delphi - 直接向打印机发送命令的正确方法!

Question

好的，我是这样做的:

procedure TMainWindow.btnRawPrintClick(Sender: TObject);
begin
  BeginPrint;
  SendStr(#27#69);
  SendStr('MyData');
  SendStr(#10);
  EndPrint;
end;

procedure TMainWindow.SendStr(Text: String);
var
  i: Integer;
  data : Array of Char;
begin
  for i := 1 to Length(Text) do
  begin
    SetLength(data,i);
    data[Pred(i)] := Text[i];
  end;

  if (PrintRawData(printHandle,
                   data,
                   Length(data)) < 0) then begin
    ShowMessage('PrintRawData Failed');
    EndRawPrintPage(printHandle);
    EndRawPrintJob(printHandle);
    exit;
  end;
end;

procedure TMainWindow.BeginPrint;
begin
  printHandle := StartRawPrintJob('EPSON TM-T70 Receipt','ESDPRT001','Test Document');

  if printHandle < 0 then
  begin
    ShowMessage('StartRawPrintJob Failed!');
    exit;
  end;

  if (StartRawPrintPage(printHandle) < 0) then begin
    ShowMessage('StartRawPrintPage Failed!');
    EndRawPrintJob(printHandle);
    exit;
  end;
end;

procedure TMainWindow.EndPrint;
begin
  if (EndRawPrintPage(printHandle) < 0) then begin
    ShowMessage('EndRawPrintPage Failed');
    EndRawPrintJob(printHandle);
    exit;
  end;

  if (EndRawPrintJob(printHandle) < 0) then begin
    ShowMessage('EndRawPrintJob Failed');
    exit;
  end;
end;

我还更改了从 here 获取的一些代码:

function PrintRawData(hPrn : THandle;
                      Buffer : pointer;
                      NumBytes : SpoolInt) : integer;
{$IFDEF WIN32}
var
  BytesWritten : DWORD;
 {$ENDIF}
begin
  NumBytes := NumBytes * 2;    //<-- I added this line
  ...

但是，有些问题是错误的，因为某些命令(转义序列)无法按预期工作!

Answer 1

您使用了错误的函数。使用Escape ，传递 PASSTHROUGH 标志作为第二个参数。这会将原始的、未处理的转义码直接发送到打印机。

Joe Hecht(前 Borland)多次发布了一个单元，这使得这变得更容易。我发现unit PrtRaw在这里。