C++ WM\_COPYDATA 实现进程通信

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);}

最终效果图：

发送端

接收端：