用WM_COPYDATA实现进程通信

用WM_COPYDATA的前提：
1，知道接收消息进程的句柄。
2，接收消息进程重载了WM_COPYDATA消息映射 
发送端

void CSendDlg::OnBnClickedSend()

{

    CWnd *pWnd = CWnd::FindWindow(NULL,"接收窗口的标题");



    CString sCopyData = "传递的字符串";

    COPYDATASTRUCT cpd;

    cpd.dwData = 0;

    cpd.cbData = sCopyData.GetLength() + 1;//多加一个长度，防止乱码

    cpd.lpData = (void*)sCopyData.GetBuffer(cpd.cbData);



    pWnd->SendMessage(WM_COPYDATA,NULL,(LPARAM)&cpd);

}

接收端

// 声明
afx_msg BOOL OnCopyData(CWnd* pWnd, COPYDATASTRUCT* pCopyDataStruct);
// 实现
ON_WM_COPYDATA()
BOOL CReceiveDlg::OnCopyData( CWnd* pWnd, COPYDATASTRUCT* pCopyDataStruct )
{
    AfxMessageBox((LPCSTR)(pCopyDataStruct->lpData));
    return CWnd::OnCopyData(pWnd, pCopyDataStruct);
}

注意乱码的处理。
url:http://greatverve.cnblogs.com/archive/2012/12/17/WM_COPYDATA.html