Problem to call a DLL in 64bits that is working in 32bits in C++

We have a DLL that is woking fine in 32bits but when we compile it in 64bits and we call it we face a problem. We want to solve it. We dinamically load the DLL and call to typedef int (__stdcall GetIdcInfo)(char gameid, char token, char * iduserIDC, char * userToken, char * currency, char * language, char* country); it shpuld work in 32 bits and 64 bits... we need this example to work in 64 bits and a working example in C++ loading this DLL and executing it. We have done it with Visual Studio 2012, so anyone similar would be apreciated