What does err.lastdllerror 87 mean after OpenProcess(PROCESS_QUERY_LIMITED_INFORMATIO

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.

Code:

---

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!

87 The parameter is incorrect. ERROR_INVALID_PARAMETER

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

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

This one has been running fine for me

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