C_str ()

The prototype of the 1.string class member function c_str ():

Const Char *c_str ()const; // returns a null-terminated C string

The 2.c_str () function returns a pointer to a regular C string that is the same as the object of the string class, and is able to convert a string object to the style of a string in C by using the C_STR () function of the string class;  

The C_STR () function returns a pointer to the normal C string with the same contents as this string string.

This is to be compatible with the C language, there is no string type in C, so the string object must be converted to a string style in C by using the member function C_str () of the String class object.  

Note: Be sure to use the strcpy () function and so on to manipulate the pointer returned by the method C_str ()

• For example: It's best not to:  

Char*string s="1234"= S.c_str//  c The last point of the content is garbage, because S object is destructor, its content is processed

• This should be used:

Char c[]; string s="1234";  strcpy(c,s.c_str());

So that there is no error, C_STR () returns a temporary pointer that cannot be manipulated

Excerpt from: http://blog.csdn.net/zhangfn2011/article/details/6364750

C_str ()