Obtaining method address in C#

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In vb6 I used to use ObjPtr(functionname) to get the address of a method inside a class, is there some (low level or undocumented ok, but as direct [fast] a means as possible). The reason is I'd like to try and patch vtable and push some asm into the method..
As for Delegates, I did a test in this article:
http://www.codeproject.com/KB/audio-video/PWR.aspx
Turns out it takes delegate to RtlMoveMemory -10* longer- to move a byte array then a straight copy, (way too much idiot proofing in .Net). So.. delegates are out. Anything undocumented? Is there a way to get class address so I can try GetProcAddress?

thanks,
John

Posted 12-Jan-12 6:21am

John Underhill

Updated 12-Jan-12 8:39am

v4

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Kethu Sasikanth 12-Jan-12 13:29pm

Try unsafe in c#. I have seen samples getting data pointers using unsafe, but i think it's possible to get a function pointer too.

Sergey Alexandrovich Kryukov 12-Jan-12 13:53pm

Hm... :-) better not. No, don't do it. There are delegates, much superior to function pointers.
--SA

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John Underhill · Answer 1 · 2012-01-12T11:24:00

This gets me a handle (to something), but is probably too slow:

C#

private GCHandle _hndCompare;
private IntPtr _addCompare;

public Utils()
{
    Object mcmp = (Object)this.Compare("","");
    GCHandle _hndCompare = GCHandle.Alloc(mcmp, GCHandleType.Pinned);
    IntPtr _addCompare = _hndCompare.AddrOfPinnedObject();
}

public int Compare(string str1, string str2)
{
    int ret = 0;
    return ret;
}

~Utils()
{
    try
    {
        if (_hndCompare.IsAllocated)
        {
            _hndCompare.Free();
            _addCompare = IntPtr.Zero;
        }
    }
    catch { }
}

OriginalGriff · Answer 2 · 2012-01-12T06:36:00

Solution 1

Look at Delegates[^] - they are effectively function pointers under a different name, but with parameter type safety built in.

Posted 12-Jan-12 6:36am

OriginalGriff

Comments

Sergey Alexandrovich Kryukov 12-Jan-12 13:53pm

Well, basically... a 5.
--SA

Wonde Tadesse 12-Jan-12 17:29pm

5+