ios 将 NSString 转换为字符数组

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时间:2020-08-30 23:28:54  来源:igfitidea点击:

Convert NSString to char array

iosobjective-carrayschar

提问by NNikN

const char arr[]="Hello There";

I am trying to create a character array as above.

我正在尝试创建一个如上所述的字符数组。

Below, is the code which I use. Is this a correct way to create a char array.

下面是我使用的代码。这是创建字符数组的正确方法吗?

-(void) createCharArray:(NSString*) text{
   char arr[text.length];
   for(int i=0;i<text.length;i++){
    arr[i]=[text characterAtIndex:i];
   }
}

Do we have to worry about null termination? Do we have any other way to achieve the same?

我们是否需要担心空终止?我们还有其他方法可以实现相同的目标吗?

回答by Pranav

You can use UTF8String. Eg: [myString UTF8String].

您可以使用UTF8String. 例如:[myString UTF8String]

回答by Duncan C

No, that is not the correct way on several levels. NSString supports unicode, which far exceeds the number of possible characters that will fit in a byte array.

不,这在几个层面上都不是正确的方法。NSString 支持 unicode,这远远超过了适合字节数组的可能字符数。

You need to use an encoding like UTF8 if yo want to convert unicode to 8 bit characters.

如果您想将 unicode 转换为 8 位字符,您需要使用像 UTF8 这样的编码。

Take a look at the method getCString:maxLength:encoding:, and try using NSUTF8StringEncoding.

查看方法 getCString:maxLength:encoding:,并尝试使用 NSUTF8StringEncoding。

That method should do what you want to do with a single call.

该方法应该可以通过一次调用完成您想要做的事情。

回答by Akhilrajtr

Use,

用,

NSString *str = @"Hello There";
const char *c = [str cStringUsingEncoding:NSUTF8StringEncoding];