Qt练习
测试按钮
mywidget.cpp
#include "mywidget.h"
#include 具有复选框的树形控件
widget.h
#ifndef WIDGET_H
#define WIDGET_H
#include widget.cpp
#include "widget.h"
#include "ui_widget.h"
Widget::Widget(QWidget *parent) :
QWidget(parent),
ui(new Ui::Widget)
{
ui->setupUi(this);
init();
connect(ui->treeWidget,SIGNAL(itemChanged(QTreeWidgetItem*,int)),this,SLOT(treeItemChanged(QTreeWidgetItem*,int)));
}
Widget::~Widget()
{
delete ui;
}
void Widget::init()
{
ui->treeWidget->clear();
QTreeWidgetItem *group1 = new QTreeWidgetItem(ui->treeWidget);
group1->setText(0,"group1");
group1->setFlags(Qt::ItemIsUserCheckable|Qt::ItemIsEnabled|Qt::ItemIsSelectable);
group1->setCheckState(0,Qt::Unchecked);
QTreeWidgetItem *subItem1 = new QTreeWidgetItem(group1);
subItem1->setText(0,"subItem1");
subItem1->setFlags(Qt::ItemIsUserCheckable|Qt::ItemIsEnabled|Qt::ItemIsSelectable);
subItem1->setCheckState(0,Qt::Unchecked);
QTreeWidgetItem *subItem2 = new QTreeWidgetItem(group1);
subItem2->setText(0,"subItem2");
subItem2->setFlags(Qt::ItemIsUserCheckable|Qt::ItemIsEnabled|Qt::ItemIsSelectable);
subItem2->setCheckState(0,Qt::Unchecked);
QTreeWidgetItem *subItem3 = new QTreeWidgetItem(group1);
subItem3->setText(0,"subItem3");
subItem3->setFlags(Qt::ItemIsUserCheckable|Qt::ItemIsEnabled|Qt::ItemIsSelectable);
subItem3->setCheckState(0,Qt::Unchecked);
}
void Widget::treeItemChanged(QTreeWidgetItem *item,int column)
{
QString itemText=item->text(0);
if(Qt::Checked == item->checkState(0))
{
QTreeWidgetItem *parent = item->parent();
int count = item->childCount();
if(count > 0)
{
for(int i=0; ichild(i)->setCheckState(0,Qt::Checked);
}
}
else
{
updateParentItem(item);
}
}
else if(Qt::Unchecked == item->checkState(0))
{
int count = item->childCount();
if(count > 0)
{
for(int i=0; ichild(i)->setCheckState(0,Qt::Unchecked);
}
}
else
{
updateParentItem(item);
}
}
}
void Widget::updateParentItem(QTreeWidgetItem *item)
{
QTreeWidgetItem *parent = item->parent();
if(parent == NULL)
return;
int selectedCount = 0;
int childcount = parent->childCount();
for(int i=0; iQTreeWidgetItem *childItem = parent->child(i);
if(childItem->checkState(0) == Qt::Checked)
selectedCount++;
}
if(selectedCount <= 0)//子列表每一个选中
{
parent->setCheckState(0,Qt::Unchecked);
}
else if(selectedCount > 0 && selectedCount < childcount)//子列表部分选中
{
parent->setCheckState(0,Qt::PartiallyChecked);
}
else//子列表都选中
{
parent->setCheckState(0,Qt::Checked);
}
} 设置一个特定输入的文本框
dialog.h
#ifndef DIALOG_H
#define DIALOG_H
#include dialog.cpp
#include "dialog.h"
#include "ui_dialog.h"
Dialog::Dialog(QWidget *parent) :
QDialog(parent),
ui(new Ui::Dialog)
{
ui->setupUi(this);
QRegExp regExp("[A-Za-z][1-9][0-9]{0,2}");
//这是一个正则表达式，输入的第一个为字母，接着为1-9的一个数字，再接着是0-2个0-9的数字
ui->lineEdit->setValidator(new QRegExpValidator(regExp,this));
//为输入框设置正则表达式
connect(ui->okButton,SIGNAL(clicked()),this,SLOT(accept()));
connect(ui->cancelButton,SIGNAL(clicked()),this,SLOT(reject()));
}
Dialog::~Dialog()
{
delete ui;
}
void Dialog::on_lineEdit_textChanged()
{
ui->okButton->setEnabled(ui->lineEdit->hasAcceptableInput());
//输入匹配时OK按钮才能用
}
分隔窗口（各个窗口的大小可以随意拖拽）
main.cpp
#include "mainwindow.h"
#include 
进度条和进度条对话框
progressdlg.h
#ifndef PROGRESSDLG_H
#define PROGRESSDLG_H
#include progressdlg.cpp
#include "progressdlg.h"
#include 
电子时钟
digiclock.h
#ifndef DIGICLOCK_H
#define DIGICLOCK_H
#include digiclock.cpp
#include "digiclock.h"
#include main.cpp
#include "clock.h"
#include 
QStackedLayout
可以用QComBox或者存有页面名字的QListWidget来让用户选择页面
mainwindow.cpp
#include "mainwindow.h"
#include QDockWidget使用
dockwindows.cpp
#include "dockwindows.h"
#include 
带标签的QDockWidget
qdockwidget3.cpp
#include "qdockwidget3.h"
#include 
参考资料：http://www.cnblogs.com/sfy5848/p/4835458.html
可扩展对话框练习
extensiondlg.h
#ifndef EXTENSIONDLG_H
#define EXTENSIONDLG_H
#include extensiondlg.cpp
#include "extensiondlg.h"
#include 
读取文件
qt控制台应用
main.cpp
#include return a.exec();
}
QTextStream类读写文件
#include "score:")<10)<90<//设置字段宽度为10
}
return a.exec();
}
读写二进制文件
mainwindow.cpp
#include "mainwindow.h"
#include "我擦"));//将字符串序列化
out<"1994/09/25","yyyy/MM/dd");
out<<(qint32)19;
file.close();
file.setFileName("binary.dat");
if(!file.open(QIODevice::ReadOnly))
{
qDebug()<<"error";
return;
}
QDataStream in(&file);
QString name;
QDate birthday;
qint32 age;
in>>name>>birthday>>age;
qDebug()<;
file.close();
}
递归读取分目录和总目录的大小
main.cpp
#include
#include
#include
#include
#include
//递归读取分目录的大小
qint64 du(const QString &path)
{
QDir dir(path);
qint64 size = 0;
//QDir::Files,List files.
foreach (QFileInfo fileinfo, dir.entryInfoList(QDir::Files)) {
size += fileinfo.size();
}
//QDir::Dirs,List directories that match the filters.
//QDir::NoDotAndDotDot,Do not list the special entries "." and "..".
foreach (QString subDir, dir.entryList(QDir::Dirs|QDir::NoDotAndDotDot)) {
size += du(path + QDir::separator() + subDir);
}
char unit = 'B';
qint64 curSize = size;
if(curSize > 1024)
{
curSize /= 1024;
unit = 'K';
if(curSize > 1024)
{
curSize /= 1024;
unit = 'M';
if(curSize > 1024)
{
curSize /= 1024;
unit = 'G';
}
}
}
//返回目录的名字及大小
qDebug()<unit<<"\t"<return size;
}
int main(int argc, char *argv[])
{
QCoreApplication a(argc, argv);
QStringList args = a.arguments();
QString path;
if(args.count() > 1)
{
path = args[1];
}
else
{
path = QDir::currentPath();
}
qDebug()<return a.exec();
} 
文件显示器
fileview.h
#ifndef FILEVIEW_H
#define FILEVIEW_H
#include fileview.cpp
#include "fileview.h"
#include 
获取文件信息
fileinfo.h
#ifndef FILEINFO_H
#define FILEINFO_H
#include fileinfo.cpp
#include "fileinfo.h"
#include 主窗体练习
ShowWidget是中心部件
showwidge.h
#ifndef SHOWWIDGET_H
#define SHOWWIDGET_H
#include showwidget.cpp
#include "showwidget.h"
#include ImgProcessor是主窗口
imgprocessor.h
#ifndef IMGPROCESSOR_H
#define IMGPROCESSOR_H
#include imgprocessor.cpp
#include "imgprocessor.h"
#include 
QTableWidget
表格类一般用到3个类，一个是QTableView可以定义的部分很多，一个是QTableWidget,一个是QTableWidgetItem（表格里面插入的内容），注意：要设置QTableWidget的行数和列数添加的Item才会显示出来
参考博客1：http://blog.csdn.net/xgbing/article/details/7774737
参考博客2：http://www.cnblogs.com/li-peng/p/3654634.html
参考博客3：http://www.cnblogs.com/findumars/p/5553367.html
mainwindow.cpp
#include "mainwindow.h"
#include <QTableWidget>
#include <QTableWidgetItem>
#include <QStringList>
#include <QHeaderView>
MainWindow::MainWindow(QWidget *parent)
: QMainWindow(parent)
{
//指定行和列
QTableWidget *table = new QTableWidget(5,3,this);
//table->resize(600,600);
QStringList header;
header << "书名" << "出版社" << "作者";
//设置列标题
table->setHorizontalHeaderLabels(header);
//从QTableView上继承下来的方法,返回的是QHeaderView,并且设置最后一列自动填充剩余空间
table->horizontalHeader()->setStretchLastSection(true);
//table如何你设置了5列，它会自动加上一列，显示行号，这个就是设置不要系统自动加的那一列
table->verticalHeader()->setVisible(false);
//从QAbstractItemView继承下来的方法,项目的修改方式
table->setEditTriggers(QAbstractItemView::DoubleClicked);
//从QAbstractItemView继承下来的方法,选中的方式
table->setSelectionBehavior(QAbstractItemView::SelectRows);
QTableWidgetItem *item[10];
QString bookName[5] = {"书名1","书名2","书名3","书名4","书名5"};
for(int i=0; i<5; i++)
{
item[i] = new QTableWidgetItem;
item[i]->setText(bookName[i]);
//3个参数分别是行号，列号，和要放的元素
table->setItem(i,0,item[i]);
}
setCentralWidget(table);
}
QTabWidget
mainwindow.cpp
#include "mainwindow.h"
#include <QTabWidget>
#include <QWidget>
#include <QHBoxLayout>
MainWindow::MainWindow(QWidget *parent)
: QMainWindow(parent)
{
QTabWidget *tabWidget = new QTabWidget;
QWidget *mainWidget = new QWidget;
QWidget *firstWidget = new QWidget;
QWidget *secondWidget = new QWidget;
QWidget *thirdWidget = new QWidget;
tabWidget->addTab(firstWidget,tr("第一页"));
tabWidget->addTab(secondWidget,tr("第二页"));
tabWidget->addTab(thirdWidget,tr("第三页"));
QHBoxLayout *mainLayout = new QHBoxLayout;
mainLayout->addWidget(tabWidget);
mainWidget->setLayout(mainLayout);
setCentralWidget(mainWidget);
}
QTreeWidget
mainwindow.cpp
#include "mainwindow.h"
#include <QTreeWidget>
#include <QTreeWidgetItem>
#include <QList>
#include <QStringList>
MainWindow::MainWindow(QWidget *parent)
: QMainWindow(parent)
{
QTreeWidget *treeWidget = new QTreeWidget();
QStringList headers;
headers << "Name"
<< "Numbers";
treeWidget->setHeaderLabels(headers);
QTreeWidgetItem *root = new QTreeWidgetItem(treeWidget);
root->setText(0,"root");
root->setText(1,"0");
//直接指定父对象
QTreeWidgetItem *leaf1 = new QTreeWidgetItem(root);
leaf1->setText(0,"leaf1");
leaf1->setText(1,"1");
//先不指定父对象，以后被添加
QTreeWidgetItem *leaf2 = new QTreeWidgetItem();
leaf2->setText(0,"leaf2");
leaf2->setText(1,"2");
root->addChild(leaf2);
QList<QTreeWidgetItem*> items;
for(int i=0; i<10; i++)
items.append(new QTreeWidgetItem((QTreeWidget*)0,QStringList(QString("ListItem%1").arg(i))));
treeWidget->insertTopLevelItems(1,items);
setCentralWidget(treeWidget);
}
QListWidget
#include "mainwindow.h"
#include 
QListWidget实现文件组的选择
mainwindow.cpp
#include "mainwindow.h"
#include "ui_mainwindow.h"
#include 
从XML中解析出来的数据显示在QTableWidget中
mainwindow.h
#ifndef MAINWINDOW_H
#define MAINWINDOW_H
#include mainwindow.cpp
#include "mainwindow.h"
#include "ui_mainwindow.h"
#include
{
QDomElement e = list.at(i).toElement();
if(e.attribute("编号") == ui->lineEdit->text())
{
if(operate == "delete")
{
QDomElement root = doc.documentElement();
root.removeChild(list.at(i));
file.setFileName("my.xml");
if(!file.open(QIODevice::WriteOnly | QIODevice::Truncate))
return;
QTextStream out(&file);
doc.save(out,4);
file.close();
statusBar()->showMessage("删除成功",2000);
}
else if(operate == "update")
{
QDomNodeList child = list.at(i).childNodes();
//将子节点的第一个节点即文本节点的内容改变
child.at(0).toElement().firstChild().setNodeValue(ui->lineEdit_2->text());
child.at(1).toElement().firstChild().setNodeValue(ui->lineEdit_3->text());
file.setFileName("my.xml");
if(!file.open(QIODevice::WriteOnly | QIODevice::Truncate))
return;
QTextStream out(&file);
doc.save(out,4);
file.close();
statusBar()->showMessage("更改成功",2000);
}
else if(operate == "query")
{
ui->tableWidget->clear();
//清除的时候会把标题也清除，所以重新写一下标题
QStringList header;
header << "编号" << "书名" << "作者";
ui->tableWidget->setHorizontalHeaderLabels(header);
ui->tableWidget->setRowCount(1);
QTableWidgetItem *item = new QTableWidgetItem;
item->setText(e.attribute("编号"));
ui->tableWidget->setItem(0,0,item);
QDomNodeList list = e.childNodes();
for(int i=0; i
{
QDomNode node = list.at(i);
if(node.isElement())
{
QTableWidgetItem *item = new QTableWidgetItem;
if(node.toElement().tagName() == "书名")
{
item->setText(node.toElement().text());
ui->tableWidget->setItem(0,1,item);
}
else if(node.toElement().tagName() == "作者")
{
item->setText(node.toElement().text());
ui->tableWidget->setItem(0,2,item);
}
}
}
statusBar()->showMessage("查询成功",2000);
}
}
}
}
void MainWindow::on_queryBtn_clicked()
{
doXML("query");
}
void MainWindow::on_deleteBtn_clicked()
{
doXML("delete");
}
void MainWindow::on_updateBtn_clicked()
{
doXML("update");
}
void MainWindow::on_insertBtn_clicked()
{
QFile file("my.xml");
if(!file.open(QIODevice::ReadOnly))
return;
QDomDocument doc;
if(!doc.setContent(&file))
{
file.close();
return;
}
file.close();
QDomElement root = doc.documentElement();
QDomElement book = doc.createElement("图书");
QDomAttr id = doc.createAttribute("编号");
QDomElement title = doc.createElement("书名");
QDomElement author = doc.createElement("作者");
QDomText text;
QString lastNum = root.lastChild().toElement().attribute("编号");
int count = lastNum.toInt() + 1;
id.setValue(QString::number(count));
book.setAttributeNode(id);
text = doc.createTextNode(ui->lineEdit_2->text());
title.appendChild(text);
text = doc.createTextNode(ui->lineEdit_3->text());
author.appendChild(text);
book.appendChild(title);
book.appendChild(author);
root.appendChild(book);
if(!file.open(QIODevice::WriteOnly | QIODevice::Truncate))
return;
QTextStream out(&file);
doc.save(out,4);
file.close();
}
void MainWindow::on_loadBtn_clicked()
{
QFile file("my.xml");
if(!file.open(QIODevice::ReadOnly))
return;
QDomDocument doc;
if(!doc.setContent(&file))
{
file.close();
return;
}
file.close();
//返回根元素
QDomElement root = doc.documentElement();
//返回第一个节点
QDomNode n = root.firstChild();
//记录是表格的第几行
int row = -1;
//table如何你设置了5列，它会自动加上一列，显示行号，这个就是设置不要系统自动加的那一列
ui->tableWidget->verticalHeader()->setVisible(false);
while(!n.isNull())
{
if(n.isElement())
{
row++;
//设置表格的行数不然不会显示
ui->tableWidget->setRowCount(row+1);
QDomElement e = n.toElement();
QTableWidgetItem *item = new QTableWidgetItem;
item->setText(e.attribute("编号"));
ui->tableWidget->setItem(row,0,item);
QDomNodeList list = e.childNodes();
for(int i=0; i
{
QDomNode node = list.at(i);
if(node.isElement())
{
QTableWidgetItem *item = new QTableWidgetItem;
if(node.toElement().tagName() == "书名")
{
item->setText(node.toElement().text());
ui->tableWidget->setItem(row,1,item);
}
else if(node.toElement().tagName() == "作者")
{
item->setText(node.toElement().text());
ui->tableWidget->setItem(row,2,item);
}
}
}
}
n = n.nextSibling();
}
//显示加载完毕,2秒钟后自动消失
statusBar()->showMessage("加载完毕",2000);
}
把bin文件展示成图片显示出来
想看一个bin文件里的图片，就写了这个工具，宽度和高度设置图片的大小，时间设置自动播放的间隔，位置显示读取到文件的哪个位置，宽度高度和时间可以不用设置，有默认值，主要思路是把3个字节转化成3个0-255int值，这3个值为RGB值，构造颜色，然后把像素画出来
mainwindow.h
#ifndef MAINWINDOW_H
#define MAINWINDOW_H
#include mainwindow.cpp
#include "mainwindow.h"
#include "ui_mainwindow.h"
#include if(!file.open(QIODevice::ReadOnly))
return;
QImage mainimg(width,height,QImage::Format_ARGB32);
QPainter painter(&mainimg);
QByteArray temp1;
while(!file.atEnd())
{
QByteArray temp = file.read(100);
temp1.append(temp);
}
QByteArray store = temp1.toHex();
fileData = store.data();
int y = 0;
for(int i=0; iint x = 0;
for(int j=0; j6);
cursor += 6;
int a[3];
for(int k=0; kif(k % 2 == 0)
{
QString str = data.mid(k,2);
bool ok;
a[k/2] = str.toInt(&ok,16);
}
}
QRectF r(x,y,1,1);
QColor color(a[0],a[1],a[2]);
painter.setPen(color);
painter.drawRect(r);
}
}
QPixmap mainmap=QPixmap::fromImage(mainimg);
ui->label_3->setPixmap(mainmap);
ui->label_3->setVisible(true);
file.close();
}
void MainWindow::set()
{
QString str1 = ui->lineEdit->text();
width = str1.toInt();
QString str2 = ui->lineEdit_2->text();
height = str2.toInt();
statusBar()->showMessage(tr("设置参数成功"));
}
void MainWindow::next()
{
QString address = QString::number(cursor/2,16).toUpper();
QString str;
int len = address.length();
for(int i=0; i<8-len; i++)
str += "0";
address = str + address;
ui->lineEdit_4->setText(address);
QImage mainimg(width,height,QImage::Format_ARGB32);
QPainter painter(&mainimg);
int y = 0;
for(int i=0; iint x = 0;
for(int j=0; jif(cursor + 5 > fileData.length())
{
statusBar()->showMessage(tr("读到文件尾部"));
return;
}
QString data = fileData.mid(cursor,6);
cursor += 6;
int a[3];
for(int k=0; kif(k % 2 == 0)
{
QString str = data.mid(k,2);
bool ok;
a[k/2] = str.toInt(&ok,16);
}
}
QRectF r(x,y,1,1);
QColor color(a[0],a[1],a[2]);
painter.setPen(color);
painter.drawRect(r);
}
}
QPixmap mainmap=QPixmap::fromImage(mainimg);
ui->label_3->setPixmap(mainmap);
ui->label_3->setVisible(true);
}
void MainWindow::autoPlay()
{
if(ui->checkBox->isChecked())
{
int src;
QString str = ui->lineEdit_3->text();
if(str == "")
src = 1000;
else
src = str.toInt();
timer->setInterval(src);
timer->start();
}
else
timer->stop();
}
QXmlStreamReader和QXmlStreamWriter
#include my.xml
<library>
<book id="01">
<title>Qttitle>
<author>youauthor>
book>
<book id="02">
<title>Linuxtitle>
<author>myauthor>
book>
library>
UDP发送和接收数据
mainwindow.h
#ifndef MAINWINDOW_H
#define MAINWINDOW_H
#include mainwindow.cpp
#include "mainwindow.h"
#include "ui_mainwindow.h"
#include 
QStackedWidget类和QListWidget混合使用
http://blog.csdn.net/a649518776/article/details/6636578
QToolBox使用
http://blog.sina.com.cn/s/blog_81cad10f0102v2zl.html