version checking before application launch cocoa

Question

Hi, I am developing an application in cocoa which is not compatible with snow os .Is it possible to show an alert message while user try to launch the application in snow os?

Answer 1

You need to add the key LSMinimumSystemVersion to your app's Info.plist. As per the documentation:

This string must be of the form n.n.n where n is a number. The first number is the major version number of the system. The second and third numbers are minor revision numbers. For example, to support Mac OS X v10.4 and later, you would set the value of this key to "10.4.0".

Answer 2

#ifndef NSAppKitVersionNumber10_5
#define NSAppKitVersionNumber10_5 949
#endif 
if(NSAppKitVersionNumber>NSAppKitVersionNumber10_5)
{
    NSAlert *alert = [NSAlert alertWithMessageText:@"Failed OS check"
    defaultButton:NSLocalizedString(@"OK", @"")
    alternateButton:nil otherButton:nil 
    informativeTextWithFormat:
    @"I am a hard up developer that cannot afford to keep up with my 
    customers. If only they would buy more of my apps i could afford 
    maybe a new mac mini with Snow Leopard on it and bring my 
    App upto date. The problem is that unless i can bring my 
    app upto date i am not likely to get many customers at all.
    If you know how that film with Art Garfunkel ended could
    you please let me know."];
    [alert runModal];
} else {
// start up app
}

*(thanks adium)