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 <p> 　　注意：我在这里用了Teacher.dbf，那是反映教职工的性别，只能是“男”或者是“女”。 </p>
 <p> 　　4、 DrawDataCell事件是绘制单元格，当获得焦点网格所对应的字段与组合框所对应的字段一致时，移动组合框到获得焦点的网格上，并且<br>
 使组合框可视，从而达到在DBGrid指定列上显示DBComboBox的功能。设置DBGrid1的OnDrawDataCell事件如下： 
 </p>
 <blockquote> 
 <p><br>
 procedure TForm1.DBGrid1DrawDataCell(Sender: TObject; const 
 Rect: TRect; Field: TField; State: TGridDrawState);<br>
 begin<br>
 if (gdFocused in State) then<br>
 begin<br>
 if (Field.FieldName 
 = DBComboBox1.DataField ) then<br>
 begin<br>
 
 DBComboBox1.Left := Rect.Left + DBGrid1.Left;<br>
 
 DBComboBox1.Top := Rect.Top + DBGrid1.top;<br>
 
 DBComboBox1.Width := Rect.Right - Rect.Left;<br>
 
 DBComboBox1.Height := Rect.Bottom - Rect.Top;<br>
 
 DBComboBox1.Visible := True;<br>
 end;<br>
 end;<br>
 end;</p>
 </blockquote>
 <p> 　　5、 DBGrid指定单元格未获得焦点时不显示DBComboBox，设置DBGrid1的OnColExit事件如下： 
 </p>
 <blockquote> 
 <p> procedure TForm1.DBGrid1ColExit(Sender: TObject);<br>
 begin<br>
 If DBGrid1.SelectedField.FieldName 
 = DBComboBox1.DataField then<br>
 begin<br>
 DBComboBox1.Visible 
 := false;<br>
 end;<br>
 end;</p>
 </blockquote>
 <p> 　　6、 当DBGrid指定列获得焦点时DrawDataCell事件只是绘制单元格，并显示DBComboBox，但是DBComboBox并没有获得焦点，数据的输入还是在单元格上进行。在DBGrid1的KeyPress事件中调用SendMessage这个 
 Windows API函数将数据输入传输到DBComboBox上，从而达到在DBComboBox上进行数据输入。因此还要设置KeyPress事件如下： 
 </p>
 <blockquote>
 <p> procedure TForm1.DBGrid1KeyPress(Sender: TObject; var Key: 
 Char);<br>
 begin<br>
 if (key &#60; &#62; chr(9)) then<br>
 begin<br>
 if (DBGrid1.SelectedField.FieldName 
 =DBComboBox1.DataField) then<br>
 begin<br>
 
 DBComboBox1.SetFocus;<br>
 
 SendMessage(DBComboBox1.Handle, WM_Char, word(Key), 0);<br>
 end;<br>
 end;<br>
 end;</p>
 </blockquote>
 <p> 　　程序在中文Windows 98，Delphi 4.015 下调试通过。希望本文能使你可以更加方便快捷的开发数据库应用程序。</p>
 


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