Error (Function)

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Help / WLanguage / WLanguage functions / Standard functions / Windows functions / Dialog Box functions

Features of the dialog box
Line break in the dialog box
Displaying the last error message
Miscellaneous
Emulation
Application in the background: Specific case from Android 10

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Error (Function)

In french: Erreur

Displays a custom error message in a system error window.

Remarks:

This is a modal warning window. To continue running the application, the user must click "OK".
To avoid blocking the application, use ErrorAsynchronous.
WINDEV allows you to apply the skin template of your project to this dialog box. For more details, see Customizing dialog boxes.
In a web service, Error is used to define the error returned by the web service. If Error is called multiple times, the error messages are concatenated.

Example

NextTitle("Erreur : Client inconnu")
Error("Ce code client n'existe pas. Vous devez d'abord le créer")

Error("Vous devez indiquer votre nom.")

Syntax

Displaying a custom error message Hide the details

Error(<Text> [, <Line 2> [... [, <Line n>]]])

<Text>: Character string

Text to display.

<Line 2>: Optional character string

Text displayed on the second line.

<Line n>: Optional character string

Text displayed on the Nth line.

Displaying the error message of the last WLanguage function used

Error()

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.

Line break in the dialog box

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

Error("Une erreur a été détectée lors de la saisie de l'adresse. " + CR + ...
	"Merci de modifier les données concernant le client.")

is equivalent to:

Error("Une erreur a été détectée lors de la saisie de l'adresse. ", ...
	"Merci de modifier les données concernant le client.")

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

Error(
[
Une erreur a été détectée lors de la saisie de l'adresse. 

Merci de modifier les données concernant le client.
])

Displaying the last error message

Calling Error without any parameters (syntax 2) displays the error message of the last WLanguage function that triggered an error.

In this case, the following code:

Error()

is equivalent to:

Error(ErrorInfo())

Caution: The Error function must be used immediately after calling the failed function.. If a WLanguage function is called, it may reset and change the error report returned by Error.

Miscellaneous

Timers (TimerSys) are not stopped when this function is called.
This function must not be used in a Thread.
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 "Resize" event of the window. Otherwise, the application will be locked.
- in the "Change the orientation" event of the window.
- in the "Move to the foreground" event associated with the project.
  Note: The function can also be used in the "Bring to foreground" event of a window..
- in a thread.

Emulation

An error message can be emulated by EmulateError.

Application in the background: Specific case from Android 10

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

Error 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.

Business / UI classification: UI Code

Component: wd300obj.dll