解决COM显示HTML，无法copy、paste的问题

这两个操作默认是被屏蔽了的，需要手动拦截按键消息然后处理。
如果嵌入HTML的窗口拿不到WM_KEYDOWN这样的消息，就只好直接在消息循环里拦截了：
{
while (0 != (r = GetMessage(&msg, NULL, 0, 0))) {
if (r == -1) {
break;
}
if (CheckIfDealCopyPaste(msg)) {
continue;
}
TranslateMessage(&msg);
DispatchMessage(&msg);
}
}
然后检查按键：
bool CheckIfDealCopyPaste(const MSG &msg)
{
if (msg.message != WM_KEYDOWN) {
return false;
}
BOOL bCtrlDown = (0x80 & GetKeyState(VK_CONTROL));
if (msg.wParam == _T('X') && bCtrlDown) {
DoCommand(L"Cut");
return true;
} else if (msg.wParam == _T('C') && bCtrlDown) {
DoCommand(L"Copy");
return true;
} else if (msg.wParam == _T('V') && bCtrlDown) {
DoCommand(L"Paste");
return true;
} else if (msg.wParam == _T('A') && bCtrlDown) {
DoCommand(L"SelectAll");
return true;
}
return false;
}
void DoCommand(LPCWSTR szCommand)
{
BSTR bStr = SysAllocString(szCommand);
DoWebCommand(m_hWnd, bStr); // m_hWnd为嵌入HTML的窗口句柄
SysFreeString(bStr);
}
// 这是一个C函数
void WINAPI DoWebCommand(HWND hWnd, BSTR idCmd)
{
IOleObject **browserHandle;
IOleObject *browserObject;
TRACE_FUNC;
if ((browserHandle = (IOleObject **)GetWindowLongPtr(hWnd, GWLP_USERDATA)))
{
browserObject = *browserHandle;
do
{
IWebBrowser2 *webBrowser2 = NULL;
IConnectionPointContainer *spCPC = NULL;
IConnectionPoint *spCP = NULL;
IDispatch *pDoc = NULL;
IHTMLDocument2 *htmlDoc = NULL;
VARIANT_BOOL bVal;
HRESULT hr;
hr = browserObject->lpVtbl->QueryInterface(browserObject, &IID_IWebBrowser2, (void**)&webBrowser2);