C++ 跨应用程序发送消息

void CDemoDlg::OnLButtonDown(UINT nFlags, CPoint point)
{
	// TODO: 在此添加消息处理程序代码和/或调用默认值
	if(point.x >= m_rtCtrl.left && point.x <= m_rtCtrl.right
		|| point.y >= m_rtCtrl.top && point.y <= m_rtCtrl.bottom)
	{
		m_bCapturing = TRUE;
		SetCapture();
		SetCursor(m_hCursor);
	}

	CDialogEx::OnLButtonDown(nFlags, point);
}


void CDemoDlg::OnLButtonUp(UINT nFlags, CPoint point)
{
	// TODO: 在此添加消息处理程序代码和/或调用默认值
	if(m_bCapturing)
	{
		ReleaseCapture();
		m_bCapturing = FALSE;
		POINT pt = point;
		ClientToScreen(&pt);
		m_hwndDest = ::WindowFromPoint(pt);
		TCHAR szBuf[MAX_PATH] = {0};
		_stprintf(szBuf,_T("0x%.8X"),m_hwndDest);
		SetDlgItemText(IDC_EDT_HWND, szBuf);
		GetClassName(m_hwndDest,szBuf,MAX_PATH);
		SetDlgItemText(IDC_EDT_CLASS,szBuf);
		::SendMessage(m_hwndDest,WM_GETTEXT, MAX_PATH,(LPARAM)szBuf);
		SetDlgItemText(IDC_EDT_TEXT,szBuf);
	}
	CDialogEx::OnLButtonUp(nFlags, point);
}


void CDemoDlg::OnBnClickedBtnSettext()
{
	// TODO: 在此添加控件通知处理程序代码
	CString str;
	GetDlgItemText(IDC_EDT_TEXT,str);
	::SendMessage(m_hwndDest,WM_SETTEXT,0,(LPARAM)(LPCTSTR)str);
}


void CDemoDlg::OnBnClickedBtnClose()
{
	// TODO: 在此添加控件通知处理程序代码
	::SendMessage(m_hwndDest,WM_CLOSE,0,0);
}