C++ 中char*，const char*，string 轉換

1. string转const char*

string s = "abc";
const char* c_s = s.c_str();


2. const char*转string
   直接赋值即可

const char* c_s = "abc";
string s(c_s);


3. string转char*

string s = "abc";
char* c;
const int len = s.length();
c = new char[len+1];
strcpy(c,s.c_str());


4. char*转string

char* c = "abc";
string s(c);


5. const char*转char*

const char* cpc = "abc";
char* pc = new char[100];//足够长
strcpy(pc,cpc);


6. char*转const char*
   直接赋值即可

char* pc = "abc";
const char* cpc = pc;