vc中操作Xml
http://www.firstobject.com/dn_markup.htm
DotNet中使用xml相对比较轻松,在vc中操作xml,有些繁琐。最近在网络上得知CMarkup比较好用,于是试了下,还好,就把部分例子写出来。以后有时间的话,再写清楚点。
1. 生成UserInfo.xml
- CMarkup xml;
- xml.SetDoc("<?xml version=\"1.0\" encoding=\"UTF-8\"?>\r\n");
- xml.AddElem("UserInfo");
- xml.IntoElem();
- xml.AddElem("UserID","luo");
- xml.AddElem("UserID","lin");
- xml.OutOfElem();
- xml.Save("UserInfo.xml");
2. 浏览特定元素
- //----查看所有UserID----
- CMarkup xml;
- xml.Load("UserInfo.xml");
- BOOL bFind = true;
- xml.ResetMainPos();
- while (xml.FindChildElem("UserID");)
- {
- //此时接点还是父接点
- CString strTagName = _T("");
- CString strData = _T("");
- strTagName = xml.GetChildTagName();
- strData = xml.GetChildData();
- TRACE("\n---tagName:%s,Data:%s--\n",strTagName,strData);
- }
- /********************这样也可以******************
- CMarkup xml;
- xml.Load("UserInfo.xml");
- BOOL bFind = true;
- xml.ResetMainPos();
- while (xml.FindChildElem("UserID");)
- {
- xml.IntoElem();
- CString strTagName = _T("");
- CString strData = _T("");
- strTagName = xml.GetTagName();
- strData = xml.GetData();
- TRACE("\n---tagName:%s,Data:%s--\n",strTagName,strData);
- xml.OutOfElem();
- }*/
- /**************这样也可以**********************
- CMarkup xml;
- xml.Load("UserInfo.xml");
- BOOL bFind = true;
- xml.ResetMainPos();
- xml.FindElem(); //UserInfo
- xml.IntoElem();
- while (xml.FindElem("UserID");)
- {
- CString strTagName = _T("");
- CString strData = _T("");
- strTagName = xml.GetTagName();
- strData = xml.GetData();
- TRACE("\n---tagName:%s,Data:%s--\n",strTagName,strData);
- }
- */
- //-------------结果----------
- ---tagName:UserID,Data:luo--
- ---tagName:UserID,Data:lin—
3. 修改
- //--------把UserID为”luo”改为”flypigluo”-----------
- BOOL bLoadXml = false;
- CMarkup xml;
- bLoadXml = xml.Load("UserInfo.xml");
- if (bLoadXml)
- {
- CString strUserID = _T("");
- xml.ResetMainPos();
- xml.FindElem();
- xml.IntoElem();
- while (xml.FindElem("UserID"))
- {
- strUserID = xml.GetData();
- if (strUserID=="luo")
- {
- xml.SetData(CString("flypig")+strUserID);
- xml.Save("UserInfo.xml");
- break;
- }
- }
- }
4. 添加
4.1 添在最后面(使用的是AddElem)
- //加在最后面
- BOOL bLoadXml = false;
- CMarkup xml;
- bLoadXml = xml.Load("UserInfo.xml");
- if (bLoadXml)
- {
- xml.ResetMainPos();
- xml.FindElem();
- xml.IntoElem();
- xml.AddElem("UserID","luoluo");
- xml.OutOfElem();
- xml.Save("UserInfo.xml");
- }
- //--------原来为------
- <?xml version="1.0" encoding="UTF-8" ?>
- <UserInfo>
- <UserID>luo</UserID>
- <UserID>lin</UserID>
- </UserInfo>
- //---------添加后为-------------
- <?xml version="1.0" encoding="UTF-8" ?>
- <UserInfo>
- <UserID>luo</UserID>
- <UserID>lin</UserID>
- <UserID>luoluo</UserID>
- </UserInfo>
4.2 加在最前面(使用InsertElem)
- BOOL bLoadXml = false;
- CMarkup xml;
- bLoadXml = xml.Load("UserInfo.xml");
- if (bLoadXml)
- {
- xml.ResetMainPos();
- xml.FindElem();
- xml.IntoElem();
- xml.InsertElem("UserID","AddUserIDHead");
- xml.OutOfElem();
- xml.Save("UserInfo.xml");
- }
- //----原来为—
- <?xml version="1.0" encoding="UTF-8" ?>
- <UserInfo>
- <UserID>luo</UserID>
- <UserID>lin</UserID>
- </UserInfo>
- //------修改后-----
- <?xml version="1.0" encoding="UTF-8" ?>
- <UserInfo>
- <UserID>AddUserIDHead</UserID>
- <UserID>luo</UserID>
- <UserID>lin</UserID>
- </UserInfo>
5. 删除
- CMarkup xml;
- xml.Load("UserInfo.xml");
- BOOL bFind = true;
- xml.ResetMainPos();
- while (bFind)
- {
- bFind = xml.FindChildElem("UserID");
- if (bFind)
- {
- //此时接点还是父接点
- CString strData = _T("");
- strData = xml.GetChildData();
- if (strData=="luo")
- {
- xml.RemoveChildElem();
- xml.Save("UserInfo.xml");
- break;
- }
- }
- }
6. 查找
见第二点浏览。类似上面的例子里面没有属性这些东西,下面的一个例子是有属性的
- //UserInfo1.xml
- <?xml version="1.0" encoding="UTF-8" ?>
- <UserInfo>
- <User UserID="UserID00" UserPwd="UserPwd00" UserLevel="158" />
- <User UserID="UserID01" UserPwd="UserPwd01" UserLevel="162" />
- <User UserID="UserID02" UserPwd="UserPwd02" UserLevel="165" />
- <User UserID="UserID03" UserPwd="UserPwd03" UserLevel="168" />
- <User UserID="UserID04" UserPwd="UserPwd04" UserLevel="171" />
- <User UserID="UserID05" UserPwd="UserPwd05" UserLevel="175" />
- <User UserID="UserID06" UserPwd="UserPwd06" UserLevel="178" />
- <User UserID="UserID07" UserPwd="UserPwd07" UserLevel="181" />
- <User UserID="UserID08" UserPwd="UserPwd08" UserLevel="184" />
- <User UserID="UserID09" UserPwd="UserPwd09" UserLevel="188" />
- </UserInfo>
7. 产生
- CString strID = _T("");
- CString strPwd = _T("");
- CMarkup xml;
- xml.SetDoc("<?xml version=\"1.0\" encoding=\"UTF-8\"?>");
- xml.AddElem("UserInfo");
- xml.IntoElem();
- for (int i=0; i<10; i++)
- {
- //产生一个随机数,作为权限
- srand(UINT(time(NULL)+i));
- int nLevel = rand()%256;
- strID.Format("UserID%02d",i);
- strPwd.Format("UserPwd%02d",i);
- xml.AddElem("User");
- xml.AddAttrib("UserID",strID);
- xml.AddAttrib("UserPwd",strPwd);
- xml.AddAttrib("UserLevel",nLevel);
- }
- xml.OutOfElem();
- xml.Save("UserInfo1.xml");
8. 查找
- CMarkup xml;
- BOOL bLoad = false;
- BOOL bFind = false;
- bLoad = xml.Load("UserInfo1.xml");
- if (bLoad)
- {
- CString strID;
- CString strPwd;
- xml.ResetMainPos();
- xml.FindElem(); //UserInfo
- while (xml.FindChildElem("User"))
- {
- strID = xml.GetChildAttrib("UserID");
- strPwd = xml.GetChildAttrib("UserPwd");
- TRACE("\n----id:%s,pwd:%s-------\n",strID,strPwd);
- if (strID=="UserID00"&&strPwd=="UserPwd00")
- {
- bFind = true;
- break;
- }
- }
- }
- if (bFind)
- {
- TRACE("\n---- find------\n");
- }
- else
- {
- TRACE("\n----no find------\n");
- }
9. 修改
- CMarkup xml;
- BOOL bLoad = false;
- BOOL bFind = false;
- bLoad = xml.Load("UserInfo1.xml");
- if (bLoad)
- {
- CString strID;
- CString strPwd;
- xml.ResetMainPos();
- xml.FindElem(); //UserInfo
- while (xml.FindChildElem("User"))
- {
- strID = xml.GetChildAttrib("UserID");
- strPwd = xml.GetChildAttrib("UserPwd");
- TRACE("\n----id:%s,pwd:%s-------\n",strID,strPwd);
- if (strID=="UserID00"&&strPwd=="UserPwd00")
- {
- bFind = true;
- xml.SetChildAttrib("UserID",strID+CString("Modify"));
- xml.Save("UserInfo1.xml");
- break;
- }
- }
- }
- if (bFind)
- {
- TRACE("\n---- find------\n");
- }
- else
- {
- TRACE("\n----no find------\n");
- }
<?xml version="1.0"?>
<BitComet Author="RnySmile" Version="0.1">
<Settings>
<LastSaveLocation>E:\电子书</LastSaveLocation>
<ListenPort>8497</ListenPort>
<GlobalMaxUploadRate>3072</GlobalMaxUploadRate>
<LastAdCacheClearDate>13104</LastAdCacheClearDate>
<LastTrackerKey>16547</LastTrackerKey>
<TotalUpload>303008</TotalUpload>
<TotalDownload>1180107</TotalDownload>
<LastExitTime>1132203124</LastExitTime>
</Settings>
</BitComet>
代码如下:
VC使用MSXML解析XML文档
第一部分:DOM解析:
概述:DOM解析将会把一个完整的XML文档读进来,生成一个结构树。这样会要把XML文档全部都加载到内在中。所以解析起来的速度会要慢一些。
1、如何加载xml文件:
//创建DOM,加载XML文档
MSXML::IXMLDOMDocumentPtr pCommandDoc;
pCommandDoc.CreateInstance(__uuidof(MSXML::DOMDocument));
pCommandDoc->put_async(VARIANT_FALSE);
pCommandDoc->put_validateOnParse(VARIANT_FALSE);
pCommandDoc->put_resolveExternals(VARIANT_FALSE);
pCommandDoc->put_preserveWhiteSpace(VARIANT_TRUE);
pCommandDoc->load(file.GetBuffer(0));
2、在XML文档中查找指定的结点:
//找到
MSXML::IXMLDOMNodePtr pRootNode=pCommandDoc->selectSingleNode("root/record");
if (pRootNode==NULL)
{
return ;
}
3、得到XML文档中,结点的属性
CString strTemp;
MSXML::IXMLDOMNamedNodeMapPtr pAttrs = NULL;
pRootNode->get_attributes(&pAttrs);
if (pAttrs==NULL)
{
return;
}
MSXML::IXMLDOMNodePtr pRequestTypeAttr=pAttrs->getQualifiedItem("name","");
_bstr_t strRequestType=pRequestTypeAttr->Gettext();
strTemp=strRequestType.operator char *();
4、得到结点的内容
_bstr_t strVisiPort=pNode->Gettext();
5、设置结点的内容
HRESULT hr=pNode->put_text(_bstr_t(m_strGatewayPassword));
6、设置一个属性内容
IXMLDOMAttribute *pa=NULL;
bstr = SysAllocString(L"属性1");
pXMLDom->createAttribute(bstr,&pNode);
var = VariantString(L"strin");
pa->put_value(var);
pRoot->setAttributeNode(pa, &pa1);
第二部分、如何使用SAX解析
概述:SAX使用的是加载式的,将会把XML文档分断,加载到内存中。使用事件通知的方式,来表示找到结点。好像没有写文档的能力吧。它的速度要比DOM快不少。
使用SAX的时候,就需要重载MSXML4.0中的一个接口ISAXContentHandler。
有几个函数重载了之后,当找到了结点之后,就会回调这一些函数。
对于这一种SAX解析的模式有一些不太了解如何应用。只是感觉这种方式可能不太好用于那种
对结构很重要的xml文档的解析。