把文件读到内存中然后使用内存加载

分两种方式实现C++和C

int read_dll_memory_load (TCHAR str_dll_path[],char str_export_fun[]) //用C++的方式把文件读到内存加载
{  
	filebuf *pbuf;  
	ifstream filestr;  
	long size;  
	char * buffer;  

	filestr.open (str_dll_path, ios::binary); // 要读入整个文件，必须采用二进制打开  

	pbuf=filestr.rdbuf(); // 获取filestr对应buffer对象的指针   

	size=pbuf->pubseekoff (0,ios::end,ios::in);  // 调用buffer对象方法获取文件大小 
	pbuf->pubseekpos (0,ios::in);  

	buffer=new char[size];  // 分配内存空间 

	pbuf->sgetn (buffer,size);  // 获取文件内容 

	filestr.close();  

	HMEMORYMODULE module=MemoryLoadLibrary(buffer);//从内存中加载文件

	FARPROC mc=MemoryGetProcAddress(module, str_export_fun);

	if (mc==NULL)
	{
		OutputDebugStringA("MemoryGetProcAddress NULL");

		return 0;
	}

	typedef int (WINAPI* FN_Execute) (int nType);

	FN_Execute execute=(FN_Execute)mc;

	execute(0);

	MemoryFreeLibrary(module);

	delete []buffer;  

	return 0;  
}

UINT read_dll_memory_load_c(TCHAR str_dll_path[],char str_export_fun[])
{
	HANDLE hFile = CreateFile(str_dll_path, GENERIC_READ , 0, NULL,OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);

	if (hFile==NULL||hFile==INVALID_HANDLE_VALUE)
	{
		return 0;
	}

	DWORD  dwFileSize= 0;

	dwFileSize=GetFileSize(hFile,  NULL);

	CloseHandle(hFile);

	char * buff=new char[dwFileSize];

	FILE* fp = _tfopen(str_dll_path, _T("rb"));

	if (fp)
	{
		dwFileSize=fread(buff, 1, dwFileSize, fp);
	}

	fclose(fp);


	HMEMORYMODULE hm=MemoryLoadLibrary(buff);

	if (hm==NULL)
	{
		return 0;
	}

	FARPROC mc=MemoryGetProcAddress(hm, str_export_fun);

	if (mc==NULL)
	{
		OutputDebugStringA("MemoryGetProcAddress NULL");

		return 0;
	}

	typedef int (WINAPI* FN_Execute) (int nType);

	FN_Execute execute=(FN_Execute)mc;

	execute(0);

	MemoryFreeLibrary(hm);

	delete []buff;  

	return 0;
}