EnumPrinters用法

看API描述，不怎么理解，还是在网上找到用法，记载一下：

          1: DWORD dwNeeded = 0, dwNum = 0;

         2: EnumPrinters(PRINTER_ENUM_LOCAL, NULL, 4, NULL, 0, &dwNeeded, &dwNum);

         3: BYTE* pBuffer = new BYTE[dwNeeded];

         4: EnumPrinters(PRINTER_ENUM_LOCAL, NULL, 4, pBuffer, dwNeeded, &dwNeeded, &dwNum);

         5: if(dwNum !=0 ) {

         6:     PRINTER_INFO_4* pPrnInfo = (PRINTER_INFO_4*) buffer;

         7:     for(int i=0; i<dwNum; i++) {

         8:         MessageBox(pPrnInfo->pPrinterName);

         9:         pPrnInfo++;

        10:     }

        11: }

        12: delete[] pBuffer;