从字符串到字符的转换 - C++
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Conversion from string to char - c++
提问by ModdedLife
For a program I'm writing based on specifications, a variable is passed in to a function as a string. I need to set that string to a char variable in order to set another variable. How would I go about doing this?
对于我根据规范编写的程序，将变量作为字符串传递给函数。我需要将该字符串设置为 char 变量以设置另一个变量。我该怎么做呢？
This is it in the header file:
这是头文件中的内容：
void setDisplayChar(char displayCharToSet);
this is the function that sets it:
这是设置它的函数：
void Entity::setElementData(string elementName, string value){
if(elementName == "name"){
setName(value);
}
else if(elementName == "displayChar"){
// char c;
// c = value.c_str();
setDisplayChar('x');//cant get it to convert :(
}
else if(elementName == "property"){
this->properties.push_back(value);
}
}
Thanks for the help in advanced!
感谢您在高级方面的帮助！
回答by paxdiablo
You can get a specific character from a string simply by indexing it. For example, the fifth character of stris str[4](off by one since the first character is str[0]).
您可以通过索引字符串从字符串中获取特定字符。例如，的第五个字符str是str[4]（由于第一个字符是str[0]）。
Keep in mind you'll run into problems if the string is shorter than your index thinks it is.
请记住，如果字符串比您的索引认为的短，您会遇到问题。
c_str(), as you have in your comments, gives you a char*representation (the whole string as a C "string", more correctly a pointer to the first character) rather than a char.
c_str()，正如您在评论中所言，为您提供了一个char*表示（整个字符串作为 C“字符串”，更准确地说是指向第一个字符的指针）而不是char.
You could equally index that but there's no point in this particular case.
你可以同样地索引它，但在这种特殊情况下没有意义。
回答by Luis Tellez
you just need to use value[0] and that returns the first char.
您只需要使用 value[0] 并返回第一个字符。
char c = value[0];
