windows 不可恢复式的删除文件

//////////////////////////////////////////////////////////////////////////
//函数：EraseFile
//参数：strFilePath(文件的全路径)
//功能：不可恢复删除单个文件
//时间：
//////////////////////////////////////////////////////////////////////////
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;

}