TerminateProcess not working in Windows 7

I am writing an application in c++ on win7 platf开发者_运维知识库orm which needs to close another application. The steps I use are:

1. Enumerate all processes with EnumProcess().
2. Open a Process handle with OpenProcess(). The access rights are PROCESS_ALL_ACCESS|PROCESS_VM_READ.
3. Then enumerate process modules with EnumProcessModules()
4. I extract the module name with GetModuleBaseName() and compare it with the process name that I have.
5. When I find a match, I use TerminateProcess() to kill the process.

The problem I am facing is this works in WindowsXP but not in Windows 7(64 bit). Using getlasterror(), I get the error as "Access Denied". I guess it has something to do with access rights. Is there any way I can do this on both the platforms? Or is there an API specific to win7?

I had the same problem. Been looking very long for an answer and finally found it.

When you want to terminate another program you need a handle. A handle needs permissions to work with the other process. Terminating the process needs a specific permissions called PROCESS_TERMINATE. Use that when opening a handle for termination and it will probably work. It did for me, on Windows 7.

To sum things up, here the code you need to correctly use TerminateProcess. Handle with care ;)

Declare Function OpenProcess Lib "kernel32" ( _
    ByVal dwDesiredAccess As Long, _
    ByVal bInheritHandle As Long, _
    ByVal dwProcessID As Long) As Long
Declare Function TerminateProcess Lib "kernel32.dll" ( _
    ByVal ApphProcess As Long, _
    ByVal uExitCode As Long) As Long

Const PROCESS_TERMINATE = &H1

Private Sub KillProcess(ByVal ProcessID As Long)
    Dim pHandle As Long
    pHandle = OpenProcess(PROCESS_TERMINATE, 0, ProcessID)
    Call TerminateProcess(pHandle, 0)
End Sub

Are you running your program with Administrator privileges, and are you terminating processed of the same user?