C++ Loading a DLL

Question

I'm about to develop a API that should be distributed with a DLL. Because I can't test my code written in the DLL directly, I have to load the DLL within a Test-Project and run it there.

I'm using Visual Studios 2015. There I made a Testproject and within that, I made my Project for the DLL:

Solution-Tree "TestProject"

• DLLProject

• TestProject

I export a dummy function to test if I am able to load the DLL:

#ifndef EXPORT
#define EXPORT __declspec(dllexport)
#endif

extern "C" {
    EXPORT int dummy() {
        return 5;
    }
}

Then, in my Testproject, I try to load the DLL, extract the function and run it:

#include <windows.h>
#include <iostream>
using namespace std;

typedef int (__stdcall *dll_func)();

int main() {
    HINSTANCE hGetProcIDDLL = LoadLibrary(TEXT("H:\\path\\to\\project\\Debug\\DLLProject\\DLLProject.dll"));

    if (hGetProcIDDLL == NULL) {
        cout << "DLL could not be loaded. " << GetLastError() << endl;
        return;
    }

    dll_func f = (dll_func)GetProcAddress(hGetProcIDDLL, "create");

    if (f == NULL) {
        cout << "Factory function could not be resolved. " << GetLastError() << endl;
        return;
    }

    cout << "Factory function returns: " << f() << endl;
}

I copied almost everything from this question . Unfortunately, when I run my Testproject, my console prints out: "DLL could not be loaded. 4250"

At this point I really don't know what to do because the Error as described here basicly says nothing. With a bit of research, I couldn't get any answers... hope you can help me :D

Answer 1

This is likely caused by linker settings. Make sure you specify "/APPCONTAINER:NO" in the linker settings.