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OpenEvent function

Opens an existing named event object.

Syntax


HANDLE WINAPI OpenEvent(
  _In_  DWORD dwDesiredAccess,
  _In_  BOOL bInheritHandle,
  _In_  LPCTSTR lpName
);

Parameters

dwDesiredAccess [in]

The access to the event object. The function fails if the security descriptor of the specified object does not permit the requested access for the calling process. For a list of access rights, see Synchronization Object Security and Access Rights.

bInheritHandle [in]

If this value is TRUE, processes created by this process will inherit the handle. Otherwise, the processes do not inherit this handle.

lpName [in]

The name of the event to be opened. Name comparisons are case sensitive.

This function can open objects in a private namespace. For more information, see Object Namespaces.

Terminal Services:  The name can have a "Global\" or "Local\" prefix to explicitly open an object in the global or session namespace. The remainder of the name can contain any character except the backslash character (\). For more information, see Kernel Object Namespaces.

Note  Fast user switching is implemented using Terminal Services sessions. The first user to log on uses session 0, the next user to log on uses session 1, and so on. Kernel object names must follow the guidelines outlined for Terminal Services so that applications can support multiple users.

Return value

If the function succeeds, the return value is a handle to the event object.

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

Remarks

The OpenEvent function enables multiple processes to open handles of the same event object. The function succeeds only if some process has already created the event by using the CreateEvent function. The calling process can use the returned handle in any function that requires a handle to an event object, subject to the limitations of the access specified in the dwDesiredAccess parameter.

The handle can be duplicated by using the DuplicateHandle function. Use the CloseHandle function to close the handle. The system closes the handle automatically when the process terminates. The event object is destroyed when its last handle has been closed.

Windows Phone 8: This API is supported.

Windows Phone 8.1: This API is supported.

Requirements

Minimum supported client

Windows XP [desktop apps | Windows Store apps]

Minimum supported server

Windows Server 2003 [desktop apps | Windows Store apps]

Header

WinBase.h on Windows XP, Windows Server 2003, Windows Vista, Windows 7, Windows Server 2008, and Windows Server 2008 R2 (include Windows.h);
Synchapi.h on Windows 8 and Windows Server 2012

Library

Kernel32.lib

DLL

Kernel32.dll

Unicode and ANSI names

OpenEventW (Unicode) and OpenEventA (ANSI)

See also

CloseHandle
CreateEvent
CreateProcess
DuplicateHandle
Event Objects
Object Names
PulseEvent
ResetEvent
SetEvent
Synchronization Functions

 

 

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