读取字符串长度

//字符串中的字符长度 - (int)convertToInt:(NSString *)strTemp {      
 int strLength = 0;   
 char *p = (char *)[strTemp cStringUsingEncoding:NSUnicodeStringEncoding];  
  for (int i = 0 ; i < [strTemplengthOfBytesUsingEncoding:NSUnicodeStringEncoding]; i++) {     
   if (*p) {         
         p++;            
         strLength++;      
  }
   else {         
         p++;       
     }    
   }    
        return strLength;
}