轉載自：http://www.cnblogs.com/pen-ink/articles/1815306.html#commentform
//①自定義消息
//兩個進程中定義相同的消息
#define WM_COMM (WM_USER + 100)
//發送窗口發送按鈕處理，自定義消息為WM_COMM，接收窗口為DataRecv
void CDataSendDlg::OnBnClickedOk()
{
// TODO: 在此添加控件通知處理程序代碼
CWnd *pWnd = CWnd::FindWindow(NULL, _T("DataRecv"));
if(pWnd == NULL)
{
MessageBox(_T("Unable to find DataRecv."));
return;
}
pWnd->PostMessage(WM_COMM, NULL, NULL);
}
//接收窗口處理WM_COMM自定義消息
BEGIN_MESSAGE_MAP(CDataRecvDlg, CDialog)
ON_MESSAGE(WM_COMM, OnRecvMsg)
END_MESSAGE_MAP()
LRESULT CDataRecvDlg::OnRecvMsg(WPARAM, LPARAM)
{
MessageBox(_T("I Received Message!"));
return (LRESULT)0;
}
//②WM_COPYDATA消息，主要目的是允許在進程間傳遞只讀數據(COPYDATASTRUCT結構封裝),用SendMessage()發送
//發送窗口發送只讀數據
void CDataSendDlg::OnBnClickedOk()
{
// TODO: 在此添加控件通知處理程序代碼
CString str;
GetDlgItemText(IDC_EDIT2,str);
CWnd *pWnd = CWnd::FindWindow(NULL, _T("DataRecv"));
if(pWnd == NULL)
{
MessageBox(_T("Unable to find DataRecv."));
return;
}
CString data;
GetDlgItemText(IDC_EDIT2, data);
COPYDATASTRUCT cpd = {0};
cpd.cbData = (data.GetLength() + 1) * 2;
cpd.lpData = (PVOID)data.GetString();
pWnd->SendMessage(WM_COPYDATA, 0, (LPARAM)&cpd);
}
//接收窗口接收只讀數據
BOOL CDataRecvDlg::OnCopyData(CWnd* pWnd, COPYDATASTRUCT* pCopyDataStruct)
{
// TODO: 在此添加消息處理程序代碼和/或調用默認值
CString str;
str = (LPCWSTR)pCopyDataStruct->lpData;
str = str.Left(pCopyDataStruct->cbData);
SetDlgItemText(IDC_EDIT1, str);
return CDialog::OnCopyData(pWnd, pCopyDataStruct);
}
// 發送WM_CLOSE 消息
void CSendMessageToWindowDlg::OnBnClickedButtonSendmessage()
{
// TODO: 在此添加控件通知處理程序代碼
CWnd *pWnd = CWnd::FindWindow(NULL, _T("spyXX"));
if (pWnd == NULL)
{
MessageBox(_T("接收程序沒有運行!"));
return;
}
pWnd->SendMessage(WM_CLOSE, NULL, 0);
}