[ctypes-users] accessing dll ordinals using ctypes

[Karl S. <de...@gm...>]

I'm trying to use a function inside of a dll, but it doesn't allow me
to use the name, just the ordinal number. I've got this so far, but
everytime I try and use the function it states that there's an access
violation at 0x00000000.

from ctypes import *

Qtcore4 = windll.LoadLibrary("C:\\Program Files\\fg 5.1\\bin\\Qtcore4.dll")
openFile = windll.Qtcore4[0x9B6]
openFile("C:\\Documents and
Settings\\Administrator\\Desktop\\file.fdr") <<this line causes the
error.

I'm fairly certain I'm not doing it properly. I found the ordinal
number by using CFF Explorer and reverse engineering the binary that
uses the function. It's just a bit confusing converting it into object
oriented programming from what I see when I reverse it and then into
python (if you get what I mean).

C++ example:

        QFile f1( "/tmp/data.bin" );
        f1.open( IO_Raw | IO_ReadWrite );

        QFile f2( "readme.txt" );
        f2.open( IO_ReadOnly | IO_Translate );

        QFile f3( "audit.log" );
        f3.open( IO_WriteOnly | IO_Append );

How many arguments does open take? And how would I represent this in
python ctypes?

Thanks in advance.


-- 
K Smith @ Edinburgh