delphi – 检测RichEdit中的点击URL

发布时间：2020-12-15 10:12:17 所属栏目：大数据来源：网络整理

导读：我正在尝试更新RichEdit,以便它检测URL并允许单击它以在浏览器中打开.检测URL很简单,我只使用 http://www.scalabium.com/faq/dct0146.htm中的以下代码 mask := SendMessage(MNote.Handle,EM_GETEVENTMASK,0); SendMessage(MNote.Handle,EM_SETEVENTMASK,mask

我正在尝试更新RichEdit,以便它检测URL并允许单击它以在浏览器中打开.检测URL很简单,我只使用 http://www.scalabium.com/faq/dct0146.htm中的以下代码

mask := SendMessage(MNote.Handle,EM_GETEVENTMASK,0);
  SendMessage(MNote.Handle,EM_SETEVENTMASK,mask or ENM_LINK);
  SendMessage(MNote.Handle,EM_AUTOURLDETECT,Integer(True),0);

但第二部分对我不起作用.他们提供以下代码来捕获EN_LINK消息并对其进行处理：

type
  TForm1 = class(TForm)
  protected
    procedure WndProc(var Message: TMessage); override;
  end;
...

procedure TForm1.WndProc(var Message: TMessage);
var
  p: TENLink;
  strURL: string;
begin
  if (Message.Msg = WM_NOTIFY) then
  begin
    if (PNMHDR(Message.LParam).code = EN_LINK) then
    begin
      p := TENLink(Pointer(TWMNotify(Message).NMHdr)^);
      if (p.msg = WM_LBUTTONDOWN) then
      begin
        SendMessage(RichEdit1.Handle,EM_EXSETSEL,LongInt(@(p.chrg)));
        strURL := RichEdit1.SelText;
        ShellExecute(Handle,'open',PChar(strURL),SW_SHOWNORMAL);
      end
    end
  end;

  inherited;
end;

当我运行程序时,检测到URL,但点击它不会做任何事情.使用调试我发现当我点击URL时,Message.Msg = WM_NOTIFY不成立.然后我试图覆盖TRichEdit的WndProc,但结果是一样的.有什么建议么？

解决方法

对RichEdit的WindowProc属性进行子类化并查找CN_NOTIFY消息,例如：

type
  TForm1 = class(TForm)
    RichEdit1: TRichEdit;
    procedure FormCreate(Sender: TObject);
  private
    PrevRichEditWndProc: TWndMethod;
    procedure RichEditWndProc(var Message: TMessage);
    procedure SetRichEditMasks;
  end; 

procedure TForm1.FormCreate(Sender: TObject);
begin
  PrevRichEditWndProc := RichEdit1.WindowProc;
  RichEdit1.WindowProc := RichEditWndProc;
  SetRichEditMasks;
end;

procedure TForm1.SetRichEditMasks;
var
  mask: Longint;
begin
  mask := SendMessage(RichEdit1.Handle,0); 
  SendMessage(RichEdit1.Handle,mask or ENM_LINK); 
  SendMessage(RichEdit1.Handle,1,0);  
end;

procedure TForm1.RichEditWndProc(var Message: TMessage); 
begin 
  PrevRichEditWndProc(Message);
  case Message.Msg of
    CN_NOTIFY:
      begin
        if (TWMNotify(Message).NMHdr^.code = EN_LINK) then
        begin
          with PENLink(Message.LParam)^ do
          begin
            if (msg = WM_LBUTTONDOWN) then
            begin 
              SendMessage(RichEdit1.Handle,LongInt(@chrg)); 
              ShellExecute(Handle,PChar(RichEdit1.SelText),SW_SHOWNORMAL); 
            end;
          end;
        end;
      end;
    CM_RECREATEWND:
      begin
        SetRichEditMasks;
      end;
  end; 
end;

（编辑：李大同）

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