Warning (Function)

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Windows management functions

Features of the dialog box

Line break in the dialog box

Displaying the dialog box

Miscellaneous

Emulation

Application in the background: Specific case from Android 10

See also

Warning (Function)

In french: Avertissement

Not available

Displays a custom message in a system warning window.

Remarks:

This is a modal warning window. To continue running the application, the user must validate this window by clicking OK.
To avoid blocking the application, use WarningAsynchronous.
WINDEV allows you to apply the skin template of your project to this dialog box. For more details, see Customizing dialog boxes.
This function displays a modal dialog box.

Example

NextTitle("Caution")
Warning("This operation was not validated" + ...
CR + "Contact the application manager")

Syntax

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

<Text>: Character string

Text to be displayed on the first line.

<Line 2>: Optional character string

Text to be displayed on the second line.

<Line n>: Optional character string

Text to be displayed on the Nth line.

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 (exclamation mark in yellow triangle) 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:

Warning("The XXX form was modified" + CR + ...
"Any new modification must be validated.")

is equivalent to:

Warning("The XXX form was modified", ...
"Any new modification must be validated.")

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

Warning(
[
This operation was not validated.

Contact the application provider
])

Displaying the dialog box

The dialog box is a modal window. The dialog box is displayed in the center of the page, with a DDW effect (Dim Disabled Windows).

Warning uses the "WebDeVYesNo" internal page. To include this page in your project:

Click in the quick access buttons.
The creation window appears: click "Page" then "Page".
In the "Internal Page" tab, select the internal page named "Yes/No".
Validate. The "WebDeVYesNo" page appears in the editor.
Save the page by keeping its default name.

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 how long the message is displayed. The dialog box is automatically closed. For question or confirmation dialog boxes, the default button corresponds to the expected answer.
The caption of the button is displayed in the language used by Windows on the current computer.

Emulation

A warning message can be emulated by EmulateWarning.

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.

Warning 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: wd270obj.dll