C++中将字符串转换为Cstring
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Converting String to Cstring in C++
提问by teamaster
I have a string to convert, string = "apple"and want to put that into a C string of this style, char *c, that holds {a, p, p, l, e, '\0'}. Which predefined method should I be using?
我有一个要转换的字符串，string = "apple"并想将其放入这种样式的 C 字符串中char *c， , 包含{a, p, p, l, e, '\0'}. 我应该使用哪种预定义方法？
回答by Yann Ramin
.c_str()returns a const char*. If you need a mutable version, you will need to produce a copy yourself.
.c_str()返回一个const char*. 如果你需要一个可变版本，你需要自己制作一个副本。
回答by bytemaster
vector<char> toVector( const std::string& s ) {
string s = "apple";
vector<char> v(s.size()+1);
memcpy( &v.front(), s.c_str(), s.size() + 1 );
return v;
}
vector<char> v = toVector(std::string("apple"));
// what you were looking for (mutable)
char* c = v.data();
.c_str() works for immutable. The vector will manage the memory for you.
.c_str() 适用于不可变。该向量将为您管理内存。
回答by Ritchie Shatter
string name;
char *c_string;
getline(cin, name);
c_string = new char[name.length()];
for (int index = 0; index < name.length(); index++){
c_string[index] = name[index];
}
c_string[name.length()] = '##代码##';//add the null terminator at the end of
// the char array
I know this is not the predefined method but thought it may be useful to someone nevertheless.
我知道这不是预定义的方法，但认为它可能对某人有用。
