convert x86 to x64 the linking error(2019) occure

Question

I have a project in vc++ which using standerd windows library and source file include file1.h.A method in header file defind as

file1.h

void _stdcall fun(char * text);

but the plateform was the x86 and vc6.Now I converted the project in vs8.and plateform x64.I also add the file1.lib file in x64 plateform.But when I execute the project the error occure that

error LNK2019: unresolved external symbol fun referenced in function main

Answer 1

as @Hans said, you need to recompile everything to work with x64 (if its not x64 already), this is due to the fact that x64 has a different ABI, thus the name decoration of symbols changes, hence your error.