CLASS QDir
function:mkpath

CLASS QDir
to show the absolutefilepath

File Operating
write and read

Screenshots can do everything but paste codes

#include <QCoreApplication>#include <QtDebug>#include <QString>#include <QFile>#include <QTextStream>
void Write(QString filename){ QFile file(filename);
if(!file.open(QFile::WriteOnly | QFile::Text)) { qDebug() << "open error"; return; } QTextStream out(&file); out << "hello world";
file.flush(); file.close();}
void Read(QString filename){ QFile file(filename);
if(!file.open(QFile::ReadOnly | QFile::Text)) { qDebug() << "read error"; return; } QTextStream in(&file); QString mtext = in.readAll(); qDebug() << mtext;
file.close();}
int main(int argc, char *argv[]){ QCoreApplication a(argc, argv); QString filename = "F:/QT/123.txt";
Write(filename); Read(filename);
return a.exec();}

Mother Du can paste everything but a carrige return!

Video21 QTreeWidget
how to build a QTreeWidget

Containers
QList
QListIterator

QMutableListIterator<T> allows you to iterate over a QList<T> (or a QQueue<T>) and modify the list. If you don*t want to modify the list (or have a const QList), use the slightly faster QListIterator<T> instead.

QList<T>, QLinkedList<T>, and QVector<T> provide similar functionality. Here*s an overview:
For most purposes, QList is the right class to use. Its index-based API is more convenient than QLinkedList*s iterator-based API, and it is usually faster than QVector because of the way it stores its items in memory (see Algorithmic Complexity for details). It also expands to less code in your executable.
If you need a real linked list, with guarantees of constant time insertions in the middle of the list and iterators to items rather than indexes, use QLinkedList.
If you want the items to occupy adjacent memory positions, use QVector.

QT tablewidget
http://blog.sina.com.cn/s/blog_6f95aee601013zlg.html

x

这都是啥。。。实验室师兄也很推荐Qt，说编界面比C要好呢