NSXMLParser 示例

问题描述

我有一个这样的 XML

I have an XML like this

<IS>
    <Value>
        <Signature>-804</Signature>
        <Amount>139</Amount>
    </Value>
    <Value>
        <Signature>-845</Signature>
        <Amount>639466</Amount>
    </Value>
    <Value>
        <Signature>-811</Signature>
        <Amount>16438344</Amount>
    </Value>
    <Value>
        <Signature>-1115</Signature>
        <Amount>-159733</Amount>
    </Value>
</IS>

现在我只想从中解析特定的值.例如，如何获取具有对应签名的节点的值 -804

Now I want to parse only specific values from this. For example, how do I get the value for the node having corresponding signature as -804

请帮帮我..

我知道 NSXMLParser 的基础知识，但不知道如何实现条件解析.

I know the basics of NSXMLParser, but do not know how to acheive conditional parsing.

谢谢.

推荐答案

- (void)parser:(NSXMLParser *)parser didStartElement:(NSString *)elementName namespaceURI:(NSString *)namespaceURI qualifiedName:(NSString *)qName attributes:(NSDictionary *)attributeDict{
    currentKey = nil;
    [currentStringValue release];
    currentStringValue = nil;
    if([elementName isEqualToString:@"Value"]){
        //alloc some object to parse value into
    } else if([elementName isEqualToString:@"Signature"]){
        currentKey = @"Signature";
        return;
    }
}

- (void)parser:(NSXMLParser *)parser foundCharacters:(NSString *)string{
    if(currentKey){
        if(!currentStringValue){
            currentStringValue = [[NSMutableString alloc] initWithCapacity:200];
        }
        [currentStringValue appendString:string];
    }
}

-(void)parser:(NSXMLParser *)parser didEndElement:(NSString *)elementName namespaceURI:(NSString *)namespaceURI qualifiedName:(NSString *)qName{
    if([elementName isEqualToString:@"Signature"] && [currentStringValue intValue] == 804){
        ivar.signature = [currentStringValue intValue];
        return;
    }
}

类似的东西.注意我还没有在编译器上真正测试过这段代码，所以这里会有语法错误 &那里.

Something like this.Note I havent really tested this code on compiler so there will be syntax errors here & there.

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