CheckUserIdentity (Function)

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Specific Mobile functions

Functions for phone management

CheckUserIdentity

Presentation

Example

Application in the background: Android 10 specific case

See also

Functions for phone management

CheckUserIdentity (Function)

In french: VérifieIdentitéUtilisateur

Allows you to check the real identity of the current user via biometrics check.

If the authentication is available, a message asks the user to authenticate himself. Then, the WLanguage authentication procedure is called.

Caution: This function only verifies the user's identity via the data stored on his mobile phone. It is not possible to capture and save the user's fingerprint.

Remarks:

This function is available from iOS version 8.0. The project must be compiled with Xcode 6 (or later). This function is using:
- the "Touch ID" feature of iPhones 5S and later versions.
- Versions 23 and later
  the "Facial recognition" feature of iPhone X.
  New in version 23
  the "Facial recognition" feature of iPhone X.
  the "Facial recognition" feature of iPhone X.
Versions 23 and later
This feature is available from Android 6.0 (api level 23).
New in version 23
This feature is available from Android 6.0 (api level 23).
This feature is available from Android 6.0 (api level 23).

Versions 23 and later

This function is now available for Android applications.

New in version 23

This function is now available for Android applications.

Example

CheckUserIdentity("Check the identity for unlocking", Authentication)

// Check procedure
PROCEDURE Authentication(nStatus is int, sErrorMessage is string)

SWITCH nStatus
CASE cuiAuthenticated
Info("Authentication OK")
CASE cuiAuthenticationFailure
Error("Authentication failure: " + sErrorMessage)
CASE cuiAuthenticationUnavailable
Error("Authentication not available")
CASE cuiCustomAuthentication
pwd is string
// Comments typed by the user in a multiline control
SWITCH Input("Enter the password: ", pwd)
// OK
CASE 1:
// Cancel
CASE 0:
END
END

Syntax

CheckUserIdentity(<Message> , <Procedure name> [, <Button caption>])

<Message>: Character string (with quotes)

Message that will be displayed to the user.

If this string is a multiline string, only the first line will be visible in the identification popup.
This parameter is ignored during a facial recognition.

<Procedure name>: Character string (with or without quotes)

Name of WLanguage procedure ("callback") called at the end of user authentication. This procedure has the following format:

PROCEDURE <Procedure name> (<Status>, <Error message>)

where:
<Status> is an Integer constant indicating the authentication status:
cuiAuthenticationUnavailable The authentication feature is not available or it was disabled by the user.
cuiCustomAuthentication The user wants to authenticate by using a password: the application will have to manage this authentication manually
cuiAuthenticated The user was properly authenticated.
cuiAuthenticationFailure The authentication failed.
<Error message> is a character string containing the system error message in case of authentication failure (cuiAuthenticationFailure constant). Otherwise, this parameter corresponds to an empty string.

<Button caption>: Optional character string (with quotes)

Default caption of authentication button (displayed on the button for typing the password). This button is used to connect without checking the biometrics. This button is displayed as soon as the first failure occurs.

Remarks

Versions 25 and later

Application in the background: Android 10 specific case

From Android 10, it is no longer possible to open a window when the application is in the background.

CheckUserIdentity can open a window. If this function is used while the application is in the background, a fatal error will occur.

Tips:

It is possible to determine if the application is in the background using InBackgroundMode.
If an application needs to interact with the user while it is in the background, the solution is to display a notification (via the Notification type). When the notification is clicked on, the application will be brought back to the foreground if ..ActivateApplication is set to True. It is also possible to open a window from the procedure passed to ..ActionClick.

See Android 10: Behavior of applications in the background for more details.

New in version 25

Application in the background: Android 10 specific case

From Android 10, it is no longer possible to open a window when the application is in the background.

CheckUserIdentity can open a window. If this function is used while the application is in the background, a fatal error will occur.

Tips:

It is possible to determine if the application is in the background using InBackgroundMode.
If an application needs to interact with the user while it is in the background, the solution is to display a notification (via the Notification type). When the notification is clicked on, the application will be brought back to the foreground if ..ActivateApplication is set to True. It is also possible to open a window from the procedure passed to ..ActionClick.

See Android 10: Behavior of applications in the background for more details.

Application in the background: Android 10 specific case

From Android 10, it is no longer possible to open a window when the application is in the background.

CheckUserIdentity can open a window. If this function is used while the application is in the background, a fatal error will occur.

Tips:

It is possible to determine if the application is in the background using InBackgroundMode.
If an application needs to interact with the user while it is in the background, the solution is to display a notification (via the Notification type). When the notification is clicked on, the application will be brought back to the foreground if ..ActivateApplication is set to True. It is also possible to open a window from the procedure passed to ..ActionClick.

See Android 10: Behavior of applications in the background for more details.

Component : wd250android.jar