Objective-c using C + + classes

Read the Horky classmate's "mixed use objective-c,c++ and objective-c++" blog, I also have some ideas to record, easy to learn in the future

1.objective-c/C + +/C depth blending is not a good choice, prone to error, and poorly maintained, and when using C + + classes in objective-c code, we use equivalent objective-c types and functions to encapsulate C + + code (WRAP).

Do not refer to C + + header files in the 2.objective-c header file because there is no class keyword in objective-c. The compiler will report Unknown type name ' class '; Did you mean ' class '? error.

Here's a column for easy comprehension.

PlayerWindowController.h objective-ct Header File

#import <Cocoa/Cocoa.h>

@interface Playerwindowcontroller:nswindowcontroller

{

@private

void *_player; Define a void *

}

-(BOOL) Playurl: (nsurl *) URL;

@end

PLAYERWINDOWCONTROLLER.MM implementation

#import "PlayerWindowController.h"

#include <libkern/OSAtomic.h>//c++ header file

#include <AudioPlayer.h>//c++ class header files

#include <AudioDecoder.h>//c++ class header files

#define PLAYER (Static_cast<audioplayer *> (_player))

static void decodingstarted (void *context, const audiodecoder *decoder)

{

[(Playerwindowcontroller *) context Decodingstarted:decoder];

}

static void renderingstarted (void *context, const audiodecoder *decoder)

{

[(Playerwindowcontroller *) context Renderingstarted:decoder];

}

static void renderingfinished (void *context, const audiodecoder *decoder)

{

[(Playerwindowcontroller *) context Renderingfinished:decoder];

}

@implementation Playerwindowcontroller

-(ID) init

{

if (nil = = (self = [Super initwithwindownibname:@ "Playerwindow"])) {

[self release];

return nil;

}

_player = new Audioplayer ();

return self;

}

-(BOOL) Playurl: (nsurl *) URL

{

Audiodecoder *decoder = Audiodecoder::createdecoderforurl (reinterpret_cast<cfurlref> (URL));

if (nullptr = = decoder)

return NO;

player->stop ();

Register player Start/end messages to facilitate UI update

Decoder->setdecodingstartedcallback (decodingstarted, self);

Decoder->setrenderingstartedcallback (renderingstarted, self);

Decoder->setrenderingfinishedcallback (renderingfinished, self);  

return YES;

}

Objective-c using C + + classes