Member Avatar for krishnampkkm

hiii

In my program I'm reading the clusters in the volume using the appropriate physical offsets to the disk.

for(  i=0; i<  total_number_ of_ clusters;i++)
{
  
// convert logical offset to physical offset 

 phys_offset= conversion(i);  // this value I get correctly


 if(!SetFilePointer(drive_handle, 
                             phys_offset,
                             NULL,
                             0))
{
 printf("\nSetFilePointer Failed: Error Number : %d\n",GetLastError());
 return o;
 }


 if(!ReadFile(drive_handle,
                    bBuffer1,
                    cluster_size,
                    &dwRetBytes1,
                    0))
{
printf("\nUnable to Read the Drive Error: %d\n",GetLastError());   
return o;
}
   

} // next cluster

The above code not giving no error messages, but how do we know the program reading correctly?.It returns the correct no of bytes read after one read operation .When I wrote theses data into destination , nothing wrote. What may be the problem??
Where is the mistake in the code ?

Any idea?
-----------
Thanking you
Krish

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VernonDozier commented: Cross posting. -3

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Member Avatar for wildgoose

Would have been nice if you had posted the file open function with the properties you used!

Member Avatar for krishnampkkm 
hmyhandle= CreateFile( _T("\\\\.\\PhysicalDrive0"),
                  GENERIC_READ|GENERIC_WRITE,
                  FILE_SHARE_READ | FILE_SHARE_WRITE,
                  NULL,
                  OPEN_EXISTING,
                  FILE_ATTRIBUTE_NORMAL| 
                  FILE_FLAG_NO_BUFFERING,
                  NULL);
if (hmyhandle==INVALID_HANDLE_VALUE)
{
    printf("\nUnable to Open the source_drive Err_NO:%d\n",GetLastError()); 
    return 0;
}
Edited by Reverend Jim because: Fixed formatting
Member Avatar for wildgoose

May be a security issue? Your open function appears to be correct for read/write!

Member Avatar for krishnampkkm

May be a security issue? Your open function appears to be correct for read/write!

But I've opened as administrator....

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