gistfile1.txt

#include<stdio.h>            
#include<windows.h>
#include<stdlib.h>
 
void diskread(HANDLE hDevice, int disk_size,int& bad_sector)
{
	char buf[512];
	int numread;
	int ldistanceHigh = 512;
 
	OVERLAPPED ov;
	LARGE_INTEGER nLarge;
	DWORD dwvalue;
	
	nLarge.QuadPart = 0;
	ov.hEvent = CreateEvent(NULL, FALSE, FALSE, NULL);
	ov.Offset = nLarge.LowPart;
	ov.OffsetHigh = nLarge.HighPart;
 
	
	while (ReadFile(hDevice, buf, 512, NULL, &ov) == 0)
	{
		dwvalue = WaitForSingleObject(ov.hEvent, 200);  //how much time will be the bad sector ??
		if (dwvalue == WAIT_TIMEOUT) //if time out
		{
			bad_sector++;
		}
 
		dwvalue = GetLastError();
		if (dwvalue == ERROR_IO_PENDING)
		{
			/*for (int i = 0; i < 12; i++)
			{
				printf("%c", buf[i]);
			} */         
			//for checking this goes allright
		}
		
		//--------------------for showing------------------------------------------
		system("cls");
		printf("disk size : %d MB\n", disk_size);
		printf("\t%.4f%% \nbad_sector : %d", (double)nLarge.QuadPart/20/disk_size, bad_sector);		
		//-------------------------------------------------------------------------
		nLarge.QuadPart += 512;
		ov.Offset = nLarge.LowPart;
		ov.OffsetHigh = nLarge.HighPart;
	}
}
 
 
 
typedef BOOL(WINAPI *P_GDFSE)(LPCTSTR, PULARGE_INTEGER, PULARGE_INTEGER, PULARGE_INTEGER);
 
int get_disk_size(void) {
	BOOL fResult;
	char *pszDrive = "C:"; //compute c drive 
	P_GDFSE pGetDiskFreeSpaceEx = NULL;
	unsigned __int64 i64FreeBytesToCaller,
		i64TotalBytes,
		i64FreeBytes;
	pGetDiskFreeSpaceEx = (P_GDFSE)GetProcAddress(
		GetModuleHandle("kernel32.dll"), "GetDiskFreeSpaceExA"
		);
	fResult = pGetDiskFreeSpaceEx(pszDrive,
		(PULARGE_INTEGER)&i64FreeBytesToCaller,
		(PULARGE_INTEGER)&i64TotalBytes,
		(PULARGE_INTEGER)&i64FreeBytes);
	if (!fResult)
	{
		printf("ERROR: Could not get free space for %s\n", pszDrive);
		exit(GetLastError());
	}
	return i64TotalBytes / (1024 * 1024); //return total MB
}
 
 
 
int main(void)
{
	char cur_drv[100];
	char buf[512];
	int ldistanceHigh = 0;
	int disk_size = get_disk_size(); //size of c drive
 
	sprintf_s(cur_drv, "\\\\.\\PhysicalDrive%d", 0); //which physicaldrive
	HANDLE hDevice = CreateFile((LPCSTR)cur_drv, GENERIC_READ, FILE_SHARE_READ | FILE_SHARE_WRITE, NULL, OPEN_EXISTING,FILE_FLAG_OVERLAPPED|FILE_FLAG_NO_BUFFERING, 0);
	if (hDevice == INVALID_HANDLE_VALUE){
		printf("INVLIAD read"); return 0;
	}
	//SetFilePointer(hDevice, 0, (long *)&ldistanceHigh, FILE_BEGIN); //pointer set   it can be useful
	
	int bad_sector = 0;
	diskread(hDevice, disk_size,bad_sector);
 
	CloseHandle(hDevice);
 
	return bad_sector;
}