C++ 使用 getline 和 while 循环拆分字符串
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use getline and while loop to split a string
提问by Xitrum
for example i have a string:
例如我有一个字符串：
string s = "apple | orange | kiwi";
and i searched and there is a way:
我搜索了一下，有一种方法：
stringstream stream(s);
string tok;
getline(stream, tok, '|');
but it only can return the first token "apple" I wonder that is there any way so it can return an array of string? Thank you. Let assume that the string s may be changed. For exammple, string s = "apple | orange | kiwi | berry";
但它只能返回第一个标记“苹果”我想知道有什么方法可以返回一个字符串数组吗？谢谢你。假设字符串 s 可能会改变。例如，字符串 s = "apple | orange | kiwi | berry";
回答by Lightness Races in Orbit
As Benjamin points out, you answered this question yourself in its title.
正如 Benjamin 指出的那样，您自己在标题中回答了这个问题。
#include <sstream>
#include <vector>
#include <string>
int main() {
// inputs
std::string str("abc:def");
char split_char = ':';
// work
std::istringstream split(str);
std::vector<std::string> tokens;
for (std::string each; std::getline(split, each, split_char); tokens.push_back(each));
// now use `tokens`
}
Note that your tokens will still have the trailing/leading <space>characters. You may want to strip them off.
请注意，您的令牌仍将具有尾随/前导<space>字符。你可能想把它们剥掉。
回答by Nawaz
Since there is space between each word and |, you can do this:
由于每个单词 和 之间有空格|，您可以这样做：
string s = "apple | orange | kiwi";
stringstream ss(s);
string toks[3];
string sep;
ss >> toks[0] >> sep >> toks[1] >> sep >> toks[2];
cout << toks[0] <<", "<< toks[1] <<", " << toks[2];
Output:
输出：
apple, orange, kiwi
Demo : http://www.ideone.com/kC8FZ
演示：http: //www.ideone.com/kC8FZ
Note: it will work as long as there is atleast one space between each word and |. That means, it will NOT work if you've this:
注意：只要每个单词和 之间至少有一个空格，它就会起作用|。这意味着，如果你有这个，它就行不通：
string s = "apple|orange|kiwi";
Boost is a good if you want robust solution. And if you don't want to use boost for whatever reason, then I would suggest you to see this blog:
如果你想要健壮的解决方案，Boost 是一个很好的选择。如果您出于任何原因不想使用 boost，那么我建议您查看此博客：
Elegant ways to tokenize strings
It explains how you can tokenize your strings, with just one example.
它仅通过一个示例说明了如何标记字符串。
