QT文件查找

来源：互联网发布：义乌美工培训ywxdf 编辑：程序博客网时间：2024/06/07 01:21

转载自：http://www.cnblogs.com/rollenholt/archive/2012/04/13/2446531.html

先看看效果图吧，可以查找文件，以及通过文件内容进行查找

#ifndef WINDOW_H#define WINDOW_H#include <QDialog>#include <QDir>QT_BEGIN_NAMESPACEclass QComboBox;class QLabel;class QPushButton;class QTableWidget;class QTableWidgetItem;QT_END_NAMESPACE//! [0]class Window : public QDialog{    Q_OBJECTpublic:    Window(QWidget *parent = 0);private slots:    void browse();    void find();    void openFileOfItem(int row, int column);private:    QStringList findFiles(const QStringList &files, const QString &text);    void showFiles(const QStringList &files);    QPushButton *createButton(const QString &text, const char *member);    QComboBox *createComboBox(const QString &text = QString());    void createFilesTable();    QComboBox *fileComboBox;    QComboBox *textComboBox;    QComboBox *directoryComboBox;    QLabel *fileLabel;    QLabel *textLabel;    QLabel *directoryLabel;    QLabel *filesFoundLabel;    QPushButton *browseButton;    QPushButton *findButton;    QTableWidget *filesTable;    QDir currentDir;};//! [0]#endif

#include <QtGui>#include "window.h"//! [0]Window::Window(QWidget *parent)    : QDialog(parent){    browseButton = createButton(tr("&Browse..."), SLOT(browse()));    findButton = createButton(tr("&Find"), SLOT(find()));    fileComboBox = createComboBox(tr("*"));    textComboBox = createComboBox();    directoryComboBox = createComboBox(QDir::currentPath());    fileLabel = new QLabel(tr("Named:"));    textLabel = new QLabel(tr("Containing text:"));    directoryLabel = new QLabel(tr("In directory:"));    filesFoundLabel = new QLabel;    createFilesTable();//! [0]//! [1]    QHBoxLayout *buttonsLayout = new QHBoxLayout;    buttonsLayout->addStretch();    buttonsLayout->addWidget(findButton);    QGridLayout *mainLayout = new QGridLayout;    mainLayout->addWidget(fileLabel, 0, 0);    mainLayout->addWidget(fileComboBox, 0, 1, 1, 2);    mainLayout->addWidget(textLabel, 1, 0);    mainLayout->addWidget(textComboBox, 1, 1, 1, 2);    mainLayout->addWidget(directoryLabel, 2, 0);    mainLayout->addWidget(directoryComboBox, 2, 1);    mainLayout->addWidget(browseButton, 2, 2);    mainLayout->addWidget(filesTable, 3, 0, 1, 3);    mainLayout->addWidget(filesFoundLabel, 4, 0, 1, 3);    mainLayout->addLayout(buttonsLayout, 5, 0, 1, 3);    setLayout(mainLayout);    setWindowTitle(tr("Find Files"));    resize(700, 300);}//! [1]//! [2]void Window::browse(){    QString directory = QFileDialog::getExistingDirectory(this,                               tr("Find Files"), QDir::currentPath());    if (!directory.isEmpty()) {        if (directoryComboBox->findText(directory) == -1)            directoryComboBox->addItem(directory);        directoryComboBox->setCurrentIndex(directoryComboBox->findText(directory));    }}//! [2]static void updateComboBox(QComboBox *comboBox){    if (comboBox->findText(comboBox->currentText()) == -1)        comboBox->addItem(comboBox->currentText());}//! [3]void Window::find(){    filesTable->setRowCount(0);    QString fileName = fileComboBox->currentText();    QString text = textComboBox->currentText();    QString path = directoryComboBox->currentText();//! [3]    updateComboBox(fileComboBox);    updateComboBox(textComboBox);    updateComboBox(directoryComboBox);//! [4]    currentDir = QDir(path);    QStringList files;    if (fileName.isEmpty())        fileName = "*";    files = currentDir.entryList(QStringList(fileName),                                 QDir::Files | QDir::NoSymLinks);    if (!text.isEmpty())        files = findFiles(files, text);    showFiles(files);}//! [4]//! [5]QStringList Window::findFiles(const QStringList &files, const QString &text){    QProgressDialog progressDialog(this);    progressDialog.setCancelButtonText(tr("&Cancel"));    progressDialog.setRange(0, files.size());    progressDialog.setWindowTitle(tr("Find Files"));//! [5] //! [6]    QStringList foundFiles;    for (int i = 0; i < files.size(); ++i) {        progressDialog.setValue(i);        progressDialog.setLabelText(tr("Searching file number %1 of %2...")                                    .arg(i).arg(files.size()));        qApp->processEvents();//! [6]        if (progressDialog.wasCanceled())            break;//! [7]        QFile file(currentDir.absoluteFilePath(files[i]));        if (file.open(QIODevice::ReadOnly)) {            QString line;            QTextStream in(&file);            while (!in.atEnd()) {                if (progressDialog.wasCanceled())                    break;                line = in.readLine();                if (line.contains(text)) {                    foundFiles << files[i];                    break;                }            }        }    }    return foundFiles;}//! [7]//! [8]void Window::showFiles(const QStringList &files){    for (int i = 0; i < files.size(); ++i) {        QFile file(currentDir.absoluteFilePath(files[i]));        qint64 size = QFileInfo(file).size();        QTableWidgetItem *fileNameItem = new QTableWidgetItem(files[i]);        fileNameItem->setFlags(fileNameItem->flags() ^ Qt::ItemIsEditable);        QTableWidgetItem *sizeItem = new QTableWidgetItem(tr("%1 KB")                                             .arg(int((size + 1023) / 1024)));        sizeItem->setTextAlignment(Qt::AlignRight | Qt::AlignVCenter);        sizeItem->setFlags(sizeItem->flags() ^ Qt::ItemIsEditable);        int row = filesTable->rowCount();        filesTable->insertRow(row);        filesTable->setItem(row, 0, fileNameItem);        filesTable->setItem(row, 1, sizeItem);    }    filesFoundLabel->setText(tr("%1 file(s) found").arg(files.size()) +                             (" (Double click on a file to open it)"));}//! [8]//! [9]QPushButton *Window::createButton(const QString &text, const char *member){    QPushButton *button = new QPushButton(text);    connect(button, SIGNAL(clicked()), this, member);    return button;}//! [9]//! [10]QComboBox *Window::createComboBox(const QString &text){    QComboBox *comboBox = new QComboBox;    comboBox->setEditable(true);    comboBox->addItem(text);    comboBox->setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Preferred);    return comboBox;}//! [10]//! [11]void Window::createFilesTable(){    filesTable = new QTableWidget(0, 2);    filesTable->setSelectionBehavior(QAbstractItemView::SelectRows);    QStringList labels;    labels << tr("File Name") << tr("Size");    filesTable->setHorizontalHeaderLabels(labels);    filesTable->horizontalHeader()->setResizeMode(0, QHeaderView::Stretch);    filesTable->verticalHeader()->hide();    filesTable->setShowGrid(false);    connect(filesTable, SIGNAL(cellActivated(int,int)),            this, SLOT(openFileOfItem(int,int)));}//! [11]//! [12]void Window::openFileOfItem(int row, int /* column */){    QTableWidgetItem *item = filesTable->item(row, 0);    QDesktopServices::openUrl(QUrl::fromLocalFile(currentDir.absoluteFilePath(item->text())));}//! [12]

#include <QApplication>#include "window.h"int main(int argc, char *argv[]){    QApplication app(argc, argv);    Window window;    window.show();    return app.exec();}

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