WsOpenChannel function (webservices.h)

Article
10/13/2021

Open a channel to an endpoint.

Syntax

HRESULT WsOpenChannel(
  [in]           WS_CHANNEL                *channel,
  [in]           const WS_ENDPOINT_ADDRESS *endpointAddress,
  [in, optional] const WS_ASYNC_CONTEXT    *asyncContext,
  [in, optional] WS_ERROR                  *error
);

Parameters

[in] channel

The channel to open.

[in] endpointAddress

The address of the endpoint.

[in, optional] asyncContext

Information on how to invoke the function asynchronously, or NULL if invoking synchronously.

[in, optional] error

Specifies where additional error information should be stored if the function fails.

Return value

This function can return one of these values.

Return code	Description
WS_S_ASYNC	The asynchronous operation is still pending.
WS_E_OPERATION_ABORTED	The operation was aborted.
WS_E_INVALID_OPERATION	The operation is not allowed due to the current state of the object.
WS_E_ENDPOINT_NOT_FOUND	The remote endpoint does not exist or could not be located.
WS_E_ENDPOINT_ACCESS_DENIED	Access was denied by the remote endpoint.
WS_E_ENDPOINT_DISCONNECTED	The connection with the remote endpoint was terminated.
WS_E_ENDPOINT_FAILURE	The remote endpoint could not process the request.
WS_E_ENDPOINT_NOT_AVAILABLE	The remote endpoint is not currently in service at this location.
WS_E_ENDPOINT_TOO_BUSY	The remote endpoint is unable to process the request due to being overloaded.
WS_E_ENDPOINT_UNREACHABLE	The remote endpoint was not reachable.
WS_E_INVALID_ENDPOINT_URL	The endpoint address URL is invalid.
WS_E_INVALID_FORMAT	The input data was not in the expected format or did not have the expected value.
WS_E_OPERATION_TIMED_OUT	The operation did not complete within the time allotted.
WS_E_PROXY_ACCESS_DENIED	Access was denied by the HTTP proxy server.
WS_E_PROXY_FAILURE	The HTTP proxy server could not process the request.
WS_E_QUOTA_EXCEEDED	A quota was exceeded.
WS_E_SECURITY_VERIFICATION_FAILURE	Security verification was not successful for the received data.
WS_E_SECURITY_SYSTEM_FAILURE	A security operation failed in the Windows Web Services framework.
WS_E_PROXY_REQUIRES_BASIC_AUTH	The HTTP proxy server requires HTTP authentication scheme 'basic'.
WS_E_PROXY_REQUIRES_DIGEST_AUTH	The HTTP proxy server requires HTTP authentication scheme 'digest'.
WS_E_PROXY_REQUIRES_NEGOTIATE_AUTH	The HTTP proxy server requires HTTP authentication scheme 'negotiate'.
WS_E_PROXY_REQUIRES_NTLM_AUTH	The HTTP proxy server requires HTTP authentication scheme 'NTLM'.
WS_E_SERVER_REQUIRES_BASIC_AUTH	The remote endpoint requires HTTP authentication scheme 'basic'.
WS_E_SERVER_REQUIRES_DIGEST_AUTH	The remote endpoint requires HTTP authentication scheme 'digest'.
WS_E_SERVER_REQUIRES_NEGOTIATE_AUTH	The remote endpoint requires HTTP authentication scheme 'negotiate'.
WS_E_SERVER_REQUIRES_NTLM_AUTH	The remote endpoint requires HTTP authentication scheme 'NTLM'.
E_OUTOFMEMORY	Ran out of memory.
E_INVALIDARG	One or more arguments are invalid.
Other Errors	This function may return other errors not listed above.

Remarks

If the open is successful, then the channel must be closed using WsCloseChannel before it can be freed.

Use WsCreateChannel to create the channel.

Once a channel has been opened to an endpoint, then all communication occurs with that endpoint.

The endpoint address and its contents are not required after the function returns, even if the function is invoked asynchronously (for example, it can safely be declared on the stack).

Whether any IO actually happens during this call will depend on the type of channel and its settings.

Requirements

Requirement	Value
Minimum supported client	Windows 7 [desktop apps \| UWP apps]
Minimum supported server	Windows Server 2008 R2 [desktop apps \| UWP apps]
Target Platform	Windows
Header	webservices.h
Library	WebServices.lib
DLL	WebServices.dll

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