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The PrtFilterAlloc function is called to obtain a data buffer from the user filter DLL in which to pass it the print data.
Syntax
void * WINAPI PrtFilterAlloc(
DWORD BufLen
);
Parameters
BufLen
Supplied parameter. Indicates the length of buffer required.
Return Value
The PrtFilterAlloc function allocates a memory block of BufLen size and returns a pointer to the buffer. This function should return a NULL pointer on failure.