打印时如何只打印表单中的DbGrid和Panel，而其它控件不打印呢？难啊。

Question

在表单中有SpeedButton,treeview,DbGrid,Panel。但是我想点打印时只打印DbGrid，如何实现？只打印Panel又该如何实现呢？高手请进。

Answer 1

好象不能单独打印DbGrid，除非把它单独放在一表单中。

Answer 2

procedure TForm1.Button2Click(Sender: TObject);
var
  pl,pr,pt,pb:integer;//页边距
  px,py:integer;//打印机分辨率
  ps:integer;//打印机与显示器分辨率之比
  lh:integer;//行高
  i:integer;
  x,y:integer;//打印坐标
  rowb,colb:integer; //行距、行距
begin
  //初始化页面
  pl:=spinedit1.Value;
  pr:=spinedit2.Value;
  pt:=spinedit3.Value;
  pb:=spinedit4.Value;
  rowb:=spinedit6.Value;//行距
  colb:=spinedit7.Value;//列距
  //将获得的打印机分辨率由厘米转换为英寸
  px:=Trunc(GetDeviceCaps(Printer.Handle,LOGPIXELSX)/2.54);
  py:=Trunc(GetDeviceCaps(Printer.Handle,LOGPIXELSY)/2.54);
  //将屏幕分辨率转换为打印机的比例　
  ps:=Trunc(GetDeviceCaps(Printer.Handle,LOGPIXELSX)
  /Screen.PixelsPerInch);
  //设置打印方向
  if combobox1.Text='横向打印' then
    printer.Orientation:=poPortrait;
  else
    printer.Orientation:=poLandscape;
  //获得打印的字体和大小
  printer.Canvas.Font.Name:=combobox2.Text;
  printer.canvas.Font.Size:=spinedit5.Value;
  printer.canvas.Font.Color:=clred;
  printer.Canvas.Pen.Color:=clblue;
  //设置行高
  lh:=printer.canvas.textheight(dbgrid1.Font.Name);
  //打印的起始位置(打印机画布上的位置)
  x:=PX*pl;
  y:=PY*pt;
  //打印DBGrid1中的内容
  if (table1.Active=true) and (table1.RecordCount>0) then
    begin
      //设置一打印机任务标题
      printer.Title:='DBGrid内容打印';
      with printer do
      begin
        BeginDoc;
        table1.First;
        while not table1.Eof do
          begin
            for i:=0 to DBGrid1.FieldCount-1 do
              begin
              //设定打印的宽度
                if (x+DBGrid1.Columns.Items[i].Width*ps)
                   <=(PageWidth-ps*pr) then
                  begin
                    //画出表格线
                    Printer.Canvas.Rectangle(x,y,x+dbgrid1.Columns.Items[i].Width*ps,y+lh);
                    //如果为第一行时，打印DBGrid1确的标题
                    if y=PY*pt then
                      Canvas.TextOut(x+rowb,y+colb,
                      DBGrid1.Columns[i].Title.Caption)
                    else
                    //其它行，打印每行的内容
                      Printer.Canvas.TextOut(x+rowb,y+colb,
                      DBGrid1.Fields[i].asString);
                  end;
                   //下一列的横坐标，下一列的纵坐标不变
                 x:=x+dbgrid1.Columns.Items[i].Width*ps;
                end;
                //打印下一记录
                if not (y=py*pt) then
                 table1.next;
                  x:=px*pl; //打印下一行时，横坐标回到行首
                  y:=y+lh;
               //打印满一页时,新建一页
               if (y+lh)>(PageHeight-py*pb) then
                 begin
                   NewPage;
                   x:=px*pl;
                   y:=py*pt;
                 end;
              end;
        EndDoc;
      end;
      table1.First;//回到DBGrid1首行
      Application.MessageBox('已打印完成','打印',32);
   end;
end;procedure TForm1.FormActivate(Sender: TObject);
begin
//获得打印可选字体,并设置初始字体为DBGrid1的字体,字号
combobox2.Items:=printer.Fonts;
combobox2.Text:=dbgrid1.Font.Name;
spinedit5.value:=dbgrid1.Font.Size;
table1.DatabaseName:=ExtractFilePath(Application.ExeName);
table1.open;
end;
end.
从这源码就可以学到如何只打印dbgrid中的数据了