EventGhost

Posted: **Sat May 26, 2012 3:26 am**

I was looking at attempting to suspend / resume my Windows Media Center and XBMC - but since I use 2 monitors and it will not work properly for me - I tested with pssuspend.exe

In my search I ran across some python code. I have not tested this code but I thought I'd post it in case others wanted to try it and/or make a plugin, this would be very useful for others.

If you test, let us know how it goes.

SUSPEND

Code: Select all

function SuspendProcess(PID:DWORD):Boolean;
 var
 hSnap:  THandle;
 THR32:  THREADENTRY32;
 hOpen:  THandle;
 begin
   Result := FALSE;
   hSnap := CreateToolhelp32Snapshot(TH32CS_SNAPTHREAD, 0);
   if hSnap <> INVALID_HANDLE_VALUE then
   begin
     THR32.dwSize := SizeOf(THR32);
     Thread32First(hSnap, THR32);
     repeat
       if THR32.th32OwnerProcessID = PID then
       begin
         hOpen := OpenThread($0002, FALSE, THR32.th32ThreadID);
         if hOpen <> INVALID_HANDLE_VALUE then
         begin
           Result := TRUE;
           SuspendThread(hOpen);
           CloseHandle(hOpen);
         end;
       end;
     until Thread32Next(hSnap, THR32) = FALSE;
     CloseHandle(hSnap);
   end;
 end;

RESUME

Code: Select all

function ResumeProcess(ProcessID: DWORD): Boolean;
 var
   Snapshot,cThr: DWORD;
   ThrHandle: THandle;
   Thread:TThreadEntry32;
 begin
   Result := False;
   cThr := GetCurrentThreadId;
   Snapshot := CreateToolhelp32Snapshot(TH32CS_SNAPTHREAD, 0);
   if Snapshot <> INVALID_HANDLE_VALUE then
    begin
     Thread.dwSize := SizeOf(TThreadEntry32);
     if Thread32First(Snapshot, Thread) then
      repeat
       if (Thread.th32ThreadID <> cThr) and (Thread.th32OwnerProcessID = ProcessID) then
        begin
         ThrHandle := OpenThread(THREAD_ALL_ACCESS, false, Thread.th32ThreadID);
         if ThrHandle = 0 then Exit;
         ResumeThread(ThrHandle);
         CloseHandle(ThrHandle);
        end;
      until not Thread32Next(Snapshot, Thread);
      Result := CloseHandle(Snapshot);
     end;
 end;




The SuspendProcess and ResumeProcess wrappers from the following code are now functions and returns True if succeed, False otherwise.


type
  NTSTATUS = LongInt;
  TProcFunction = function(ProcHandle: THandle): NTSTATUS; stdcall;

const
  STATUS_SUCCESS = $00000000;
  PROCESS_SUSPEND_RESUME = $0800;

function SuspendProcess(const PID: DWORD): Boolean;
var
  LibHandle: THandle;
  ProcHandle: THandle;
  NtSuspendProcess: TProcFunction;
begin
  Result := False;
  LibHandle := SafeLoadLibrary('ntdll.dll');
  if LibHandle <> 0 then
  try
    @NtSuspendProcess := GetProcAddress(LibHandle, 'NtSuspendProcess');
    if @NtSuspendProcess <> nil then
    begin
      ProcHandle := OpenProcess(PROCESS_SUSPEND_RESUME, False, PID);
      if ProcHandle <> 0 then
      try
        Result := NtSuspendProcess(ProcHandle) = STATUS_SUCCESS;
      finally
        CloseHandle(ProcHandle);
      end;
    end;
  finally
    FreeLibrary(LibHandle);
  end;
end;

And another set...

The SuspendProcess and ResumeProcess wrappers from the following code are now functions and returns True if succeed, False otherwise.

Code: Select all

type
  NTSTATUS = LongInt;
  TProcFunction = function(ProcHandle: THandle): NTSTATUS; stdcall;

const
  STATUS_SUCCESS = $00000000;
  PROCESS_SUSPEND_RESUME = $0800;

function SuspendProcess(const PID: DWORD): Boolean;
var
  LibHandle: THandle;
  ProcHandle: THandle;
  NtSuspendProcess: TProcFunction;
begin
  Result := False;
  LibHandle := SafeLoadLibrary('ntdll.dll');
  if LibHandle <> 0 then
  try
    @NtSuspendProcess := GetProcAddress(LibHandle, 'NtSuspendProcess');
    if @NtSuspendProcess <> nil then
    begin
      ProcHandle := OpenProcess(PROCESS_SUSPEND_RESUME, False, PID);
      if ProcHandle <> 0 then
      try
        Result := NtSuspendProcess(ProcHandle) = STATUS_SUCCESS;
      finally
        CloseHandle(ProcHandle);
      end;
    end;
  finally
    FreeLibrary(LibHandle);
  end;
end;

function ResumeProcess(const PID: DWORD): Boolean;
var
  LibHandle: THandle;
  ProcHandle: THandle;
  NtResumeProcess: TProcFunction;
begin
  Result := False;
  LibHandle := SafeLoadLibrary('ntdll.dll');
  if LibHandle <> 0 then
  try
    @NtResumeProcess := GetProcAddress(LibHandle, 'NtResumeProcess');
    if @NtResumeProcess <> nil then
    begin
      ProcHandle := OpenProcess(PROCESS_SUSPEND_RESUME, False, PID);
      if ProcHandle <> 0 then
      try
        Result := NtResumeProcess(ProcHandle) = STATUS_SUCCESS;
      finally
        CloseHandle(ProcHandle);
      end;
    end;
  finally
    FreeLibrary(LibHandle);
  end;
end;

Posted: **Mon Jul 02, 2012 7:31 am**

I recommend a look at this:
http://www.codeproject.com/Articles/296 ... esume-tool

Pako

Posted: **Mon Jul 02, 2012 2:35 pm**

Pako wrote:I recommend a look at this:
http://www.codeproject.com/Articles/296 ... esume-tool

Pako

that code is 10 years old, though it still might work on Win7, I don't want to mess with it. A few comments there mention there are built-in functions in windows that do the same thing...

NTSTATUS NTAPI NtResumeProcess(IN HANDLE ProcessHandle)
NTSTATUS NTAPI NtSuspendProcess(IN HANDLE ProcessHandle)

... I suspect this is what pssuspend.exe uses.

I will likely try pssuspend.exe again.

EventGhost

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