vc 字符串的处理函数

1.读Edit控件里的内容：                               

   char m[20];                            

   GetDlgItemText(ID,m,5);///////////////将地址为ID的控件里的内容的的前4位放进字符数组m中         

                       ////// int GetDlgItemText( int nID , CString& rString ) const;这是另一种用法                  

   MessageBox(m,"11",0);//输出m

2.判断字符数组中字符的个数                     

                      char data[] = "This is a true story.";/////第一一个字符数组             

                              char * p = data;///指向data的字符指针  （p是地址，*p是内容）                      

                     int i=0;////////用来计算字符的个数                                      

     while(*p!=0)/////////////判断结尾字读0在哪个位上                         

                  {i++;p++;}     该程序可用函数实现：                         

                int  len;                              

   len = strlen(data);

3.用MessageBox显示刚才的字符数组的长度           

      char display[10];                                                              

  sprintf( display , "%d" , len );/////////////////将len以十进制放进display里                                                           

     MessageBox(display,"显示字符数组的长度",0);