C++ char*，const char*，string的相互转换

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C++ char*，const char*，string的相互转换

1. 1. string转const char*
   
2. string s ="abc";
   
3. const char* c_s = s.c_str();
   
4. 
   
5. 2. const char*转string
   
6. const char* c_s ="abc";
   
7. string s(c_s);
   
8. 
   
9. 3. string转char*
   
10. string s ="abc";
    
11. char* c;
    
12. const int len = s.length();
    
13. c =new char[len+1];
    
14. strcpy(c,s.c_str());
    
15. 
    
16. 4. char*转string
    
17. char* c ="abc";
    
18. string s(c);
    
19. 
    
20. 5. const char*转char*
    
21. const char* cpc ="abc";
    
22. char* pc =new char[100];//足够长
    
23. strcpy(pc,cpc);

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参考：
【1】https://www.cnblogs.com/wuyepeng/p/9729943.html

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1. string path = path_buff;
   
2.     path = path + "\\sky.jpg";
   
3. 
   
4.     int charlength = strlen(path.c_str()) + 1;
   
5.     char* strc = new char[charlength];
   
6.     strcpy_s(strc, charlength, path.c_str());
   
7.     return strc;

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1. string path = path_buff;
   
2.     path = path + "\\sky.jpg";
   
3. 
   
4.     int charlength = strlen(path.c_str()) + 1;
   
5.     char* strc = new char[charlength];
   
6.     strcpy(strc, path.c_str());
   
7.     return strc;

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