null-terminated | 易学教程

How to get a null terminated string from a C# string?

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问题 I am communicating with a server who needs null terminated string How can I do this smartly in C#? 回答1: I assume you're implementing some kind of binary protocol, if the strings are null terminated. Are you using a BinaryWriter ? The default BinaryWriter writes strings as length prefixed. You can change that behavior: class MyBinaryWriter : BinaryWriter { private Encoding _encoding = Encoding.Default; public override void Write(string value) { byte[] buffer = _encoding.GetBytes(value); Write

Why do strings in C need to be null terminated?

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问题 Just wondering why this is the case. I'm eager to know more about low level languages, and I'm only into the basics of C and this is already confusing me. Do languages like PHP automatically null terminate strings as they are being interpreted and / or parsed? 回答1: From Joel's excellent article on the topic: Remember the way strings work in C: they consist of a bunch of bytes followed by a null character, which has the value 0. This has two obvious implications: There is no way to know where

String termination - char c=0 vs char c='\0'

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问题 When terminating a string, it seems to me that logically char c=0 is equivalent to char c=\'\\0\' , since the \"null\" (ASCII 0) byte is 0 , but usually people tend to do \'\\0\' instead. Is this purely out of preference or should it be a better \"practice\"? What is the preferred choice? EDIT: K&R says : \"The character constant \'\\0\' represents the character with value zero, the null character. \'\\0\' is often written instead of 0 to emphasize the character nature of some expression, but

What is a null-terminated string?

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How does it differ from std::string ? A null-terminated string is a contiguous sequence of characters, the last one of which has the binary bit pattern all zeros. I'm not sure what you mean by a "usual string", but if you mean std::string , then a std::string is not required ( until C++11 ) to be contiguous, and is not required to have a terminator. Also, a std::string 's string data is always allocated and managed by the std::string object that contains it; for a null-terminated string, there is no such container, and you typically refer to and manage such strings using bare pointers. All of

What's the rationale for null terminated strings?

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As much as I love C and C++, I can't help but scratch my head at the choice of null terminated strings: Length prefixed (i.e. Pascal) strings existed before C Length prefixed strings make several algorithms faster by allowing constant time length lookup. Length prefixed strings make it more difficult to cause buffer overrun errors. Even on a 32 bit machine, if you allow the string to be the size of available memory, a length prefixed string is only three bytes wider than a null terminated string. On 16 bit machines this is a single byte. On 64 bit machines, 4GB is a reasonable string length

What is a null-terminated string?

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问题 How does it differ from std::string? 回答1: A null-terminated string is a contiguous sequence of characters, the last one of which has the binary bit pattern all zeros. I'm not sure what you mean by a "usual string", but if you mean std::string , then a std::string is not required (until C++11) to be contiguous, and is not required to have a terminator. Also, a std::string 's string data is always allocated and managed by the std::string object that contains it; for a null-terminated string,

What's the rationale for null terminated strings?

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问题 As much as I love C and C++, I can\'t help but scratch my head at the choice of null terminated strings: Length prefixed (i.e. Pascal) strings existed before C Length prefixed strings make several algorithms faster by allowing constant time length lookup. Length prefixed strings make it more difficult to cause buffer overrun errors. Even on a 32 bit machine, if you allow the string to be the size of available memory, a length prefixed string is only three bytes wider than a null terminated

Will std::string always be null-terminated in C++11?

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In a 2008 post on his site, Herb Sutter states the following: There is an active proposal to tighten this up further in C++0x and require null-termination and possibly ban copy-on-write implementations, for concurrency-related reasons. Here’s the paper: http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2534.html . I think that one or both of the proposals in this paper is likely to be adopted, but we’ll see at the next meeting or two. I know that C++11 now guarantees that the std::string contents get stored contiguously, but did they adopt the above in the final draft? Will it now be

Will std::string always be null-terminated in C++11?

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问题 In a 2008 post on his site, Herb Sutter states the following: There is an active proposal to tighten this up further in C++0x and require null-termination and possibly ban copy-on-write implementations, for concurrency-related reasons. Here’s the paper: http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2534.html . I think that one or both of the proposals in this paper is likely to be adopted, but we’ll see at the next meeting or two. I know that C++11 now guarantees that the std: