C++中DOM写XML

C++中DOM写XML

用MSXML 4.0：
1)用一般的指针
2)用智能指针，比较简单

下面的例子用智能指针：
 步骤：
        

Programmatically, the dynamDOMsmart application performs the following steps:

1. Creates an XML DOM instance (pXMLDom).
2. Calls the createProcessInstruction method on pXMLDom. This creates a processing instruction node (pi) targeted for XML 1.0.
3. Calls the appendChild method on pXMLDom. This adds the processing instruction node (pi) to pXMLDom.
4. Calls the createComment method on the DOM object (pXMLDom) to create a comment node (pc) and then append it pXMLDom.
5. Creates a <root> element as the document element, with a created attribute whose value is set to a string value of "using DOM". Adds this element (<root>) to the DOM object (pXMLDom).
6. Creates a <node1> element with some character data as its content. Appends this element (pe) to the document element (documentElement) of the DOM object (pXMLDom).
7. Creates a <node2> element that contains a CDATA section (pcd) with markup text. Appends this element (pe) to the document element (documentElement) of the DOM object (pXMLDom).
8. Creates a <node3> element that contains a DOM document fragment (pdf). This fragment contains three other empty child elements: <subNode1>, <subNode2>, and <subNode3>. The code then appends this element (pe) to the document element (documentElement) of the DOM object (pXMLDom).
9. Saves this dynamically created DOM object to the project's main directory, and prints the XML data in the application console.

源代码：

#include  < stdio.h >
#import  < msxml4.dll >
using   namespace  MSXML2;
int  main( int  argc,  char *  argv[])
{
IXMLDOMDocument3Ptr pXMLDom;
HRESULT hr;
CoInitialize(NULL);
hr = pXMLDom.CreateInstance(__uuidof(DOMDocument40));
if (FAILED(hr))
{
printf("Failed to CreateInstance on an XML DOM");
return NULL;
}
pXMLDom->preserveWhiteSpace = VARIANT_TRUE;
// Create a processing instruction targeted for xml.
IXMLDOMProcessingInstructionPtr pi;
pi = pXMLDom->createProcessingInstruction("xml", "version='1.0'");
if (pi != NULL) {
pXMLDom->appendChild(pi);
pi.Release();
}
// Create a processing instruction targeted for xml-stylesheet.
pi = pXMLDom->createProcessingInstruction("xml-stylesheet",
"type='text/xml' href='dom.xsl'");
if (pi != NULL) {
pXMLDom->appendChild(pi);
pi.Release();
}
// Create a comment for the document.
IXMLDOMCommentPtr pc;
pc = pXMLDom->createComment("sample xml file created using XML DOM object.");
if (pc != NULL) {
pXMLDom->appendChild(pc);
pc.Release();
}
// Create the root element (i.e., the documentElement).
IXMLDOMElementPtr pe;
pe = pXMLDom->createElement("root");
// Create a "created" attribute for the root element and
// assign the "using dom" character data as the attribute value.
IXMLDOMAttributePtr pa;
pa = pXMLDom->createAttribute("created");
if (pa != NULL)
{
pa->value = "using dom";
pe->setAttributeNode(pa);
pa.Release();
}
// Add the root element to the DOM instance.
pXMLDom->appendChild(pe);
pe.Release();
// Next, we will create and add more nodes to the root element
// we've just created.
// Create an element to hold text content.
pe = pXMLDom->createElement("node1");
if (pe != NULL)
{
// Add newline + tab for indentation.
pXMLDom->documentElement->appendChild(pXMLDom->createTextNode("\n\t"));
pe->text = "some character data";
pXMLDom->documentElement->appendChild(pe);
pe.Release();
}
// Create an element to hold a CDATA section.
pe=pXMLDom->createElement("node2");
if (pe != NULL)
{
// Add newline + tab for indentation.
pXMLDom->documentElement->appendChild(pXMLDom->createTextNode("\n\t"));
IXMLDOMCDATASectionPtr pcd;
pcd = pXMLDom->createCDATASection("<some mark-up text>");
if (pcd != NULL) {
pe->appendChild(pcd);
pcd.Release();
}
pXMLDom->documentElement->appendChild(pe);
pe.Release();
}
// Create an element to hold three empty subelements.
pe=pXMLDom->createElement("node3");
if (pe != NULL)
{
// Add newline +tab for indentation.
pXMLDom->documentElement->appendChild(pXMLDom->createTextNode("\n\t"));
IXMLDOMDocumentFragmentPtr pdf;
pdf = pXMLDom->createDocumentFragment();
pdf->appendChild(pXMLDom->createTextNode("\n\t\t"));
pdf->appendChild(pXMLDom->createElement("subNode1"));
pdf->appendChild(pXMLDom->createTextNode("\n\t\t"));
pdf->appendChild(pXMLDom->createElement("subNode2"));
pdf->appendChild(pXMLDom->createTextNode("\n\t\t"));
pdf->appendChild(pXMLDom->createElement("subNode3"));
pdf->appendChild(pXMLDom->createTextNode("\n\t"));
pe->appendChild(pdf);
pdf.Release();
pXMLDom->documentElement->appendChild(pe);
pe.Release();
pXMLDom->documentElement->appendChild(pXMLDom->createTextNode("\n"));
}
printf("Dynamically created DOM:\n%s\n",
(LPCSTR)pXMLDom->xml);
hr = pXMLDom->save("dynaDom.xml");
if (FAILED(hr))
{
printf("Failed to save DOM to dynaDom.xml\n");
}
else
{
printf("DOM saved to dynamDom.xml\n");
}
if (pXMLDom) pXMLDom.Release();
CoUninitialize();
return 0;
}

结果：

Dynamically created DOM:
<?xml version="1.0"?>
<?xml-stylesheet type='text/xml' href='dom.xsl'?>
<!--sample xml file created using XML DOM object.-->
<root created="using dom">
<node1>some character data</node1>
<node2><![CDATA[<some mark-up text>]]></node2>
<node3>
<subNode1/>
<subNode2/>
<subNode3/>
</node3>
</root>
DOM saved to dynamDom.xml

－－－－－－－－－－－－－－－－－－－－－－－－－－－－－
在此过程中，经常会有一些错误：保存文件的路径，有的时候我写绝对路径，但是结果它却还是保存到相对路径，（为什么那？）还有里面的字符格式的转化，比较复杂，哈哈！欢迎大家来讨论：

哪位高手知道，关于保存路径的具体的东西啊，反正我发现相对路径有的时候并不总是相对你的原程序，当你打开文件处理在保存时，相对路径是相对你程序打开的文件的路径！



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