Qt之读（解析）XML文件

先上代码

//从config.xml中获取标签appenvironment和oa_app_version的值
//appenvironment值为pro表示生产，为pre表示预生产
QMap<QString, QString> readXml()
{
QMap<QString, QString> mapList;
mapList.clear();
QString configXMLPath = QCoreApplication::applicationDirPath()+"\\config\\config.xml";
QFile file(configXMLPath);
if (file.open(QIODevice::ReadOnly | QIODevice::Text))
{
QXmlStreamReader reader(&file);
while (!reader.atEnd() && !reader.hasError())
{
QXmlStreamReader::TokenType token = reader.readNext();

if (token == QXmlStreamReader::StartElement)
{
if (reader.name() == "appenvironment" || reader.name() == "oa_app_version")
{
QXmlStreamAttributes attributes = reader.attributes();
if (attributes.hasAttribute("value"))
{
QString strValue = attributes.value("value").toString();
mapList.insert(reader.name().toString(), strValue);
}
}
}
}
//解析出错
if (reader.hasError())
{
QString errorInfo = QStringLiteral("XML解析错误：%1  行号：%2  列号：%3  字符位移：%4").
arg(reader.errorString()).arg(reader.lineNumber()).arg(reader.columnNumber()).arg(reader.characterOffset());
qDebug() << errorInfo;
}

file.close();
reader.clear();
}
return mapList;
}

这样写，如果是QApplication a(argc, argv);之后调用QMap<QString, QString> readXml()是没有问题的，但是如果要在QApplication a(argc, argv);之前调用QMap<QString, QString> readXml()就会因为QCoreApplication::applicationDirPath()返回为空，导致无法正确解析XML。

此时可以调用Windows API，如下所示。

//从config.xml中获取标签appenvironment和oa_app_version的值
//appenvironment值为pro表示生产，为pre表示预生产
QMap<QString, QString> readXml()
{
QMap<QString, QString> mapList;
mapList.clear();
TCHAR szPath[MAX_PATH] = { 0 };
GetModuleFileName(NULL, szPath, MAX_PATH);
(_tcsrchr(szPath, _T('\\')))[1] = 0;
QString configXMLPath= QString::fromUtf16((const ushort *)szPath)+"config\\config.xml";
QFile file(configXMLPath);
if (file.open(QIODevice::ReadOnly | QIODevice::Text))
{
QXmlStreamReader reader(&file);
while (!reader.atEnd() && !reader.hasError())
{
QXmlStreamReader::TokenType token = reader.readNext();

if (token == QXmlStreamReader::StartElement)
{
if (reader.name() == "appenvironment" || reader.name() == "oa_app_version")
{
QXmlStreamAttributes attributes = reader.attributes();
if (attributes.hasAttribute("value"))
{
QString strValue = attributes.value("value").toString();
mapList.insert(reader.name().toString(), strValue);
}
}
}
}
//解析出错
if (reader.hasError())
{
QString errorInfo = QStringLiteral("XML解析错误：%1  行号：%2  列号：%3  字符位移：%4").
arg(reader.errorString()).arg(reader.lineNumber()).arg(reader.columnNumber()).arg(reader.characterOffset());
qDebug() << errorInfo;
}

file.close();
reader.clear();
}
return mapList;
}

XML格式如下。

<?xml version="1.0" encoding="UTF-8"?>
<client>
<app>
<Appname value="cangege"/>
</app>
<server>
<sdkip value="********" />
<sdkport value="********" />
<appid value="********" />
<client_id value="********" />
<oa_os_id value="********" />
<oa_app_version value="1.0.0" />
<appenvironment value="pre" /> <!-- pre(预生产) pro (生产)-->
</server>
<loginuser>
<users id="********"/>
</loginuser>
</client>