如何将NSString转换为std :: string? [英] How do I convert a NSString into a std::string?

问题描述

我有一个NSString对象，想将其转换为std::string.

如何在Objective-C ++中做到这一点?

解决方案

NSString *foo = @"Foo";
std::string bar = std::string([foo UTF8String]);

几年后，让我扩展这个答案.正确地指出，如果最终要使用std::string，则很可能希望将cStringUsingEncoding:与NSASCIIStringEncoding一起使用.您可以将UTF-8与普通的std::strings一起使用，但请记住，这些操作针对字节而不是字符甚至字形.为了获得良好的入门"，请查看此问题及其答案. >

还请注意，如果您有一个无法用ASCII表示的字符串，但仍希望在std::string中使用它，并且您不希望在其中使用非ASCII字符，则可以使用dataUsingEncoding:allowLossyConversion:来获取包含有损ASCII内容的字符串的NSData表示形式，然后将其扔到您的std::string

I have an NSString object and want to convert it into a std::string.

How do I do this in Objective-C++?

解决方案

NSString *foo = @"Foo";
std::string bar = std::string([foo UTF8String]);

Edit: After a few years, let me expand on this answer. As rightfully pointed out, you'll most likely want to use cStringUsingEncoding: with NSASCIIStringEncoding if you are going to end up using std::string. You can use UTF-8 with normal std::strings, but keep in mind that those operate on bytes and not on characters or even graphemes. For a good "getting started", check out this question and its answer.

Also note, if you have a string that can't be represented as ASCII but you still want it in an std::string and you don't want non-ASCII characters in there, you can use dataUsingEncoding:allowLossyConversion: to get an NSData representation of the string with lossy encoded ASCII content, and then throw that at your std::string

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