如何在 FOR ... TO ... DO 中等待 TWebBrowser 加载？

Question

我有这个代码：

    for i:=0 to Memo1.Lines.Count-1 do
       begin
           while WebBrowser1.Busy do Application.ProcessMessages;
           WebBrowser1.OleObject.Document.Links.item(cat[i]).click;
           subcatList;
       end;

但是 WebBrowser1 运行了几次，尽管程序的期望值。如何不在后台启动 WebBrowser1 或者解决方案是什么？

Answer 1

需要实现TWebBrowser、BeforeNavigate2、DocumentComplete、NavigateComplete2这3个事件

    TForm1 = class(TForm)
    private
      CurDispatch: IDispatch; 
      FDocLoaded: Boolean;    
    ....


    procedure TForm1.WebBrowser1BeforeNavigate2(ASender: TObject; const pDisp: IDispatch;
      const URL, Flags, TargetFrameName, PostData, Headers: OleVariant;
      var Cancel: WordBool);
    begin
      CurDispatch := nil;
      FDocLoaded := False;
    end;

    procedure TForm1.WebBrowser1DocumentComplete(ASender: TObject; const pDisp: IDispatch;
      const URL: OleVariant);
    begin
      if (pDisp = CurDispatch) then  
      begin
        FDocLoaded := True;
        CurDispatch := nil;
      end;
    end;

    procedure TForm1.WebBrowser1NavigateComplete2(ASender: TObject; const pDisp: IDispatch;
      const URL: OleVariant);
    begin
      if CurDispatch = nil then
        CurDispatch := pDisp;
    end;

现在您可以使用 FDocLoaded 变量来了解页面是否已加载到 WebBrowser

    WebBrowser1.Navigate('www.stackoverflow.com');
    repeat Application.ProcessMessage until FDocLoaded;

问候