.NET : How to PInvoke UpdateProcThreadAttribute

Question

I am trying to PInvoke UpdateProcThreadAttribute() on Windows 7 but my attempts just keep returning FALSE with a Last Win32 Error of 50.

Functio         


        

Answer 1

You have a few problems with your declaration but the one that is giving you the not supported error is the Attribute parameter. A DWORD_PTR is not a pointer but rather a pointer sized unsigned integer so rather than ref uint it should be an IntPtr.

The declaration I would use is:

    [DllImport("kernel32.dll", SetLastError = true)]
    [return: MarshalAs(UnmanagedType.Bool)]
    private static extern bool UpdateProcThreadAttribute(
        IntPtr lpAttributeList, uint dwFlags, IntPtr Attribute,
        IntPtr lpValue, IntPtr cbSize, IntPtr lpPreviousValue, 
        IntPtr lpReturnSize);

EDIT:

I tried to do this as a comment but it doesn't take to code very well.

For a process handle you need an IntPtr to hold the handle. So you would need something like:

IntPtr hProcess //previously retrieved.
IntPtr lpAttributeList //previously allocated using InitializeProcThreadAttributeList and Marshal.AllocHGlobal.

const int PROC_THREAD_ATTRIBUTE_PARENT_PROCESS = 0x00020000;
IntPtr lpValue = Marshal.AllocHGlobal(IntPtr.Size); 
Marshal.WriteIntPtr(lpValue, hProcess);
if(UpdateProcThreadAttribute(lpAttributeList, 0, (IntPtr)PROC_THREAD_ATTRIBUTE_PARENT_PROCESS, lpValue, (IntPtr)IntPtr.Size, IntPtr.Zero, IntPtr.Zero))
{
    //do something
}

//Free lpValue only after the lpAttributeList is deleted.