From Xojo Documentation
Usage (Web apps)
Usage (iOS apps)
Displays message in a browser dialog with a single OK button.
Usage (Console apps)
Works the same as Print. The message is output to the console/terminal.
Usage (Desktop apps)
|message||String||Any valid string expression.
This parameter contains the main message of the dialog. If you use two EndofLine characters to form a paragraph break, subsequent paragraphs will be de-emphasized on Macintosh, Windows, and Linux. They appear in the same font size on other platforms. See the example in the Examples section for MessageBox.
|You should avoid using MessageBox for displaying debugging messages. The displaying of the Message Box will alter event order and may give unexpected results. Instead use the Debugger, System.DebugLog or your own logging mechanism.|
A message can be presented to the user with either the MessageBox method or the MessageDialog class. The MessageBox method is recommended for simple informational messages only. For other situations, the MessageDialog class is more appropriate. It enables you to add up to three buttons, label them in any way, and take any action after the user clicked a button.
|MsgBox is an alias for MessageBox. While deprecated, it remains for compatibility with Visual Basic, making it easier to port such programs to Xojo.|
The Message box opened by MsgBox has a Title bar. On Windows, the dialog also has a Close widget in its Title bar. The dialog can be closed either by clicking OK or clicking the Close widget. On Windows and Linux, the width increases to accommodate the longest paragraph. On Macintosh, the Message box has a fixed width and the text word-wraps to fit the width of the MsgBox.
Multiple paragraphs can be passed in the message parameter by separating each paragraph with the EndOfLine function.
Closing a MessageBox gives the focus back to the window, which calls its Activated event.
On macOS only the Caution icon is displayed. This is the result of changes made by Apple in HID specs. See here for details.
The MessageBox buttons are not localized — this is a known bug (feedback report 4665).
This code displays a one line Message box.
The following desktop code displays a multiline Message box. The text after the two EndOfLine function calls appears in plain type with a smaller font size. Please note that it is entered as one line in the Code Editor.
+ EndOfLine + EndOfLine + "Any additional voluntary contributions are gratefully accepted.")