NSMutableArray addobject with malloc'd struct [英] NSMutableArray addobject with malloc'd struct
本文介绍了NSMutableArray addobject with malloc'd struct的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
我遇到了一段代码的问题。我试图使用addObject方法添加一个CLLocationCoordinate2D的实例到NSMutable数组,但每当该行执行,我的应用程序崩溃。这个代码有什么明显的错误吗?
崩溃是在这一行:
code> [points addObject:(id)new_coordinate];
Polygon.m:
#importPolygon.h
@implementation多边形
@synthesize points;
- (id)init {
self = [super init];
if(self){
points = [[NSMutableArray alloc] init];
}
return self;
}
- (void)addPointLatitude:(double)latitude经度:(double)longitude {
NSLog(@添加坐标:[%f, f]%d,latitude,longitude,[points count]);
CLLocationCoordinate2D * new_coordinate = malloc(sizeof(CLLocationCoordinate2D));
new_coordinate-> latitude = latitude;
new_coordinate-> longitude = longitude;
[points addObject:(id)new_coordinate];
NSLog(@%d,[points count]);
}
- (bool)pointInPolygon:(CLLocationCoordinate2D *)p {
return true;
}
- (CLLocationCoordinate2D *)getNEBounds {
...
}
- (CLLocationCoordinate2D *)getSWBounds {
...
}
- (void)dealloc {
for(int count = 0; count< [points count] count ++){
free([points objectAtIndex:count]);
}
[points release];
[super dealloc]
}
@end
解决方案>
正确的方法是将数据封装在 NSValue
中,这是专门用于将
I'm having trouble with a snippet of code. I'm trying to add an instance of CLLocationCoordinate2D to a NSMutable array using the addObject method, but whenever the line is executed, my app crashes. Is there anything obvious wrong with this code?
The crash is on this line:
[points addObject:(id)new_coordinate];
Polygon.m:
#import "Polygon.h"
@implementation Polygon
@synthesize points;
- (id)init {
self = [super init];
if(self) {
points = [[NSMutableArray alloc] init];
}
return self;
}
-(void)addPointLatitude:(double)latitude Longitude:(double)longitude {
NSLog(@"Adding Coordinate: [%f, %f] %d", latitude, longitude, [points count]);
CLLocationCoordinate2D* new_coordinate = malloc(sizeof(CLLocationCoordinate2D));
new_coordinate->latitude = latitude;
new_coordinate->longitude = longitude;
[points addObject:(id)new_coordinate];
NSLog(@"%d", [points count]);
}
-(bool)pointInPolygon:(CLLocationCoordinate2D*) p {
return true;
}
-(CLLocationCoordinate2D*) getNEBounds {
...
}
-(CLLocationCoordinate2D*) getSWBounds {
...
}
-(void) dealloc {
for(int count = 0; count < [points count]; count++) {
free([points objectAtIndex:count]);
}
[points release];
[super dealloc];
}
@end
解决方案
The proper way to do this is to encapsulate the data inside a NSValue
, which is specifically for putting C types in NSArray
s and other collections.
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