OC NSString和C++ char *相互转换和传参数

• NSString与char相互转换

//NSString转换char  
  NSString * str1= @"Test";  
  const char * c1 =[str1 UTF8String];  
//char转换NSString  
  const char * c2 ="test";  
  NSString *str2 = [NSString stringWithUTF8String:c2];  

• char转换成16进制hex码:

NSString* str1=@"01 00 20 00 01 10 30 31 32 33 34 35 36 37 38 FF FF FF FF FF FF FF";  
    const char *str2=[str1 UTF8String];  
    unsigned char source[22];  
    int i;  
    int v;  
    for (i=0;i<22;i++) {  
        sscanf(str2+i*3,"%2X",&v);  
        source[i]=(unsigned char)v;  
        printf("%d=%X\n",i,source[i]);  
    }  

• 传入NSString对象值，char *作为方法参数

有链接教程：http://www.cnblogs.com/chenleiustc/archive/2011/04/09/2010647.html
    NSString *str = @"NSString转换为char并转换作为方法参数传递"
    const char *c1 =[str UTF8String];
    char *cc =(char*)&c1;//通过强制类型转换，将地址赋给变量，再作修改即可以改变const常量值。
    Test *pTest = new Test();
    pTest->init(cc);
    void init(char *str); // 方法含char参数