C++ 当嵌入式ActiveX控件接收到并失去键盘焦点时,如何获得通知?
我有一个基于C++/MFC对话框的小型应用程序,带有嵌入式Internet Explorer ActiveX控件。我想知道嵌入式控件何时接收和丢失键盘焦点。我想这样做:C++ 当嵌入式ActiveX控件接收到并失去键盘焦点时,如何获得通知?,c++,winapi,mfc,activex,activexobject,C++,Winapi,Mfc,Activex,Activexobject,我有一个基于C++/MFC对话框的小型应用程序,带有嵌入式Internet Explorer ActiveX控件。我想知道嵌入式控件何时接收和丢失键盘焦点。我想这样做: BOOL CWinAppDerivedClass::PreTranslateMessage(MSG* pMsg) { if(pMsg->message == WM_SETFOCUS) { //if(checkIEWindow(pMsg->hwnd)) {
BOOL CWinAppDerivedClass::PreTranslateMessage(MSG* pMsg)
{
if(pMsg->message == WM_SETFOCUS)
{
//if(checkIEWindow(pMsg->hwnd))
{
//Process it
}
}
return CWinApp::PreTranslateMessage(pMsg);
}
但无论我做什么,WM_SETFOCUS似乎根本没有被发送出去
你知道怎么做吗?一种方法是在整个流程中使用 首先,您需要将钩子安装在GUI应用程序主线程的某个位置。如果是MFC对话框窗口,好的位置是
OnInitDialog
通知处理程序:
//hHook is "this" class member variable, declared as HHOOK. Set it to NULL initially.
hHook = ::SetWindowsHookEx(WH_CALLWNDPROC, CallWndProcHook, AfxGetInstanceHandle(), ::GetCurrentThreadId());
然后,可以将挂钩程序设置为:
static LRESULT CALLBACK CallWndProcHook(int nCode, WPARAM wParam, LPARAM lParam)
{
if (nCode == HC_ACTION)
{
CWPSTRUCT* pCWS = (CWPSTRUCT*)lParam;
//Check if this is the message we need
if(pCWS->message == WM_SETFOCUS ||
pCWS->message == WM_KILLFOCUS)
{
//Check if this is the window we need
if(pCWS->hwnd == hRequiredWnd)
{
//Process your message here
}
}
}
return ::CallNextHookEx(NULL, nCode, wParam, lParam);
}
还记得要脱钩。它的一个好地方是PostNcDestroy
处理程序:
if(hHook != NULL)
{
::UnhookWindowsHookEx(hHook);
hHook = NULL;
}