- Features of the dialog box
- Line break in the dialog box
- Application in the background: Specific case from Android 10
In french: ErreurAsynchrone
Displays a custom error message in a non-blocking system error window.
- 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.
- WINDEV allows you to apply the skin template of your project to this dialog box. For more details, see Customizing dialog boxes.
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.", ...
INTERNAL PROCEDURE MyProcedure_Error()
ToastDisplay("The user closed the window.")
ErrorAsynchronous(<Text> [, <WLanguage procedure>])
<Text>: Character string
Text to display.
<WLanguage procedure>: Optional name of procedure or lambda procedure
Name of the WLangage procedure ("callback") called when the user clicks "OK" in the error window.
This WLanguage procedure can correspond to:
If this parameter is not specified, no procedure is run when the user clicks "OK" in the error window.
- a name of a global procedure,
- a name of an internal procedure,
- a lambda procedure.
Features of the 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 the 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 as parameter, it will be truncated.
- The icon displayed (white cross) cannot be modified.
To customize this dialog box
(and all the system dialog boxes in your application), check "Customize system windows (Info, YesNo, Confirm, Dialog)" in the "Style" tab of the project description. For more details, see Customizing dialog boxes
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:
An error was detected while entering the address.
Please modify the customer details.
- Timers (TimerSys) are not stopped when this function is called.
- Windows events are not stopped when this function is called.
- DelayBeforeClosing limits the display time of all dialog boxes. The dialog box is automatically closed. For question or confirmation dialog boxes, the default button corresponds to the expected answer.
To limit the display duration of an Error dialog box only, use ErrorWithTimeout.
- 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.
Application in the background: Specific case from Android 10
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.
- 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). The application will be brought back to the foreground when the notification is clicked, if the ActivateApplication property is set to True. You can also open a window from the procedure passed to the ActionClick property.
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