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WinHttpWebSocketClose function (winhttp.h)

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The WinHttpWebSocketClose function closes a WebSocket connection.

Syntax

WINHTTPAPI DWORD WinHttpWebSocketClose(
  [in]           HINTERNET hWebSocket,
  [in]           USHORT    usStatus,
  [in, optional] PVOID     pvReason,
  [in]           DWORD     dwReasonLength
);

Parameters

[in] hWebSocket

Type: HINTERNET

Handle to a WebSocket.

Note  WinHttpWebSocketClose does not close this handle. To close the handle, call WinHttpCloseHandle on hWebSocket once it is no longer needed.

 

[in] usStatus

Type: USHORT

A close status code. See WINHTTP_WEB_SOCKET_CLOSE_STATUS for possible values.

[in, optional] pvReason

Type: PVOID

A detailed reason for the close.

[in] dwReasonLength

Type: DWORD

The length of pvReason, in bytes.

If pvReason is NULL, this must be 0. This value must be within the range of 0 to 123.

Return value

Type: DWORD

With the following exception, all error codes indicate that the underlying TCP connection has been aborted.

Description
ERROR_INVALID_OPERATION
 A close or send is pending.
ERROR_INVALID_PARAMETER
 A parameter is invalid.
ERROR_INVALID_SERVER_RESPONSE
 Invalid data was received from the server.

Remarks

WinHttpWebSocketClose completely closes a WebSocket connection. To close the send channel while still leaving the receive channel open, use WinHttpWebSocketShutdown.

It is possible to receive a close frame during regular receive operations. In this case, WinHttpWebSocketClose will also send a close frame.

The close timer can be set by the property WINHTTP_OPTION_WEB_SOCKET_CLOSE_TIMEOUT. The default is 10 seconds.

Requirements

Requirement Value
Minimum supported client Windows 8 [desktop apps only]
Minimum supported server Windows Server 2012 [desktop apps only]
Target Platform Windows
Header winhttp.h
Library Winhttp.lib
DLL Winhttp.dll

See also

WINHTTP_WEB_SOCKET_CLOSE_STATUS

WinHttpCloseHandle

WinHttpWebSocketShutdown