异度部落格

QT学习笔记之十六 ImageSpaceCompute

Posted on 2009-07-29 In 技术笔记

这个软件用于计算文件夹中图片所占空间大小

程序很短，直接看代码吧

main.cpp

#include <QtGui>
#include <iostream>
#include <string>
/**
  计算文件中图片所占大小
  */
qlonglong imageSpaceCompute(const QString &path)
{
    QDir dir(path);
    qlonglong size = 0;
    QStringList filters;
    foreach(QByteArray format,QImageReader::supportedImageFormats())
        filters += "*." + format;
    foreach(QString file, dir.entryList(filters,QDir::Files))   //entryList 返回文件夹下满足条件的文件名列表
        size += QFileInfo(dir,file).size();
    //递归，计算子目录中的图片大小
    foreach (QString subDir, dir.entryList(QDir::Dirs | QDir::NoDotAndDotDot))
        size += imageSpaceCompute(path + QDir::separator() + subDir);
    return size;
}
int main(int argc, char *argv[])
{
    QCoreApplication a(argc, argv);
    QString path = QDir::currentPath();
    std::cout << "Space used by imaged in" << qPrintable(path)
              << " and its subdirectories is " << (imageSpaceCompute(path) / 1024) << " KB" << std::endl;
    return 0;
}

要是不能运行看看项目配置文件，这里附上我的

QT       = core gui xml
TARGET = ImageSpaceCompute
CONFIG   += console
CONFIG   -= app_bundle
TEMPLATE = app

SOURCES += main.cpp

软件截图：

用Qt4 连接MySQL

Posted on 2009-07-29 In 技术笔记

最近学习 Qt4 的数据库编程方面，早上安装了下 MySQL，这里写 Qt4 连接 MySQL 的方法

首先，自己先去建立一个数据库名为，DB_Name

然后，自己可以尝试下连接，利用 mysql-admin 是个很好用的工具，保证数据连接是没有问题的，这里用的 Server Name 就用本地的吧(localhost)

保证数据库连接没问题以后，就可以参考下这下面的代码了（仅供参考，有问题请来信），我把它写成函数的形式，方便以后调用

bool createConnection()
{
    QSqlDatabase db = QSqlDatabase::addDatabase("QMYSQL");
    db.setHostName("localhost");
    db.setDatabaseName("DB_Name");
    db.setUserName("root");
    db.setPassword("123456");
    if (!db.open()) {
        QMessageBox::warning(0, QObject::tr("Database Error"),
                             db.lastError().text());
        return false;
    }
    return true;
}

Sever Name：localhost 使用本地连接

数据库名：DB_Name

登录账户：root

密码：123456

QT学习笔记之十一 SymbolPicker

Posted on 2009-07-18 In 技术笔记

最近太忙了，都没怎么看 Qt 鄙视下自己....

不说了，放代码

symbolpicker.h

#ifndef SYMBOLPICKER_H
#define SYMBOLPICKER_H
#include <QtGui/QDialog>
#include <QMap>
class QDialogButtonBox;
class QIcon;
class QListWidget;
namespace Ui
{
    class SymbolPicker;
}
class SymbolPicker : public QDialog
{
    Q_OBJECT
public:
    SymbolPicker(const QMap<int,QString> &symbolMap,QWidget *parent = 0);
    ~SymbolPicker();
    int selected() const {return id;}
    void done(int result);
private:
    Ui::SymbolPicker *ui;
    QIcon iconForSymbol(const QString &symbolName);
    QListWidget *listWidget;
    QDialogButtonBox *buttonBox;
    int id;
};
#endif // SYMBOLPICKER_H

symbolpicker.cpp

#include<QtGui>
#include "symbolpicker.h"
#include "ui_symbolpicker.h"
SymbolPicker::SymbolPicker(const QMap<int,QString> &symbolMap,QWidget *parent)
    : QDialog(parent), ui(new Ui::SymbolPicker)
{
    ui->setupUi(this);
    id = -1; //设置id默认值
    listWidget = new QListWidget;
    listWidget->setIconSize(QSize(60,60));
    QMapIterator<int,QString> i(symbolMap);
    while(i.hasNext()) {
        i.next();
        QListWidgetItem *item = new QListWidgetItem(i.value(),listWidget);
        item->setIcon(iconForSymbol(i.value()));
        item->setData(Qt::UserRole,i.key());
    }
   buttonBox = new QDialogButtonBox(QDialogButtonBox::Ok| QDialogButtonBox::Cancel);
    connect(buttonBox,SIGNAL(accepted()),this,SLOT(accept()));
    connect(buttonBox,SIGNAL(rejected()),this,SLOT(reject()));
    QVBoxLayout *layout = new QVBoxLayout;
    layout->addWidget(listWidget);
    layout->addWidget(buttonBox);
    setLayout(layout);
    setWindowTitle(tr("Symbol Picker"));
}
SymbolPicker::~SymbolPicker()
{
    delete ui;
}
void SymbolPicker::done(int result)
{
    id = -1;
    if (result == QDialog::Accepted) {
        QListWidgetItem *item = listWidget->currentItem();
        if (item)
            id = item->data(Qt::UserRole).toInt();
    }
    QDialog::done(result);
}
QIcon SymbolPicker::iconForSymbol(const QString &symbolName)
{
    QString fileName = ":/images/" + symbolName.toLower();
    fileName.replace(' ','-');
    return QIcon(fileName);
}

symbolpicker.qrc (资源文件)

<RCC>
<qresource>
    <file>images/killua.png</file>
</qresource>
</RCC>

刚开始 icon 显示一直有问题，后来配置了下资源文件就 OK 了...

QT学习笔记之十三 DirectoryViewer

Posted on 2009-07-18 In 技术笔记

这个还是练习项视图，用于浏览目录，可以添加新文件夹和删除文件或文件夹

directoryviewer.h

#ifndef DIRECTORYVIEWER_H
#define DIRECTORYVIEWER_H
#include <QtGui/QDialog>
class QDialogButtonBox;
class QDirModel;
class QTreeView;
namespace Ui
{
    class DirectoryViewer;
}
class DirectoryViewer : public QDialog
{
    Q_OBJECT
public:
    DirectoryViewer(QWidget *parent = 0);
    ~DirectoryViewer();
private slots:
    void createDirectory();
    void remove();
private:
    Ui::DirectoryViewer *ui;
    QTreeView *treeView;
    QDirModel *model;
    QDialogButtonBox *buttonBox;
};
#endif // DIRECTORYVIEWER_H

directoryviewer.cpp

#include <QtGui>
#include "directoryviewer.h"
#include "ui_directoryviewer.h"
/**
  构造函数
  */
DirectoryViewer::DirectoryViewer(QWidget *parent)
    : QDialog(parent), ui(new Ui::DirectoryViewer)
{
    ui->setupUi(this);
    //model
    model = new QDirModel;
    model->setReadOnly(false);
    model->setSorting(QDir::DirsFirst | QDir::IgnoreCase | QDir::Name);
    //treeView
    treeView = new QTreeView;
    treeView->setModel(model);
    treeView->header()->setStretchLastSection(true);
    treeView->header()->setSortIndicator(0,Qt::AscendingOrder);
    treeView->header()->setSortIndicatorShown(true);
    treeView->header()->setClickable(true);
    QModelIndex index = model->index(QDir::currentPath());
    treeView->expand(index);
    treeView->scrollTo(index);
    treeView->resizeColumnToContents(0);
    //ButtonBox
    buttonBox = new QDialogButtonBox(Qt::Horizontal);
    QPushButton *mkdirButton = buttonBox->addButton(tr("&Create Directory"),QDialogButtonBox::ActionRole);
    QPushButton *removeButton = buttonBox->addButton(tr("&Remove"),QDialogButtonBox::ActionRole);
    buttonBox->addButton(tr("&Quit"),QDialogButtonBox::AcceptRole);

//signal and slot
connect(mkdirButton,SIGNAL(clicked()),this,SLOT(createDirectory()));
connect(removeButton,SIGNAL(clicked()),this,SLOT(remove()));
connect(buttonBox,SIGNAL(accepted()),this,SLOT(accept()));
//Layout
QVBoxLayout *layout = new QVBoxLayout;
layout->addWidget(treeView);
layout->addWidget(buttonBox);
setLayout(layout);
setWindowTitle(tr("Directory Viewer by Killua"));
}
/**
析构函数
*/
DirectoryViewer::~DirectoryViewer()
{
delete ui;
}
/**
文件夹创建
*/
void DirectoryViewer::createDirectory()
{
QModelIndex index = treeView->currentIndex();
if (!index.isValid())
return ;
QString dirName = QInputDialog::getText(this,tr("Create Directory"),tr("Directory Name"));
if (!dirName.isEmpty()) {
if (!model->mkdir(index,dirName).isValid())
QMessageBox::information(this,tr("Create Directory"),tr("Failed to create"));
}
}
/**
删除
*/
void DirectoryViewer::remove()
{
QModelIndex index =treeView->currentIndex();
if (!index.isValid())
return ;
bool ok;
if (model->fileInfo(index).isDir()) {
ok = model->rmdir(index);
} else {
ok = model->remove(index);
}
if (!ok)
QMessageBox::information(this,tr("Remove"),tr("Failed to remvoe"));
}

软件截图：

QT学习笔记之十二 ListViewer

Posted on 2009-07-18 In 技术笔记

这个主要练习项视图的显示并设置了 insert 和 delete 功能

listviewer.h

#ifndef LISTVIEWER_H
#define LISTVIEWER_H
#include <QtGui/QDialog>
class QDialogButtonBox;
class QListView;
class QStringListModel;
namespace Ui
{
    class ListViewer;
}
class ListViewer : public QDialog
{
    Q_OBJECT
public:
    ListViewer(const QStringList &itemList,QWidget *parent = 0);
    ~ListViewer();
    QStringList itemList() const;
private slots:
    void insert();
    void del();
private:
    Ui::ListViewer *ui;
    QListView *listView;
    QDialogButtonBox *buttonBox;
    QStringListModel *model;
};
#endif // LISTVIEWER_H

listviewer.cpp

#include <QtGui>
#include "listviewer.h"
#include "ui_listviewer.h"
ListViewer::ListViewer(const QStringList &itemList,QWidget *parent)
    : QDialog(parent), ui(new Ui::ListViewer)
{
    ui->setupUi(this);
    //model
    model = new QStringListModel(this);
    model->setStringList(itemList);
    //listView
    listView = new QListView;
    listView->setModel(model);
    listView->setEditTriggers(QAbstractItemView::AnyKeyPressed | QAbstractItemView::DoubleClicked); //The QAbstractItemView class provides the basic functionality for item view classes.
    //buttonBox
    buttonBox = new QDialogButtonBox();
    QPushButton *insertButton = buttonBox->addButton(tr("&Insert"),QDialogButtonBox::ActionRole);  //ActionRole:Clicking the button causes changes to the elements within the dialog
    QPushButton *deleteButton = buttonBox->addButton(tr("&Delete"),QDialogButtonBox::ActionRole);
    buttonBox->addButton(QDialogButtonBox::Ok);
    buttonBox->addButton(QDialogButtonBox::Cancel);
    //signals and slots
    connect(insertButton,SIGNAL(clicked()),this,SLOT(insert()));
    connect(deleteButton,SIGNAL(clicked()),this,SLOT(del()));
    connect(buttonBox,SIGNAL(accepted()),this,SLOT(accept()));
    connect(buttonBox,SIGNAL(rejected()),this,SLOT(reject()));
    //layout
    QVBoxLayout *layout = new QVBoxLayout;
    layout->addWidget(listView);
    layout->addWidget(buttonBox);
    setLayout(layout);
}
ListViewer::~ListViewer()
{
    delete ui;
}
QStringList ListViewer::itemList() const
{
    return model->stringList();
}
void ListViewer::insert()
{
    int row = listView->currentIndex().row();
    model->insertRows(row, 1);
    QModelIndex index=model->index(row);  //This class is used as an index into item models derived from QAbstractItemModel.
                                          //The index is used by item views, delegates, and selection models to locate an item in the model.
    listView->setCurrentIndex(index);
    listView->edit(index);
}
void ListViewer::del()
{
    model->removeRows(listView->currentIndex().row(),1);
}

QT学习笔记之十四 StringMatch

Posted on 2009-07-18 In 技术笔记

用于正则表达式，通配符，完整匹配三种方式

stringmatch.h

#ifndef STRINGMATCH_H
#define STRINGMATCH_H
#include <QtGui/QDialog>
class QComboBox;
class QLabel;
class QLineEdit;
class QListView;
class QSortFilterProxyModel;
class QStringListModel;
namespace Ui
{
    class StringMatch;
}
class StringMatch : public QDialog
{
    Q_OBJECT
public:
    StringMatch(QWidget *parent = 0);
    ~StringMatch();
private slots:
    void reapplyFilter();
private:
    Ui::StringMatch *ui;
    QStringListModel *sourceModel;
    QSortFilterProxyModel *proxyModel;
    QListView *listView;
    QLabel *filterLabel;
    QLabel *syntaxLabel;
    QLineEdit *filterLineEdit;
    QComboBox *syntaxComboBox;
};
#endif // STRINGMATCH_H

stringmatch.cpp

#include <QtGui>
#include "stringmatch.h"
#include "ui_stringmatch.h"
StringMatch::StringMatch(QWidget *parent)
    : QDialog(parent), ui(new Ui::StringMatch)
{
    ui->setupUi(this);
    QTextCodec::setCodecForCStrings(QTextCodec::codecForLocale());
    QTextCodec::setCodecForTr(QTextCodec::codecForName("utf8"));
    //sourceModel
    sourceModel = new QStringListModel(this);
    sourceModel->setStringList(QColor::colorNames());
    //proxyModel
    proxyModel = new QSortFilterProxyModel(this);
    proxyModel->setSourceModel(sourceModel);
    proxyModel->setFilterKeyColumn(0);
    //listView
    listView = new QListView;
    listView->setModel(proxyModel);
    listView->setEditTriggers(QAbstractItemView::NoEditTriggers);
    //filter
    filterLabel = new QLabel(tr("要匹配的字符串"));
    filterLineEdit = new QLineEdit;
    filterLabel->setBuddy(filterLineEdit);
    //syntax
    syntaxLabel = new QLabel("匹配方式选择");
    syntaxComboBox = new QComboBox;
    syntaxComboBox->addItem("正则表达式",QRegExp::RegExp);   //A rich Perl-like pattern matching syntax. This is the default.
    syntaxComboBox->addItem("通配符",QRegExp::Wildcard);   //This provides a simple pattern matching syntax similar to that used by shells (command interpreters) for "file globbing".
    syntaxComboBox->addItem("完全匹配",QRegExp::FixedString);   //This is equivalent to using the RegExp pattern on a string in which all metacharacters are escaped using
    //当filterLineEdit和syntaxComboBox
    connect(filterLineEdit,SIGNAL(textChanged(const QString &)),this,SLOT(reapplyFilter()));
    connect(syntaxComboBox,SIGNAL(currentIndexChanged(int)),this,SLOT(reapplyFilter()));
    //布局
    QGridLayout *layout = new QGridLayout;
    layout->addWidget(listView,0,0,1,2);
    layout->addWidget(filterLabel,1,0);
    layout->addWidget(filterLineEdit,1,1);
    layout->addWidget(syntaxLabel,2,0);
    layout->addWidget(syntaxComboBox,2,1);
    setLayout(layout);
    setWindowTitle(tr("String Matching"));
}
StringMatch::~StringMatch()
{
    delete ui;
}
void StringMatch::reapplyFilter()
{
    QRegExp::PatternSyntax syntax = QRegExp::PatternSyntax(syntaxComboBox->itemData(
                    syntaxComboBox->currentIndex()).toInt());
    QRegExp regExp(filterLineEdit->text(),Qt::CaseInsensitive,syntax);
    proxyModel->setFilterRegExp(regExp);
}

软件截图：

直到今天才把 Qt4 的中文乱码搞定太尴尬了.......鄙视下自己..... 只要程序中加入 QTextCodec::setCodecForCStrings(QTextCodec::codecForLocale()); QTextCodec::setCodecForTr(QTextCodec::codecForName("utf8"));

当然要看情况来说，你的环境可能是 GBK 或者其他的...

Qt4程序中文乱码解决方案

Posted on 2009-07-18 In 技术笔记

这个主要是编码的问题，我用的 Ubuntu，貌似 XP 就没有这个问题，蛮发下....

只要在程序种加上这两句：

QTextCodec::setCodecForCStrings(QTextCodec::codecForLocale());
 QTextCodec::setCodecForTr(QTextCodec::codecForName("utf8"));

具体编码要看具体环境了，可能是 GBK 或者 GB18030 或者其他的.....

PS:今天才搞懂，BS 自己阿....

MDI Editor 部分功能修正

Posted on 2009-07-10 In 技术笔记

今天晚上突然想到，前几天写那个 MDI Editor 少了拖拽功能支持，这里补充一下....

主要是对 Editor 类进行补充

在 editor.h 添加

//拖放
void dragEnterEvent(QDragEnterEvent *event);
void dropEvent(QDropEvent *event);

在 editor.cpp 添加

/**
  拖放的两个Event
  */
void Editor::dragEnterEvent(QDragEnterEvent *event)
{
    if(event->mimeData()->hasFormat("text/uri-list"))
        event->acceptProposedAction();
}
void Editor::dropEvent(QDropEvent *event)
{
    QList<QUrl> urls = event->mimeData()->urls();
    if(urls.isEmpty())
        return ;
    QString fileName = urls.first().toLocalFile();
    if (fileName.isEmpty())
        return ;
    if(readFile(fileName))
        setWindowTitle(tr("%1").arg(fileName));
}

OK.

PS：晚上才发现，我的工程名居然打错了..mdieditor 打成 mideditor 了...好尴尬...算了不改了，有不影响学习交流

重装xp后恢复wubi安装的Ubuntu启动菜单

Posted on 2009-07-07 In 技术笔记

1，把 ubuntu->winboot 文件夹下 wubidr 和 wubidr.mbr 两个文件拷到 C 盘根目录下

2，打开 boot.ini 文件，添加 c:/wubildr.mbf= "Ubuntu",保存修改

PS:boot.ini 在 C 盘的根目录下，要是看不到，进入文件夹选项，去掉“隐藏受保护的操作系统文件”选项，选中"显示所有文件和文件夹",就可以看到 boot.ini 了

Ubuntu安装飞信

Posted on 2009-07-06 In 技术笔记

下载地址：http://www.libfetion.cn/Linux_demoapp_download.html

如果不能运行安装依赖

sudo apt-get install libcurl3
sudo apt-get install automake libc-dev g++ libcurl4-openssl-dev
sudo apt-get install build-essential 
sudo apt-get install libcurl4-dev