problem with unicode and files

[skval]

I'm trying to read data from file into a Unicode string, and even though that according to dwRead ,
it does read bytes from the file, the szUnicode string is still empty.
here is the code:

wchar_t *getFile(char *fname)
{
	HANDLE hFile=CreateFile(fname,
		GENERIC_READ,
		FILE_SHARE_READ,
		NULL,
		OPEN_EXISTING,
		NULL,
		NULL);
	int num;
	wchar_t *szUnicode;
	DWORD dwRead;

	if(hFile==INVALID_HANDLE_VALUE)
		return NULL;

	num=GetFileSize(hFile,NULL);
	szUnicode=(wchar_t*)malloc(sizeof(wchar_t) * num);
	
	ReadFile(hFile,(LPVOID)szUnicode,num,&dwRead,NULL);
	wprintf(szUnicode);
	CloseHandle(hFile);

	return szUnicode;
}

anyone has any idea?
thanks in advance.