WM_CAP_FILE_ALLOCATE message
The WM_CAP_FILE_ALLOCATE message creates (preallocates) a capture file of a specified size. You can send this message explicitly or by using the capFileAlloc macro.
WM_CAP_FILE_ALLOCATE
wParam = (WPARAM) 0;
lParam = (LPARAM) (DWORD) (dwSize);
Parameters
-
dwSize
-
Size, in bytes, to create the capture file.
Return Value
Returns TRUE if successful or FALSE otherwise.
If an error occurs and an error callback function is set using the WM_CAP_SET_CALLBACK_ERROR message, the error callback function is called.
Remarks
You can improve streaming capture performance significantly by preallocating a capture file large enough to store an entire video clip and by defragmenting the capture file before capturing the clip.
Requirements
| Requirement | Value |
|---|---|
| Minimum supported client |
Windows 2000 Professional [desktop apps only] |
| Minimum supported server |
Windows 2000 Server [desktop apps only] |
| Header |
|