NSString 与 C++ string字符串的互转

  1.C++ string 转换为 NSString  

　　 std::string str("hello");
    // NSString *str = [NSString stringWithString:str.c_str()];
   　　 NSString *ocstr = [NSStringstringWithCString:str.c_str() encoding:NSUTF8StringEncoding];


　　 NSString *istr = [NSString stringWithString:@"zsh"];
    str = [istr cStringUsingEncoding:NSUTF8StringEncoding];

 2. NSString 转换为C 字符串

    const char* destDir = [filepath UTF8String];
   //  NSURL *soundUrl=[[NSURL alloc] initFileURLWithPath:s]; 


3. const char* to NSString

   char *str ="abc";
   NSString *s = [NSString stringWithUTF8String:str];

 　 NSString *path = [[NSBundle mainBundle]pathForResource:@"nokia" ofType:@"mp3"];
    char *tempPath = (char*)malloc(sizeof(path)+1);
  
    NSString *soundPath = [[NSBundle mainBundle] pathForResource:@mp3"]; 
    
    NSString *dirStr = [NSString stringWithFormat:@"%s",path];
    NSString *filepath = [[NSBundle mainBundle] pathForResource:dirStr ofType:nil];
    NSLog(filepath);