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copied!<p>@RRUZ has already answered an <a href="https://stackoverflow.com/questions/1857037/determine-the-parent-process-of-the-current-app">almost identical question</a> on Stack Overflow. However, the code there is incorrect in that it declares process IDs as <code>THandle</code>. The following corrects the mistakes that I found, and also adapts the routine to return a PID rather than a filename:</p> <pre><code>uses Windows, tlhelp32, SysUtils; function GetParentPid: DWORD; var HandleSnapShot: THandle; EntryParentProc: TProcessEntry32; CurrentProcessId: DWORD; HandleParentProc: THandle; ParentProcessId: DWORD; begin Result := 0; HandleSnapShot := CreateToolhelp32Snapshot(TH32CS_SNAPPROCESS, 0); //enumerate the process if HandleSnapShot<>INVALID_HANDLE_VALUE then begin EntryParentProc.dwSize := SizeOf(EntryParentProc); if Process32First(HandleSnapShot, EntryParentProc) then //find the first process begin CurrentProcessId := GetCurrentProcessId; //get the id of the current process repeat if EntryParentProc.th32ProcessID=CurrentProcessId then begin ParentProcessId := EntryParentProc.th32ParentProcessID; //get the id of the parent process HandleParentProc := OpenProcess(PROCESS_QUERY_INFORMATION or PROCESS_VM_READ, False, ParentProcessId); if HandleParentProc<>0 then begin Result := ParentProcessId; CloseHandle(HandleParentProc); end; break; end; until not Process32Next(HandleSnapShot, EntryParentProc); end; CloseHandle(HandleSnapShot); end; end; </code></pre> <p>I know that this is a duplicate question, but the code here is precisely what the OP wants, so I'll leave it visible for a while at least.</p>

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