Question

printer selected is not valid ？？？在线等

Answer 1

法度榜样启动今后，当接收完文件今后主动打印。然后从新设置打印机。如不雅在接收完文件打印的时刻在begindoc会报printer selected is not valid。谁能告诉我为什么呢？ end;function TPrintThread.PrinteTif: Boolean;var Enview: TimageEnmview; i: Integer;begin ResetEvent(AEvent); for i := 0 to Printer.Printers.Count - 1 do begin if Printer.Printers.strings[i] = fPrintName then begin Printer.printerindex := i; break; end; Enview := TimageEnmview.Create(nil); Enview.MIO.LoadFromFile(DocName); with Printer do Terminate; begin for i := 0 to Enview.ImageCount - 1 do BeginDoc;///这里报错。 begin DrawImage(Canvas, Rect(0, 0, pagewidth, pageheight), Enview.GetBitmap(i)); if i < Enview.ImageCount - 1 then Printer.NewPage; end; EndDoc; end; SetEvent(AEvent); Enview.free;end; 查看更多答案>>