vc实现xml的操作

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最近，由于工作需要程序生成 XML 的索引记录文件，特将 VC++ 读写 XML 文件的方法总结如下（参考自： http://blog.csdn.net/firebird321/archive/2008/03/17/2190847.aspx) ：

首先：建立一个基于 Dialog 的 MFC 工程，工程名为 OperateXML ，然后在对话框上添加两个按钮 ("Create" 和 "GetData" 和一个 ListControl
控件 ( 用来显示数据 ) ，首先要导入库文件
#import "msxml3.dll"
using namespace MSXML2;
主要用来实现 XML 文件的相关操作，
双击 "Create" 按钮进入代码编写，代码如下：
void COperateXML::OnBtnCreate()
{
// TODO: Add your control notification handler code here
::CoInitialize(NULL); // 初始化 COM
MSXML2::IXMLDOMDocumentPtr pDoc;
MSXML2::IXMLDOMElementPtr xmlRoot;
HRESULT hr = pDoc.CreateInstance(__uuidof(MSXML2::DOMDocument30));
if(!SUCCEEDED(hr))
{
MessageBox("Error");
return;
}
pDoc->raw_createElement((_bstr_t)(char*)"china", &xmlRoot);
pDoc->raw_appendChild(xmlRoot, NULL);

MSXML2::IXMLDOMElementPtr childNode;
pDoc->raw_createElement((_bstr_t)(char*)"city", &childNode);
childNode->Puttext("shanghai");
childNode->setAttribute("population", "7000");
childNode->setAttribute("area", "2000");
xmlRoot->appendChild(childNode);

pDoc->raw_createElement((_bstr_t)(char*)"city", &childNode);
childNode->Puttext("beijing");
childNode->setAttribute("population", "39999");
childNode->setAttribute("area", "3322");
xmlRoot->appendChild(childNode);

pDoc->save("D://test.xml");
}

双击 "GetData" 按钮进入代码编写，代码如下：
void COperateXML::OnBtnGet()
{
// TODO: Add your control notification handler code here
m_list.DeleteAllItems();
MSXML2::IXMLDOMDocumentPtr pDoc;
HRESULT hr = pDoc.CreateInstance(__uuidof(MSXML2::DOMDocument30));
if(!SUCCEEDED(hr))
{
MessageBox("Error!");
return;
}
pDoc->load("D://test.xml");
MSXML2::IXMLDOMElementPtr childNode;
childNode = (MSXML2::IXMLDOMElementPtr)(pDoc->selectSingleNode("//city"));

MSXML2::DOMNodeType nodeType;
childNode->get_nodeType(&nodeType);

MSXML2::IXMLDOMNamedNodeMapPtr pAttrs = NULL;
MSXML2::IXMLDOMNodeListPtr nodeList;
MSXML2::IXMLDOMNodePtr pAttrItem;
childNode->get_attributes(&pAttrs);
childNode->get_childNodes(&nodeList);
long nCount, iCount;
pAttrs->get_length(&nCount); // 获取节点属性个数
nodeList->get_length(&iCount); // 获取节点个数
for(int i = 0; i < iCount; i++) // 根据需要可以添加数据到 ListControl 中
{
   for(int j = 0; j < nCount; j++)
   {
    pAttrs->get_item(j, &pAttrItem);
    CString strAttrName = (char*)(_bstr_t)pAttrItem->nodeName;
    CString strAttr = (char*)(_bstr_t)pAttrItem->nodeType;
    m_list.InsertItem(i, strAttrName);
    m_list.SetItemText(i, 1, strAttr);
   }
}

}

为 ListControl 控件绑定一个操作变量

CListCtrl m_list;

在 OnInitDialog 中初始化，代码如下：

BOOL COperateXML::OnInitDialog()
{
// TODO: Add extra initialization here
m_list.InsertColumn(0, " 人口 ");
m_list.InsertColumn(1, "Num");
m_list.InsertColumn(1, " 面积 ");
m_list.InsertColumn(1, "Num");
CRect rect;
m_list.GetClientRect(&rect);
int width = (rect.right - rect.left) / 4;
m_list.SetColumnWidth(0, width);
m_list.SetColumnWidth(1, width);
m_list.SetColumnWidth(2, width);
m_list.SetColumnWidth(3, width);
}

F7 编译程序， Ctrl ＋ F5 查看显示结果，至此一个简单的操作 XML 文件的实现已经成功的完成了。

程序代码

#import "msxml6.dll" named_guids raw_interfaces_only
#include <msxml.h>
using namespace MSXML2;
using namespace std;
int testXml(wstring strfilname)
{
cout << "BEGIN" << endl;
HRESULT hr;
long cnt;
try
{
MSXML2::IXMLDOMDocumentPtr pDoc;
MSXML2::IXMLDOMNodeListPtr pNodeList;
MSXML2::IXMLDOMNodePtr pNode, pRoot;
MSXML2::IXMLDOMNamedNodeMapPtr pAttr;
hr = ::CoInitialize(NULL);
if (FAILED(hr))
{
throw L"failed to com init";
}
hr = CoCreateInstance(CLSID_DOMDocument60, NULL, CLSCTX_INPROC_SERVER,
MSXML2::IID_IXMLDOMDocument, (void**)&pDoc);
if(FAILED(hr))
throw "failed to create DOM DOC";
VARIANT_BOOL bIsSuccessful;
BSTR bstr1 = SysAllocString(L"d://b.xml");
VARIANT v1;
v1.vt = VT_BSTR;
v1.bstrVal = bstr1;
///// 载入 xml 文件
pDoc->load(v1, &bIsSuccessful);
SysFreeString(bstr1);
///// 获取根节点 ROOT_BASENAME
//pRoot = pDoc->firstChild;
pDoc->get_firstChild(&pRoot);
///// 输出跟节点名字
BSTR bstr;
pRoot->get_nodeName(&bstr);
cout << (char*)((_bstr_t)bstr) <<endl;
///// 获取根节点属性 Attr_baseName_1 = "Attr_text_1" Attr_baseName_2 = "Attr_text_2"
pRoot->get_attributes(&pAttr);
///// 取得属性个数
long length;
pAttr->get_length(&length);
cout << length << endl;
///// 输出根节点属性
for(cnt = 0 ; pAttr->nextNode(&pNode), pNode ; ++cnt)
{
BSTR baseName;
pNode->get_baseName(&baseName);
BSTR text;
pNode->get_text(&text);
cout << (char*)((_bstr_t)baseName) << " " << (char*)((_bstr_t)text) << endl;
}
cout << "Attr count " << cnt <<endl;
///// 输出根节点所有儿子
pRoot->get_childNodes(&pNodeList);
pNodeList->get_length(&cnt);
cout << "LENGTH " << cnt << endl;
for(cnt = 0; pNodeList->nextNode(&pNode), pNode; ++cnt)
{
BSTR text;
pNode->get_text(&text);
cout << (char*)((_bstr_t)text) << endl;
}
cout << "Node count " << cnt <<endl;
}
catch (string str)
{
cout << "Exception : " << str << endl;
}
catch (...)
{
cout << "Exception Unkonwn/n";
}
::CoUninitialize();
cout << "END" <<endl;
return 0;
}

xml 文件：

<ROOT_BASENAME Attr_baseName_1 = "Attr_text_1" Attr_baseName_2 = "Attr_text_2">
<FIRST_CHILD>
text_1
</FIRST_CHILD>
<CHILD>
text_2
</CHILD>
<LAST_CHILD>
text_3

</LAST_CHILD>