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  ±è¿µ´ë(2003-03-06 22:03:03, Hit : 5329, Vote : 1220
 ASCII printing

Jerry: >>This works fine on my system and on several others.  However, I am
getting some reports that some printers never get the output.  They may
or may not light up that they are receiving data, but they don't print.
<<

Then, it would seem you need the following code from Joe Hecht ?

    PhR

--------Joe C. Hecht --------------

Note that you have to include WinSpool in the uses clause.


procedure PrintFile(const sFileName: string);
const
  BufSize = 16384;
type
  TDoc_Info_1 = record
    pDocName: pChar;
    pOutputFile: pChar;
    pDataType: pChar;
  end;
var
  Count, BytesWritten: integer;
  hPrinter: THandle;
  Device : array[0..255] of char;
  Driver : array[0..255] of char;
  Port   : array[0..255] of char;
  hDeviceMode: THandle;
  DocInfo: TDoc_Info_1;
  f: file;
  Buffer: Pointer;
begin
  Printer.PrinterIndex := -1;
  Printer.GetPrinter(Device, Driver, Port, hDeviceMode);
  if not WinSpool.OpenPrinter(@Device, hPrinter, nil) then
    exit;
  DocInfo.pDocName := 'MyDocument';
  DocInfo.pOutputFile := nil;
  DocInfo.pDatatype := 'RAW';
  if StartDocPrinter(hPrinter, 1, @DocInfo) = 0 then
  begin
    WinSpool.ClosePrinter(hPrinter);
    exit;
  end;
  if not StartPagePrinter(hPrinter) then
  begin
    EndDocPrinter(hPrinter);
    WinSpool.ClosePrinter(hPrinter);
    exit;
  end;

  System.Assign(f, sFileName);
  try
    Reset(f, 1);
    GetMem(Buffer, BufSize);
    while not eof(f) do
    begin
      Blockread(f, Buffer^, BufSize, Count);
      if Count > 0 then
      begin
        if not WritePrinter(hPrinter, Buffer, Count, BytesWritten) then
        begin
          EndPagePrinter(hPrinter);
          EndDocPrinter(hPrinter);
          WinSpool.ClosePrinter(hPrinter);
          FreeMem(Buffer, BufSize);
          exit;
        end;
      end;
    end;
    FreeMem(Buffer, BufSize);
    EndDocPrinter(hPrinter);
    WinSpool.ClosePrinter(hPrinter);
  finally
    System.Closefile(f);
  end;
end;

*************************************
procedure WriteRawStringToPrinter(PrinterName: String; S: String);
var
  Handle: THandle;
  N: DWORD;
  DocInfo1: TDocInfo1;
begin
  if not OpenPrinter(PChar(PrinterName), Handle, nil) then
  begin
    ShowMessage('error ' + IntToStr(GetLastError));
    Exit;
  end;

  with DocInfo do
  begin
    pDocName := PChar('test doc');
    pOutputFile := nil;
    pDataType := 'RAW';
  end;

  StartDocPrinter(Handle, 1, ocInfo);
  StartPagePrinter(Handle);
  WritePrinter(Handle, PChar(S), Length(S), N);
  EndPagePrinter(Handle);
  EndDocPrinter(Handle);
  ClosePrinter(Handle);
end;

The PrinterName parameter must be the name of the printer as it is
installed. For example, if the name of the printer
is "HP LaserJet 5MP" then that is what you should pass.





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