Advantech DVP-7020, User Manual

Page: 45 / 65

Adv_VAPI_SetCaptureBuf
Syntax
[C++]
BOOL Adv_VAPI_SetCaptureBuf(int nChannelNo,PBYTE
pBuf,DWORD dwSize,int nFrameCount,Adv_CompleteProc pCall)
[Delphi]
function Adv_VAPI_SetCaptureBuf(nChannelNo:Integer;
pBuf:POINTER; dwSize:Longword; nFrameCount:Integer;
pCall:Adv_CompleteProc):Boolean;
[VB]
function Adv_VAPI_SetCaptureBuf (ByVal nChannelNo As
Integer, ByVal pBuf As Long, ByVal dwSize As Long, ByVal
nFrameCount As Integer, ByVal pCall As Long) As Boolean
Parameters
nChannelNo : Specifies the video channel number on
current physical port. Its range should be
0~3.
pBuf : Specifies the capture buffer for the video
channel on current physical port. If the buffer
address is NULL, the capture buffer of video
channel will be canceled.
dwSize : Specifies total number of buffer. You should
allocate enough space to buffer.
nFrameCount : Specifies total frame number to capture. If
the value is ALWAYS_CAPTURE, the
capture frame is endless.
pCall : Pointer to callback function to notify the
capture completed. The function should be
declared as follows:
BOOL CALLBACK YourCompleteProc (DWORD
dwStatus)
The value of the parameter dwStatus has one
of the following:
DEST_HWND defines windows capture
completed.
DEST_BUF defines buffer capture
completed.
DEST_FILE defines file capture
completed.
41