iOS 内存泄露BUG列举

1.检查是否可以使用内购

#import <StoreKit/StoreKit.h>

BOOL can = [SKPaymentQueue canMakePayments];
NSLog(@"%d",can);

使用Leak 内存泄露工具检查可以看到有内存泄露

2.获取本机DNS

+ (NSArray *)getDNSs {    
    res_state res = malloc(sizeof(struct __res_state));
    int result = res_ninit(res); 
    
    NSMutableArray *servers = [[NSMutableArray alloc] init];
    if (result == 0) {
        union res_9_sockaddr_union *addr_union = malloc(res->nscount * sizeof(union res_9_sockaddr_union));
        res_getservers(res, addr_union, res->nscount);
        
        for (int i = 0; i < res->nscount; i++) {
            if (addr_union[i].sin.sin_family == AF_INET) {
                char ip[INET_ADDRSTRLEN];
                inet_ntop(AF_INET, &(addr_union[i].sin.sin_addr), ip, INET_ADDRSTRLEN);
                NSString *dnsIP = [NSString stringWithUTF8String:ip];
                [servers addObject:dnsIP];
            } else if (addr_union[i].sin6.sin6_family == AF_INET6) {
                char ip[INET6_ADDRSTRLEN];
                inet_ntop(AF_INET6, &(addr_union[i].sin6.sin6_addr), ip, INET6_ADDRSTRLEN);
                NSString *dnsIP = [NSString stringWithUTF8String:ip];
                [servers addObject:dnsIP];
            }
        }
        free(addr_union);
    }
    
    res_nclose(res);
    free(res);
    
    return [NSArray arrayWithArray:servers];
}

产生内存泄露的代码是：int result = res_ninit(res);