NSString与Char的类型互转

string 转成 char:  
char mychar[100];  
NSString * mystring;  
strcpy(mychar,(char *)[mystring UTF8String]);  
  
  
char 转成 string:  
NSString *TempString;  
char mychar[100];  
mystring=[NSString stringWithFormat:@"%s",mychar];