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[Delphi文章] 利用Delphi编写IE扩展 





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就是如何使IE扩展组件可以响应事件。
    在自己的程序中使用过WebBrowser控件的朋友都知道,WebBrowser控件定义了诸如BeforeNavigate、DownloadComplete 等事件,我们可以通过编写事件处理代码实现对WebBrowser控件的操作。那么如何实现对IE的事件响应和处理呢?同建立


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IE面板一样。我们需要建立一个实现IObjectWithSite接口的COM组件,不同的是,我们还需要实现IDispatch接口,在IObjectWithSite接口的SetSite方法中获得IE的WebBrowser接口并建立自身与WebBrowser的连接,然后如果在IE的Webbrowser对象中发生什么事件的话,那么IE就会回调连接的IDispatch接口的Invoke方法。我们通过在Invoke方法中编写代码就可以获得IE事件了。这个利用的是COM编程的回调接口原理。
    下面我们首先来实现代码。点击Delphi菜单 File | New 。在 ActiveX 页面中选择Active Library ,然后点击 OK 按钮。然后用同样的方法建立一个COM Object。在COM Object Wizard 窗口中,将复选框 Included type library 去掉。然后在Class Name中输入IEHelper,在Implemented Interface 中输入:IDispatch;IObjectwithSite 。然后点击 OK 按钮建立一个COM组件。
    保存工程,将工程保存为IEHelper.dpr,将Unit1保存为IEHelperUnit.pas。下面是IEHelperUnit.pas的具体代码:

 

unit iehelperunit;

interface

uses
WIndows, Comobj, ActiveX, SHDOCVW, MSHTML,Dialogs;


type

  TIEHelperFactory = class(TComObjectFactory)
  private
    procedure AddKeys;
    procedure RemoveKeys;
  public
    procedure UpdateRegistry(Register: Boolean); override;
  end;


  TIEHelper = class(TComObject, IDispatch, IObjectWithSite)
  public
    function GetTypeInfoCount(out Count: Integer): HResult; stdcall;
    function GetTypeInfo(Index, LocaleID: Integer; out TypeInfo): HResult; stdcall;
    function GetIDsOfNames(const IID: TGUID; Names: Pointer;
      NameCount, LocaleID: Integer; DispIDs: Pointer): HResult; stdcall;
    function Invoke(DispID: Integer; const IID: TGUID; LocaleID: Integer;
      Flags: Word; var Params; VarResult, ExcepInfo, ArgErr: Pointer): HResult; stdcall;
    function SetSite(const pUnkSite: IUnknown): HResult; stdcall;
    function GetSite(const riid: TIID; out site: IUnknown): HResult; stdcall;
  private
    IE: IWebbrowser2;
    Cookie: Integer;
  end;

const
  Class_IEHelper: TGUID = "{3D898C55-74CC-4B7C-B5F1-45913F368388}";


implementation

uses ComServ, Registry, SysUtils;


procedure DoStatusTextChange(const Text: WideString);
begin

end;

procedure DoProgressChange(Progress: Integer; ProgressMax: Integer);
begin

end;

procedure DoCommandStateChange(Command: Integer; Enable: WordBool);
begin

end;

procedure DoDownloadBegin;
begin

end;

procedure DoDownloadComplete;
begin

end;

procedure DoTitleChange(const Text: WideString);
begin

end;

procedure DoPropertyChange(const szProperty: WideString);
begin

end;

procedure DoBeforeNavigate2(const pDisp: IDispatch; var URL: OleVariant; var Flags: OleVariant; var TargetFrameName: OleVariant; var PostData: OleVariant; var Headers: OleVariant; var Cancel: WordBool);
begin
  if URL<>"http://www.applevb.com/"then begin
    Showmessage("你不可以浏览其它站点");
    Cancel:=True;
   
URL:="http://www.applevb.com";
    (pDisp as IWebbrowser2).Navigate2(URL,Flags,TargetFrameName,PostData,Headers);
  end;
end;

procedure DoNewWindow2(var ppDisp: IDispatch; var Cancel: WordBool);
begin

end;

procedure DoNavigateComplete2(const pDisp: IDispatch; var URL: OleVariant);
begin

end;

procedure DoDocumentComplete(const pDisp: IDispatch; var URL: OleVariant);
begin

end;

procedure DoOnQuit;
begin

end;

procedure DoOnVisible(Visible: WordBool);
begin

end;

procedure DoOnToolBar(ToolBar: WordBool);
begin

end;

procedure DoOnMenuBar(MenuBar: WordBool);
begin

end;

procedure DoOnStatusBar(StatusBar: WordBool);
begin

end;

procedure DoOnFullScreen(FullScreen: WordBool);
begin

end;

procedure DoOnTheaterMode(TheaterMode: WordBool);
begin

end;


procedure BuildPositionalDispIds(pDispIds: PDispIdList; const dps: TDispParams);
var
  i: integer;
begin
  Assert(pDispIds <> nil);
  for i := 0 to dps.cArgs - 1 do
    pDispIds^[i] := dps.cArgs - 1 - i;
  if (dps.cNamedArgs <= 0) then Exit;
  for i := 0 to dps.cNamedArgs - 1 do
    pDispIds^[dps.rgdispidNamedArgs^[i]] := i;
end;

function TIEHelper.Invoke(DispID: Integer; const IID: TGUID; LocaleID: Integer;
  Flags: Word; var Params; VarResult, ExcepInfo, ArgErr: Pointer): HResult;
type
  POleVariant = ^OleVariant;
var
  dps: TDispParams absolute Params;
  bHasParams: boolean;
  pDispIds: PDispIdList;
  iDispIdsSize: integer;
begin
  Result := DISP_E_MEMBERNOTFOUND;
  pDispIds := nil;
  iDispIdsSize := 0;
  bHasParams := (dps.cArgs > 0);
  if (bHasParams) then
  begin
    iDispIdsSize := dps.cArgs * SizeOf(TDispId);
    GetMem(pDispIds, iDispIdsSize);
  end;
  try
    if (bHasParams) then BuildPositionalDispIds(pDispIds, dps);
    case DispId of
      102:
        begin
          DoStatusTextChange(dps.rgvarg^[pDispIds^[0]].bstrval);
          Result := S_OK;
        end;
      108:
        begin
          DoProgressChange(dps.rgvarg^[pDispIds^[0]].lval, dps.rgvarg^[pDispIds^[1]].lval);
          Result := S_OK;
        end;
      105:
        begin
          DoCommandStateChange(dps.rgvarg^[pDispIds^[0]].lval, dps.rgvarg^[pDispIds^[1]].vbool);
          Result := S_OK;
        end;
      106:
        begin
          DoDownloadBegin();
          Result := S_OK;
        end;
      104:
        begin
          DoDownloadComplete();
          Result := S_OK;
        end;
      113:
        begin
          DoTitleChange(dps.rgvarg^[pDispIds^[0]].bstrval);
          Result := S_OK;
        end;
      112:
        begin
          DoPropertyChange(dps.rgvarg^[pDispIds^[0]].bstrval);
          Result := S_OK;
        end;
      250:
        begin
          DoBeforeNavigate2(IDispatch(dps.rgvarg^[pDispIds^[0]].dispval), POleVariant(dps.rgvarg^[pDispIds^[1]].pvarval)^, POleVariant(dps.rgvarg^[pDispIds^[2]].pvarval)^, POleVariant(dps.rgvarg^[pDispIds^[3]].pvarval)^, POleVariant(dps.rgvarg^[pDispIds^[4]].pvarval)^, POleVariant(dps.rgvarg^[pDispIds^[5]].pvarval)^, dps.rgvarg^[pDispIds^[6]].pbool^);
          Result := S_OK;
        end;
      251:
        begin
          DoNewWindow2(IDispatch(dps.rgvarg^[pDispIds^[0]].pdispval^), dps.rgvarg^[pDispIds^[1]].pbool^);
          Result := S_OK;
        end;
      252:
        begin
          DoNavigateComplete2(IDispatch(dps.rgvarg^[pDispIds^[0]].dispval), POleVariant(dps.rgvarg^[pDispIds^[1]].pvarval)^);
          Result := S_OK;
        end;
      259:
        begin
          DoDocumentComplete(IDispatch(dps.rgvarg^[pDispIds^[0]].dispval), POleVariant(dps.rgvarg^[pDispIds^[1]].pvarval)^);
          Result := S_OK;
        end;
      253:
        begin
          DoOnQuit();
          Result := S_OK;
        end;
      254:
        begin
          DoOnVisible(dps.rgvarg^[pDispIds^[0]].vbool);
          Result := S_OK;
        end;
      255:
        begin
          DoOnToolBar(dps.rgvarg^[pDispIds^[0]].vbool);
          Result := S_OK;
        end;
      256:
        begin
          DoOnMenuBar(dps.rgvarg^[pDispIds^[0]].vbool);
          Result := S_OK;
        end;
      257:
        begin
          DoOnStatusBar(dps.rgvarg^[pDispIds^[0]].vbool);
          Result := S_OK;
        end;
      258:
        begin
          DoOnFullScreen(dps.rgvarg^[pDispIds^[0]].vbool);
          Result := S_OK;
        end;
      260:
        begin
          DoOnTheaterMode(dps.rgvarg^[pDispIds^[0]].vbool);
          Result := S_OK;
        end;
    end;
  finally
    if (bHasParams) then FreeMem(pDispIds, iDispIdsSize);
  end;
end;


function TIEHelper.GetIDsOfNames(const IID: TGUID; Names: Pointer;
  NameCount, LocaleID: Integer; DispIDs: Pointer): HResult;
begin
  Result := E_NOTIMPL;
end;

function TIEHelper.GetTypeInfo(Index, LocaleID: Integer;
  out TypeInfo): HResult;
begin
  Result := E_NOTIMPL;
  pointer(TypeInfo) := nil;
end;

function TIEHelper.GetTypeInfoCount(out Count: Integer): HResult;
begin
  Result := E_NOTIMPL;
  Count := 0;
end;


function TIEHelper.GetSite(const riid: TIID; out site: IUnknown): HResult;
begin
//  Result := S_OK;
  if Assigned(IE) then result:=IE.QueryInterface(riid, site)
   else
     Result:= E_FAIL;
end;

function TIEHelper.SetSite(const pUnkSite: IUnknown): HResult;
var
  cmdTarget: IOleCommandTarget;
  Sp: IServiceProvider;
  CPC: IConnectionPointContainer;
  CP: ICOnnectionPoint;
begin
  if Assigned(pUnkSite) then begin
    cmdTarget := pUnkSite as IOleCommandTarget;
    Sp := CmdTarget as IServiceProvider;

      if Assigned(Sp)then
        Sp.QueryService(IWebbrowserApp, IWebbrowser2, IE);
      if Assigned(IE) then begin
        IE.QueryInterface(IConnectionPointContainer, CPC);
        CPC.FindConnectionPoint(DWEBbrowserEvents2, CP);
        CP.Advise(Self, Cookie)
      end;
  end;
  Result := S_OK;
end;


procedure TIEHelperFactory.AddKeys;
var S: string;
begin
  S := GUIDToString(CLASS_IEHelper);
  with TRegistry.Create do
  try
    RootKey := HKEY_LOCAL_MACHINE;
    if OpenKey("SoftwareMicrosoftWindowsCurrentVersionexplorerBrowser Helper Objects" + S, TRUE)
      then CloseKey;
  finally
    free;
  end;
end;

procedure TIEHelperFactory.RemoveKeys;
var S: string;
begin
  S := GUIDToString(CLASS_IEHelper);
  with TRegistry.Create do
  try
    RootKey := HKEY_LOCAL_MACHINE;
    DeleteKey("SoftwareMicrosoftWindowsCurrentVersionexplorerBrowser Helper Objects" + S);
  finally
    free;
  end;
end;

procedure TIEHelperFactory.UpdateRegistry(Register: Boolean);
begin
  inherited UpdateRegistry(Register);
  if Register then AddKeys else RemoveKeys;
end;

initialization
  TIEHelperFactory.Create(ComServer, TIEHelper, Class_IEHelper,
    "IEHelper", "", ciMultiInstance, tmApartment);
end.

    代码很长,但是关键的是TIEHelper.SetSite方法以及TIEHelper.Invoke方法。在TIEHelper.SetSite方法中注意以下语句:
      if Assigned(Sp)then
        Sp.QueryService(IWebbrowserApp, IWebbrowser2, IE);
      if Assigned(IE) then begin
        IE.QueryInterface(IConnectionPointContainer, CPC);
        CPC.FindConnectionPoint(DWEBbrowserEvents2, CP);
        CP.Advise(Self, Cookie)

    上面的语句作用是,首先获得IE的Webbrowser接口,然后寻找到连接点。并通过Advise方法建立COM自身与连接点的连接。
    当连接建立成功后,IE在有事件引发后,会调用连接到自身的IDispatch接口对象的Invoke方法。不同的事件对应不同的DispID编码,我们可以在程序中判断DispID并做相应的处理。在上面的程序中,我们只处理了BeforeNavigate2 事件,处理函数是DoBeforeNavigate2,在该函数中,如果浏览的站点不是"http://www.applevb.com/"的话,程序会提示:"你不可以浏览其它站点"并强行转到http://www.applevb.com。
    很多的软件,象“护花使者”以及“3721”一类的中文网址”都是利用上面的原理来实现对IE浏览器事件响应的,例如3721,当用户输入一个中文词并浏览时,COM组件可以在BeforeNavigate2 事件中编写代码访问服务器并转到正确的站点上去。
    以上程序在Win2K、Delphi 5下编写 Win98、Win2K下编辑通过,如果大家需要源程序或者对于COM编程需要有什么的指教的话,欢迎到我的主页
http://www.applevb.com 访问,我愿意同大家一起探讨。


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利用 D el ph i 编写 I E 扩展
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发帖时间:2016-7-9   |   查看数:0   |   回复数:0
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