IN_BUFFER);
// 修改DevMode 结构。
{ 下面的代码是为了测试打印机
是否按A4 纸大小来打印}
PrnHdc := CreateDC
( nil, 'Epson LQ -1600K',nil,DevMode );
GetMem( DocInfo, 100 );
With DocInfo^ do begin
cbSize := sizeof(DocInfo);
lpszDocName := nil;
lpszOutput := nil;
lpszDatatype := nil;
fwType := DI_APPBANDING;
end;
StartDoc( PrnHdc, DocInfo^);
StartPage(
PrnHdc);
TextOut( PrnHdc, 10, 10, 'Hello My Friend!',17);
EndPage(PrnHdc);
EndDoc(PrnHdc);
DeleteDC(PrnHdc);
FreeMem(DocInfo);
FreeMem(PrnInfo);
FreeMem(DevMode);
end;
Procedure TForm1.Button2Click(Sender: TObject);
var
PrnHd:THandle;
PrnInfo : PPrinterInfo1;
pcbNeeded : DWORD;
PDevModeBytes : DWORD;
DevMode: PDeviceMode;
PrnHdc : HDC;
DocInfo : PDocInfo;
begin
OpenPrinter('Epson LQ -1600K',PrnHd,nil);
// 获得打印机句柄PrnHd
GetMem(PrnInfo,1024);
GetPrinter(PrnHd,1,PrnInfo,1024,@pcbNeeded);
PDevModeBytes:= DocumentProperties
( Handle,PrnHd,prninfo^.
pDescription,DevMode^,DevMode^,0 );
{获取DevMode 结构所需的字节数}
GetMem(DevMode,PDevModeBytes);
// 给结构DevMode 分配空间
DocumentProperties(