DBGrid使用全书(二)

打印 TDBGrid内容----方法1
procedure PrintDbGrid(DataSet:TDataSet;DbGrid:TDbGrid;Title:String);
var
PointX,PointY:integer;
 ScreenX:integer;
 i,lx,ly:integer;
 px1,py1,px2,py2:integer;
 RowPerPage,RowPrinted:integer;
 ScaleX:Real;
 THeight:integer;
 TitleWidth:integer;
 SumWidth:integer;
 PageCount:integer;
 SpaceX,SpaceY:integer;
 RowCount:integer;
begin
PointX:=Round(GetDeviceCaps(printer.Handle,LOGPIXELSX)/2.54);
PointY:=Round(GetDeviceCaps(printer.Handle,LOGPIXELSY)/2.54);
 ScreenX:=Round(Screen.PixelsPerInch/2.54);
ScaleX:=PointX/ScreenX;
 RowPrinted:=0;
 SumWidth:=0;
 printer.BeginDoc;
 With Printer.Canvas do
 begin
  DataSet.DisableControls;
   DataSet.First ;
   THeight:=Round(TextHeight('我')*1.5);//设定每行高度为字符高的1.5倍
   SpaceY:= Round(TextHeight('我')/4);
   SpaceX:=Round(TextWidth('我')/4);
   RowPerpage:=Round((printer.PageHeight-5*PointY)/THeight); //上下边缘各2厘米
   ly:=2*PointY;
   PageCount:=0;
  while not DataSet.Eof do
   begin
    if (RowPrinted=RowPerPage) or (RowPrinted=0) then
     begin
      if RowPrinted<>0 then
      Printer.NewPage;
       RowPrinted:=0;
       PageCount:=PageCount+1;
       Font.Name:='宋体';
       Font.size:=16;
       Font.Style:=Font.Style+[fsBold];
       lx:=Round((Printer.PageWidth-TextWidth(Title))/2);
       ly:=2*PointY;
       TextOut(lx,ly,Title);
       Font.Size:=11;
       Font.Style:=Font.Style-[fsBold];
       lx:=Printer.PageWidth-5*PointX;
       ly:=Round(2*PointY+0.2*PointY);
       if RowPerPage*PageCount>DataSet.RecordCount then
        RowCount:=DataSet.RecordCount
       else
       RowCount:=RowPerPage*PageCount;
       TextOut(lx,ly,'第'+IntToStr(RowPerPage*(PageCount-1)+1)+'-'+IntToStr(RowCount)+'条，共'+IntToStr(DataSet.RecordCount)+'条');
       lx:=2*PointX;
       ly:=ly+THeight*2;
       py1:=ly-SpaceY;
       if RowCount=DataSet.RecordCount then
        py2:=py1+THeight*(RowCount-RowPerPage*(PageCount-1)+1)
       else
        py2:=py1+THeight*(RowPerPage+1);
       SumWidth:=lx;
       for i:=0 to DBGrid.Columns.Count-1 do
       begin
       px1:=SumWidth-SpaceX;
         px2:=SumWidth;
         MoveTo(px1,py1);
         LineTo(px2,py2);
         TitleWidth:=TextWidth(DBGrid.Columns[i].Title.Caption);
         lx:=Round(SumWidth+(DBGrid.Columns[i].width*scaleX-titleWidth)/2);
         TextOut(lx,ly,DBGrid.Columns[i].Title.Caption);
         SumWidth:=Round(SumWidth+DBGrid.Columns[i].width*scaleX)+SpaceX*2;
       end;
       px1:=SumWidth;      //画最后一条竖线
       px2:=SumWidth;
       MoveTo(px1,py1);
       LineTo(px2,py2);
       px1:=2*PointX;            //画第一条横线
     px2:=SumWidth;
      py1:=ly-SpaceY;
      py2:=ly-SpaceY;
       MoveTo(px1,py1);
       LineTo(px2,py2);
       py1:=py1+THeight;
       py2:=py2+THeight;
       MoveTo(px1,py1);
       LineTo(px2,py2);
     end;
   lx:=2*PointX;
     ly:=ly+THeight;
     px1:=lx;
     px2:=SumWidth;
     py1:=ly-SpaceY+THeight;
     py2:=ly-SpaceY+THeight;
     MoveTo(px1,py1);
     LineTo(px2,py2);
     for i:=0 to DBGrid.Columns.Count-1 do
     begin
       TextOut(lx,ly,DataSet.FieldByname(DBGrid.Columns[i].Fieldname).AsString);
       lx:=Round(lx+DBGrid.Columns[i].width*ScaleX+SpaceX*2);
     end;
     RowPrinted:=RowPrinted+1;
     DataSet.next;
   end;
   DataSet.first;
   DataSet.EnableControls;
 end;
 printer.EndDoc;
end;

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