ZeroRead.cpp

// ZeroRead.cpp : This file contains the 'main' function. Program execution begins and ends there.
//

#include <Windows.h>
#include <stdio.h>

void hexdump(unsigned char* p, DWORD len) {
	DWORD i;
	for (i = 0; i < len; i++) {

		if (i && !(i % 16)) {
			printf("\n"); fflush(stdout);
		}

		printf("%02X ", p[i]); fflush(stdout);

	}

	printf("\n");
	fflush(stdout);
	return;
}

int main() {

	HANDLE f;
	f = CreateFile(L"\\\\.\\Zero", GENERIC_READ | GENERIC_WRITE, 0, NULL, OPEN_EXISTING, 0, NULL);
	if (f == INVALID_HANDLE_VALUE) {
		printf("CreateFile() failed\n");
		exit(0);
	}

	DWORD bytes;
	char b[128];
	BOOL r = ReadFile(f, b, sizeof(b), &bytes, NULL);
	printf("r: %u\n", r);

	if (r != TRUE) {
		printf("ReadFile failed\n");
		exit(0);
	}

	printf("bytes written: %u\n", bytes);

	hexdump((unsigned char *)b, bytes);

	return (0);
}