What does err.lastdllerror 87 mean after OpenProcess(PROCESS_QUERY_LIMITED_INFORMATIO

[tmighty2]

Hello!

I am running the following code to find out the name of a process from a process ID.

However, hProcess is always 0, and Err.LastDLLError is 87.

Public Function GetExePathFromProcessID(ByVal idProc As Long) As String

    Dim sBuf As String
    Dim sChar As Long, l As Long, hProcess As Long
    hProcess = OpenProcess(PROCESS_QUERY_LIMITED_INFORMATION, 0, idProc)  ' Or PROCESS_VM_READ or would only work if admin!
    If hProcess Then
        sBuf = VBA.String(260, vbNullChar)
        sChar = GetProcessImageFileName(hProcess, sBuf, 260)
        
        Debug.Assert False 'todo
      
        CloseHandle hProcess
    Else
        Dim lErr&
        lErr = Err.LastDLLError
        Debug.Print lErr
    End If
    
End Function

What does this error code mean?

Thank you!

[dilettante]

87 The parameter is incorrect. ERROR_INVALID_PARAMETER

[wqweto]

Start Command Prompt and type “net helpmsg 87” without the quotes.

[tmighty2]

Thank you. It seems to occur if idProc does not point to an existing process id.

[dz32]

This one has been running fine for me

https://github.com/dzzie/libs/blob/b...sInfo.cls#L833