/// <summary>
/// Returns true if SafeFileHandle subclass value has changed else returns false
/// </summary>
/// <returns></returns>
public static bool IsChanged(ChildSafeFileHandle hnd)
{
Int32 hndInt32 = SHInt32(hnd); //get the 32-bit value associated with hnd
if (hndInt32 == ReturnValue)
{
return(true);
}
return(false);
}
/// <summary>
/// Creates and returns a new ChildSafeFileHandle
/// </summary>
/// <returns></returns>
public static ChildSafeFileHandle NewChildSFH()
{
String lpFileName = "B.txt";
DesiredAccess dwDesiredAccess = DesiredAccess.GENERIC_WRITE;
ShareMode dwShareMode = ShareMode.FILE_SHARE_WRITE;
IntPtr lpSecurityAttributes = IntPtr.Zero;
CreationDisposition dwCreationDisposition = CreationDisposition.CREATE_ALWAYS;
FlagsAndAttributes dwFlagsAndAttributes = FlagsAndAttributes.None;
IntPtr hTemplateFile = IntPtr.Zero;
//create the handle
ChildSafeFileHandle hnd = ChildSafeFileHandle.CreateChildSafeFileHandle(lpFileName, dwDesiredAccess, dwShareMode,
lpSecurityAttributes, dwCreationDisposition,
dwFlagsAndAttributes, hTemplateFile);
return(hnd);
}
/// <summary>
/// Returns the Int32 value associated with a ChildSafeFileHandle
/// </summary>
/// <returns></returns>
public static Int32 SHInt32(ChildSafeFileHandle hnd)
{
IntPtr hndIntPtr = hnd.DangerousGetHandle(); //get the IntPtr associated with hnd
return(hndIntPtr.ToInt32()); //return the 32-bit value associated with hnd
}