getpntdc.c

C#一个实例源代码

/*-------------------------------------
   GetPntDC.c
  -------------------------------------*/

#include <windows.h>

HDC GetPntDC (void)
{
     DWORD            dwNeeded, dwReturned ;
     HDC              hdc ;
     PRINTER_INFO_4 * pntinfo4 ;
     PRINTER_INFO_5 * pntinfo5 ; 

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

          pntinfo5 = malloc (dwNeeded) ;

          EnumPrinters (PRINTER_ENUM_DEFAULT, NULL, 5, (PBYTE) pntinfo5,
                        dwNeeded, &dwNeeded, &dwReturned) ;

          hdc = CreateDC (NULL, pntinfo5->pPrinterName, NULL, NULL);

          free (pntinfo5) ;
     }
     else                                    // Windows NT
     {
          EnumPrinters (PRINTER_ENUM_LOCAL, NULL, 4, NULL,
                        0, &dwNeeded, &dwReturned) ;

          pntinfo4 = malloc (dwNeeded) ;

          EnumPrinters (PRINTER_ENUM_LOCAL, NULL, 4, (PBYTE) pntinfo4,
                        dwNeeded, &dwNeeded, &dwReturned) ;

          hdc = CreateDC (NULL, pntinfo4->pPrinterName, NULL, NULL) ;

          free (pntinfo4) ;
     }
     return hdc ;   
}