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