Error (Function)

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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 Webservice, Error is used to define the error returned by the Webservice. If Error is called multiple times, the error messages are concatenated.

Example

NextTitle("Error: Unknown customer")
Error("This customer code does not exist. It must be created beforehand")

Error("Enter your name.")

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

is equivalent to:

Error("An error was detected while entering the address. ", ...
"Please modify the customer details.")

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

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

Please modify the customer details.
])

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: Error must be used immediately after the call to the function that failed. 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.
Windows events are not stopped when this function is called.
You can use the code wizard to enter the function in the code editor. Depending on the characteristics entered in the wizard, the function used can be different in the code that is automatically generated.
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.

Emulation

An error message can be emulated by EmulateError.

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.

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: wd280obj.dll