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Really Annoying Error - Fixed

Started by programmermattc Sep 27, 2006 at 4:20 PM 3 replies 1.3k views

Original Post

Sep 27, 2006 at 4:20 PM

I've been getting this error since typing this code in that I've had working before: main.obj : error LNK2019: unresolved external symbol __imp__UnregisterClassA@8 referenced in function "bool __cdecl UnregisterWindowClasses(struct HINSTANCE__ *)" (?UnregisterWindowClasses@@YA_NPAUHINSTANCE__@@@Z) UnregisterWindowClass is a function of my own. It wouldn't be such a big problem but I'm getting it 10 different times on other functions like RegisterClass, etc... It's definately possible I don't have something linked right in C++ Express Edition because last time I compiled it in the older C++ compiler. I linked it enough so Windows.h wouldn't error but I think it's not finding these basic Windows functions. I already tried deleting the .obj and recompiling. Any ideas? [Edited by - programmermattc on September 27, 2006 5:01:01 PM]

TrueTom

Sep 27, 2006 at 4:42 PM

Don't use function names that are already defined in windows.h. If you have to use the names, #undefine them.

programmermattc

Sep 27, 2006 at 4:47 PM

I'm not, I'm using the predefined RegisterClass inside my RegisterWindowClasses() and the error is saying that using that predefined func in my own is wrong. (Sorry it sounded kind of like I named it RegisterClass)

Red Ant

Sep 28, 2006 at 3:22 AM

Are you sure your project is set up as a Win32 application? AFAIK the compiler won't know to link against the Windows libraries if the project is merely set up as a console application.

P.S. Oops never mind, I didn't see the FIXED in the thread title. =0

programmermattc

Sep 28, 2006 at 9:02 AM

Thats ok, I had started my application as a blank project and tried to include it without adding this reallyl ong line of Additional Dependencies to a file located somewhere within C++'s folders. Basically I didn't read far enough of the 'Do this with the SDK' that MS has up on their site.

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