Qt 文件搜索（写入文本文件）

代码无意间在网上找到，下载回来后改了几个格式，编译后经测试可以正常使用，这个个文件搜索的很好的例子，有两种搜索方式：一种是按文件名作为关键字进行搜索，一种是以文档中所包含的关键字进行搜索，贴两张图先：

上图为两个文本文档(都位于C盘根目录下)，其中都包含有"2010-12-05"这样的关键字，一会就用这个关键字搜索看看行不行...

注意：这个实例程序无法进行递归的查找，只能搜索指定目录这一层的文件，另外它只能匹配文本文档。

 1 #ifndef WINDOW_H
 2 #define WINDOW_H
 3 
 4 #include<QDialog>
 5 class QComboBox;
 6 class QDir;
 7 class QLabel;
 8 class QPushButton;
 9 class QTableWidget;
10 
11 class Window:public QDialog
12 {
13 Q_OBJECT
14 public:
15 Window(QWidget *parent=0);
16 private slots:
17     void browse();
18     void find();
19 private:
20     QStringList findFiles(const QDir &directory,const QStringList &files,
21                           const QString &text);
22     void showFiles(const QDir &directory,const QStringList &files);
23     QPushButton *createButton(const QString &text,const char *member);
24     QComboBox *createComboBox(const QString &text = QString());
25     void createFilesTable();
26     QComboBox *fileComboBox;
27     QComboBox *textComboBox;
28     QComboBox *directoryComboBox;
29     QLabel *fileLabel;
30     QLabel *textLabel;
31     QLabel *directoryLabel;
32     QLabel *filesFoundLabel;
33     QPushButton *browseButton;
34     QPushButton *findButton;
35     QTableWidget *filesTable;
36 };
37 
38 #endif
39 

  1 #include <QtGui>
  2 #include "window.h"
  3 Window::Window(QWidget *parent)
  4     : QDialog(parent)
  5 {
  6     browseButton = createButton(tr("&Browse..."),SLOT(browse()));
  7     findButton = createButton(tr("&Find"),SLOT(find()));
  8     fileComboBox = createComboBox(tr("*"));
  9     textComboBox = createComboBox();
 10     directoryComboBox = createComboBox(QDir::currentPath());
 11     fileLabel = new QLabel(tr("Named:"));
 12     textLabel = new QLabel(tr("Containing text:"));
 13     directoryLabel = new QLabel(tr("In directory:"));
 14     filesFoundLabel = new QLabel;
 15     createFilesTable();
 16     QHBoxLayout *buttonsLayout = new QHBoxLayout;
 17     buttonsLayout->addStretch();
 18     buttonsLayout->addWidget(findButton);
 19     QGridLayout *mainLayout = new QGridLayout;
 20     mainLayout->addWidget(fileLabel,0,0);
 21     mainLayout->addWidget(fileComboBox,0,1,1,2);
 22     mainLayout->addWidget(textLabel,1,0);
 23     mainLayout->addWidget(textComboBox,1,1,1,2);
 24     mainLayout->addWidget(directoryLabel,2,0);
 25     mainLayout->addWidget(directoryComboBox,2,1);
 26     mainLayout->addWidget(browseButton,2,2);
 27     mainLayout->addWidget(filesTable,3,0,1,3);
 28     mainLayout->addWidget(filesFoundLabel,4,0);
 29     mainLayout->addLayout(buttonsLayout,5,0,1,3);
 30     setLayout(mainLayout);
 31     setWindowTitle(tr("Find Files"));
 32     resize(700,300);
 33 }
 34 void Window::browse()
 35 {
 36     QString directory = QFileDialog::getExistingDirectory(this,
 37                                QObject::tr("Find Files"),QDir::currentPath());
 38     if (!directory.isEmpty()) {
 39         directoryComboBox->addItem(directory);
 40         directoryComboBox->setCurrentIndex(directoryComboBox->currentIndex() + 1);
 41     }
 42 }
 43 void Window::find()
 44 {
 45     filesTable->setRowCount(0);
 46     QString fileName = fileComboBox->currentText();
 47     QString text = textComboBox->currentText();
 48     QString path = directoryComboBox->currentText();
 49     QDir directory = QDir(path);
 50     QStringList files;
 51     if (fileName.isEmpty()) fileName = "*";
 52     files = directory.entryList(QStringList(fileName),
 53                                 QDir::Files | QDir::NoSymLinks);
 54     if (!text.isEmpty())
 55         files = findFiles(directory,files,text);
 56     showFiles(directory,files);
 57 }
 58 QStringList Window::findFiles(const QDir &directory,const QStringList &files,
 59                               const QString &text)
 60 {
 61     QProgressDialog progressDialog(this);
 62     progressDialog.setCancelButtonText(tr("&Cancel"));
 63     progressDialog.setRange(0,files.size());
 64     progressDialog.setWindowTitle(tr("Find Files"));
 65     QStringList foundFiles;
 66     for (int i = 0; i < files.size(); ++i) {
 67         progressDialog.setValue(i);
 68         progressDialog.setLabelText(tr("Searching file number %1 of %2...")
 69                                     .arg(i).arg(files.size()));
 70         qApp->processEvents();
 71         if (progressDialog.wasCanceled()) break;
 72         QFile file(directory.absoluteFilePath(files[i]));
 73         if (file.open(QIODevice::ReadOnly)) {
 74             QString line;
 75             QTextStream in(&file);
 76 
 77             while (!in.atEnd()) {
 78                 if (progressDialog.wasCanceled()) break;
 79                 line = in.readLine();
 80                 if (line.contains(text)) {
 81                     foundFiles << files[i];
 82                     break;
 83                 }
 84             }
 85         }
 86     }
 87     return foundFiles;
 88 }
 89 void Window::showFiles(const QDir &directory,const QStringList &files)
 90 {
 91     for (int i = 0; i < files.size(); ++i) {
 92         QFile file(directory.absoluteFilePath(files[i]));
 93         qint64 size = QFileInfo(file).size();
 94         QTableWidgetItem *fileNameItem = new QTableWidgetItem(files[i]);
 95         fileNameItem->setFlags(Qt::ItemIsEnabled);
 96         QTableWidgetItem *sizeItem = new QTableWidgetItem(tr("%1 KB")
 97                                              .arg(int((size + 1023) / 1024)));
 98         sizeItem->setTextAlignment(Qt::AlignRight | Qt::AlignVCenter);
 99         sizeItem->setFlags(Qt::ItemIsEnabled);
100         int row = filesTable->rowCount();
101         filesTable->insertRow(row);
102         filesTable->setItem(row,0,fileNameItem);
103         filesTable->setItem(row,1,sizeItem);
104     }
105     filesFoundLabel->setText(tr("%1 file(s) found").arg(files.size()));
106 }
107 QPushButton *Window::createButton(const QString &text,const char *member)
108 {
109     QPushButton *button = new QPushButton(text);
110     connect(button,SIGNAL(clicked()),this,member);
111     return button;
112 }
113 QComboBox *Window::createComboBox(const QString &text)
114 {
115     QComboBox *comboBox = new QComboBox;
116     comboBox->setEditable(true);
117     comboBox->addItem(text);
118     comboBox->setSizePolicy(QSizePolicy::Expanding,QSizePolicy::Preferred);
119     return comboBox;
120 }
121 void Window::createFilesTable()
122 {
123     filesTable = new QTableWidget(0,2);
124     QStringList labels;
125     labels << tr("File Name") << tr("Size");
126     filesTable->setHorizontalHeaderLabels(labels);
127     filesTable->horizontalHeader()->setResizeMode(0,QHeaderView::Stretch);
128     filesTable->verticalHeader()->hide();
129     filesTable->setShowGrid(false);
130 }
131 

 1 #include "window.h"
 2 #include <QApplication>
 3 
 4  int main(int argc,char *argv[])
 5 {
 6     QApplication app(argc,argv);
 7     Window window;
 8     window.show();
 9     return app.exec();
10 }
11  

http://www.cnblogs.com/hicjiajia/archive/2010/12/05/1896823.html