从windows服务中打开窗口进程

来源：岁月联盟编辑：zhuzhu 时间：2007-01-16

AVR地方业务中有一个DBA_BJLDNW工具要在服务器上运行着.一旦断开业务即中止.需要写一个守护程序监视它,

一旦发现关闭了即重新启动.

为了防止守护程序本身被用户关闭,所以我打算做一个windows服务在后台运行.每5分钟列举一个当前系统进程,如果

没有发现DBA_BJLDNW.exe则重新启动.

问题是windows服务不是窗口进程,在这个进程中调用ShellExecute打开的应用程序也是在后台运行,不能显示在当前窗口中.

后来搜索到可以在Windows服务中打开窗口程序的方法.就是打开用户WinSta0和desktop,取得和用户交互的权限后再打开窗口进程,果然可以在windows服务中打开窗口进程了:

HINSTANCE hProcessSnap = NULL;
PROCESSENTRY32 pe32 = {0};

//获取进程的内存镜照
hProcessSnap = (HINSTANCE) ::CreateToolhelp32Snapshot(TH32CS_SNAPPROCESS,0);
if(hProcessSnap == (HANDLE) -1) return ;
pe32.dwSize = sizeof(PROCESSENTRY32);

DWORD flag = 0;
CString theProcssName = "DBA_BJLDNW.exe";

//列举进程

if(::Process32First(hProcessSnap,&pe32)){
  do{
   if(!theProcssName.CompareNoCase(pe32.szExeFile)){
    flag = 1;
    break;
   }
  }
  while(Process32Next(hProcessSnap,&pe32));
}
::CloseHandle(hProcessSnap);

if(!flag){ //如果没有找到

  HDESK   hdeskCurrent;
  HDESK   hdesk;
  HWINSTA hwinstaCurrent;
  HWINSTA hwinsta;

hwinstaCurrent = GetProcessWindowStation();

  if (hwinstaCurrent == NULL){
   LogEvent(_T("get window station err"));
   return ;
  }

  hdeskCurrent = GetThreadDesktop(GetCurrentThreadId());
  if (hdeskCurrent == NULL){
   LogEvent(_T("get window desktop err"));
   return ;
  }

//打开用户的winsta0
  hwinsta = OpenWindowStation("winsta0", FALSE,
   WINSTA_ACCESSCLIPBOARD   |
   WINSTA_ACCESSGLOBALATOMS |
   WINSTA_CREATEDESKTOP     |
   WINSTA_ENUMDESKTOPS      |
   WINSTA_ENUMERATE         |
   WINSTA_EXITWINDOWS       |
   WINSTA_READATTRIBUTES    |
   WINSTA_READSCREEN        |
   WINSTA_WRITEATTRIBUTES);
  if (hwinsta == NULL){
   LogEvent(_T("open window station err"));
   return ;
  }

  if (!SetProcessWindowStation(hwinsta)){
   LogEvent(_T("Set window station err"));
   return ;
  }

  //打开desktop
  hdesk = OpenDesktop("default", 0, FALSE,
   DESKTOP_CREATEMENU |
   DESKTOP_CREATEWINDOW |
   DESKTOP_ENUMERATE    |
   DESKTOP_HOOKCONTROL |
   DESKTOP_JOURNALPLAYBACK |
   DESKTOP_JOURNALRECORD |
   DESKTOP_READOBJECTS |
   DESKTOP_SWITCHDESKTOP |
   DESKTOP_WRITEOBJECTS);
  if (hdesk == NULL){
   LogEvent(_T("Open desktop err"));
   return;
  }

SetThreadDesktop(hdesk);

  ::ShellExecute(0,NULL,"f://ivrtj//DBA//DBA_BJLDNW.exe",NULL,NULL,SW_MAXIMIZE);
  CString msg = "DBA_BJLDNW.exe 被重启动";
  LogEvent(msg);

  SetProcessWindowStation(hwinstaCurrent);
  SetThreadDesktop(hdeskCurrent);
  CloseWindowStation(hwinsta);
  CloseDesktop(hdesk);
}

服务安装后一定要注意,右键->属性->登录,选择本地系统帐户下面的允许服务与桌面交互打勾.