM_CAP_PAL_AUTOCREATE = WM_CAP_START + 83
Public Const WM_CAP_PAL_MANUALCREATE = WM_CAP_START + 84 '// Following added post VFW 1.1
Public Const WM_CAP_SET_CALLBACK_CAPCONTROL = WM_CAP_START + 85 '// Defines end of the message range
Public Const WM_CAP_END = WM_CAP_SET_CALLBACK_CAPCONTROL '// ------------------------------------------------------------------
'// Structures
'// ------------------------------------------------------------------
Type CAPDRIVERCAPS
wDeviceIndex As Long ' // Driver index in system.ini
fHasOverlay As Long ' // Can device overlay?
fHasDlgVideoSource As Long ' // Has Video source dlg?
fHasDlgVideoFormat As Long ' // Has Format dlg?
fHasDlgVideoDisplay As Long ' // Has External out dlg?
fCaptureInitialized As Long ' // Driver ready to capture?
fDriverSuppliesPalettes As Long ' // Can driver make palettes?
hVideoIn As Long ' // Driver In channel
hVideoOut As Long ' // Driver Out channel
hVideoExtIn As Long ' // Driver Ext In channel
hVideoExtOut As Long ' // Driver Ext Out channel
End Type Type CAPSTATUS
uiImageWidth As Long '// Width of the image
uiImageHeight As Long '// Height of the image
fLiveWindow As Long '// Now Previewing video?
fOverlayWindow As Long '// Now Overlaying video?
fScale As Long '// Scale image to client?
ptScroll As POINTAPI '// Scroll position
fUsingDefaultPalette As Long '// Using default driver palette?
fAudioHardware As Long '// Audio hardware present?
fCapFileExists As Long '// Does capture file exist?
dwCurrentVideoFrame As Long '// # of video frames cap'td
dwCurrentVideoFramesDropped As Long '// # of video frames dropped
dwCurrentWaveSamples As Long '// # of wave samples cap'td
dwCurrentTimeElapsedMS As Long '// Elapsed capture duration
hPalCurrent As Long '// Current palette in use
fCapturingNow As Long '// Capture in progress?
dwReturn As Long '// Error value after any operation
wNumVideoAllocated As Long '// Actual number of video buffers
wNumAudioAllocated As Long '// Actual number of audio buffers
End Type Type CAPTUREPARMS
dwRequestMicroSecPerFrame As Long '// Requested capture rate
fMakeUserHitOKToCapture As Long '// Show Hit OK to cap dlg?
wPercentDropForError As Long '// Give error msg if > (10%)
fYield As Long '// Capture via background task?
dwIndexSize As Long '// Max index size in frames (32K)
wChunkGranularity As Long '// Junk chunk granularity (2K)
fUsingDOSMemory As Long '// Use DOS buffers?
wNumVideoRequested As Long '// # video buffers, If 0, autocalc
fCaptureAudio As Long '// Capture audio?
wNumAudioRequested As Long '// # audio buffers, If 0, autocalc
vKeyAbort As Long '// Virtual key causing abort
fAbortLeftMouse As Long '// Abort on left mouse?
fAbortRightMouse As Long '// Abort on right mouse?
fLimitEnabled As Long '// Use wTimeLimit?
wTimeLimit As Long '// Seconds to capture
fMCIControl As Long '// Use MCI video source?
fStepMCIDevice As Long '// Step MCI device?
dwMCIStartTime As Long '// Time to start in MS
dwMCIStopTime As Long '// Time to stop in MS
fStepCaptureAt2x As Long '// Perform spatial averaging 2x
wStepCaptureAverageFrames As Long '// Temporal average n Frames
dwAudioBufferSize As Long '// Size of audio bufs (0 = default)
fDisableWriteCache As Long '// Attempt to disable write cache
End Type Type CAPINFOCHUNK
fccInfoID As Long '// Chunk ID, ICOP for copyright
lpData As Long '// pointer to data
cbData As Long '// size of lpData
End Type Type VIDEOHDR
lpData As Long '// address of video buffer
dwBufferLength As Long '// size, in bytes, of the Data buffer
dwBytesUsed As Long '// see below
dwTimeCaptured As Long '// see below
dwUser As Long '// user-specific data
dwFlags As Long '// see below
dwReserved(3) As Long '// reserved; do not use}
End Type '// The two functions exported by AVICap
Declare Function capCreateCaptureWindowA Lib avicap32.dll ( _
ByVal lpszWindowName As String, _
ByVal dwStyle As Long, _
ByVal x As Long, ByVal y As Long, ByVal nWidth As Long, ByVal nHeight As Integer, _
ByVal hWndParent As Long, ByVal nID As Long) As Long
Declare Function capGetDriverDescriptionA Lib avicap32.dll ( _
ByVal wDriver As Integer, _
ByVal lpszName As String, _
ByVal cbName As Long, _
ByVal lpszVer As String, _
ByVal cbVer As Long) As Boolean '// ------------------------------------------------------------------
'// String IDs from status and error callbacks
'// ------------------------------------------------------------------ Public Const IDS_CAP_BEGIN = 300 '/* Capture Start */
Public Const IDS_CAP_END = 301 '/* Capture End */ Public Const IDS_CAP_INFO = 401 '/* %s */
Public Const IDS_CAP_OUTOFMEM = 402 '/* Out of memory */
Public Const IDS_CAP_FILEEXISTS = 403 '/* File '%s' exists -- overwrite it? */
Public Const IDS_CAP_ERRORPALOPEN = 404 '/* Error opening palette '%s' */
Public Const IDS_CAP_ERRORPALSAVE = 405 '/* Error saving palette '%s' */
Public Const IDS_CAP_ERRORDIBSAVE = 406 '/* Error saving frame '%s' */
Public Const IDS_CAP_DEFAVIEXT = 407 '/* avi */
Public Const IDS_CAP_DEFPALEXT = 408 '/* pal */
Public Const IDS_CAP_CANTOPEN = 409 '/* Cannot open '%s' */
Public Const IDS_CAP_SEQ_MSGSTART = 410 '/* Select OK to start capture\nof video sequence\nto %s. */
Public Const IDS_CAP_SEQ_MSGSTOP = 411 '/* Hit ESCAPE or click to end capture */
Public Const IDS_CAP_VIDEDITERR = 412 '/* An error occurred while trying to run VidEdit. */
Public Const IDS_CAP_READONLYFILE = 413 '/* The file '%s' is a read-only file. */
Public Const IDS_CAP_WRITEERROR = 414 '/* Unable to write to file '%s'.\nDisk may be full. */
Public Const IDS_CAP_NODISKSPACE = 415 '/* There is no space to create a capture file on the specified device. */
Public Const IDS_CAP_SETFILESIZE = 416 '/* Set File Size */
Public Const IDS_CAP_SAVEASPERCENT = 417 '/* SaveAs: %2ld%% Hit Escape to abort. */
Public Const IDS_CAP_DRIVER_ERROR = 418 '/* Driver specific error message */ Public Const IDS_CAP_WAVE_OPEN_ERROR = 419 '/* Error: Cannot open the wave input device.\nCheck sample size, frequency, and channels. */
Public Const IDS_CAP_WAVE_ALLOC_ERROR = 420 '/* Error: Out of memory for wave buffers. */
Public Const IDS_CAP_WAVE_PREPARE_ERROR = 421 '/* Error: Cannot prepare wave buffers. */
Public Const IDS_CAP_WAVE_ADD_ERROR = 422 '/* Error: Cannot add wave buffers. */
Public Const IDS_CAP_WAVE_SIZE_ERROR = 423 '/* Error: Bad wave size. */
Public Const IDS_CAP_VIDEO_OPEN_ERROR = 424 '/* Error: Cannot open the video input device. */
Public Const IDS_CAP_VIDEO_ALLOC_ERROR = 425 '/* Error: Out of memory for video buffers. */
Public Const IDS_CAP_VIDEO_PREPARE_ERROR = 426 '/* Error: Cannot prepare video buffers. */
Public Const IDS_CAP_VIDEO_ADD_ERROR = 427 '/* Error: Cannot add video buffers. */
Public Const IDS_CAP_VIDEO_SIZE_ERROR = 428 '/* Error: Bad video size. */
Public Const IDS_CAP_FILE_OPEN_ERROR = 429 '/* Error: Cannot open capture file. */
Public Const IDS_CAP_FILE_WRITE_ERROR = 430 '/* Error: Cannot write to capture file. Disk may be full. */
Public Const IDS_CAP_RECORDING_ERROR = 431 '/* Error: Cannot write to capture file. Data rate too high or disk full. */
Public Const IDS_CAP_RECORDING_ERROR2 = 432 '/* Error while recording */
Public Const IDS_CAP_AVI_INIT_ERROR = 433 '/* Error: Unable to initialize for capture. */
Public Const IDS_CAP_NO_FRAME_CAP_ERROR = 434 '/* Warning: No frames captured.\nConfirm that vertical sync interrupts\nare configured and enabled. */
Public Const IDS_CAP_NO_PALETTE_WARN = 435 '/* Warning: Using default palette. */
Public Const IDS_CAP_MCI_CONTROL_ERROR = 436 '/* Error: Unable to access MCI device. */
Public Const IDS_CAP_MCI_CANT_STEP_ERROR = 437 '/* Error: Unable to step MCI device. */
Public Const IDS_CAP_NO_AUDIO_CAP_ERROR = 438 '/* Error: No audio data captured.\nCheck audio card settings. */
Public Const IDS_CAP_AVI_DRAWDIB_ERROR = 439 '/* Error: Unable to draw this data format. */
Public Const IDS_CAP_COMPRESSOR_ERROR = 440 '/* Error: Unable to initialize compressor. */
Public Const IDS_CAP_AUDIO_DROP_ERROR = 441 '/* Error: Audio data was lost during capture, reduce capture rate. */
'/* status string IDs */
Public Const IDS_CAP_STAT_LIVE_MODE = 500 '/* Live window */
Public Const IDS_CAP_STAT_OVERLAY_MODE = 501 '/* Overlay window */
Public Const IDS_CAP_STAT_CAP_INIT = 502 '/* Setting up for capture - Please wait */
Public Const IDS_CAP_STAT_CAP_FINI = 503 '/* Finished capture, now writing frame %ld */
Public Const IDS_CAP_STAT_PALETTE_BUILD = 504 '/* Building palette map */
Public Const IDS_CAP_STAT_OPTPAL_BUILD = 505 '/* Computing optimal palette */
Public Const IDS_CAP_STAT_I_FRAMES = 506 '/* %d frames */
Public Const IDS_CAP_STAT_L_FRAMES = 507 '/* %ld frames */
Public Const IDS_CAP_STAT_CAP_L_FRAMES = 508 '/* Captured %ld frames */
Public Const IDS_CAP_STAT_CAP_AUDIO = 509 '/* Capturing audio */
Public Const IDS_CAP_STAT_VIDEOCURRENT = 510 '/* Captured %ld frames (%ld dropped) %d.%03d sec. */
Public Const IDS_CAP_STAT_VIDEOAUDIO = 511 '/* Captured %d.%03d sec. %ld frames (%ld dropped) (%d.%03d fps). %ld audio bytes (%d,%03d sps) */
Public Const IDS_CAP_STAT_VIDEOONLY = 512 '/* Captured %d.%03d sec. %ld frames (%ld dropped) (%d.%03d fps) */
Function capSetCallbackonError(ByVal lwnd As Long, ByVal lpProc As Long) As Boolean
capSetCallbackonError = SendMessage(lwnd, WM_CAP_SET_CALLBACK_ERROR, 0, lpProc)
End Function
Function capSetCallbackOnStatus(ByVal lwnd As Long, ByVal lpProc As Long) As Boolean
capSetCallbackOnStatus = SendMessage(lwnd, WM_CAP_SET_CALLBACK_STATUS, 0, lpProc)
End Function
Function capSetCallbackOnYield(ByVal lwnd As Long, ByVal lpProc As Long) As Boolean
capSetCallbackOnYield = SendMessage(lwnd, WM_CAP_SET_CALLBACK_YIELD, 0, lpProc)
End Function
Function capSetCallbackOnFrame(ByVal lwnd As Long, ByVal lpProc As Long) As Boolean
capSetCallbackOnFrame = SendMessage(lwnd, WM_CAP_SET_CALLBACK_FRAME, 0, lpProc)
End Function
Function capSetCallbackOnVideoStream(ByVal lwnd As Long, ByVal lpProc As Long) As Boolean
capSetCallbackOnVideoStream = SendMessage(lwnd, WM_CAP_SET_CALLBACK_VIDEOSTREAM, 0, lpProc)
End Function
Function capSetCallbackOnWaveStream(ByVal lwnd As Long, ByVal lpProc As Long) As Boolean
capSetCallbackOnWaveStream = SendMessage(lwnd, WM_CAP_SET_CALLBACK_WAVESTREAM, 0, lpProc)
End Function
Function capSetCallbackOnCapControl(ByVal lwnd As Long, ByVal lpProc As Long) As Boolean
capSetCallbackOnCapControl = SendMessage(lwnd, WM_CAP_SET_CALLBACK_CAPCONTROL, 0, lpProc)
End Function
Function capSetUserData(ByVal lwnd As Long, ByVal lUser As Long) As Boolean
capSetUserData = SendMessage(lwnd, WM_CAP_SET_USER_DATA, 0, lUser)
End Function
Function capGetUserData(ByVal lwnd As Long) As Long
capGetUserData = SendMessage(lwnd, WM_CAP_GET_USER_DATA, 0, 0)
End Function
Function capDriverConnect(ByVal lwnd As Long, ByVal i As Integer) As Boolean
capDriverConnect = SendMessage(lwnd, WM_CAP_DRIVER_CONNECT, i, 0)
End Function
Function capDriverDisconnect(ByVal lwnd As Long) As Boolean
capDriverDisconnect = SendMessage(lwnd, WM_CAP_DRIVER_DISCONNECT, 0, 0)
End Function
Function capDriverGetName(ByVal lwnd As Long, ByVal szName As Long, ByVal wSize As Integer) As Boolean
capDriverGetName = SendMessage(lwnd, YOURCONSTANTMESSAGE, wSize, szName)
End Function
Function capDriverGetVersion(ByVal lwnd As Long, ByVal szVer As Long, ByVal wSize As Integer) As Boolean
capDriverGetVersion = SendMessage(lwnd, WM_CAP_DRIVER_GET_VERSION, wSize, szVer)
End Function
Function capDriverGetCaps(ByVal lwnd As Long, ByVal s As Long, ByVal wSize As Integer) As Boolean
capDriverGetCaps = SendMessage(lwnd, WM_CAP_DRIVER_GET_CAPS, wSize, s)
End Function
Function capFileSetCaptureFile(ByVal lwnd As Long, szName As String) As Boolean
capFileSetCaptureFile = SendMessageS(lwnd, WM_CAP_FILE_SET_CAPTURE_FILE, 0, szName)
End Function
Function capFileGetCaptureFile(ByVal lwnd As Long, ByVal szName As Long, wSize As String) As Boolean
capFileGetCaptureFile = SendMessageS(lwnd, WM_CAP_FILE_SET_CAPTURE_FILE, wSize, szName)
End Function
Function capFileAlloc(ByVal lwnd As Long, ByVal dwSize As Long) As Boolean
capFileAlloc = SendMessage(lwnd, WM_CAP_FILE_ALLOCATE, 0, dwSize)
End Function
Function capFileSaveAs(ByVal lwnd As Long, szName As String) As Boolean
capFileSaveAs = SendMessageS(lwnd, WM_CAP_FILE_SAVEAS, 0, szName)
End Function
Function capFileSetInfoChunk(ByVal lwnd As Long, ByVal lpInfoChunk As Long) As Boolean
capFileSetInfoChunk = SendMessage(lwnd, WM_CAP_FILE_SET_INFOCHUNK, 0, lpInfoChunk)
End Function
Function capFileSaveDIB(ByVal lwnd As Long, ByVal szName As Long) As Boolean
capFileSaveDIB = SendMessage(lwnd, WM_CAP_FILE_SAVEDIB, 0, szName)
End Function
Function capEditCopy(ByVal lwnd As Long) As Boolean
capEditCopy = SendMessage(lwnd, WM_CAP_EDIT_COPY, 0, 0)
End Function
Function capSetAudioFormat(ByVal lwnd As Long, ByVal s As Long, ByVal wSize As Integer) As Boolean
capSetAudioFormat = SendMessage(lwnd, WM_CAP_SET_AUDIOFORMAT, wSize, s)
End Function
Function capGetAudioFormat(ByVal lwnd As Long, ByVal s As Long, ByVal wSize As Integer) As Long
capGetAudioFormat = SendMessage(lwnd, WM_CAP_GET_AUDIOFORMAT, wSize, s)
End Function
Function capGetAudioFormatSize(ByVal lwnd As Long) As Long
capGetAudioFormatSize = SendMessage(lwnd, WM_CAP_GET_AUDIOFORMAT, 0, 0)
End Function
Function capDlgVideoFormat(ByVal lwnd As Long) As Boolean
capDlgVideoFormat = SendMessage(lwnd, WM_CAP_DLG_VIDEOFORMAT, 0, 0)
End Function
Function capDlgVideoSource(ByVal lwnd As Long) As Boolean
capDlgVideoSource = SendMessage(lwnd, WM_CAP_DLG_VIDEOSOURCE, 0, 0)
End Function
Function capDlgVideoDisplay(ByVal lwnd As Long) As Boolean
capDlgVideoDisplay = SendMessage(lwnd, WM_CAP_DLG_VIDEODISPLAY, 0, 0)
End Function
Function capDlgVideoCompression(ByVal lwnd As Long) As Boolean
capDlgVideoCompression = SendMessage(lwnd, WM_CAP_DLG_VIDEOCOMPRESSION, 0, 0)
End Function
Function capGetVideoFormat(ByVal lwnd As Long, ByVal s As Long, ByVal wSize As Integer) As Long
capGetVideoFormat = SendMessage(lwnd, WM_CAP_GET_VIDEOFORMAT, wSize, s)
End Function
Function capGetVideoFormatSize(ByVal lwnd As Long) As Long
capGetVideoFormatSize = SendMessage(lwnd, WM_CAP_GET_VIDEOFORMAT, 0, 0)
End Function
Function capSetVideoFormat(ByVal lwnd As Long, ByVal s As Long, ByVal wSize As Integer) As Boolean
capSetVideoFormat = SendMessage(lwnd, WM_CAP_SET_VIDEOFORMAT, wSize, s)
End Function
Function capPreview(ByVal lwnd As Long, ByVal f As Boolean) As Boolean
capPreview = SendMessage(lwnd, WM_CAP_SET_PREVIEW, f, 0)
End Function
Function capPreviewRate(ByVal lwnd As Long, ByVal wMS As Integer) As Boolean
capPreviewRate = SendMessage(lwnd, WM_CAP_SET_PREVIEWRATE, wMS, 0)
End Function
Function capOverlay(ByVal lwnd As Long, ByVal f As Boolean) As Boolean
capOverlay = SendMessage(lwnd, WM_CAP_SET_OVERLAY, f, 0)
End Function
Function capPreviewScale(ByVal lwnd As Long, ByVal f As Boolean) As Boolean
capPreviewScale = SendMessage(lwnd, WM_CAP_SET_SCALE, f, 0)
End Function
Function capGetStatus(ByVal lwnd As Long, ByVal s As Long, ByVal wSize As Integer) As Boolean
capGetStatus = SendMessage(lwnd, WM_CAP_GET_STATUS, wSize, s)
End Function
Function capSetScrollPos(ByVal lwnd As Long, ByVal lpP As Long) As Boolean
capSetScrollPos = SendMessage(lwnd, WM_CAP_SET_SCROLL, 0, lpP)
End Function
Function capGrabFrame(ByVal lwnd As Long) As Boolean
capGrabFrame = SendMessage(lwnd, WM_CAP_GRAB_FRAME, 0, 0)
End Function
Function capGrabFrameNoStop(ByVal lwnd As Long) As Boolean
capGrabFrameNoStop = SendMessage(lwnd, WM_CAP_GRAB_FRAME_NOSTOP, 0, 0)
End Function
Function capCaptureSequence(ByVal lwnd As Long) As Boolean
capCaptureSequence = SendMessage(lwnd, WM_CAP_SEQUENCE, 0, 0)
End Function
Function capCaptureSequenceNoFile(ByVal lwnd As Long) As Boolean
capCaptureSequenceNoFile = SendMessage(lwnd, WM_CAP_SEQUENCE_NOFILE, 0, 0)
End Function
Function capCaptureStop(ByVal lwnd As Long) As Boolean
capCaptureStop = SendMessage(lwnd, WM_CAP_STOP, 0, 0)
End Function
Function capCaptureAbort(ByVal lwnd As Long) As Boolean
capCaptureAbort = SendMessage(lwnd, WM_CAP_ABORT, 0, 0)
End Function
Function capCaptureSingleFrameOpen(ByVal lwnd As Long) As Boolean
capCaptureSingleFrameOpen = SendMessage(lwnd, WM_CAP_SINGLE_FRAME_OPEN, 0, 0)
End Function
Function capCaptureSingleFrameClose(ByVal lwnd As Long) As Boolean
capCaptureSingleFrameClose = SendMessage(lwnd, WM_CAP_SINGLE_FRAME_CLOSE, 0, 0)
End Function
Function capCaptureSingleFrame(ByVal lwnd As Long) As Boolean
capCaptureSingleFrame = SendMessage(lwnd, WM_CAP_SINGLE_FRAME, 0, 0)
End Function
Function capCaptureGetSetup(ByVal lwnd As Long, ByVal s As Long, ByVal wSize As Integer) As Boolean
capCaptureGetSetup = SendMessage(lwnd, WM_CAP_GET_SEQUENCE_SETUP, wSize, s)
End Function
Function capCaptureSetSetup(ByVal lwnd As Long, ByVal s As Long, ByVal wSize As Integer) As Boolean
capCaptureSetSetup = SendMessage(lwnd, WM_CAP_SET_SEQUENCE_SETUP, wSize, s)
End Function
Function capSetMCIDeviceName(ByVal lwnd As Long, ByVal szName As Long) As Boolean
capSetMCIDeviceName = SendMessage(lwnd, WM_CAP_SET_MCI_DEVICE, 0, szName)
End Function
Function capGetMCIDeviceName(ByVal lwnd As Long, ByVal szName As Long, ByVal wSize As Integer) As Boolean
capGetMCIDeviceName = SendMessage(lwnd, WM_CAP_GET_MCI_DEVICE, wSize, szName)
End Function
Function capPaletteOpen(ByVal lwnd As Long, ByVal szName As Long) As Boolean
capPaletteOpen = SendMessage(lwnd, WM_CAP_PAL_OPEN, 0, szName)
End Function
Function capPaletteSave(ByVal lwnd As Long, ByVal szName As Long) As Boolean
capPaletteSave = SendMessage(lwnd, WM_CAP_PAL_SAVE, 0, szName)
End Function
Function capPalettePaste(ByVal lwnd As Long) As Boolean
capPalettePaste = SendMessage(lwnd, WM_CAP_PAL_PASTE, 0, 0)
End Function
Function capPaletteAuto(ByVal lwnd As Long, ByVal iFrames As Integer, ByVal iColor As Long) As Boolean
capPaletteAuto = SendMessage(lwnd, WM_CAP_PAL_AUTOCREATE, iFrames, iColors)
End Function
Function capPaletteManual(ByVal lwnd As Long, ByVal fGrab As Boolean, ByVal iColors As Long) As Boolean
capPaletteManual = SendMessage(lwnd, WM_CAP_PAL_MANUALCREATE, fGrab, iColors)
End Function 选择窗口 Option Explicit Private Sub Command1_Click() End Sub
Private Sub cmdCancel_Click()
Unload Me
End Sub Private Sub cmdSelect_Click()
Dim sTitle As String
Dim Caps As CAPDRIVERCAPS
If cmboSource.ListIndex <> -1 Then
'// Connect the capture window to the driver
If capDriverConnect(lwndC, cmboSource.ListIndex) Then
'// Get the capabilities of the capture driver
capDriverGetCaps lwndC, VarPtr(Caps), Len(Caps)
'// If the capture driver does not support a dialog, grey it out
'// in the menu bar.
frmMain.mnuSource.Enabled = Caps.fHasDlgVideoSource
frmMain.mnuFormat.Enabled = Caps.fHasDlgVideoFormat
frmMain.mnuDisplay.Enabled = Caps.fHasDlgVideoDisplay
sTitle = cmboSource.Text
SetWindowText lwndC, sTitle
ResizeCaptureWindow lwndC
End If
End If
Unload Me
End Sub
Private Sub Form_Load()
Dim lpszName As String * 100
Dim lpszVer As String * 100
Dim x As Integer
Dim lResult As Long
Dim Caps As CAPDRIVERCAPS
'// Get a list of all the installed drivers
x = 0
Do
lResult = capGetDriverDescriptionA(x, lpszName, 100, lpszVer, 100) '// Retrieves driver info
If lResult Then
cmboSource.AddItem lpszName
x = x + 1
End If
Loop Until lResult = False '// Get the capabilities of the current capture driver
lResult = capDriverGetCaps(lwndC, VarPtr(Caps), Len(Caps))
'// Select the driver that is currently being used
If lResult Then cmboSource.ListIndex = Caps.wDeviceIndex End Sub 主窗口 Option Explicit Private Sub Form_Load()
Dim lpszName As String * 100
Dim lpszVer As String * 100
Dim Caps As CAPDRIVERCAPS
'//Create Capture Window
capGetDriverDescriptionA 0, lpszName, 100, lpszVer, 100 '// Retrieves driver info
lwndC = capCreateCaptureWindowA(lpszName, WS_CAPTION Or WS_THICKFRAME Or WS_VISIBLE Or WS_CHILD, 0, 0, 160, 120, Me.hWnd, 0) '// Set title of window to name of driver
SetWindowText lwndC, lpszName
'// Set the video stream callback function
capSetCallbackOnStatus lwndC, AddressOf MyStatusCallback
capSetCallbackonError lwndC, AddressOf MyErrorCallback
'// Connect the capture window to the driver
If capDriverConnect(lwndC, 0) Then
'/////
'// Only do the following if the connect was successful.
'// if it fails, the error will be reported in the call
'// back function.
'/////
'// Get the capabilities of the capture driver
capDriverGetCaps lwndC, VarPtr(Caps), Len(Caps)
'// If the capture driver does not support a dialog, grey it out
'// in the menu bar.
If Caps.fHasDlgVideoSource = 0 Then mnuSource.Enabled = False
If Caps.fHasDlgVideoFormat = 0 Then mnuFormat.Enabled = False
If Caps.fHasDlgVideoDisplay = 0 Then mnuDisplay.Enabled = False
'// Turn Scale on
capPreviewScale lwndC, True
'// Set the preview rate in milliseconds
capPreviewRate lwndC, 66
'// Start previewing the image from the camera
capPreview lwndC, True
'// Resize the capture window to show the whole image
ResizeCaptureWindow lwndC End If
End Sub Private Sub Form_Unload(Cancel As Integer) '// Disable all callbacks
capSetCallbackonError lwndC, vbNull
capSetCallbackOnStatus lwndC, vbNull
capSetCallbackOnYield lwndC, vbNull
capSetCallbackOnFrame lwndC, vbNull
capSetCallbackOnVideoStream lwndC, vbNull
capSetCallbackOnWaveStream lwndC, vbNull
capSetCallbackOnCapControl lwndC, vbNull
End Sub Private Sub mnuAllocate_Click() Dim sFile As String * 250
Dim lSize As Long
'// Setup swap file for capture
lSize = 1000000
sFile = C:\TEMP.AVI
capFileSetCaptureFile lwndC, sFile
capFileAlloc lwndC, lSize
End Sub Private Sub mnuAlwaysVisible_Click()
mnuAlwaysVisible.Checked = Not (mnuAlwaysVisible.Checked)
If mnuAlwaysVisible.Checked Then
SetWindowPos Me.hWnd, HWND_TOPMOST, 0, 0, 0, 0, SWP_NOSIZE Or SWP_NOMOVE
Else
SetWindowPos Me.hWnd, HWND_NOTOPMOST, 0, 0, 0, 0, SWP_NOSIZE Or SWP_NOMOVE
End If
End Sub Private Sub mnuCompression_Click()
' /*
' * Display the Compression dialog when Compression is selected from
' * the menu bar.
' */
capDlgVideoCompression lwndC End Sub Private Sub mnuCopy_Click() capEditCopy lwndC
End Sub Private Sub mnuDisplay_Click()
' /*
' * Display the Video Display dialog when Display is selected from
' * the menu bar.
' */ capDlgVideoDisplay lwndC
End Sub Private Sub mnuExit_Click() Unload Me
End Sub Private Sub mnuFormat_Click()
' /*
' * Display the Video Format dialog when Format is selected from the
' * menu bar.
' */ capDlgVideoFormat lwndC
ResizeCaptureWindow lwndC End Sub Private Sub mnuPreview_Click() frmMain.StatusBar.SimpleText = vbNullString
mnuPreview.Checked = Not (mnuPreview.Checked)
capPreview lwndC, mnuPreview.Checked
End Sub Private Sub mnuScale_Click()
mnuScale.Checked = Not (mnuScale.Checked)
capPreviewScale lwndC, mnuScale.Checked
If mnuScale.Checked Then
SetWindowLong lwndC, GWL_STYLE, WS_THICKFRAME Or WS_CAPTION Or WS_VISIBLE Or WS_CHILD
Else
SetWindowLong lwndC, GWL_STYLE, WS_BORDER Or WS_CAPTION Or WS_VISIBLE Or WS_CHILD
End If ResizeCaptureWindow lwndC
End Sub Private Sub mnuSelect_Click()
frmSelect.Show vbModal, Me End Sub Private Sub mnuSource_Click()
' /*
' * Display the Video Source dialog when Source is selected from the
' * menu bar.
' */
capDlgVideoSource lwndC End Sub Private Sub mnuStart_Click()
' /*
' * If Start is selected from the menu, start Streaming capture.
' * The streaming capture is terminated when the Escape key is pressed
' */
Dim sFileName As String
Dim CAP_PARAMS As CAPTUREPARMS
capCaptureGetSetup lwndC, VarPtr(CAP_PARAMS), Len(CAP_PARAMS)
CAP_PARAMS.dwRequestMicroSecPerFrame = (1 * (10 ^ 6)) / 30 ' 30 Frames per second
CAP_PARAMS.fMakeUserHitOKToCapture = True
CAP_PARAMS.fCaptureAudio = False
capCaptureSetSetup lwndC, VarPtr(CAP_PARAMS), Len(CAP_PARAMS)
sFileName = C:\myvideo.avi
capCaptureSequence lwndC ' Start Capturing!
capFileSaveAs lwndC, sFileName ' Copy video from swap file into a real file. End Sub
Private Sub StatusBar1_PanelClick(ByVal Panel As ComctlLib.Panel) End Sub
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