QUERYESCSUPPORT Printer Escape function
The QUERYESCSUPPORT printer escape function checks the implementation of a printer escape function.
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 QUERYESCSUPPORT Determines whether the device driver implements a particular escape function.
cbInput [in]
The number of bytes of data pointed to by the lpszInData parameter.For this escape, set this value to
sizeof ( DWORD ).lpszInData [in]
A pointer to the DWORD that contains the escape value to query. The value can be an application-defined escape value or one of the following pre-defined escape values.Value Meaning CHECKJPEGFORMAT Checks whether the printer supports JPEG images.
CHECKPNGFORMAT Checks whether the printer supports PNG images.
DRAWPATTERNRECT Draws a white, gray-scale, or black rectangle.
GET_PS_FEATURESETTING Gets information about a specified feature setting of a PostScript driver.
GETTECHNOLOGY Reports on whether the driver is a Postscript driver.
PASSTHROUGH Allows the application to send data directly to a printer. Supported in compatibility mode and GDI-centric mode.
POSTSCRIPT_DATA Allows the application to send data directly to a printer. Supported only in compatibility mode.
POSTSCRIPT_IDENTIFY Sets a PostScript driver to GDI-centric or PostScript-centric mode.
POSTSCRIPT_INJECTION Inserts a block of raw data in a PostScript job stream.
POSTSCRIPT_PASSTHROUGH Sends data directly to a PostScript printer driver. Supported in compatibility mode and PostScript-centric mode.
SPCLPASSTHROUGH2 Enables applications to include private procedures and other resources at the document-level save context.
cbOutput [in]
The number of bytes of data pointed to by the lpszOutData parameter.For this printer escape function, the value of this parameter is 0.
lpszOutData [out]
A pointer to the structure that receives output from this escape.For this printer escape function, the value of the parameter is NULL.
Return value
If the escape function specified in lpszInData is supported, the function returns a value greater than zero. If the function specified in lpszInData is not supported, the function returns zero. If an error occurs, the function returns a value less than zero.
Requirements
Header |
Wingdi.h |