ios中16进制转10进制

-(int)ToHex:(NSString*)tmpid

{

   int int_ch;

    

   unichar hex_char1 = [tmpid characterAtIndex:0]; ////两位16进制数中的第一位(高位*16)

   int int_ch1;

   if(hex_char1 >= '0'&& hex_char1 <='9')

        int_ch1 = (hex_char1-48)*16;  //// 0 的Ascll - 48

   else if(hex_char1 >='A'&& hex_char1 <='F')

    int_ch1 = (hex_char1-55)*16;//// A 的Ascll - 65

   else

        int_ch1 = (hex_char1-87)*16;//// a 的Ascll - 97

    

    

   unichar hex_char2 = [tmpid characterAtIndex:1]; ///两位16进制数中的第二位(低位)

   int int_ch2;

   if(hex_char2 >= '0'&& hex_char2 <='9')

        int_ch2 = (hex_char2-48);//// 0 的Ascll - 48

   else if(hex_char1 >='A'&& hex_char1 <='F')

    int_ch2 = hex_char2-55;//// A 的Ascll - 65

   else

        int_ch2 = hex_char2-87;//// a 的Ascll - 97

    

    int_ch = int_ch1+int_ch2;

   NSLog(@"int_ch=%d",int_ch);

    

   return int_ch;

}