Title: Getting the Printer driver and port name from TPrinter's
Question: How can I get the Printer driver and port name from TPrinter's
GetPrinter() method?
Answer:
Sometimes, these parameters will return blank string. You can use
the Windows API function GetProfileString() to retrieve the associated
driver and port from the Windows.ini file.
Example:
uses Printers;
{$IFNDEF WIN32}
const MAX_PATH = 144;
{$ENDIF}
procedure TForm1.Button1Click(Sender: TObject);
var
pDevice : pChar;
pDriver : pChar;
pPort : pChar;
hDMode : THandle;
begin
if PrintDialog1.Execute then begin
GetMem(pDevice, cchDeviceName);
GetMem(pDriver, MAX_PATH);
GetMem(pPort, MAX_PATH);
Printer.GetPrinter(pDevice, pDriver, pPort, hDMode);
if lStrLen(pDriver) = 0 then begin
GetProfileString('Devices', pDevice, '', pDriver, MAX_PATH);
pDriver[pos(',', pDriver) - 1] := #0;
end;
if lStrLen(pPort) = 0 then begin
GetProfileString('Devices', pDevice, '', pPort, MAX_PATH);
lStrCpy(pPort, @pPort[lStrLen(pPort)+2]);
end;
Memo1.Lines.Add('Device := ' + StrPas(pDevice));
Memo1.Lines.Add('Driver := ' + StrPas(pDriver));
Memo1.Lines.Add('Port := ' + StrPas(pPort));
FreeMem(pDevice, cchDeviceName);
FreeMem(pDriver, MAX_PATH);
FreeMem(pPort, MAX_PATH);
end;
end;