VC + + based on Explorer.exe process to detect whether the user has logged in

Here is a VC + + according to the Explorer.exe process to detect whether the user has logged in, I hope the example can help you.

code is as follows

&nbs P;

void CALLBACK Timecall (UINT Timeid, UINT umsg, Dword_ptr Dwuser, D WORD dw1, dword_ptr dw2) {  dword Dwsessionid = Wtsgetactiveconsolesessionid ();     & nbsp;  //Get the console session  handle Hsnap = createtoolhelp32snapshot (th32cs_snapprocess, 0);    /To create an environment snapshot  if (hsnap = = invalid_handle_value)   return;  //traverses the snapshot, obtains the application name through the snapshot's procentry.szexefile, and obtains the corresponding PID  processentry32 procentry;   procentry.dwsize = sizeof (PROCESSENTRY32);  process32first (Hsnap, &procentry);  dword dwexplorerpid =-1;  do  {   if (strcmp (Procentry.szexefile, "explorer.exe") = 0)   { & Nbsp;  dword dwexplorersessid = 0;   &Nbsp;if (Processidtosessionid (Procentry.th32processid, &dwexplorersessid) && Dwexplorersessid = = Dwsessionid)    {     dwexplorerpid = procentry.th32processid;     break;    }   }  } while (Process32Next (Hsnap, &procentry));  log_info ("detect if the user is logged on:%s", (dwexplorerpid = = 1)? "Not logged in": "Already logged in");  if (dwexplorerpid!=-1)  {   //logged in   dosomething ();  } }< /p>