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c++windowswinapiwifiwlanapi

WlanConnect Connection attempt fail

I am trying to connect to an unsecured network using the WlanConnect function. It is returning ERROR_SUCCESS, so far so good.

In my notification callback i receive WLAN_NOTIFICATION_ACM_CONNECTION_COMPLETE followed instantly by WLAN_NOTIFICATION_ACM_CONNECTION_ATTEMPT_FAIL.

Can someone give me a hint how i can find out what causes the connection to fail?

Solution

  • I'm assuming that you just forgot to mention the part where you called WlanRegisterNotification, since you say that your notification callback is actually receiving notifications.

    As it turns out, you're in luck—the API provides you with just such a hint. In the documentation for the structure passed to you in the callback function, WLAN_NOTIFICATION_DATA, it describes what the WLAN_NOTIFICATION_ACM_CONNECTION_ATTEMPT_FAIL notification code means:

    A connection attempt has failed.

    A connection consists of one or more connection attempts. An application may receive zero or more wlan_notification_acm_connection_attempt_fail notifications between receiving the wlan_notification_acm_connection_start notification and the wlan_notification_acm_connection_complete notification.

    The pData member points to a WLAN_CONNECTION_NOTIFICATION_DATA structure that identifies the network information for the connection attempt that failed.

    And that structure has a wlanReasonCode member that contains a WLAN_REASON_CODE value that "indicates the reason for an operation failure." There are a bunch of error codes on that list. Check to see which one you are getting.

    Also note that it is possible to receive a few WLAN_NOTIFICATION_ACM_CONNECTION_ATTEMPT_FAIL notifications before the connection ultimately connects successfully.