Error (Function)

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Functions for Windows management

Characteristics of dialog box

Line break in the dialog box

Displaying the last error message

Miscellaneous

Emulation

Application in the background: Android 10 specific case

See also

Error (Function)

In french: Erreur

Displays a custom error message in a system error window.

Remarks:

This is a blocking warning window. To continue running the application, the user must click "OK".
Versions 25 and later
To avoid blocking the application, use ErrorAsynchronous.
New in version 25
To avoid blocking the application, use ErrorAsynchronous.
To avoid blocking the application, use ErrorAsynchronous.
WINDEV allows you to apply the skin template of your project to this dialog box. See Customizing dialog boxes for more details.
Versions 16 and later
In a Webservice, Error is used to define the error returned by the Webservice. If several call to Error are performed, the error messages are concatenated.
New in version 16
In a Webservice, Error is used to define the error returned by the Webservice. If several call to Error are performed, the error messages are concatenated.
In a Webservice, Error is used to define the error returned by the Webservice. If several call to Error are performed, the error messages are concatenated.

Versions 15 and later

This function is now available for Android applications.

New in version 15

This function is now available for Android applications.

Versions 16 and later

This function is now available for Windows Phone applications.

New in version 16

This function is now available for Windows Phone applications.

Versions 17 and later

This function is now available for iPhone/iPad applications.

New in version 17

This function is now available for iPhone/iPad applications.

Versions 18 and later

This function is now available in Windows Store apps mode.

New in version 18

This function is now available in Windows Store apps mode.

Versions 21 and later

This function is now available in Universal Windows 10 App mode.

New in version 21

This function is now available in Universal Windows 10 App mode.

Versions 22 and later

The syntax 2 is now available.

New in version 22

The syntax 2 is now available.

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 (with quotes)

Text to display.

<Line 2>: Optional character strings (with quotes)

Text displayed on the following lines.

<Line n>: Optional character strings (with quotes)

Text displayed on the following lines.

Displaying the error message of the last WLanguage function used

Error()

Displaying the error message of the last WLanguage function used

Error()

Remarks

Characteristics of 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 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 in parameter, it will be truncated.
The icon displayed (white cross) cannot be modified.

To customize this dialog box (as well as all system dialog boxes of your application), check "Customize the system windows (Info, YesNo, Confirm, Dialog)" in the "Style" tab of the project description. See Customizing dialog boxes for more details.

Versions 16 and later

To customize this dialog box (as well as all system dialog boxes of your site), check "Apply the skin to the dialog boxes (YesNo and OKCancel)" in the "Skin" tab of the project description window.

New in version 16

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

Error used with no parameter (syntax 2) displays the error message corresponding to 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. Indeed, the call to a WLanguage function can reinitialize and modify 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 is used to limit the display duration of all the dialog boxes. The dialog box is automatically closed. For question or confirmation dialog boxes, the default button corresponds to the expected answer.
Versions 18 and later
To limit the display duration of an Error dialog box only, use ErrorWithTimeout.
New in version 18
To limit the display duration of an Error dialog box only, use ErrorWithTimeout.
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.

Versions 25 and later

Application in the background: Android 10 specific case

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). When the notification is clicked on, the application will be brought back to the foreground if ..ActivateApplication is set to True. It is also possible to open a window from the procedure passed to ..ActionClick.

See Android 10: Behavior of applications in the background for more details.

New in version 25

Application in the background: Android 10 specific case

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). When the notification is clicked on, the application will be brought back to the foreground if ..ActivateApplication is set to True. It is also possible to open a window from the procedure passed to ..ActionClick.

See Android 10: Behavior of applications in the background for more details.

Application in the background: Android 10 specific case

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). When the notification is clicked on, the application will be brought back to the foreground if ..ActivateApplication is set to True. It is also possible to open a window from the procedure passed to ..ActionClick.

See Android 10: Behavior of applications in the background for more details.

Business / UI classification : UI Code

Component : wd260obj.dll