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> 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>
原文链接：https://www.f2er.com/xml/293595.html
