如何在iOS中正确释放内存:永远不会释放内存; 潜在的内存泄漏指向

Question

我有下一个代码,用于将NSMutableString对象转换为NSData对象:

-(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分析它时,它说

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

这句话指向我代码的最后一行:

return [NSData dataWithBytes:bytes length:c];

如果我通过执行'free(bytes)'释放对象,那么我的功能无用......任何帮助我都会感激

Answer 1

你需要free字节,因为NSData它不取得它的所有权:它不知道数组是临时的还是动态的,所以它复制了它.

要解决此问题,请替换

return [NSData dataWithBytes:bytes length:c];

同

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