• Announcements

    • khawk

      Download the Game Design and Indie Game Marketing Freebook   07/19/17

      GameDev.net and CRC Press have teamed up to bring a free ebook of content curated from top titles published by CRC Press. The freebook, Practices of Game Design & Indie Game Marketing, includes chapters from The Art of Game Design: A Book of Lenses, A Practical Guide to Indie Game Marketing, and An Architectural Approach to Level Design. The GameDev.net FreeBook is relevant to game designers, developers, and those interested in learning more about the challenges in game development. We know game development can be a tough discipline and business, so we picked several chapters from CRC Press titles that we thought would be of interest to you, the GameDev.net audience, in your journey to design, develop, and market your next game. The free ebook is available through CRC Press by clicking here. The Curated Books The Art of Game Design: A Book of Lenses, Second Edition, by Jesse Schell Presents 100+ sets of questions, or different lenses, for viewing a game’s design, encompassing diverse fields such as psychology, architecture, music, film, software engineering, theme park design, mathematics, anthropology, and more. Written by one of the world's top game designers, this book describes the deepest and most fundamental principles of game design, demonstrating how tactics used in board, card, and athletic games also work in video games. It provides practical instruction on creating world-class games that will be played again and again. View it here. A Practical Guide to Indie Game Marketing, by Joel Dreskin Marketing is an essential but too frequently overlooked or minimized component of the release plan for indie games. A Practical Guide to Indie Game Marketing provides you with the tools needed to build visibility and sell your indie games. With special focus on those developers with small budgets and limited staff and resources, this book is packed with tangible recommendations and techniques that you can put to use immediately. As a seasoned professional of the indie game arena, author Joel Dreskin gives you insight into practical, real-world experiences of marketing numerous successful games and also provides stories of the failures. View it here. An Architectural Approach to Level Design This is one of the first books to integrate architectural and spatial design theory with the field of level design. The book presents architectural techniques and theories for level designers to use in their own work. It connects architecture and level design in different ways that address the practical elements of how designers construct space and the experiential elements of how and why humans interact with this space. Throughout the text, readers learn skills for spatial layout, evoking emotion through gamespaces, and creating better levels through architectural theory. View it here. Learn more and download the ebook by clicking here. Did you know? GameDev.net and CRC Press also recently teamed up to bring GDNet+ Members up to a 20% discount on all CRC Press books. Learn more about this and other benefits here.
Sign in to follow this  
Followers 0
L. Spiro

FreeImage Linker Error in Visual Studio 2008

2 posts in this topic

I am trying to add FreeImage to LSEngine and have encountered linker errors.
I have posted the details here:
http://sourceforge.net/p/freeimage/discussion/36110/thread/fcf4b8a9/?limit=25#ff6a/a668
 
What you can take away from it:

  • The FreeImage static library is built with no errors and copied to a certain location as a post-build event.
  • I am correctly linking to that library, in 2 ways (and this is verified).
    • As an additional dependency.
    • As a project reference.
  • FreeImage_Initialise and FreeImage_DeInitialise are part of the library.  They are declared in FreeImage.h, defined in Plugin.cpp, and both files are part of the FreeImage static library project.
  • As per the second post there, I have copied the pre-defined macros from the FreeImage project to LSImageLib so that both projects see the headers exactly the same way.  This changed the error from __imp__FreeImage_Initialise@4 to _FreeImage_Initialise@4.
  • _FreeImage_Initialise is inside FreeImage.lib, _FreeImage_Initialise@4 is not.

Based on #4 and #5, it is simply a matter of decorations, but it was past my bedtime and I ran out of ideas to try.
Of note: In FreeImage.h, the functions are inside and extern "C" {} block but the definitions inside Plugin.cpp are compiled as C++.
What I have tried from there:

  • Made a file called Plugin.c and moved those function definitions into it (and added it to the project).
    • It never compiled the file for some reason.  I would click the file and tell it compile Plugin.c, but it would say, “Compiling Plugin.cpp…”.
    • The functions use new and delete, so they couldn’t compile to C anyway, even if Visual Studio did recognize it.
  • I moved the declarations out of the extern "C" {} block.
    • I got the same linker error but with a different mangling of the name.
  • I set FreeImage’s project settings to fully match those of LSImageLib’s, particularly including the default calling convention (which was set to __cdecl but LSImageLib has it set to __stdcall).
    • No change to the error.

I was simply too tired to continue and I couldn’t think of any more ideas to try.
It is clearly a name-mangling/decoration issue with a very tricky solution.
Any ideas appreciated.


L. Spiro

Edited by L. Spiro
0

Share this post


Link to post
Share on other sites
I can’t test but I believe I was so close but just barely missed it.
Linker Tools Error LNK2001
 
 

Interpreting the Output
When a symbol is unresolved, you can get information about the function by the following guidelines:
On x86 platforms, the calling convention decoration for names compiled in C, or for extern "C" names in C++, is:


__cdecl

Function has an underscore (_) prefix.


__stdcall

Function has an underscore (_) prefix and an @ suffix followed by the dword aligned size of parameters on the stack.


__fastcall

Function has an @ prefix and an @ suffix followed by the dword aligned size of parameters on the stack.


FreeImage.lib is compiling as __cdecl (even though as I mentioned I forced it in a few ways to compile as __stdcall) and LSImageLib defaults to using __stdcall.


This basically resolves the cause of the error, but since I have already told FreeImage to compile everything as __stdcall and I still get the same error I need to try a more brute-force approach to getting the calling conventions to match.


I don’t have the project with me now but I know for-sure that the reason is __cdecl inside FreeImage and __stdcall in my project, so I will definitely be able to solve it when I get back to it.


L. Spiro
0

Share this post


Link to post
Share on other sites
It’s not a surprise that if I had to resort to posting about a linker error that there was something suspicious happening in the first place.
https://sourceforge.net/p/freeimage/discussion/36110/thread/fcf4b8a9/#3159

It is literally impossible to build a static library of FreeImage. Its level of error is over 9,000.

Thank you for reading.


L. Spiro Edited by L. Spiro
0

Share this post


Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!


Register a new account

Sign in

Already have an account? Sign in here.


Sign In Now
Sign in to follow this  
Followers 0