发布时间 : 星期四 文章ActiveX控件的MFC设计之旅更新完毕开始阅读
return lpDispatch->Invoke(dispidMember, riid, lcid, \\
wFlags, pdispparams, pvarResult, \\ pexcepinfo, puArgErr); \\ } \\
/////////////////////////////////////////////////////////////////////
// TRY_DUAL and CATCH_ALL_DUAL are used to provide exception handling // for your dual interface methods. CATCH_ALL_DUAL takes care of // returning the appropriate error code. #define TRY_DUAL(iidSource) \\ HRESULT _hr = S_OK; \\
REFIID _riidSource = iidSource; \\ TRY \\
#define CATCH_ALL_DUAL \\ CATCH(COleException, e) \\ { \\
_hr = e->m_sc; \\ } \\
AND_CATCH_ALL(e) \\ { \\
AFX_MANAGE_STATE(pThis->m_pModuleState); \\ _hr = DualHandleException(_riidSource, e); \\ } \\
END_CATCH_ALL \\ return _hr; \\
///////////////////////////////////////////////////////////////////// // DualHandleException is a helper function used to set the system's // error object, so that container applications that call through // VTBLs can retrieve rich error information
HRESULT DualHandleException(REFIID riidSource, const CException* pAnyException); /////////////////////////////////////////////////////////////////////
// DECLARE_DUAL_ERRORINFO expands to declare the ISupportErrorInfo // support class. It works together with DUAL_ERRORINFO_PART and // IMPLEMENT_DUAL_ERRORINFO defined below. #define DECLARE_DUAL_ERRORINFO() \\
BEGIN_INTERFACE_PART(SupportErrorInfo, ISupportErrorInfo) \\ STDMETHOD(InterfaceSupportsErrorInfo)(THIS_ REFIID riid); \\ END_INTERFACE_PART(SupportErrorInfo) \\
/////////////////////////////////////////////////////////////////////
// DUAL_ERRORINFO_PART adds the appropriate entry to the interface map // for ISupportErrorInfo, if you used DECLARE_DUAL_ERRORINFO. #define DUAL_ERRORINFO_PART(objectClass) \\
INTERFACE_PART(objectClass, IID_ISupportErrorInfo, SupportErrorInfo) \\ /////////////////////////////////////////////////////////////////////
// IMPLEMENT_DUAL_ERRORINFO expands to an implementation of // ISupportErrorInfo which matches the declaration in // DECLARE_DUAL_ERRORINFO.
#define IMPLEMENT_DUAL_ERRORINFO(objectClass, riidSource) \\
STDMETHODIMP_(ULONG) objectClass::XSupportErrorInfo::AddRef() \\ { \\
METHOD_PROLOGUE(objectClass, SupportErrorInfo) \\ return pThis->ExternalAddRef(); \\ } \\
STDMETHODIMP_(ULONG) objectClass::XSupportErrorInfo::Release() \\ { \\
METHOD_PROLOGUE(objectClass, SupportErrorInfo) \\ return pThis->ExternalRelease(); \\ } \\
STDMETHODIMP objectClass::XSupportErrorInfo::QueryInterface( \\ REFIID iid, LPVOID* ppvObj) \\ { \\
METHOD_PROLOGUE(objectClass, SupportErrorInfo) \\ return pThis->ExternalQueryInterface(&iid, ppvObj); \\ } \\
STDMETHODIMP objectClass::XSupportErrorInfo::InterfaceSupportsErrorInfo( \\ REFIID iid) \\ { \\
METHOD_PROLOGUE(objectClass, SupportErrorInfo) \\ return (iid == riidSource) ? S_OK : S_FALSE; \\ }
下面是jiangsheng(蒋晟.MSMVP2004Jan)老大的精彩回贴：
Knowledge Base Article Q157437: \ Fires Events from a Second Thread\
http://support.microsoft.com/support/kb/articles/q157/4/37.asp
Knowledge Base Article Q196026: \ Firing Event in Second Thread Causes IPF or GPF\
http://support.microsoft.com/support/kb/articles/q196/0/26.asp
Michael Lindig's ATL: Firing events from worker threads article on CodeGuru.com
http://www.codeguru.com/atl/ThreadEvents.shtml
Knowledge Base Article Q280512: \ ATLCPImplMT Encapsulates ATL Event Firing Across COM Apartments\
http://support.microsoft.com/support/kb/articles/q280/5/12.asp
COM FAQ 11: HOWTO: Post messages to a hidden window for raising events from an Apartment-threaded object employing worker threads http://www.mvps.org/vcfaq/com/11.htm
这是从csdn上摘来的一段（忘了原贴位置了，很是抱歉），主要是解决ActiveX控件如何从工作线程中触发事件的，因为自己以前也遇到过这个问题，所以今天又给翻来出来。
上面提到的解决方法有许多都是针对ATL控件的，虽然MFC下也应该可以用，不过似乎太过劳师动众了，所以这里选择了microsoft的Fireev.exe例程中的方法来重历一回使用隐藏窗口来触发事件的方法，可以参考Fireev.exe例程
1.新建一无窗口(windowless activation)控件TFire，添加三方法void Start()，void End()和void Trigger(LPCTSTR strParam)和一事件void FireThreadEvent(LPCTSTR strEvent)。这里Start用来开始工作线程，End用来结束工作线程，Trigger用来使工作线程产生事件，ThreadEvent就是所产生的事件名。 整个思路如下：
在CTFireCtrl的Start方法中，创建线程MyThread，创建隐藏窗口CMyWindow，在 Trigger方法中，通过SetEvent 通知线程PostMessage给隐藏窗口，再由CMyWindow调用CTFireCtrl的FireTheadEvent触发事件，当调用 CTFireCtr的End方法时，就结束MyThead线程，销毁隐藏窗口
2.先从CWnd派生一CMyWindow类，用作隐藏窗口，
a.添加一成员变量CTFireCtrl* m_pCtrl，用来实际调用CTFireCtrl的FireThreadEvent来产生事件。
b.定义自定义消息define WM_THREADEVENT WM_USER+101。
c.添加自定义消息处理函数 LRESULT OnFireThreadEvent(WPARAM wParam, LPARAM lParam);并加入到消息映射宏中，如下：
BEGIN_MESSAGE_MAP(CMyWindow, CWnd) //{{AFX_MSG_MAP(CMyWindow)
// NOTE - the ClassWizard will add and remove mapping macros here. //}}AFX_MSG_MAP
ON_MESSAGE(WM_THREADEVENT, OnFireThreadEvent) END_MESSAGE_MAP()
OnFireThreadEvent函数定义如下，这里得首先将CTFireCtrl的FireThreadEvent从protected改为public，当然也可以在CTFireCtrl中新建一函数，在该函数中Fire，不过多折腾了一番，这里用和Fireev例程中相同的方法：
LRESULT CMyWindow::OnFireThreadEvent(WPARAM wParam, LPARAM lParam) {
m_pCtrl->FireThreadEvent((LPCTSTR)lParam); return 0; }
d.添加HWND Create()成员函数，以创建窗口，并返回窗口句柄供线程PostMessage使用。函数定义如下：
HWND CMyWindow::Create() {
//Register a window class LPCTSTR classname = 0;
classname = AfxRegisterWndClass(0);
//Create the window and return it's handle
CWnd::CreateEx(NULL,classname,NULL,NULL,1,1,1,1,NULL,NULL); ASSERT(m_hWnd!=NULL); return m_hWnd; }
e.重写PostNcDestroy虚拟函数，以在窗口销毁时删除CMyWindow类对象 void CMyWindow::PostNcDestroy() {
// TODO: Add your specialized code here and/or call the base class CWnd::PostNcDestroy(); delete this; }
3.定义线程函数
DWORD MyThread(LPVOID pParam) {
CTFireCtrl* pctrl = (CTFireCtrl*)pParam; while(!pctrl->m_bEnd){
DWORD dwRes = WaitForSingleObject(pctrl->m_hEvent, 100); if(dwRes == WAIT_OBJECT_0){
PostMessage(pctrl->m_hMyWnd, WM_THREADEVENT, 0, (LPARAM)LPCTSTR(pctrl->m_strParam)); } }
return 0; }
4.可以看到线程函数中需要用到很多变量，因此在CTFireCtrl中定义成员变量如下： BOOL m_bEnd;//控制线程是否结束
HANDLE m_hEvent;//事件句柄，用途就不多说了
HWND m_hMyWnd;//CMyWindow的窗口句柄，由它的Create函数返回获得。
CString m_strParam;//用来传递给事件参数的字符串，仅作参考用，由Trigger方法赋值获得
5.定义Start函数 void CTFireCtrl::Start() {
// TODO: Add your dispatch handler code here //初始化传递给线程的各个变量 m_bEnd = FALSE;
m_hEvent = CreateEvent(NULL, FALSE, FALSE, NULL); //建立传递事件用的隐藏窗口
CMyWindow* pwnd = new CMyWindow; pwnd->m_pCtrl = this;