error LNK2019: unresolved external symbol

[bankai123]

Hi, I've recently opened a vc6 MFC project into vs2005 and let it do the conversions. The code would compile fine. Next I added a class called AviFile(Creating Movie from HBitmap on Codeproject) to the project which I assume is just using win32 API. However when I try to compile, I get his error message. 1>AviFile.obj : error LNK2019: unresolved external symbol _AVIFileInit@0 referenced in function "public: __thiscall CAviFile::CAviFile(char const *,unsigned long,unsigned long)" (??0CAviFile@@QAE@PBDKK@Z) 1>AviFile.obj : error LNK2019: unresolved external symbol _AVIFileExit@0 referenced in function "public: __thiscall CAviFile::~CAviFile(void)" (??1CAviFile@@QAE@XZ) 1>AviFile.obj : error LNK2019: unresolved external symbol _AVIFileRelease@4 referenced in function "private: void __thiscall CAviFile::ReleaseMemory(void)" (?ReleaseMemory@CAviFile@@AAEXXZ) ...etc I think there's something wrong with the linker settings, but I can't quite figure it out. I've googled for possible solutions, but still no luck. Does anyone have an idea? Thanks

[toxcct]

the compiler probably doesn't find the related .lib file into which those symbols are defined...

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[Rajkumar R]

link it with Vfw32.lib.

[Naveen]

specify the Vfw32.lib in the "object/library modules"( project settings->Link ) of your project settings.

nave [OpenedFileFinder]

[bankai123]

The AviFile class doesn't use the Vfw32.lib library, but uses vfw.h. I'm using Visual Studio 2005, so would "object/library modules" be the Additional Library Directories? Thanks

[Naveen]

bankai123 wrote:

The AviFile class doesn't use the Vfw32.lib library, but uses vfw.h.

Vfw32.lib will be having the link information for that functions.

bankai123 wrote:

I'm using Visual Studio 2005

I dont have VS2005 now. How ever it is not Additional Library Directories.

nave [OpenedFileFinder]

[Rajkumar R]

Hi, you may included vfw.h so you didn't get compilation error. you got link error, find the option for linking corresponding to your IDE, VS2005 needs to add vfw32.lib to project-><name>property->configuation property->linker->Input->Additional Dependency field.

[Cedric Moonen]

bankai123 wrote:

The AviFile class doesn't use the Vfw32.lib library, but uses vfw.h.

The header file only contains the class declaration. From where do you think the implementation of the methods comes from ? Bingo, from the library file ;). In visual studio 2005, go into "Project Properties" -> "Linker" -> "Input" and specify the library in "Additional Dependencies".

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Cédric Moonen Software developer
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[bankai123]

Thanks for that, that solution solved the linker problem. Now I seem to get this error LINK : fatal error LNK1104: cannot open file 'C:\Program.obj' Is this a problem with my directory path I specified? Which was C:\Program Files\Microsoft Visual Studio 8\VC\PlatformSDK\Lib

[Rajkumar R]

when you add vfw32.lib does the field already had other libs, if so donot put commas in between only spaces or add it using IDE as seperate entry. also for long path having spaces c:/program files use "c:/program files" include it in quotes Best Regards

[bankai123]

Thanks for the help!:laugh: I forgot the quotes, the directory path should be in Dos 8.3 format, am I correct? Oh well, thanks, all is working now. -- modified at 7:58 Friday 1st June, 2007