source file : config_proc.cpp / config_proc.h
step1. includ the head file : #include <config_proc.h>. Add xml lib to your project at *.pro like this : QT += xml
step2. new a class in MainWindow class : ConfigProc *config_ = new ConfigProc(this);
step3. select a dir as working dir : config_->LoadDir(directoryName); class will load each xml file into menmory (DOM XML).
step4. query or set specified xml tag. Don't forget to save file. Using interface below:
public:
bool LoadDir(const QString dir);
bool FindElement(const QString &file, const QString &path, QDomElement &target_element);
QString QueryElement(const QString &file, const QString &path, const QString attr = "value");
bool SetElement(const QString &file, const QString &path, const QString value = "", const QString attr = "value");
bool RemoveElement(const QString &file, const QString &path);
bool RemoveElementAttr(const QString &file, const QString &path, const QString attr = "value");
bool AddElement(const QString &file, const QString &path, const QString &name);
bool SaveXML(const QString &file);

the file will read and write in "GB2312", if you wanna change it. modify [ static const char encode[] = "GB2312"; ] in config_proc.h
there is a demo shown in mainwindow.cpp/mainwindow.h
you can even run it.

QT pack
windows:
install Qt Creator->Generate exe executable file -> copy exe file to another dir -> windeployqt package dynamic library needed, -> using enigma_Virtual_Box pack to one exe
linux:
install Qt Creator->Generate exe executable file -> copy exe file to another dir -> linuxdeployqt package dynamic library needed, -> pack dep/rpm

参见 bolg