在activex控件中检测ie中stop按钮的按下.txt

关于ie控制的编程各种方面的内容和源代码

在ActiveX控件中检测IE中STOP按钮的按下


摘要 

许多ActiveX控件，比如：ActiveMovie, IE工具条中的Stop按钮对于他们来说有特殊的意义。当Stop按钮下按时这些控件可以停止播放背景音乐或动画。这篇文章将告诉你在ActiveX控件中添加IOleCommandTarget接口来捕捉Stop 按钮的动作。 


详细内容 
为了支持IOleCommandTarget接口你必须手工在COleControl派生类的.h 和.cpp文件中添加如下代码。然后，你可以在IOleCommandTarget::Exec()函数中捕获OLECMDID_STOP命令id (IE工具条中Stop 按钮的id)。具体代码如下： 

// COleControl派生类的.h文件: 
class CMyOleControl : public COleControl 
{ 
... 

// Interface Maps 
protected: 

// Add the following to support the IOleCommandTarget interface. 
// NOTE: Nested class name is called CmdTargetObj 
DECLARE_INTERFACE_MAP() 

BEGIN_INTERFACE_PART(CmdTargetObj, IOleCommandTarget) 
STDMETHOD(QueryStatus)(const GUID*, ULONG, OLECMD[], OLECMDTEXT*); 
STDMETHOD(Exec)(const GUID*, DWORD, DWORD, VARIANTARG*, 
VARIANTARG*); 
END_INTERFACE_PART(CmdTargetObj) 
}; 


//COleControl派生类的.cpp文件: 
BEGIN_INTERFACE_MAP(CMyOleControl, COleControl) 
INTERFACE_PART(CMyOleControl, IID_IOleCommandTarget, CmdTargetObj) 
END_INTERFACE_MAP() 

ULONG FAR EXPORT CMyOleControl::XCmdTargetObj::AddRef() 
{ 
METHOD_PROLOGUE(CMyOleControl, CmdTargetObj) 
return pThis->ExternalAddRef(); 
} 

ULONG FAR EXPORT CMyOleControl::XCmdTargetObj::Release() 
{ 
METHOD_PROLOGUE(CMyOleControl, CmdTargetObj) 
return pThis->ExternalRelease(); 
} 

HRESULT FAR EXPORT CMyOleControl::XCmdTargetObj::QueryInterface( 
REFIID iid, void FAR* FAR* ppvObj) 
{ 
METHOD_PROLOGUE(CMyOleControl, CmdTargetObj) 
return (HRESULT)pThis->ExternalQueryInterface(&iid, ppvObj); 
} 

STDMETHODIMP CMyOleControl::XCmdTargetObj::QueryStatus( 
const GUID* pguidCmdGroup, ULONG cCmds, OLECMD rgCmds[], 
OLECMDTEXT* pcmdtext) 
{ 
METHOD_PROLOGUE(CMyOleControl, CmdTargetObj) 
//... add YOUR own code here. 

return S_OK; 
} 

STDMETHODIMP CMyOleControl::XCmdTargetObj::Exec( 
const GUID* pguidCmdGroup, DWORD nCmdID, DWORD nCmdExecOpt, 
VARIANTARG* pvarargIn, VARIANTARG* pvarargOut) 
{ 
METHOD_PROLOGUE(CMyOleControl, CmdTargetObj) 
if (nCmdID == OLECMDID_STOP) 
{ 
// ... STOP button is clicked, add YOUR own code here. 
// We just display a message box. 
::MessageBox(NULL, "STOP","CMyOleControl", MB_OK); 
} 

return S_OK; 
}