从字符串中删除N个第一个字符

I want to delete the first 10 chars from a string in C++. How can I do that?

我想从C ++中的字符串中删除前10个字符。我怎样才能做到这一点?

3 个解决方案

#1

Like this:

str.erase(0,10);

...

#2

Use std::string::substr:

try {
   str = str.substr(10);
} catch (std::out_of_range&) {
     //oops str is too short!!!
}

http://www.cplusplus.com/reference/string/string/substr/

#3

I suspect that there is more code here that you are not showing, and the problem is likely there.

我怀疑这里有更多的代码,你没有展示,问题很可能就在那里。

This code works just fine:

这段代码很好用:

#include <string>
#include <iostream>

using namespace std;

int main(int argc, char **argv)
{
    string imgURL = "<img src=\"http://imgs.xkcd.com/comics/sky.png";

    string str = imgURL;
    int urlLength = imgURL.length();
    urlLength = urlLength-10;
    str.erase (str.begin(), str.end()-urlLength);
    imgURL = str;

    cout << imgURL << endl;

    return 0;
}

With that said, there are shorter ways to do this, as others have mentioned.

话虽如此,正如其他人所提到的那样,有更短的方法可以做到这一点。

#1