在 Objective C 中将动态 C 数组作为实例变量进行存储和访问

发布于 2025-01-02 09:54:13 字数 580 浏览 1 评论 0原文

我想将动态数组（指向）存储为对象中的实例变量，并且能够将数组初始化为自定义大小。就像这个简单的代码一样：

@interface DummyClass: NSObject {
float * X;
}
@property float * X;
@end

@implementation DummyClass
@synthesize X;
-(id) init {
    [super init];
    X = malloc(100*sizeof(float));
}
@end

int main(int argc, const char * argv) {
    float * mypointer;
    DummyClass * myclass = [[DummyClass alloc] init];
    mypointer = myclass.X;
    mypointer[0] = 1;
    NSLog(@"Vallue assigned succesfully");
    getchar();
    return 0;
}

当尝试为 mypointer[0] 赋值时，会出现“分段错误”错误。在对象中存储和访问动态数组的正确方法是什么？

原文

I would like to store (pointers to) dynamic arrays as the instance variables in objects, and be able to initialize the arrays to custom size. Like in this simple code:

@interface DummyClass: NSObject {
float * X;
}
@property float * X;
@end

@implementation DummyClass
@synthesize X;
-(id) init {
    [super init];
    X = malloc(100*sizeof(float));
}
@end

int main(int argc, const char * argv) {
    float * mypointer;
    DummyClass * myclass = [[DummyClass alloc] init];
    mypointer = myclass.X;
    mypointer[0] = 1;
    NSLog(@"Vallue assigned succesfully");
    getchar();
    return 0;
}

This gives "Segmentation fault" error when trying to assign value to mypointer[0]. What's the proper way of storing and accessing dynamic arrays within objects?

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你没皮卡萌 2025-01-09 09:54:13

您的 init 方法需要返回一些内容：

-(id) init {
    self = [super init];
    X = malloc(100*sizeof(float));
    return self;
}

在进行更改后（并且在更正 main 的签名之后），您的程序在这里运行良好。不过，您应该收到有关该错误的警告或错误。你是如何建造和建造的？测试你的示例程序？

Your init method needs to return something:

-(id) init {
    self = [super init];
    X = malloc(100*sizeof(float));
    return self;
}

Your program runs fine for me here after making that change (and after correcting the signature of main). You should have had a warning or error about that mistake, though. How did you build & test your example program?

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