I'm trying to use a COM library that makes use of a vtable. However, something funky is going on with the stack after I call the functions, which tells me I'm doing something wrong.
The header file with the vtable definition is pasted here: pastebin.com/m2d66c18c (see in particular the code starting at line 810). An example is pasted here: pastebin.com/m1b46e662.
The table is being filled with the correct locations for the functions, but when I call the function(s), they appear to be looking in the wrong locations for the arguments on the stack. Also, after calling the functions in the table, the stack is messed up and my program crashes. I've tried changing the function type to both __cdecl and __stdcall but this does nothing.
It's either my code or the library, and the company that wrote the library hasn't gotten back to me -- because it's the weekend, I'm assuming. Also, there is a demo application that utilizes the library, and it works -- so I think it's my code/compiler (gcc)/something else, not the library.
Could it be that there something in particular that you need to do in order to use a COM library?