Question

我用一些非客观的c代码写了这个方法，仪器告诉我有泄漏。不仅如此，而且免费（char *）崩溃......

任何帮助都将不胜感激。

由于

NSArray *keys = @[@"@\"NSMutableArray\""];

        //Init result
        id result = object;

        //Iterate every key
        for (id key in [dict allKeys]) {

            //Convert key to const char
            const char * c =(const char*)malloc(sizeof(uint32_t));
            c = [key cStringUsingEncoding:NSASCIIStringEncoding];

            //Use c to see if the class has this property
            if (class_getProperty([object class], c)) {

                //get the property
                objc_property_t property = class_getProperty([result class], c);

                //Get the property name and type
                const char *name = (const char*)malloc(sizeof(uint32_t));
                const char *type = (const char*)malloc(sizeof(uint32_t));

                name = property_getName(property);
                type =property_copyAttributeValue(property, "T");

                //Cast const char to string
                NSString *pNameString = [NSString stringWithFormat:@"%s",name];
                NSString *typeString = [NSString stringWithFormat:@"%s",type];

                //Add relationships
                if ([keys containsObject:typeString]) {

                    //Get array of objects
                    NSArray *relationship = [dict objectForKey:pNameString];

                    NSMutableArray *allSubObjects = [[NSMutableArray alloc]init];
                    //Parse each individual object
                    for (NSDictionary *relationshipObj in relationship) {

                        //Create class from relationship
                        Class class = NSClassFromString(pNameString);

                        //Create object
                        id sub = [self makeObject:[[class alloc]init] fromDictionary:relationshipObj];

                        [allSubObjects addObject:sub];
                    }

                    [result setValue:allSubObjects forKey:pNameString];
                }else{
                    //If so set the property for the key
                    [result setValue:[dict objectForKey:key] forKey:key];
                }
                free((char*)name);
                free((char*)type);
                free(property);
            }else{
                //NSLog(@"%@ did not respond to : %@", result, key);
            }

            free((void*)c);

        }

        //Return result
        return result;

Answer 1

它崩溃是因为你分配了c，然后用cStringUsingEncoding:返回覆盖了指针，然后尝试释放cStringusingEncoding返回的代码，而你的代码并不拥有。此外，原始指针被泄露。

Frome cStringUsingEncoding的{{3}}：

保证返回的C字符串仅在接收器被释放之前有效，或者直到当前存储器被清空为止，以先发生者为准。您应该复制C字符串或使用getCString：maxLength：encoding：如果它需要存储超出此时间的C字符串。

c代码中的内存泄漏

1 个答案: