How to display a modal message box in C++ on Mac?

CFUserNotificationDisplayAlert and CFUserNotificationDisplayNotice creates a non-modal window and this is bad because it could bring your application UI in a very undesired state if you select the original application window (the message box is hidden but the app开发者_如何学运维licaton does not respond).

The old SystemAlert was modal but this one doesn't fully support Unicode strings.

How can i display a message box as a modal window under Mac? I'm looking for someting similar to MessageBox from Windows?

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I've implemented it with CFUserNotificationDisplayAlert and it doesn't return until the user closes the MessageBox.

If you want to take a look of the code, I have it in MessageBox function in Mac there you will find a MessageBox function implemented for mac, it's only implemented for MB_OKCANCEL, but with little more code could cover the entire MessageBox flags and return values, is a good starting point.

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It looks that CreateStandardAlert is the right solution because this one is modal.

DialogRef theItem;
DialogItemIndex itemIndex;
CreateStandardAlert(kAlertNoteAlert, CFSTR("aaa"), CFSTR("bbb"), NULL, &theItem);
RunStandardAlert(theItem, NULL, &itemIndex);

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Have a look at NSBeginAlertSheet function or at NSApp's:

- (void)beginSheet:(NSWindow *)sheet modalForWindow:(NSWindow *)docWindow
      modalDelegate:(id)modalDelegate didEndSelector:(SEL)didEndSelector contextInfo:(void *)contextInfo

may be its what you want. Here is also a nice article about working with sheets.