The ExtEscape function allows applications to access capabilities of a particular device that are not available through GDI.
int ExtEscape(
HDC hdc, |
// handle to device context |
int nEscape, |
// escape function |
int cbInput, |
// number of bytes in input structure |
LPCSTR lpszInData, |
// pointer to input structure |
int cbOutput, |
// number of bytes in output structure |
LPSTR lpszOutData |
// pointer to output structure |
); |
The return value specifies the outcome of the function. It is greater than zero if the function is successful, except for the QUERYESCSUPPORT printer escape, which checks for implementation only. The return value is zero if the escape is not implemented. A return value less than zero indicates an error. To get extended error information, call GetLastError.
Use this function to pass a driver-defined escape value to a device.
Use the Escape function to pass one of the escape values defined by Windows to a device. ExtEscape might not work properly with the escapes defined by Windows. In particular, escapes in which lpszInData points to a structure that contains a member that is a pointer will fail.
file: /Techref/os/win/api/win32/func/src/f23_5.htm, 3KB, , updated: 2000/4/7 12:19, local time: 2024/8/23 08:48,
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