Question

我是iOS开发的新手。我想加密和解密。我的问题如下：当我运行我的代码时，解密在模拟器中工作正常但它没有在iPhone设备上运行。我收到以下错误消息：

[__NSArrayM insertObject:atIndex:]: object cannot be nil

这是我的代码。我已经定义了一个包含多个字符串的数组：

<dictionary>
<array>
      <string>india,chennai,salem,coimbatore,krishnagiri,hosur,palghat</string>
      <string>india1,chennai1,salem1,coimbatore1,krishnagiri1,hosur1,palghat1</string>
</array>
</dictionary>

NSString *stringIndex1 = [[NSString alloc]init];
NSMutableArray *arrAthigaaramList1;
dictDecryptList=[[NSMutableDictionary alloc]init];

for(int i=0;i<[arrD_Chapter count];i++)//50 Chapter wise
        {
            stringIndex1 = [arrD_Chapter objectAtIndex:i];
            NSData  *b64DecData = [Base64 decode:stringIndex1];
            NSData *decryptedData = [[NSData alloc]init];
            decryptedData= [b64DecData AESDecryptWithPassphrase:@"mypassword"];
            NSString *decryptedStr = [[NSString alloc] initWithData:decryptedData encoding:NSUTF32StringEncoding];

            NSLog(@"Decryped Data Base 64 encoded = %@",decryptedStr);

            [arrAthigaaramList1 addObject:decryptedStr];    
        }

此代码有什么问题？

Answer 1

您应该执行以下操作：

NSString *stringIndex1 = [[NSString alloc]init];
NSMutableArray *arrAthigaaramList1 = [[NSMutableArray alloc] init];
dictDecryptList=[[NSMutableDictionary alloc]init];

for(int i=0;i<[arrD_Chapter count];i++)//50 Chapter wise
    {
        stringIndex1 = [arrD_Chapter objectAtIndex:i];
        NSData  *b64DecData = [Base64 decode:stringIndex1];
        NSData *decryptedData = [[NSData alloc]init];
        decryptedData= [b64DecData AESDecryptWithPassphrase:@"mypassword"];
        NSString *decryptedStr = [[NSString alloc] initWithData:decryptedData encoding:NSUTF32StringEncoding];

        if (decryptedStr) {
            NSLog(@"Decryped Data Base 64 encoded = %@",decryptedStr);
            [arrAthigaaramList1 addObject:decryptedStr];
        } else {
            NSLog(@"ERROR decrypting!!!");
        }


    }

这可以让你做两件事：

1）初始化可变数组。 2）解密并记录错误后，不要尝试插入nil字符串。

Answer 2

初看，我会说你的NSMutableArray *arrAthigaaramList1;没有初始化:)所以你不能添加项目！

将其更改为：

NSMutableArray * arrAthigaaramList1 = [[NSMutableArray alloc] init];

__NSArrayM insertObject：atIndex：];对象不能为零

2 个答案: