问题
Using the hex editor HxDen one can read (and edit) the bytes on the hard drive or a USB key or the RAM. That is, one can read/change the first byte on the hard disk.
I understand how to read the bytes from a file using C++, but I was wondering how one might do this for the hard disk.
To make it simple, given a positive integer n, how can I read byte number n on the hard drive using C++? (I would like to do C++, but if there is an easier way, I would like to hear about that.)
I am using MinGW on Windows 7 if that matters.
回答1:
It is documented in the MSDN Library article for CreateFile, section "Physical Disks and Volumes". This code worked well to directly read the C: drive:
HANDLE hdisk = CreateFile(L"\\\\.\\C:",
GENERIC_READ,
FILE_SHARE_READ | FILE_SHARE_WRITE,
nullptr,
OPEN_EXISTING,
0, NULL);
if (hdisk == INVALID_HANDLE_VALUE) {
int err = GetLastError();
// report error...
return -err;
}
LARGE_INTEGER position = { 0 };
BOOL ok = SetFilePointerEx(hdisk, position, nullptr, FILE_BEGIN);
assert(ok);
BYTE buf[65536];
DWORD read;
ok = ReadFile(hdisk, buf, 65536, &read, nullptr);
assert(ok);
// etc..
Admin privileges are required, you must run your program elevated on Win7 or you'll get error 5 (Access denied).
来源:https://stackoverflow.com/questions/20725397/read-bytes-of-hard-drive