html文件解析

[Mingway1991]

请问各位大牛，小弟的html解析哪里有问题，请指点一下，谢谢。
NSStringEncoding encoding = CFStringConvertEncodingToNSStringEncoding(kCFStringEncodingGB_18030_2000);

NSData *data = [[NSData alloc] initWithContentsOfFile:@"http://finance.sina.com.cn/china/20130519/140315511917.shtml"];
NSString* str = [[NSString alloc]initWithData:data encoding:encoding];
str = [str stringByReplacingOccurrencesOfString:@"\"gb2312\"" withString:@"\"utf-8\""];
NSData* newData = [str dataUsingEncoding:NSUTF8StringEncoding];
TFHpple * hpple= [[TFHpple alloc] initWithHTMLData:newData];
NSArray *elements = [hpple search:@"//h1"];
TFHppleElement *element = [elements objectAtIndex:0];
NSString *content = [element content];
NSLog(@"%@",content);

[Mingway1991]

写错了，这个才是 NSStringEncoding gbEncoding = CFStringConvertEncodingToNSStringEncoding(kCFStringEncodingGB_18030_2000); NSData *htmlData = [NSData dataWithContentsOfURL:[NSURL URLWithString:PATH]]; NSString *htmlStr = [[NSString alloc] initWithData:htmlData encoding:gbEncoding]; NSString *utf8HtmlStr = [htmlStr stringByReplacingOccurrencesOfString:@"<meta http-equiv=\"Content-type\" content=\"text/html; charset=gb2312\" />" withString:@"<meta http-equiv=\"Content-type\" content=\"text/html; charset=utf-8\">"]; NSData *htmlDataUTF8 = [utf8HtmlStr dataUsingEncoding:NSUTF8StringEncoding]; TFHpple *xpathParser = [[TFHpple alloc] initWithHTMLData:htmlDataUTF8]; NSArray *elements = [xpathParser searchWithXPathQuery:@"//h1"]; TFHppleElement *element = [elements objectAtIndex:0]; NSString *ele = [element content]; NSLog(@"%@",ele); 结果是null