QT学习3:c++解析html相关

1.c++好像没有太多的html解析库可以用，最后试着在qt里面集成了htmlcxx，一开始在pro里面写了 includepath += 路径，发现仍然没有用

后来发现只要在 HEADERS 和 SOURCES 里面 把htmlcxx的c文件和.h文件 +=进去就行了，像这样:

SOURCES += main.cpp\

        html/utils.cc \

        html/Uri.cc \

        html/ParserSax.cc \

        html/ParserDom.cc \

        html/Node.cc \

        html/Extensions.cc

HEADERS  += mainwindow.h \

        html/utils.h \

        html/Uri.h \

        html/tree.h \

        html/ParserSax.h \

        html/ParserDom.h \

        html/Node.h \

        html/Extensions.h \

        html/debug.h \

        html/ci_string.h \

        html/wincstring.h \

        html/tld.h

参考了:   htmlcxx for qt(mingw)      http://blog.chinaunix.net/uid-21525518-id-1824657.html

2.使用gumbo解析

导入c和h文件方法同上，记一下gumbo常用类型

GumboOutput   

用GumboOutput来解析html源码，然后output->root即为根节点。

GumboOutput* output = gumbo_parse(htmlString.c_str());

GumboNode* node = output->root

GumboNode    节点                      

GumboNode node;      

获得节点里面的东西    

node->v->text                           //  节点的文本

node->v.element.children    // 获得节点的子节点列表

node->type     //节点的类型

GumboVector    节点容器  

比如可以   GumboVector  * children  =    node->v.element.children;   来获得节点的子节点列表

(GumboNode*) ( children->data[i] )     //获得这个节点列表的第i个节点   

GumboAttribute  节点属性

GumboAttribute* href;  

if (node->v.element.tag == GUMBO_TAG_A &&   (href = gumbo_get_attribute(&node->v.element.attributes, "href"))) 

{    std::cout << href->value << std::endl;  }

节点的类型  

1.   ELEMENT_NODE，普通元素节点，如,

   ,

   ,,  
2.   ATTRIBUTE_NODE，元素属性  
3.   TEXT_NODE，文本节点  
4.   CDATA_SECTION_NODE，即  
5.   ENTITY_REFERENCE_NODE，实体引用，如&   
6.   ENTITY_NODE，实体，如  
7.   PROCESSING_INSTRUCTION_NODE，PI，处理指令，如  
8.   COMMENT_NODE，注释  
9.   DOCUMENT_NODE，根节点，即document.nodeType  
10.   DOCUMENT_TYPE_NODE，DTD，文档类型  
11.   DOCUMENT_FRAGMENT_NODE，文档片段  
12.   NOTATION_NODE，DTD中定义的记号  

在代码里的节点类型可以有如下几种           (使用方法       node->type ==  GUMBO_NODE_ELEMENT )

typedef enum {

  /** Document node.  v will be a GumboDocument. */

  GUMBO_NODE_DOCUMENT,

  /** Element node.  v will be a GumboElement. */

  GUMBO_NODE_ELEMENT,

  /** Text node.  v will be a GumboText. */

  GUMBO_NODE_TEXT,

  /** CDATA node. v will be a GumboText. */

  GUMBO_NODE_CDATA,

  /** Comment node.  v. will be a GumboText, excluding comment delimiters. */

  GUMBO_NODE_COMMENT,

  /** Text node, where all contents is whitespace.  v will be a GumboText. */

  GUMBO_NODE_WHITESPACE

} GumboNodeType;

标签类型:                           (使用方法    node->v.element.tag != GUMBO_TAG_SCRIPT   )

typedef enum {

  // http://www.whatwg.org/specs/web-apps/current-work/multipage/semantics.html#the-root-element

  GUMBO_TAG_HTML,

  // http://www.whatwg.org/specs/web-apps/current-work/multipage/semantics.html#document-metadata

  GUMBO_TAG_HEAD,

  GUMBO_TAG_TITLE,

  GUMBO_TAG_BASE,

  GUMBO_TAG_LINK,

  GUMBO_TAG_META,

  GUMBO_TAG_STYLE,

  // http://www.whatwg.org/specs/web-apps/current-work/multipage/scripting-1.html#scripting-1

  GUMBO_TAG_SCRIPT,

  GUMBO_TAG_NOSCRIPT,

  GUMBO_TAG_TEMPLATE,

  // http://www.whatwg.org/specs/web-apps/current-work/multipage/sections.html#sections

  GUMBO_TAG_BODY,

  GUMBO_TAG_ARTICLE,

  GUMBO_TAG_SECTION,

  GUMBO_TAG_NAV,

  GUMBO_TAG_ASIDE,

  GUMBO_TAG_H1,

  GUMBO_TAG_H2,

  GUMBO_TAG_H3,

  GUMBO_TAG_H4,

  GUMBO_TAG_H5,

  GUMBO_TAG_H6,

  GUMBO_TAG_HGROUP,

  GUMBO_TAG_HEADER,

  GUMBO_TAG_FOOTER,

  GUMBO_TAG_ADDRESS,

  // http://www.whatwg.org/specs/web-apps/current-work/multipage/grouping-content.html#grouping-content

  GUMBO_TAG_P,

  GUMBO_TAG_HR,

  GUMBO_TAG_PRE,

  GUMBO_TAG_BLOCKQUOTE,

  GUMBO_TAG_OL,

  GUMBO_TAG_UL,

  GUMBO_TAG_LI,

  GUMBO_TAG_DL,

  GUMBO_TAG_DT,

  GUMBO_TAG_DD,

  GUMBO_TAG_FIGURE,

  GUMBO_TAG_FIGCAPTION,

  GUMBO_TAG_MAIN,

  GUMBO_TAG_DIV,

  // http://www.whatwg.org/specs/web-apps/current-work/multipage/text-level-semantics.html#text-level-semantics

  GUMBO_TAG_A,

  GUMBO_TAG_EM,

  GUMBO_TAG_STRONG,

  GUMBO_TAG_SMALL,

  GUMBO_TAG_S,

  GUMBO_TAG_CITE,

  GUMBO_TAG_Q,

  GUMBO_TAG_DFN,

  GUMBO_TAG_ABBR,

  GUMBO_TAG_DATA,

  GUMBO_TAG_TIME,

  GUMBO_TAG_CODE,

  GUMBO_TAG_VAR,

  GUMBO_TAG_SAMP,

  GUMBO_TAG_KBD,

  GUMBO_TAG_SUB,

  GUMBO_TAG_SUP,

  GUMBO_TAG_I,

  GUMBO_TAG_B,

  GUMBO_TAG_U,

  GUMBO_TAG_MARK,

  GUMBO_TAG_RUBY,

  GUMBO_TAG_RT,

  GUMBO_TAG_RP,

  GUMBO_TAG_BDI,

  GUMBO_TAG_BDO,

  GUMBO_TAG_SPAN,

  GUMBO_TAG_BR,

  GUMBO_TAG_WBR,

  // http://www.whatwg.org/specs/web-apps/current-work/multipage/edits.html#edits

  GUMBO_TAG_INS,

  GUMBO_TAG_DEL,

  // http://www.whatwg.org/specs/web-apps/current-work/multipage/embedded-content-1.html#embedded-content-1

  GUMBO_TAG_IMAGE,

  GUMBO_TAG_IMG,

  GUMBO_TAG_IFRAME,

  GUMBO_TAG_EMBED,

  GUMBO_TAG_OBJECT,

  GUMBO_TAG_PARAM,

  GUMBO_TAG_VIDEO,

  GUMBO_TAG_AUDIO,

  GUMBO_TAG_SOURCE,

  GUMBO_TAG_TRACK,

  GUMBO_TAG_CANVAS,

  GUMBO_TAG_MAP,

  GUMBO_TAG_AREA,

  // http://www.whatwg.org/specs/web-apps/current-work/multipage/the-map-element.html#mathml

  GUMBO_TAG_MATH,

  GUMBO_TAG_MI,

  GUMBO_TAG_MO,

  GUMBO_TAG_MN,

  GUMBO_TAG_MS,

  GUMBO_TAG_MTEXT,

  GUMBO_TAG_MGLYPH,

  GUMBO_TAG_MALIGNMARK,

  GUMBO_TAG_ANNOTATION_XML,

  // http://www.whatwg.org/specs/web-apps/current-work/multipage/the-map-element.html#svg-0

  GUMBO_TAG_SVG,

  GUMBO_TAG_FOREIGNOBJECT,

  GUMBO_TAG_DESC,

  // SVG title tags will have GUMBO_TAG_TITLE as with HTML.

  // http://www.whatwg.org/specs/web-apps/current-work/multipage/tabular-data.html#tabular-data

  GUMBO_TAG_TABLE,

  GUMBO_TAG_CAPTION,

  GUMBO_TAG_COLGROUP,

  GUMBO_TAG_COL,

  GUMBO_TAG_TBODY,

  GUMBO_TAG_THEAD,

  GUMBO_TAG_TFOOT,

  GUMBO_TAG_TR,

  GUMBO_TAG_TD,

  GUMBO_TAG_TH,

  // http://www.whatwg.org/specs/web-apps/current-work/multipage/forms.html#forms

  GUMBO_TAG_FORM,

  GUMBO_TAG_FIELDSET,

  GUMBO_TAG_LEGEND,

  GUMBO_TAG_LABEL,

  GUMBO_TAG_INPUT,

  GUMBO_TAG_BUTTON,

  GUMBO_TAG_SELECT,

  GUMBO_TAG_DATALIST,

  GUMBO_TAG_OPTGROUP,

  GUMBO_TAG_OPTION,

  GUMBO_TAG_TEXTAREA,

  GUMBO_TAG_KEYGEN,

  GUMBO_TAG_OUTPUT,

  GUMBO_TAG_PROGRESS,

  GUMBO_TAG_METER,

  // http://www.whatwg.org/specs/web-apps/current-work/multipage/interactive-elements.html#interactive-elements

  GUMBO_TAG_DETAILS,

  GUMBO_TAG_SUMMARY,

  GUMBO_TAG_MENU,

  GUMBO_TAG_MENUITEM,

  // Non-conforming elements that nonetheless appear in the HTML5 spec.

  // http://www.whatwg.org/specs/web-apps/current-work/multipage/obsolete.html#non-conforming-features

  GUMBO_TAG_APPLET,

  GUMBO_TAG_ACRONYM,

  GUMBO_TAG_BGSOUND,

  GUMBO_TAG_DIR,

  GUMBO_TAG_FRAME,

  GUMBO_TAG_FRAMESET,

  GUMBO_TAG_NOFRAMES,

  GUMBO_TAG_ISINDEX,

  GUMBO_TAG_LISTING,

  GUMBO_TAG_XMP,

  GUMBO_TAG_NEXTID,

  GUMBO_TAG_NOEMBED,

  GUMBO_TAG_PLAINTEXT,

  GUMBO_TAG_RB,

  GUMBO_TAG_STRIKE,

  GUMBO_TAG_BASEFONT,

  GUMBO_TAG_BIG,

  GUMBO_TAG_BLINK,

  GUMBO_TAG_CENTER,

  GUMBO_TAG_FONT,

  GUMBO_TAG_MARQUEE,

  GUMBO_TAG_MULTICOL,

  GUMBO_TAG_NOBR,

  GUMBO_TAG_SPACER,

  GUMBO_TAG_TT,

  // Used for all tags that don't have special handling in HTML.

  GUMBO_TAG_UNKNOWN,

  // A marker value to indicate the end of the enum, for iterating over it.

  // Also used as the terminator for varargs functions that take tags.

  GUMBO_TAG_LAST,

} GumboTag;

3.使用gumbo的时候，报了一个RtlWerpReportException failed with status code :-1073741823 错，

一开始以为是堆栈溢出的问题，后来发现是自己代码逻辑没写对，最好对照着官方demo的用法去写

if (node->v.element.tag == GUMBO_TAG_A &&      (href = gumbo_get_attribute(&node->v.element.attributes, "href"))) 

{    std::cout << href->value << std::endl;  }

4.编译gumbo的时候报了一个错

 错误:'for' loop initial declarations are only allowed in C99 mode

所以在项目pro配置里要加上这两句

QMAKE_CFLAGS_DEBUG +=  --std=c99

QMAKE_CFLAGS_RELEASE +=  --std=c99