Calling C Function in Dll Causing Problem

[Django_Untaken]

Hello there. I am trying to call a C function in my newly created Dll project's code. But doing so produces Unresolved External Symbol error. Here is the what I am trying

Header.h

int call_main(int argc, char** argv);

Header.cpp

int call_main(int argc, char** argv)
{
// all the code here .....
return 0;
}

Now I include this Header.h in my Dll's main file and try to call call_main. Building the project produces the said error.

#include "Header.h"

class Functions
{
public:
static __declspec(dllexport) int Call_MyMain(char **argv);
};

int Functions::Call_MyMain(char **argv)
{
return call_main(8, argv); // HERE I AM CALLING FROM ABOVE HEADER FILE
}

What could be wrong? What am I missing? Thanks for any input.

[Lost User]

You need to include the object module of header.cpp inside the build of your dll.

[Django_Untaken]

I don't know what does this mean? How do I do that?

[Albert Holguin]

...means your dll project should be building header.cpp... which produces an object file.

[Lost User]

You add it to the project just as you would any other module. See Walkthrough: Creating and Using a Dynamic Link Library (C++)[^].

[Django_Untaken]

It is building header.cpp and it also produces an object file

[Albert Holguin]

If you actually compiled one as C and the other as C++ (or the other way around), you'll also have to deal with name mangling... Standard C++[^] If they're both C++, it's actually still possible to screw up the mangling, I believe Studio allows you to set the mangling mode to each file independently (haven't used Studio in a while though). Decorated Names[^]

[mariakatosvich]

i think You need to include the object module of header.cpp inside the build of your dll.