Question

我正在使用nsxmlparser解析rss，我想从rss中获取一些图像...我该怎么做？

所以这里是一个rss的例子

<p><img scr = "IMGURL"></p>

我怎样才能获得“IMGURL”

感谢， TC

Answer 1

您需要使用像XQuery这样的xml解析器。查询将是：/ p / img @src 您可以使用以下功能：

NSString *stringForXQuery(NSXMLNode *node, NSString *query)
{
    NSArray *results = [node objectsForXQuery:query constants:nil error:nil];
    NSUInteger howManyResults = [results count];
    if (howManyResults != 1) {
        return nil;
    }
    return [[results objectAtIndex:0] stringValue];
}

并称之为：

NSString *imgURL = stringForXQuery([yourxmldocument rootElement], @"/p/img@src");

Answer 2

这是一个快速入侵 - 只有当你知道字符串不会改变位置时才这样做。否则你冒着崩溃的风险。

//for demo purposes lets say your <p><img scr = "IMGURL"></p> is a string named sourceString
//chop it up into an array like this and grab it from the arrays position

//create an array 
NSArray *tempArray = [sourceString componentsSeparatedByString:@"\""];

//what this has done, it has create an array of objects from your source string separated by "
//so in your tempArray you will have two objects
// objectAtIndex 0  will be: <p><img scr =    you wont need this so we can ignore it
// objectAtIndex 1  will be the string you want. it will be: IMGURL
// so now you can quickly create a string from it like this
NSString * imgURL = [[tempArray objectAtIndex:1]description];

这是一个快速而肮脏的伎俩......但它有效！只要数据保持相同的格式。你的电话！

NSXMLParser rss图片网址？

2 个答案: