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一、string->char*
1、将string转char*，可以使用string提供的c_str()或者data()
函数。其中c_str()函数返回一个以'\0'结尾的字符数组，而data()仅返回字符串内容，而不含有结束符'\0'。
2、const char* c_str();
c_str()函数返回一个指向C字符串的指针，该指针指向内存内容和string
相同。因为c语言不支持string类型，故为了在c++兼容C字符串，提供了c_str()函数来实现转换。注意一定要使用strcpy()函数来操作c_str()；
c_str()返回的是一个临时指针，不能对其进行操作。
char ch[20]; string s="123456"; strcpy(ch,s.c_str());
c_str()以char* 形式传回string内含字符串
如果一个函数要求char*参数，可以使用c_str()方法：
string str="123456"; printf("%s",str.c_str()); const char* p=a.data(); const
char* p=a.c_str(); char* p=const_cast<char*>(a_str());
二、char*-->string
直接赋值
string s; char* p ="hello"; s = p;
三、string-->char[]
string pp = "dagah"; char p[8]; int i; for( i=0;i<pp.length();i++) p[i] =
pp[i]; p[i] = '\0'; printf("%s\n",p); cout<<p;
四、char[] 转string
直接赋值即可。
