Windows non-recoverable delete files

//////////////////////////////////////////////////////////////////////////
Function: Erasefile
Parameters: strFilePath (full path to file)
Features: Non-recoverable deletion of individual files
Time:
//////////////////////////////////////////////////////////////////////////
BOOL erasefile (LPWStr strFilePath)
{

HANDLE hfile = Invalid_handle_value;
BOOL bok = FALSE;
Char zerobuf[512];
int index = 0;

ZeroMemory (zerobuf, sizeof (ZEROBUF));
Do
{

setfileattributes (strFilePath, file_attribute_normal);

hfile = CreateFile (strFilePath,

Generic_read | Generic_write,

0,

NULL,

open_existing,

File_attribute_normal,

NULL);

if (hfile = = Invalid_handle_value)

{

Break

;

}

DWORD nsize = GetFileSize (hfile, NULL);

int nwritecount = nsize/sizeof (zerobuf);

nwritecount = max (Nwritecount, 1);

DWORD dwbytes = 0;

for

(int i = 0; i < Nwritecount; i++)

{

WriteFile (hfile, Zerobuf, sizeof (ZEROBUF), &dwbytes, NULL);

}

index++;

CloseHandle (hfile);

} while (index < 1);

bOK = deletefile (strFilePath);
return bok;

}

Windows non-recoverable delete files