XML实例入门1

虽然网上会有XML入门或者多少天教会XML，一般都是从普通的功能概念开始啰嗦，个人还是比较喜欢从实例开始，遇到不懂直接查（不过这次选了一个比较难得例子，研究了好久^_^）。刚开始看了一个vc6.0XML的例子，调通了，不过要用VS2008开发，想移植到VS2008，挺麻烦的，就没咋看，有需要可以下载看看。

　　工具：notepad++、VS2008(MSXML6.0)

来自msdn的例子（经过修改，因为升级到MSXML6.0，有些关键字不太一样了），

需要文件books.xml，books.vsd（博客只支持xml文件，vsd修改后缀就可以）

#include <stdio.h>
#import <msxml6.dll>
using namespace MSXML2;

int main(int argc, char* argv[])
{
    HRESULT hr;

    CoInitialize(NULL);

    IXMLDOMDocument3Ptr pXMLDoc;
    IXMLDOMDocument3Ptr pXSDDoc;
        IXMLDOMSchemaCollectionPtr pSCache;
    IXMLDOMParseError2Ptr pEitem;
    IXMLDOMParseError2Ptr pError;

        hr = pXMLDoc.CreateInstance(__uuidof(DOMDocument60));
        if(FAILED(hr)){
            printf("Failed to CreateInstance on an XML DOM");
            return -;
        }

        pXMLDoc->async = VARIANT_FALSE;
        pXMLDoc->validateOnParse = VARIANT_FALSE;
        hr = pXMLDoc->setProperty("MultipleErrorMessages", VARIANT_TRUE);
        if(FAILED(hr)){
            printf("Failed to enable multiple validation errors\n");
            return -;
        }
        if(pXMLDoc->load("..\\books.xml")!=VARIANT_TRUE){
            printf("Failed to load Dom from books.xml. %s\n",
                (LPCSTR)pXMLDoc->parseError->reason);
            return -;
        }

        hr = pXSDDoc.CreateInstance(__uuidof(DOMDocument60));
        if(FAILED(hr)){
            printf("Failed to CreateInstance on an XSD DOC");
            return -;
        }
        pXSDDoc->async = VARIANT_FALSE;
        pXSDDoc->validateOnParse = VARIANT_FALSE;
        if(pXSDDoc->load("..\\books.xsd")!=VARIANT_TRUE){
            printf("Failed to load XSD from books.xsd. %s\n",
                (LPCSTR)pXSDDoc->parseError->reason);
            return -;
        }

        hr = pSCache.CreateInstance(__uuidof(XMLSchemaCache60));
        if(FAILED(hr)){
            printf("Cannot instantiate XMLSchemaCache60\n");
            return -;
        }
        pXMLDoc->schemas = pSCache.GetInterfacePtr();

        hr = pSCache->add("urn:books", pXSDDoc.GetInterfacePtr());
        if(FAILED(hr)){
            printf("Cannot add 'urn:books' to schema cache.\n");
            return -;
        }

        //Validate the entire DOM object.
        pError = pXMLDoc->validate();
        if(pError->errorCode != ){
            printf("Error as returned from validate():\n\n");
            printf("\tError Code: %d\n", pError->errorCode);
            printf("\tError reson: \n%s", (LPCSTR)pError->reason);
            printf("\tError location: \n%s\n", (LPCSTR)pError->errorXPath);
            printf("\tErrors count: %d\n", pError->allErrors->length);
            printf("\nError items from the allErrors collection:\n");

            for(int i=;i<pError->allErrors->length;i++){
                pEitem = pError->allErrors->item[i];
                printf("\nErrorItem[%d]:\n", i);
                printf("\treason:\n%s", (LPCSTR)pEitem->reason);
                printf("\tlocation: \n%s\n", (LPCSTR)pEitem->errorXPath);
            }
        }else{
            printf("valid dom as follows:\n%s\n",
                (LPCSTR)pXMLDoc->xml);
        }

        pError.Release();
        pEitem.Release();
        pXMLDoc.Release();
        pXSDDoc.Release();
        pSCache.Release();

        CoUninitialize();
        return ;
}

注：1、pXMLDoc->load("..\\books.xml")，文件路径是工程根目录

2、例子是XSD对XML文件的validate

3、把不懂的地方查懂XML入门是没问题