CreateProcess并隐藏窗口

PROCESS_INFORMATION pi;
STARTUPINFO si; //隐藏进程窗口
si.cb = sizeof(STARTUPINFO);
si.lpReserved = NULL;
si.lpDesktop = NULL;
si.lpTitle = NULL;
si.dwFlags = STARTF_USESHOWWINDOW;
si.wShowWindow = SW_HIDE;
si.cbReserved2 = NULL;
si.lpReserved2 = NULL;
BOOL ret = CreateProcess(NULL,"notepad.exe",NULL,NULL,FALSE,0,NULL,NULL,&si,&pi);
if(ret)
{
CloseHandle(pi.hThread);
WaitForSingleObject(pi.hProcess,INFINITE);
GetExitCodeProcess(pi.hProcess,&dwExitCode);
CloseHandle(pi.hProcess);
CString tmp;
tmp.Format("进程关闭",i);
AfxMessageBox(tmp);
}