GetHandleInformation

The GetHandleInformation function obtains information about certain properties of an object handle. The information is obtained as a set of bit flags.

BOOL GetHandleInformation(
  HANDLE hObject,    // handle to an object
  LPDWORD lpdwFlags  // points to variable to receive flags
);
 

Parameters

hObject

Specifies a handle to an object. The GetHandleInformation function obtains information about this object handle.

You can specify a handle to one of the following types of objects: access token, event, file, file mapping, job, mailslot, mutex, pipe, printer, process, registry key, semaphore, serial communication device, socket, thread, or waitable timer.

Windows NT 5.0 and later: This parameter can also be a handle to a console input buffer or a console screen buffer.

lpdwFlags

Pointer to a variable that receives a set of bit flags that specify properties of the object handle. The following flags are defined:

Value	Meaning
HANDLE_FLAG_INHERIT	If this flag is set, a child process created with the bInheritHandles parameter of CreateProcess set to TRUE will inherit the object handle.
HANDLE_FLAG_PROTECT_FROM_CLOSE	If this flag is set, calling the CloseHandle function will not close the object handle.

Return Values

If the function succeeds, the return value is nonzero.

If the function fails, the return value is zero. To get extended error information, call GetLastError.

QuickInfo

  Windows NT: Requires version 3.51 or later.
  Windows: Unsupported.
  Windows CE: Unsupported.
  Header: Declared in winbase.h.
  Import Library: Use kernel32.lib.

See Also

Handles and Objects Overview, Handle and Object Functions, CloseHandle, CreateProcess, SetHandleInformation