The CreateDC function creates a device context (DC) for a device by using the specified name.
HDC CreateDC(
LPCTSTR lpszDriver, |
// pointer to string specifying driver name |
LPCTSTR lpszDevice, |
// pointer to string specifying device name |
LPCTSTR lpszOutput, |
// do not use; set to NULL |
CONST DEVMODE *lpInitData |
// pointer to optional printer data |
); |
Windows 95: In Win32-based applications, this parameter is ignored and should be NULL, with one exception: You may obtain a display device context by specifying the null-terminated string “DISPLAY”. If this parameter is “DISPLAY”, all other parameters must be NULL.
Windows NT: Points to a null-terminated character string that specifies
either “DISPLAY” for a display driver, or the name of a printer driver, which
is usually “WINSPOOL”.
If the function succeeds, the return value is the handle to a device context for the specified device.
If the function fails, the return value is NULL. To get extended error information, call GetLastError.
Applications written for earlier versions of Windows used the lpszOutput parameter to specify a port name or to print to a file. Win32-based applications do not need to specify a port name. Win32-based applications can print to a file by calling the StartDoc function with a DOCINFO structure whose lpszOutput member specifies the path of the output filename.
When you no longer need the device context, call the DeleteDC function to delete it.
DeleteDC, DEVMODE, DOCINFO, DocumentProperties, StartDoc
file: /Techref/os/win/api/win32/func/src/f08_11.htm, 4KB, , updated: 2001/6/24 04:58, local time: 2024/8/23 02:11,
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