http://dev.csdn.net/author/axman/420f84d550804bfbaf534819c757a2b9.html
AVR地方業務中有一個DBA_BJLDNW工具要在伺服器上運行著.一旦斷開業務即中止.需要寫一個精靈監視它,
一旦發現關閉了即重新啟動.
為了防止精靈本身被使用者關閉,所以我打算做一個windows服務在後台運行.每5分鐘列舉一個當前系統進程,如果
沒有發現DBA_BJLDNW.exe則重新啟動.
問題是windows服務不是視窗進程,在這個進程中調用ShellExecute開啟的應用程式也是在後台運行,不能顯示在當前視窗中.
後來搜尋到可以在Windows服務中開啟視窗程序的方法.就是開啟使用者WinSta0和desktop,取得和使用者互動的許可權後再開啟視窗進程,果然可以在windows服務中開啟視窗進程了:
HINSTANCE hProcessSnap = NULL;
PROCESSENTRY32 pe32 = {0};
//擷取進程的記憶體鏡照
hProcessSnap = (HINSTANCE) ::CreateToolhelp32Snapshot(TH32CS_SNAPPROCESS,0);
if(hProcessSnap == (HANDLE) -1) return ;
pe32.dwSize = sizeof(PROCESSENTRY32);
DWORD flag = 0;
CString theProcssName = "DBA_BJLDNW.exe";
//列舉進程
if(::Process32First(hProcessSnap,&pe32)){
do{
if(!theProcssName.CompareNoCase(pe32.szExeFile)){
flag = 1;
break;
}
}
while(Process32Next(hProcessSnap,&pe32));
}
::CloseHandle(hProcessSnap);
if(!flag){ //如果沒有找到
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 ;
}
//開啟使用者的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 ;
}
//開啟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 被重啟動";
LogEvent(msg);
SetProcessWindowStation(hwinstaCurrent);
SetThreadDesktop(hdeskCurrent);
CloseWindowStation(hwinsta);
CloseDesktop(hdesk);
}