Created
October 15, 2020 16:32
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| // 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); | |
| } |
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