在ActiveX控件中检测IE中STOP按钮的按下

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; }