字符串数字之间的转换

(1)string --> char *

   string str("OK");

   char * p = str.c_str();或

   char * p = str->getCString();

(2)char * -->string

   char *p = "OK";

   string str(p);

(3)char * -->CString

   char *p ="OK";

   CString m_Str(p);

   //或者

   CString m_Str;

   m_Str.Format("%s",p);

(4)CString --> char *

   CString str("OK");

   char * p = str.GetBuffer(0);

   ...

   str.ReleaseBuffer();

(5)string --> CString  

   CString.Format("%s", string.c_str());  

(6)CString --> string

   string s(CString.GetBuffer(0));  

   GetBuffer()后一定要ReleaseBuffer()，否则就没有释放缓冲区所占的空间，CString对象不能动态增长了。

(7)double/float->CString

   double data;

   CString.Format("%.2f",data); //保留2位小数

(8)CString->double

   CString s="123.12";

   double   d=atof(s);   

(9)string->double

  double d=atof(s.c_str());