在ActiveX控件中检测IE中STOP按钮的按下

很多ActiveX控件，好比：ActiveMovie, IE东西条中的Stop按钮对付他们来说有非凡的意义。当Stop按钮下定时这些控件可以遏制播放配景音乐或动画。这篇文章将汇报你在ActiveX控件中添加IOleCommandTarget接口来捕获Stop 按钮的行动。

具体内容

为了支持IOleCommandTarget接口你必需手工在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()函数中捕捉OLECMDID_STOP呼吁id (IE东西条中Stop 按钮的id)。详细代码如下：

// 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;
}