Go Premium for a chance to win a PS4. Enter to Win

x
  • Status: Solved
  • Priority: Medium
  • Security: Public
  • Views: 270
  • Last Modified:

Printer problem with quick report.

Any one has any idea on how to solve the problem on quick report preview if there is no printer installed in local machine or remote machine.  I face such error that if there is no printer installed in my machine, and when the system comes to " QuickRep1.Preview ", the error appears!

Anyone please help.. I do not really find my answer at qusoft website.
0
ivylnm
Asked:
ivylnm
1 Solution
 
JaccoCommented:
Hi yvilnm,

Also when previewing QuickReport uses the printer object to create its preview.

You can check if a default printer is installed and not let your report form start. I extracted and altered some code from the printers unit.

Regards Jacco

uses
  WinSpool, Printers;

type
  TPrinterDevice = class
    Driver, Device, Port: String;
//    constructor Create(ADriver, ADevice, APort: PChar);
//    function IsEqual(ADriver, ADevice, APort: PChar): Boolean;
  end;

function SetToDefaultPrinter: Boolean;
var
  I: Integer;
  ByteCnt, StructCnt: DWORD;
  DefaultPrinter: array[0..79] of Char;
  Cur, Device: PChar;
  PrinterInfo: PPrinterInfo5;

  function FetchStr(var Str: PChar): PChar;
  var
    P: PChar;
  begin
    Result := Str;
    if Str = nil then Exit;
    P := Str;
    while P^ = ' ' do Inc(P);
    Result := P;
    while (P^ <> #0) and (P^ <> ',') do Inc(P);
    if P^ = ',' then
    begin
      P^ := #0;
      Inc(P);
    end;
    Str := P;
  end;

begin
  Result := True;
  ByteCnt := 0;
  StructCnt := 0;
  if not EnumPrinters(PRINTER_ENUM_DEFAULT, nil, 5, nil, 0, ByteCnt, StructCnt) and (GetLastError <> ERROR_INSUFFICIENT_BUFFER) then
  begin
    // With no printers installed, Win95/98 fails above with "Invalid filename".
    // NT succeeds and returns a StructCnt of zero.
    Result := False;
    Exit;
  end;
  PrinterInfo := AllocMem(ByteCnt);
  try
    EnumPrinters(PRINTER_ENUM_DEFAULT, nil, 5, PrinterInfo, ByteCnt, ByteCnt, StructCnt);
    if StructCnt > 0 then
      Device := PrinterInfo.pPrinterName
    else begin
      GetProfileString('windows', 'device', '', DefaultPrinter, SizeOf(DefaultPrinter) - 1);
      Cur := DefaultPrinter;
      Device := FetchStr(Cur);
    end;
    with Printer.Printers do
      for I := 0 to Count-1 do
      begin
        if TPrinterDevice(Objects[I]).Device = Device then
        begin
          Exit;
        end;
      end;
  finally
    FreeMem(PrinterInfo);
  end;
  Result := False;
end;

procedure TForm1.Button1Click(Sender: TObject);
begin
  if not SetToDefaultPrinter then
    Memo1.Lines.Add('no default printer found --> no quick report will run');
end;
0
 
ivylnmAuthor Commented:
Thanks! It really helps ya!
0

Featured Post

Free Tool: Site Down Detector

Helpful to verify reports of your own downtime, or to double check a downed website you are trying to access.

One of a set of tools we are providing to everyone as a way of saying thank you for being a part of the community.

Tackle projects and never again get stuck behind a technical roadblock.
Join Now