MFC 进程之间通讯之WM_COPYDATA消息

还是之前的两个基于对话框的MFC测试工程，名字分别为ShareMemoryTest和ShareMemoryTest2

在ShareMemoryTest工程中的按钮响应函数添加如下代码：

void CShareMemoryTestDlg::OnBnClickedOk()
{
    // TODO: Add your control notification handler code here
    //CDialogEx::OnOK();

    HWND receiveWindow = ::FindWindow(NULL, "ShareMemoryTest2");  
    if (receiveWindow == NULL)  
        return; 

    CString sendData = "message copy data";

    COPYDATASTRUCT copyData = { 0 };
    copyData.lpData = sendData.GetBuffer();
    copyData.cbData = sendData.GetLength();

    ::SendMessage(receiveWindow, WM_COPYDATA, (WPARAM)GetSafeHwnd(), (LPARAM)&copyData);

    sendData.ReleaseBuffer();
}

 

在ShareMemoryTest2工程中ShareMemoryTest2Dlg.h中添加

afx_msg BOOL OnCopyData(CWnd* pWnd, COPYDATASTRUCT* pCopyDataStruct);

ShareMemoryTest2Dlg.cpp的BEGIN_MESSAGE_MAP(CShareMemoryTest2Dlg, CDialogEx)中添加

ON_WM_COPYDATA()

最后插入如下代码：

BOOL CShareMemoryTest2Dlg::OnCopyData(CWnd* pWnd, COPYDATASTRUCT* pCopyDataStruct)
{
    // TODO: Add your message handler code here and/or call default

    if (pCopyDataStruct->cbData > 0)
    {
        char recvData[256] = {0} ;
        strncpy(recvData, (char *)pCopyDataStruct->lpData, pCopyDataStruct->cbData);
        AfxMessageBox(recvData);
    }

    return CDialogEx::OnCopyData(pWnd, pCopyDataStruct);
}

点击第一个进程的ok按钮，运行结果为：