简单的libxml2 HTML解析示例,使用Objective-c,Xcode和HTMLparser.h

请有人向我显示一个使用libxml解析一些 HTML的简单示例.

#import <libxml2/libxml/HTMLparser.h>

NSString *html = @"<ul>"
    "<li><input type=\"image\" name=\"input1\" value=\"string1value\" /></li>"
    "<li><input type=\"image\" name=\"input2\" value=\"string2value\" /></li>"
  "</ul>"
  "<span class=\"spantext\"><b>Hello World 1</b></span>"
  "<span class=\"spantext\"><b>Hello World 2</b></span>";

1)说我想解析name = input2的输入的值.

应输出“string2value”.

2)说我想解析每个跨标签的class = spantext的内容.

应输出：“Hello World 1”和“Hello World 2”.

解决方法

我使用本里维斯 HTML Parser来实现我想要的：

NSError *error = nil;
NSString *html = 
    @"<ul>"
        "<li><input type='image' name='input1' value='string1value' /></li>"
        "<li><input type='image' name='input2' value='string2value' /></li>"
    "</ul>"
    "<span class='spantext'><b>Hello World 1</b></span>"
    "<span class='spantext'><b>Hello World 2</b></span>";
HTMLParser *parser = [[HTMLParser alloc] initWithString:html error:&error];

if (error) {
    NSLog(@"Error: %@",error);
    return;
}

HTMLNode *bodyNode = [parser body];

NSArray *inputNodes = [bodyNode findChildTags:@"input"];

for (HTMLNode *inputNode in inputNodes) {
    if ([[inputNode getAttributeNamed:@"name"] isEqualToString:@"input2"]) {
        NSLog(@"%@",[inputNode getAttributeNamed:@"value"]); //Answer to first question
    }
}

NSArray *spanNodes = [bodyNode findChildTags:@"span"];

for (HTMLNode *spanNode in spanNodes) {
    if ([[spanNode getAttributeNamed:@"class"] isEqualToString:@"spantext"]) {
        NSLog(@"%@",[spanNode allContents]); //Answer to second question
    }
}

[parser release];