C++ WM_COPYDATA 实现进程通信

完整工程可以到：http://download.csdn.net/detail/zy_dreamer/5385153 下载

基于MFC

用于存储数据的自定义结构体：

struct MSG_STRUCT 
{
	wchar_t msg[256];
};

发送端，发送按钮响应事件的代码

void CSendWM_COPYDATADlg::OnBnClickedSendmessage()
{
	MSG_STRUCT smsg;
	GetDlgItemText(IDC_MESSAGE,smsg.msg,256);
	HWND hTargetWnd=NULL;
	hTargetWnd=::FindWindow(NULL,_T("ReceiveWM_COPYDATA
		COPYDATASTRUCT cds;
		cds.cbData=sizeof(MSG_STRUCT);
		cds.lpData=&smsg;
		if(hTargetWnd==NULL)
			return;
		::SendMessage(hTargetWnd,WM_COPYDATA,reinterpret_cast<WPARAM>(m_hWnd), 
			reinterpret_cast<LPARAM>(&cds));
}

接收端，响应WM_COPYDATA的代码

BOOL CReceiveWM_COPYDATADlg::OnCopyData(CWnd* pWnd, COPYDATASTRUCT* pCopyDataStruct)
{
	// TODO: Add your message handler code here and/or call default
	CString cs_str;
	CString cs_PrivStr;
	GetDlgItemText(IDC_RECEIVEMSG,cs_PrivStr);
	++m_ReceiveNum;
	MSG_STRUCT smsg;
	if(pCopyDataStruct->cbData==sizeof(smsg))
	{
		memcpy_s(&smsg,sizeof(smsg),pCopyDataStruct->lpData,pCopyDataStruct->cbData);
	}
	//MessageBox(smsg.msg);
	cs_str.Format(_T("消息%d:%s\r\n"),m_ReceiveNum,smsg.msg);
	cs_str=cs_PrivStr+cs_str;
	SetDlgItemText(IDC_RECEIVEMSG,cs_str);
	return CDialog::OnCopyData(pWnd, pCopyDataStruct);
}

发送端

接收端：