The DrvStartDoc function is called by GDI when it is ready to start sending a document to the driver for rendering.
- pso [in]
Caller-supplied pointer to a SURFOBJ structure.
- pwszDocName [in]
Caller-supplied pointer to a NULL-terminated Unicode string specifying the name of the document to be printed.
- dwJobId [in]
Caller-supplied print job number. This value is returned to GDI from the spooler in a call to StartDocPrinter.
If the operation succeeds, the function should return TRUE. Otherwise, it should call the Win32 SetLastError function to set an error code, and then return FALSE.
A printer graphics DLL must provide a DrvStartDoc function. Typically the function is used for sending control sequences to printer hardware, before a document is printed, by calling GDI's EngWritePrinter function. The function can also perform internal, document-specific initialization operations for the printer graphics DLL.
The DrvStartDoc function is called at the start of a print job, and whenever an application (such as a print processor) calls ResetDC (see DrvResetPDEV). When the call to DrvStartDoc comes from ResetDC, the pwszDocName parameter is set to NULL and the dwJobId parameter is set to zero. When the call comes from an application, these parameters are set, respectively, to the document name and the print job number.
Because there is not a separate call into the printer graphics DLL when a print job is started, the DrvStartDoc function must also send control sequences to the printer to initialize the job, if required by the printer. (In other words, there is one document per job.)