消息传递字符串 wm_copydata的使用

BOOL CClientDemoDlg::OnCopyData(CWnd* pWnd, COPYDATASTRUCT* pCopyDataStruct)  
{  
    if (pCopyDataStruct != NULL)  
    {  
        LPCTSTR pszText = (LPCTSTR)(pCopyDataStruct->lpData);  
        DWORD dwLength = (DWORD)(pCopyDataStruct->cbData);  
        TCHAR szRecvText[1024] = {0};  
        memcpy(szRecvText, pszText, dwLength);  
        MessageBox(szRecvText, _T("Test"), MB_OK);  
    }  
    return CDialog::OnCopyData(pWnd, pCopyDataStruct);  
}

CString strWindowTitle =  _T("ClientDemo");  
CString strDataToSend = _T("Hello, Everyone fsdfsdfsdfdsfds,this is a test demo!");  
HWND hOtherWnd = ::FindWindow(NULL, strWindowTitle.GetBuffer(0));  
if (hOtherWnd != NULL && ::IsWindow(hOtherWnd))  
{  
    COPYDATASTRUCT cpd;  
    cpd.dwData = 0;  
    cpd.cbData = strDataToSend.GetLength() * sizeof(TCHAR);  
    cpd.lpData = (void*)strDataToSend.GetBuffer(0);  
    HRESULT hResult = ::SendMessage(hOtherWnd, WM_COPYDATA, (WPARAM)(AfxGetApp()->m_pMainWnd), (LPARAM)&cpd);  
    strDataToSend.ReleaseBuffer();  
}