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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
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.