How to porting from windows to linux?

I am on a porting project, porting from windows to linux.

Can anybody told me what difference from vc++ to gcc in linux .

That depends on libraries you have used in VC++.
If you just wrote an ANSI C++ code then there is no problem with porting it to any ANSI compiler, such as GCC. But that's of very low probablity that some one write a big code wich can be port for the first time to any platform.

So tell us wich libraries you have used? Is it a MFC app? .NET? etc.

We didn't used MFC or .net, only windows api.
But used some windows special character, like thread.

I never programming on Linux, so want to know where can I find a developing guid document which describe difference between c++ in windows and linux.

Thanks a lot.

Go here and you will know about programming in Linux ...

http://www.advancedlinuxprogramming.com/alp-folder

Which VC and which gcc?

For example (and these are off the top of my head as issues that have affected me) VC6 has the for-scope problem, VC7 must have inner template classes defined inline, numeric_limits didn't appear until gcc3 ...

And how much of the windows api? Lots of windows and COM objects or are you just using structures like BITMAP?

Maybe you should consider running the application through wine http://www.winehq.com/ or more specifically using winelib, seeing as you skipped the MFC (I don't blame you) - http://www.winehq.org/site/docs/winelib-user/index ?

I think that you can find a portable thread library at http://www.boost.org - I haven't used this library myself but their other stuff has been pretty useful.

thanks a lot, you are really good man, dakensta.