getprndc.c

来自「《Windows程序设计》配套代码、LZW压缩算法源代码、Socket异步通信示」· C语言 代码 · 共 44 行

/*-------------------------------------
   GETPRNDC.C -- GetPrinterDC function
  -------------------------------------*/

#include <windows.h>

HDC GetPrinterDC (void)
{
     DWORD            dwNeeded, dwReturned ;
     HDC              hdc ;
     PRINTER_INFO_4 * pinfo4 ;
     PRINTER_INFO_5 * pinfo5 ; 

     if (GetVersion () & 0x80000000)         // Windows 98
     {
          EnumPrinters (PRINTER_ENUM_DEFAULT, NULL, 5, NULL,
                        0, &dwNeeded, &dwReturned) ;

          pinfo5 = malloc (dwNeeded) ;

          EnumPrinters (PRINTER_ENUM_DEFAULT, NULL, 5, (PBYTE) pinfo5,
                        dwNeeded, &dwNeeded, &dwReturned) ;

          hdc = CreateDC (NULL, pinfo5->pPrinterName, NULL, NULL) ;

          free (pinfo5) ;
     }
     else                                    // Windows NT
     {
          EnumPrinters (PRINTER_ENUM_LOCAL, NULL, 4, NULL,
                        0, &dwNeeded, &dwReturned) ;

          pinfo4 = malloc (dwNeeded) ;

          EnumPrinters (PRINTER_ENUM_LOCAL, NULL, 4, (PBYTE) pinfo4,
                        dwNeeded, &dwNeeded, &dwReturned) ;

          hdc = CreateDC (NULL, pinfo4->pPrinterName, NULL, NULL) ;

          free (pinfo4) ;
     }
     return hdc ;   
}