事件没有被解雇

Event is not getting fired

我正在尝试使用 TWebbrowser 中的 WebWorkerStartedWebWorkerFinished,但是这些事件根本没有被触发。

我怎样才能使这些活动正常进行?我想查看从 TWebbrowser.

启动了哪些工作线程
unit Unit2;

interface

uses
  Winapi.Windows, Winapi.Messages, System.SysUtils, System.Variants, System.Classes, Vcl.Graphics,
  Vcl.Controls, Vcl.Forms, Vcl.Dialogs, Vcl.StdCtrls, Vcl.OleCtrls, SHDocVw;

type
  TForm2 = class(TForm)
    WebBrowser1: TWebBrowser;
    Button1: TButton;
    procedure Button1Click(Sender: TObject);
    procedure WebBrowser1WebWorkerFinsihed(ASender: TObject; dwUniqueID: Cardinal);
    procedure WebBrowser1WebWorkerStarted(ASender: TObject; dwUniqueID: Cardinal; const bstrWorkerLabel: WideString);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form2: TForm2;

implementation

{$R *.dfm}

procedure TForm2.Button1Click(Sender: TObject);
begin
  WebBrowser1.Navigate('www.whosebug.com');
end;

procedure TForm2.WebBrowser1WebWorkerFinsihed(ASender: TObject; dwUniqueID: Cardinal);
begin
  // does not fire
end;

procedure TForm2.WebBrowser1WebWorkerStarted(ASender: TObject; dwUniqueID: Cardinal; const bstrWorkerLabel: WideString);
begin
  // does not fire
end;

end.

如文档所述here :

By default, TWebBrowser uses IE7 Standards mode even if the run-time environment installed the latest IE (for example, IE11).

WebWorkers 是在 IE10 中引入的,因此您必须在更新的模式下安装 IE 运行ning。至少需要设置两个注册表项(如果同时支持 32/64 位则更多):

HKEY_LOCAL_MACHINE (or HKEY_CURRENT_USER) 
  {\Wow6432Node}
  \SOFTWARE
  \Microsoft 
  \Internet Explorer
  \Main
  \FeatureControl
  \FEATURE_BEHAVIORS
     {NEW DWORD ->  'YourApplication.exe'
     {    VALUE -> 1  

还有(比如IE11模式)

  HKEY_LOCAL_MACHINE (or HKEY_CURRENT_USER) 
  {\Wow6432Node}
  \SOFTWARE
  \Microsoft 
  \Internet Explorer
  \Main
  \FeatureControl
  \FEATURE_BROWSER_EMULATION
     {NEW DWORD ->  'YourApplication.exe'
     {    VALUE ->  0x2AF8 

这将导致由 TWebBrowser 包装的 Internet Explorer 实例在 IE11 模式下 运行,支持 WebWorkers 等。在设置此值之前,您可能应该对已安装的 IE 版本进行某种完整性检查。有关有效条目的更多信息 can be found on MSDN.

导航到 Whosebug 时,这仍然不会为我引发任何 WebWorker 事件(您确定它使用它们吗?)。作为验证测试​​,此 WebWorkers 演示页面确实引发了 OnWebWorkerStarted 事件:

WebBrowser1.Navigate('https://whatwg.org/demos/workers/primes/page.html');