在C ++中读取写入XML文件 [英] Read Write XML File In C++

问题描述

我研究了很多关于如何在C ++中读写（更新）一个简单的.xml文件，但我不能为它开发代码。

我工作和安装xerces-c库，我认为是需要使用DOM或SAX2解析器来读它。

请有人可以帮助编写代码。 / p>

这样做的示例代码将非常有用。

最好的问候，
Adarsh Sharma

解决方案

我推荐MSXML。它可能看起来很复杂，但是当它习惯了它是很好，很容易。

这里是一个示例：

input.xml：

 <？xml version =1.0encoding =UTF-8？& 
< Car> 
< Wheels> 
< Wheel1> FL< / Wheel1> 
< Wheel2> FR< / Wheel2> 
< Wheel3> RL< / Wheel3> 
< Wheel4> RR< / Wheel4> 
< / Wheels> 
< / Car> 
  

代码：

  #include< stdio.h> 
 #include< tchar.h> 
 #include< windows.h> 
 #import< msxml6.dll> rename_namespace（_T（MSXML））
 
 int main（int argc，char * argv []）
 {
 HRESULT hr = CoInitialize 
 if（SUCCEEDED（hr））
 {
 try 
 {
 MSXML :: IXMLDOMDocument2Ptr xmlDoc; 
 hr = xmlDoc.CreateInstance（__ uuidof（MSXML :: DOMDocument60），NULL，CLSCTX_INPROC_SERVER）; 
 // TODO：if（FAILED（hr））... 
 
 if（xmlDoc-> load（_T（input.xml））！= VARIANT_TRUE）
 {
 printf（无法加载input.xml\\\
）; 
} 
 else 
 {
 printf（XML has successfully loaded\\\
）; 
 
 xmlDoc-> setProperty（SelectionLanguage，XPath）; 
 MSXML :: IXMLDOMNodeListPtr wheels = xmlDoc-> selectNodes（/ Car / Wheels / *）; 
 printf（Car has％u wheels \\\
，wheels-> Getlength（））; 
 
 MSXML :: IXMLDOMNodePtr节点; 
 node = xmlDoc-> createNode（MSXML :: NODE_ELEMENT，_T（Engine），_T（））; 
 node-> text = _T（Engine 1.0）; 
 xmlDoc-> documentElement-> appendChild（node）; 
 hr = xmlDoc-> save（_T（output.xml））; 
 if（SUCCEEDED（hr））
 printf（output.xml successfully saved\\\
）; 
} 
} 
 catch（_com_error& e）
 {
 printf（ERROR：％ws\\\
，e.ErrorMessage（））; 
} 
 CoUninitialize（）; 
} 
 return 0; 
} 
  

输出：
XML已成功载入
4轮
output.xml已成功保存

output.xml：

 <？xml version =1.0encoding =UTF-8？> 
< Car> 
< Wheels> 
< WheelLF> 1< / WheelLF> 
< WheelRF> 2< / WheelRF> 
< WheelLR> 3< / WheelLR> 
< WheelRR> 4< / WheelRR> 
< / Wheels> 
< Engine> Engine 1.0< / Engine>< / Car> 
  

您可以在这里找到所需的一切：

http://msdn.microsoft.com/en-us/library/ms765540（v = vs.85 ）.aspx

希望有人认为这很有用）;

I researched a lot on how to read and write ( update ) a simple .xml file in C++ but i am not able to develop the code for it.

I work and installed xerces-c library that I think is needed to use DOM or SAX2 parser to read it.

Please someone can help to write the code for it.

A sample code to do this will be quite helpful.

Thanks & best Regards, Adarsh Sharma

解决方案

I recommend MSXML. It may look complicated, but it's nice and easy when you get used to it.
Here's a sample:

input.xml:

<?xml version="1.0" encoding="UTF-8"?>
<Car>
    <Wheels>
        <Wheel1>FL</Wheel1>
        <Wheel2>FR</Wheel2>
        <Wheel3>RL</Wheel3>
        <Wheel4>RR</Wheel4>
    </Wheels>
</Car>

code:

#include <stdio.h>
#include <tchar.h>
#include <windows.h>
#import <msxml6.dll> rename_namespace(_T("MSXML"))

int main(int argc, char* argv[])
{
    HRESULT hr = CoInitialize(NULL); 
    if (SUCCEEDED(hr))
    {
        try
        {
            MSXML::IXMLDOMDocument2Ptr xmlDoc;
            hr = xmlDoc.CreateInstance(__uuidof(MSXML::DOMDocument60), NULL, CLSCTX_INPROC_SERVER);
            // TODO: if (FAILED(hr))...

            if (xmlDoc->load(_T("input.xml")) != VARIANT_TRUE)
            {
                printf("Unable to load input.xml\n");
            }
            else
            {
                printf("XML was successfully loaded\n");

                xmlDoc->setProperty("SelectionLanguage", "XPath");
                MSXML::IXMLDOMNodeListPtr wheels = xmlDoc->selectNodes("/Car/Wheels/*");
                printf("Car has %u wheels\n", wheels->Getlength());

                MSXML::IXMLDOMNodePtr node;
                node = xmlDoc->createNode(MSXML::NODE_ELEMENT, _T("Engine"), _T(""));
                node->text = _T("Engine 1.0");
                xmlDoc->documentElement->appendChild(node);
                hr = xmlDoc->save(_T("output.xml"));
                if (SUCCEEDED(hr))
                    printf("output.xml successfully saved\n");
            }
        }
        catch (_com_error &e)
        {
            printf("ERROR: %ws\n", e.ErrorMessage());
        }
        CoUninitialize();
    }
    return 0;
}

output: XML was successfully loaded Car has 4 wheels output.xml successfully saved

output.xml:

<?xml version="1.0" encoding="UTF-8"?>
<Car>
    <Wheels>
        <WheelLF>1</WheelLF>
        <WheelRF>2</WheelRF>
        <WheelLR>3</WheelLR>
        <WheelRR>4</WheelRR>
    </Wheels>
    <Engine>Engine 1.0</Engine></Car>

You will find everything you need here:
http://msdn.microsoft.com/en-us/library/ms765540(v=vs.85).aspx

Hope someone finds this useful ;)

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