Qt创建和删除文件小Demo（顺便讲了补全功能）

背景：笔者需要创建和删除多个pdd和多个pff文件（这些是自己创建的类型），一个个手动创建和删除很麻烦，就做了一款小软件解决此问题。

先看一下效果：

代码如下：

①、头文件：

#ifndef MAINWINDOW_H
 #define MAINWINDOW_H
 #include <QMainWindow>
 #include <QMessageBox>
 #include <QFile>
 #include <QDir>
 #include <QCompleter>
 #include <QDirModel>
 namespace Ui {
 class MainWindow;
 }
 class MainWindow : public QMainWindow
 {
     Q_OBJECT
 public:
     explicit MainWindow(QWidget *parent = 0);
     ~MainWindow();
 private slots:
     void on_pushButtonAdd_clicked();
     void on_pushButtonDel_clicked();
 private:
     bool isFailAddFile();
     bool createFile();
     void fileFilter();
 private:
     Ui::MainWindow *ui;
     QDir *m_tempDir;
     QString m_dirString;
     QCompleter *m_completer;
 };
 #endif // MAINWINDOW_H

②、源文件：

#include "mainwindow.h"
 #include "ui_mainwindow.h"
 MainWindow::MainWindow(QWidget *parent) :
     QMainWindow(parent),
     ui(new Ui::MainWindow)
 {
     ui->setupUi(this);
     this->setFixedSize(485,90);
     m_dirString = "CreatePddOrPff";
     m_tempDir = new QDir;
     m_tempDir->mkdir(m_dirString);
     fileFilter();
 }
 MainWindow::~MainWindow()
 {
     delete ui;
     delete m_tempDir;
 }
 void MainWindow::on_pushButtonAdd_clicked()
 {
     if(createFile()){
         QMessageBox::information(this,"Success","File is creating.");
     }
 }
 void MainWindow::on_pushButtonDel_clicked()
 {
     if(QFile::remove(QString(m_dirString).append("/").append(ui->lineEditDel->text()))){
         QMessageBox::information(this,"Success","File is removing.");
         ui->lineEditDel->setText("");
     }
     else{
         QMessageBox::information(this,"Fail","File is not exists.");
     }
 }
 bool MainWindow::isFailAddFile()
 {
     if(ui->lineEditAdd->text().isEmpty()){
         QMessageBox::information(this,"Fail","File is Empty.");
     }
     return !ui->lineEditAdd->text().isEmpty();
 }
 bool MainWindow::createFile()
 {
     QFile file(QString(m_dirString).append("/").append(ui->lineEditAdd->text()).append(".").append(ui->comboBox->currentText()));
     if(isFailAddFile()){
         file.open(QIODevice::WriteOnly);
         file.close();
         fileFilter();
     }
     return file.exists();
 }
 void MainWindow::fileFilter()
 {
     QStringList filter;
     QDir dir(m_dirString);
     dir.setFilter(QDir::Files|QDir::Hidden|QDir::NoSymLinks);
     filter << "*.p*";
     m_tempDir->setNameFilters(filter);
     QFileInfoList infoList = dir.entryInfoList();
     for(int i = 0; i < infoList.count(); i++){
         filter.append(infoList.at(i).fileName());
     }
     m_completer = new QCompleter(filter,this);
     m_completer->setCaseSensitivity(Qt::CaseInsensitive);
     ui->lineEditDel->setCompleter(m_completer);
 }

③、ui文件：