Mega Code Archive
Check if a printer supports postscript
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Title: Check if a printer supports postscript?
{
That is really difficult do to if it has to work on all Windows
platforms. The best way (no kidding) may be to ask the user which
printer to use. What platforms do you need to support? If it is only
Win2K (and perhaps XP) one may be able to use this (i have no
postscript-enabled printer around to see if it works!):
}
uses
WinSpool, Printers;
{: Check if the currently selected printer supports postscript.
Only applicable on Win2K/XP! }
function PrinterSupportsPostscript: Boolean;
const
POSTSCRIPT_PASSTHROUGH = 4115;
POSTSCRIPT_IDENTIFY = 4117;
Escapes: array[0..2] of Cardinal =
(POSTSCRIPT_DATA, POSTSCRIPT_IDENTIFY, POSTSCRIPT_PASSTHROUGH);
var
res: Integer;
i: Integer;
begin
Result := false;
for i := Low(Escapes) to High(Escapes) do begin
res := ExtEscape(printer.Handle,
QUERYESCSUPPORT,
sizeof(Escapes[0]),
@Escapes[i], 0, nil);
if res 0 then begin
Result := true;
Break;
end;
end;
end;
procedure TForm1.Button1Click(Sender: TObject);
const
boolstr: array[Boolean] of string = (' not', '');
var
i: Integer;
S: string;
begin
for i := 0 to Printer.Printers.Count - 1 do begin
Printer.PrinterIndex := i;
memo1.Lines.add(
Format('Printer %s does%s support Postscript',
[printer.printers[printer.printerindex],
boolstr[PrinterSupportsPostscript]]));
end;
end;
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