DLL Exports

[ExciteMouse]

I am making a Win32 DLL. I want my DLL to export the same symbols as another DLL made by someone else. In their DLL their exports look like so:

___TSAFDIsSet@8
_t_accept@12
_t_bind@12
_t_closesocket@4
_t_connect@12
_t_gethostbyaddr@12
_t_gethostbyname@4


Now when i add a .def file to my project, i add the exports just as how they have them, but the compiler says that the ordinal can not sit next to the export name so i have to do this:

___TSAFDIsSet @8
_t_accept @12
_t_bind @12
_t_closesocket @4
_t_connect @12
_t_gethostbyaddr @12
_t_gethostbyname @4


But, then when i compile it, it throws a fit that i used the same ordinal number twice. Plus if i use the spaces between the export name and ordinal number, the "@num" doesnt show up in its export table. The calls have to match perfectly though!

So my question is, how the heck did the person who made this DLL get the exports in this format, and how did this person use the same ordinal number in multiple exports?

i am using Microsoft Visual C++ 6.0

thanks

[Yonatan]

Let's say the function's name in the code is MyFakeConnectFunction, and you want the export symbol to be _t_connect@12...
In that case, try this for your .DEF file:

EXPORTS
_t_connect@12=MyFakeConnectFunction

Note: I'm not sure about the syntax, it might require "quotation marks" in some places such as:

EXPORTS
"_t_connect@12"="MyFakeConnectFunction"

But then again, it might not. Test and find out

And regarding your other question: In this case the @ does not specify an ordinal number. It is part of what Microsoft likes to call "function name decoration".

[ExciteMouse]

thanks for the reply.. it *does* change the name.. if i do this:

_t_connect@12=MyFakeConnectFunction


BUT, the export after its compiled is this:

_t_connect

it drops everything after the '@' char. like this:

_t_connect@doiexist=MyFakeConnectFunction

will show like this:

_t_connect

in a export viewer.. i even tried loadlibrary and getprocaddress to make sure, and i can only access the function by calling "_t_connect" even with the export defined as "_t_connect@12" or "_t_connect@doiexist"

any other ideas? man this is odd

oh yeah, and i did try using quotes in every possible way

[parksie]

Welcome to the wonderful world of name mangling

_name@size is the standard calling convention name style. "name" is the function name, and "size" is the parameter size in bytes:

int func(int x, short y);

_func@6 (I think ). If you don't use a .DEF file they're exported like this, otherwise the linker rewrites the external names for you.