未解析的外部符号（仍在发生）

Question

When building my application in Debug mode: The build works. The application works. When building my application in Release mode, I get the following error message

error LNK2019: unresolved external symbol __imp__GetClassNameA@12 referenced in function _eachWindow@8

All implementation files of my application have a .c extension; that however doesn't mean I would know which compiler is used by visual studio.

From the documentation of GetClassNameA I can see that a library User32.lib is required. I have found a library with that name in

C:\\Program Files\\Microsoft SDKs\\Windows\\v7.1\\Lib>

I have added that directory to the property pages:

Configuration Properties > Linker > General > Additional Library Directories

but that did not help. I am still receiving that error message.

Thanks for help. I know this question has been asked before, but the previous answers did not help me. Please help in baby steps, I am still overwhelmed by Windows programming.

Answer 1

Does _eachWindow call GetClassName? Then you need to link user32.lib . Check the additional dependencies in the project's linker settings, not the additional library directories . – dxiv

dxiv's comment … makes the application work. – chris j