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在天极网上发布的各类delphi原码及技巧文档

//Add Action into user right cds.<br>
<br>
&nbsp;&nbsp;　with frmMain do begin<br>
<br>
&nbsp;&nbsp;&nbsp;&nbsp;　for i:=0 to ActionList1.actioncount-1 do begin<br>
<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;　Action:=ActionList1.Actions[i];<br>
<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;cdsUserRight.AppendRecord([cdsUser.FieldByName(’userName’).AsString,TAction(Action).Caption,TAction(Action).Enabled,i]);<br>
<br>
&nbsp;&nbsp;&nbsp;&nbsp;end;<br>
<br>
&nbsp;&nbsp;end;<br>
<br>
end;<br>
<br>
　　在这段代码中，用到了TActionList的两个属性，一个是ActionCount,另一个是Actions。ActionCount表示TactionList中有多少功能，即Action,Actions是一个数组属性，通过索引可能访问每一个TAction,从而可以设置其具体的属性，象上面提到的Enable及Visible，从而达到限制的目的，通过这段代码，将应用程序的所有功能都加入了UserRight表中。<br>
<br>
第三步，可以用Grid对上一步产生的表进行编辑操作<br>
<br>
第四步，利用第二、三步产生的功能限制表UserRight，限制用户的权限，这可以在应用程序的主窗体的OnCreate 中实现。<br>
<br>
procedure TfrmMain.FormCreate(Sender: TObject);<br>
<br>
const<br>
<br>
&nbsp;&nbsp;　testUser=’yh’;<br>
<br>
var<br>
<br>
&nbsp;&nbsp;　cdsRight:TClientDataSet;<br>
<br>
&nbsp;&nbsp;　i:Integer;<br>
<br>
begin<br>
<br>
&nbsp;&nbsp;//set right of function<br>
<br>
&nbsp;&nbsp;　cdsRight:=TClientDataSet.Create(self);<br>
<br>
&nbsp;&nbsp;　try<br>
<br>
&nbsp;&nbsp;　cdsRight.LoadFromFile(’Right.CDS’);<br>
<br>
&nbsp;&nbsp;　cdsRight.AddIndex(’id’,’UserName;ActionCaption’,[],’’,’’,0);<br>
<br>
&nbsp;&nbsp;　cdsRight.IndexName:=’id’;<br>
<br>
&nbsp;&nbsp;for i:=0 to ActionList1.ActionCount-1 do begin<br>
<br>
&nbsp;&nbsp;&nbsp;&nbsp;　if cdsRight.FindKey([TestUser,TAction(ActionList1.Actions[i]).Caption]) 
then<br>
<br>
&nbsp;&nbsp;&nbsp;&nbsp;　TAction(ActionList1.Actions[i]).Enabled:=cdsRight.FieldByName(’ActionEnable’).AsBoolean;<br>
<br>
&nbsp;&nbsp;　end;<br>
<br>
&nbsp;&nbsp;　finally<br>
<br>
&nbsp;&nbsp;&nbsp;&nbsp;　cdsRight.Close;<br>
<br>
&nbsp;&nbsp;&nbsp;&nbsp;　cdsRight.Free;<br>
<br>
&nbsp;&nbsp;end;<br>
<br>
end;<br>
<br>
　　这段代码中，假设当前的用户ID为yh,同时只设定了功能的Enable属性。<br>
<br>
　　最后，笔者为了演示功能权限的设定功能，制作了demo程序，感兴趣者可以向作者索取。在demo程序中，同时还使用了内存表ClientDataSet的使用方法，不用BDE建立瘦数据库应用程序。</p>
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