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DllLoader.cpp

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 v0_0_2

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DllLoader.cpp

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#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\\Debug\\SampleDLL.dll"

void LoadFromFile(void)

{

addNumberProc addNumber;

HINSTANCE handle = LoadLibrary(DLL_FILE);

if (handle == INVALID_HANDLE_VALUE)

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;

}