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cellspacing="1" cellpadding="1" bgcolor="#000000"><tr bgcolor="#FFFFFF"><td width="100%" colspan="4" align="left"><table width="95%" align="center"><tr><td class="font1"><p align="center"><br><font size="3">也谈为Delphi中数据库报表加网格</font><br><span class="nava"><font color="#CC9933">2000-06-09· -·中国计算机报社</font></span></p><p> 看了贵报第63期《为Delphi 3.0中数据库报表加上网格线》一文，笔者发现原文中的程序在不同分辨率的打印机（如180dpi的针式打印机和600dpi的激光打印机）上打印表格，效果会完全不同。如作者以针打作为他的输出打印机设计的程序，在激光打印机上输出，就会发现表格和文字错位，而且表格会打印得很小。而且原文中打印坐标的确定，必须靠反复的试验才能达到比较满意的效果。 </p> <p> 针对原目标，笔者设计了一段程序。首先在窗体上添加一个DBGrid来显示我们所要打印的数据，在这里，DBGrid不只是起到显示数据的作用，而且用户对DBGrid作的调整，例如改变了各字段的排列顺序，各字段的显示宽度等，都将直接反映到打印结果中去，也就是说，我们实际上就是要把DBGrid的内容直接输出到打印机。以下程序在Win 98+Delphi 4下编译通过，代码如下：</p> <blockquote> <p> procedure TForm1.Button2Click(Sender: TObject);<br> const<br> LeftBlank=1; //定义页边距，单位厘米<br> RightBlank=1;<br> TopBlank=1;<br> BottomBlank=1;<br> var<br> PointX,PointY:integer;<br> PointScale,PrintStep:integer;<br> s:string;<br> x,y:integer;<br> i:integer;<br> begin //获取当前打印机的分辨率<br> PointX:=Trunc(GetDeviceCaps(Printer.Handle,LOGPIXELSX)/2.54);<br> PointY:=Trunc(GetDeviceCaps(Printer.Handle,LOGPIXELSY)/2.54);<br> <br> //根据打印机和屏幕的分辨率计算出从屏幕转换到打印机的比例 <br> PointScale:=Trunc(GetDeviceCaps(Printer.Handle,LOGPIXELSX)<br> /Screen.PixelsPerInch+0.5); //横向打印<br> printer.Orientation:=poLandscape;<br> <br> //打印的字体和大小<br> printer.Canvas.Font.Name:=′宋体′;<br> printer.canvas.Font.Size:=10;<br> <br> //根据字体的大小确定每行的高度<br> s:=′漳州市刑警支队′;<br> PrintStep:=printer.canvas.TextHeight(s)+16;<br> <br> //打印的起点位置<br> x:=PointX*LeftBlank;<br> y:=PointY*TopBlank;<br> <br> //DataSource1是DBGrid1所连接的数据源<br> <br> if ((DataSource1.DataSet).Active=true) and ((DataSource1.DataSet).RecordCount〉0) then<br> begin<br> printer.BeginDoc;<br> (DataSource1.DataSet).First;<br> while not (DataSource1.DataSet).Eof do<br>⌨️ 快捷键说明
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