BOOL CALLBACK EnumProcTxt(HWND hwnd, LPARAM lParam)
{
	if(hwnd == NULL)
		return FALSE;
	else
	{
		int id = -1;
		id = ::GetDlgCtrlID(hwnd);
		if(id == 0xF) 
			::SendMessage(hwnd, WM_SETTEXT, NULL, (LPARAM)lParam);
	}
	return TRUE;
}


CWnd *gpWnd =NULL;



void CTestDlg::OnBnClickedButton1()
{
	// TODO: 在此添加控件通知处理程序代码
	//执行记事本程序
	WinExec("notepad.exe", SW_SHOW);
	Sleep(1000);
	gpWnd = FindWindow(NULL, _T("无标题 - 记事本"));
	HWND parent = gpWnd->m_hWnd;

	// 向新建的文本框中输入信息
	EnumChildWindows(parent, EnumProcTxt, (LPARAM)_T("你好，记事本！"));
}

void CTestDlg::OnBnClickedButton2()
{
	// TODO: 在此添加控件通知处理程序代码
	if(!gpWnd)
		return;

	HWND parent = gpWnd->m_hWnd;
		// 选择记事本的文件菜单下的保存菜单项
	::SetForegroundWindow(parent);        
	keybd_event(VK_MENU, 0, 0, 0);
	Sleep(10);   
	keybd_event(VK_MENU, 0, KEYEVENTF_KEYUP, 0);
	keybd_event('F', 0, 0, 0);
	Sleep(10);
	keybd_event('F', 0, KEYEVENTF_KEYUP, 0);
	keybd_event('S', 0, 0, 0);
	Sleep(10);
	keybd_event('S', 0, KEYEVENTF_KEYUP, 0);
}


void CTestDlg::OnBnClickedButton3()
{
	// TODO: 在此添加控件通知处理程序代码
	if(!gpWnd)
		return;

	HWND parent = gpWnd->m_hWnd;
	::SetForegroundWindow(parent);     
	::SendMessage(parent, WM_SYSCOMMAND, SC_KEYMENU, (WPARAM)'F'); // 只能展开文件菜单，无法后续选择菜单项
}