CHECKPNGFORMAT Printer Escape function
The CHECKPNGFORMAT printer escape function determines whether a printer supports printing a PNG image.
To perform this check, call the ExtEscape function with the following parameters.
Syntax
int ExtEscape(
_In_ HDC hdc,
_In_ int nEscape,
_In_ int cbInput,
_In_ LPCSTR lpszInData,
_In_ int cbOutput,
_Out_ LPSTR lpszOutData
);
Parameters
hdc [in]
A handle to the printer device context.nEscape [in]
The escape function to be performed.Value Meaning CHECKPNGFORMAT Checks whether the printer supports printing a PNG image.
cbInput [in]
The size, in bytes, of the PNG image buffer pointed to by the lpszInData parameter.lpszInData [in]
A pointer to a buffer that contains the PNG image.cbOutput [in]
The number of bytes of data pointed to by the lpszOutData parameter.For this escape, set this value to
sizeof ( DWORD ).lpszOutData [out]
A pointer to the DWORD variable that receives the output from this escape. This parameter must not be NULL.If the printer supports the image type, this value is set to 1. Otherwise, it is set to zero.
Return value
The return value is greater than zero if the function is successful and less than zero if not. A return value of zero indicates that the printer does not support this check.
Remarks
Before using the CHECKJPEGFORMAT printer escape function, call the QUERYESCSUPPORT printer escape function to determine whether the driver supports CHECKJPEGFORMAT. For sample code, see Testing a Printer for JPEG or PNG Support.
Requirements
Minimum supported client |
Windows 2000 Professional [desktop apps only] |
Minimum supported server |
Windows 2000 Server [desktop apps only] |
Header |
Wingdi.h (include Windows.h) |