Show Dialog Message Box in Objective-C Cocoa

There are a few ways to achieve this in Objective-C/Cocoa, and I found NSAlert to be the simplest base class for this purpose.

See example below of a small Utility class with this functionality.

Util.h

#import <Cocoa/Cocoa.h>

@interface Util: NSObject {
}

+(void)MessageBox:(char*) header:(char*) message: (unsigned long) message_type;

+(void)MessageBox:(NSString *) header:(NSString *) message;

@end

Util.m


#import "Util.h"

@implementation Util

+(void)MessageBox:(NSString *) header:(NSString *) message
{
CFOptionFlags result;

CFUserNotificationDisplayAlert(
0, //timeout
kCFUserNotificationNoteAlertLevel, //icon
NULL, //icon url
NULL,
NULL,
header,
message,
NULL, //button options default to just "ok"
CFSTR("Cancel"),
NULL,
&result //response
);

if (result==kCFUserNotificationDefaultResponse)
return NSAlertDefaultReturn;
else
return NSAlertErrorReturn;
}

+(void)MessageBox:(char*) header:(char*) message: (unsigned long) message_type
{
CFStringRef header_ref = CFStringCreateWithCString(NULL,header,strlen(header));
CFStringRef message_ref = CFStringCreateWithCString(NULL,message,strlen(message));

CFOptionFlags result;

CFUserNotificationDisplayAlert(
0,
kCFUserNotificationNoteAlertLevel,
NULL,
NULL,
NULL,
header_ref,
message_ref,
NULL,
CFSTR("Cancel"),
NULL,
&result
);

CFRelease(header_ref);
CFRelease(message_ref);

if (result==kCFUserNotificationDefaultResponse)
return NSAlertDefaultReturn;
else
return NSAlertErrorReturn;
}
@end

References
iphonedevsdk.com, http://www.iphonedevsdk.com/forum/iphone-sdk-development/8478-simple-message-box-popup.html
blogspot.com, Jorge Arimany, http://jorgearimany.blogspot.com/2010/05/messagebox-from-windows-to-mac.html
Google Codesearch (“kCFUserNotification”),

About Ronnie Diaz

Ronnie Diaz is a software engineer and tech consultant. Ronnie started his career in front-end and back-end development for companies in ecommerce, service industries and remote education. This work transitioned from traditional desktop client-server applications through early cloud development. Software included human resource management and service technician workflows, online retail e-commerce and electronic ordering and fulfillment, IVR customer relational systems, and video streaming remote learning SCORM web applications. Hands on server experience and software performance optimization led to creation of a startup business focused on collocated data center services and continued experience with video streaming hardware and software. This led to a career in Amazon Prime Video where Ronnie is currently employed, building software and systems which stream live sports and events for millions of viewers around the world.

Posted on June 13, 2011, in Programming & Development and tagged , , , , , , , , , , , , . Bookmark the permalink. 2 Comments.

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