如何在iOS中正确释放内存:永远不会释放内存；指出的潜在的内存泄漏 [英] How to release correctly memory in iOS: Memory is never released; potential leak of memory pointed to by

问题描述

我开发了下一个代码，用于将NSMutableString对象转换为NSData对象:

I have the next code developed for converting an NSMutableString object into NSData object:

-(NSData *)desSerializarFirma:(NSMutableString *)firma{

    NSArray *arregloBits    = [firma componentsSeparatedByString:@","];
    unsigned c              = arregloBits.count;
    uint8_t *bytes          = malloc(sizeof(*bytes) * c);

    unsigned i;
    for (i = 0; i < c; i ++)
    {
        NSString *str = [arregloBits objectAtIndex:i];
        int byte = [str intValue];
        bytes[i] = (uint8_t)byte;
    }

    return [NSData dataWithBytes:bytes length:c];
}

当我用xCode分析时说

when I analyze this with xCode it says

memory is never released; potential leak of memory pointed to by 'bytes'

此语句指向我的代码的最后一行:

this statement points to the last line of my code:

return [NSData dataWithBytes:bytes length:c];

如果我通过执行'free(bytes)'释放对象，那么我的函数将变得无用……任何帮助，我将不胜感激

if I release the object by executing 'free(bytes)' then I get my function useless... any help I'll appreciate

推荐答案

您需要free个字节，因为NSData不拥有它的所有权:它不知道该数组是临时数组还是动态数组，因此它会复制它.

You need to free the bytes, because NSData does not take ownership of it: it cannot know if the array is a temporary or a dynamic, so it makes a copy of it.

要解决此问题，请替换

return [NSData dataWithBytes:bytes length:c];

使用

NSData *res = [NSData dataWithBytes:bytes length:c];
free(bytes);
return res;

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