How to get the Instance Handle from a Process ID？

[Billypon]

How could I get the Instance Handle from another Process ID? Maybe the Process has no any windows, so I can't use the GetWindowLong API. And I know nothing about the Module Name of the third Process, so I can't use the GetModuleHandle API,too. So,how could I get the Instance Handle from another Process ID?Or how could I get the Module Name of the third Process,that I can use the GetModuleHandle API for it?

[Nibu babu thomas]

Billypon wrote:

How could I get the Instance Handle from another Process ID?

Use OpenProcess API.

HANDLE hProcHandle = ::OpenProcess( PROCESS_ALL_ACCESS, FALSE, dwAnotherProcessID );
ASSERT( hProcHandle );

The first parameter specifies type of access needed. PROCESS_ALL_ACCESS won't always work. The type of action that you want to take on the remote process will determine the access needed. For eg: to terminate a process you will need PROCESS_TERMINATE access right or for ReadProcessMemory and WriteProcessMemory PROCESS_VM_**** rights. It's safe to have the SeDebugPrivilege enabled for your application if would like to do some advanced stuff with the other process. You might be interested to look up this article -> http://www.codeproject.com/useritems/processviewer.asp[^]

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Nibu thomas A Developer Code must be written to be read, not by the compiler, but by another human being. http:\\nibuthomas.wordpress.com