ErrorWithTimeoutAsynchronous (Function)

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WLanguage

WLanguage functions

Standard functions

Windows management functions

Dialog Box functions

WLanguage procedure

ErrorWithTimeoutAsynchronous

Presentation

Example

Features of the dialog box

Line break in the dialog box

Miscellaneous

Application in the background: Specific case from Android 10

See also

ErrorWithTimeoutAsynchronous (Function)

In french: ErreurAvecDélaiAsynchrone

Displays a custom error message in a non-blocking system error window for a given amount of time. After the timeout, the system window is automatically closed.

Remarks:

This is a non-blocking error window. The WLanguage code that follows the call to ErrorWithTimeoutAsynchronous continues to run. To close the window, the user must validate the OK button or wait for the end of the timeout. 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.
To use this function, you must integrate a custom dialog box into your project. For more details, see Customizing dialog boxes.
WINDEV allows you to apply the skin template of your project to this dialog box. For more details, see Customizing dialog boxes.

New in version 28

This function is now available for Android applications.

Example

// Display "An error was detected" in an error window
// This error window will be automatically closed after 10 seconds
ErrorWithTimeoutAsynchronous(1000, "An error was detected")

Syntax

ErrorWithTimeout(<Timeout> , <Text> [, <WLanguage procedure>])

<Timeout>: Integer ou Duration

Amount of time (expressed in hundredth of second) before automatically closing the error window. This parameter can be:
an integer corresponding to the number of hundredths of a second,
a Duration variable,
the duration in a readable format (e.g., 1 s or 10 ms).

<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:
a name of a global procedure,
a name of an 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

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.

To use this function, you must customize the dialog boxes in your application. In the project description window, in the "Style" tab, check "Customize system windows (Info, YesNo, Confirm, Dialog)". 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:

ErrorWithTimeoutAsynchronous(500, "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:

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

Please modify the customer details.
])

Miscellaneous

Timers (TimerSys) are not stopped when this function is called.
Windows events 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 "Resizing" event of the window. Otherwise, the application will be locked.
- in the "Changing the orientation" event of the window.
- in the "Move to the foreground" event associated with the project.
  Remark: However, the function can be used in the "Move to the foreground" event 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.

ErrorWithTimeoutAsynchronous 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). 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.

For more details, see Android 10: Behavior of applications in the background.

Component: wd280obj.dll