Showing a Cocoa UI Alert Panel in pure C

You can display an AlertPanel even if you have a strictly command line app. In the example below it shows a NSPanel called from pure C.


    id app = NULL;

    id pool = (id)objc_getClass("NSAutoreleasePool");
    if (!pool)
    {
        return -1;
    }
    pool = objc_msgSend(pool, sel_registerName("alloc"));
    if (!pool)
    {
        return -1;
    }
    pool = objc_msgSend(pool, sel_registerName("init"));

    app = objc_msgSend((id)objc_getClass("NSApplication"),
                       sel_registerName("sharedApplication"));

    NSRunAlertPanel(CFSTR("Test"),
                    CFSTR("Your App is running!"),
                    CFSTR("Ok"), NULL, NULL);
    
    objc_msgSend(pool, sel_registerName("release"));