处理URL中的中文等字符，计算含有中英文的字符串的长度

使用ASIHttpRequest进行网络请求的时候，如果包含的参数中含有中文，可调用如下方法对汉字进行处理

- (NSString*)URLEncode:(NSString *)originalString{
    NSArray *escapeChars = [NSArray arrayWithObjects:@";" , @"/" , @"?" , @":" ,
                            @"@" , @"&" , @"=" , @"+" ,    @"$" , @"," ,
                            @"!", @"'", @"(", @")", @"*", nil];
    
    NSArray *replaceChars = [NSArray arrayWithObjects:@"%3B" , @"%2F", @"%3F" , @"%3A" ,
                             @"%40" , @"%26" , @"%3D" , @"%2B" , @"%24" , @"%2C" ,
                             @"%21", @"%27", @"%28", @"%29", @"%2A", nil];
    
    int len = [escapeChars count];
    
    NSMutableString *temp = [[originalString
                              stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding]
                             mutableCopy];
    
    int i;
    for (i = 0; i < len; i++) {
        
        [temp replaceOccurrencesOfString:[escapeChars objectAtIndex:i]
                              withString:[replaceChars objectAtIndex:i]
                                 options:NSLiteralSearch
                                   range:NSMakeRange(0, [temp length])];
    }
    
    NSString *outStr = [NSString stringWithString: temp];
    
    return outStr;
}

计算含有中英文的字符串的长度（如输入：你好，字符串长度应为4）：

- (int)getToInt:(NSString*)strtemp
{
    NSStringEncoding enc = CFStringConvertEncodingToNSStringEncoding(kCFStringEncodingGB_18030_2000);
    NSData* da = [strtemp dataUsingEncoding:enc];
    NSLog(@"------%d",[da length]);
    return [da length];
}