ErrorAsynchronous (Function)

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Characteristics of dialog box
Line break in the dialog box
Miscellaneous
Application in the background: Android 10 specific case

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ErrorAsynchronous (Function)

In french: ErreurAsynchrone

Displays a custom error message in a non-blocking system error window.

Remarks:

This is a non-blocking error window. The WLanguage code that follows the call to ErrorAsynchronous continues to run. To close the window, the user must click the OK button to validate. When the user clicks "OK", the code of a WLanguage procedure can be run.
In the WLanguage code following the call to the function, another modal window cannot be opened before closing the dialog box.

Example

NextTitle("Error: Interrupted process")
ErrorAsynchronous("The current process caused an error for the following customer: " + ...
CUSTOMER.CUSTOMERID + "." + CR + "The process must be restarted for this customer.", ...
MyProcedure_Error)

INTERNAL PROCEDURE MyProcedure_Error()
ToastDisplay("The user closed the window.")
END

Syntax

ErrorAsynchronous(<Text> [, <WLanguage procedure>])

<Text>: Character string (with quotes)

Text to display.

<WLanguage procedure>: Name of procedure or lambda procedure, optional

Name of the WLangage procedure ("callback" procedure) called when the user clicks "OK" in the error window.
This WLanguage procedure can correspond to:
a name of a global procedure,
a name of internal procedure,
a lambda procedure.
If this parameter is not specified, no procedure is run when the user clicks "OK" in the error window.

Remarks

Characteristics of dialog box

The title of the dialog box corresponds to the title of the current window (or page).
To comply with the system specifications, the title of dialog box is empty by default. To define this title, use NextTitle.
To modify or define the title of dialog box, use NextTitle.

The message is aligned to left.
The button caption depends on the runtime language of Windows.
The maximum number of characters cannot exceed 4096. If a larger string is passed in parameter, it will be truncated.
The icon displayed (white cross) cannot be modified.

Line break in the dialog box

The CR string (Carriage Return) can be used to force a break to the next line. For example:

ErrorAsynchronous("An error was detected while entering the address." + CR + ...
"Please modify the customer details.")

You also have the ability to use the syntax of multiline strings. For example:

ErrorAsynchronous(
[
An error was detected while entering the address.

Please modify the customer details.
])

Miscellaneous

Timers (TimerSys) are not stopped when this function is called.
The caption of the button is displayed in the language used by Windows on the current computer.
This function must not be used:
- in the event "Resizing" of the window. Otherwise, the application will be locked.
- in the event "Changing the orientation" of the window.
- in the event "Move to the foreground" associated with the project.
  Remark: However, the function can be used in the event "Move to the foreground" of a window.
- in a thread.

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.

ErrorAsynchronous 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.

ErrorAsynchronous 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.

ErrorAsynchronous 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 : wd260obj.dll