visual studio building error: unresolved external symbol _IID_IWICImagingFactory (MFC static lib)

Question

I wrote a porgram with a few standard dialogs in an SDI (Doc/View enabled) project.

Now that I want to send it to some friends i did set the Use of MFC Use MFC in a static library.

But when i try to build the solution i get the following error:

error LNK2001: unresolved external symbol _IID_IWICImagingFactory

My problem is, that i don´t know what exactly this interface id is, because i did not write any code for COM manually or using any image factory things or equal...

Im a bit lost atm...

May anyone tell me how to solve this and make it work with the static MFC usage?

Thanks in advance!

Answer 1

IWICImagingFactory is defined in wincodec.idl

• Locate and add wincodec.idl to your MFC project
• Rebuild and MIDL compiler will generate wincodec_i.c and wincodec_i.h
• wincodec_i.* files contain the declaration and definition of _IID_IWICImagingFactory

Answer 2

There is also a .lib file:

C:\Program Files\Microsoft SDKs\Windows\v7.0A\Lib\ windowscodecs.lib

Answer 3

This wasn't my exact problem (different .idl), but same linker error. Google found your question anyway. I copied the .idl file out to a new directory, launched a VS command line, and ran this:

midl thefile.idl

After it made my .c file, I just copied the const for the IID that I needed, and threw away the rest.