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OpenProcess returns access_denied on 64 bit platform

I have a function:

HANDLE snapshot=CreateToolhelp32Snapshot(TH32CS_SNAPPROCESS, 0);

...

result=Process32First(snapshot,&pe);
while(result) {
  if(!_stricmp(process_name,pe.szExeFile)) {
    processes.push_back(pe.th32ProcessID);
  }
  result=Process32Next(snapshot,&pe);
}

for(dword_vector::iterator i=processes.begin(); i!=processes.end(); ++i){
  HANDLE hProcess=OpenProcess(PROCESS_TERMINATE, FALSE, *i);
  if(hProcess) {
    TerminateProcess(hProcess, 0);
    CloseHandle(hProcess);
  }
}

It works fine on 32-bit platform, but on 64-bit platform OpenProcess returns Access_denied for some processes (the same processes on a 32-bit basis can be computed fine). All processes I try to open are 32bit.

What could be the problem?

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3 answers


Could it be that the user you registered on the 64-bit platform does not have the right to terminate these processes? for example, on Vista, UAC is active, you are an administrator but not promoting and trying to close system processes.



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It may be valid, but are you executing the code from the network disk ? I've seen .NET applications fail to do very simple things when launched from a network drive.

If so, try moving the executable to your local drive and see if that helps.



Yes, I know this is a very strange suggestion, I just think this problem might help :-)

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Is your application a 64-bit process or a 32-bit process? You cannot open a 64 bit process from a 32 bit process.

Use Task Manager to make sure your application is 64-bit. If not, fix and compile it as 64-bit and you can open other 64-bit processes and 32-bit processes.

If your application is 32-bit it is probably a permissions issue. Try running it as administrator and see if that fixes the problem.

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