MemoryModule/example/DllLoader/DllLoader.cpp

#define WIN32_LEAN_AND_MEAN

#include <windows.h>
#include <stdio.h>
#include <malloc.h>

#include "../../MemoryModule.h"

typedef int (*addNumberProc)(int, int);

#define DLL_FILE "..\\SampleDLL\\SampleDLL.dll"

void LoadFromFile(void)
{
    addNumberProc addNumber;
    HINSTANCE handle = LoadLibrary(DLL_FILE);
    if (handle == NULL)
        return;

    addNumber = (addNumberProc)GetProcAddress(handle, "addNumbers");
    printf("From file: %d\n", addNumber(1, 2));
    FreeLibrary(handle);
}

void LoadFromMemory(void)
{
    FILE *fp;
    unsigned char *data=NULL;
    size_t size;
    HMEMORYMODULE module;
    addNumberProc addNumber;
    
    fp = fopen(DLL_FILE, "rb");
    if (fp == NULL)
    {
        printf("Can't open DLL file \"%s\".", DLL_FILE);
        goto exit;
    }

    fseek(fp, 0, SEEK_END);
    size = ftell(fp);
    data = (unsigned char *)malloc(size);
    fseek(fp, 0, SEEK_SET);
    fread(data, 1, size, fp);
    fclose(fp);

    module = MemoryLoadLibrary(data);
    if (module == NULL)
    {
        printf("Can't load library from memory.\n");
        goto exit;
    }

    addNumber = (addNumberProc)MemoryGetProcAddress(module, "addNumbers");
    printf("From memory: %d\n", addNumber(1, 2));
    MemoryFreeLibrary(module);

exit:
    if (data)
        free(data);
}

int main(int argc, char* argv[])
{
    LoadFromFile();
    printf("\n\n");
    LoadFromMemory();
    return 0;
}