Qt学习之路之获取文件信息

「爱情、让人受尽委屈。」 2022-08-06 08:27 282阅读 0赞

**QFileInfo类提供了对文件进行操作时获取的文件信息，包括文件名， 文件大小(字节)， 文件创建时间，**

**文件最后修改时间，文件最近访问时间以及一些文件是否为目录，文件，或者符号连接，和读写等属性。**

**不废话了，先看看代码~~~~**

**fileInfo\_widget.h**

#ifndef FILEWIDGET_H
    #define FILEWIDGET_H
    
    #include <QWidget>
    #include <QLabel>
    #include <QTextCodec>	//---j解决中文乱码
    #include <QPushButton>
    #include <QCheckBox>
    #include <QLineEdit>
    #include <QHBoxLayout>
    #include <QVBoxLayout>
    #include <QFileDialog>
    #include <QGridLayout>
    #include <QDateTime>
    
    class FileInfoWidget : public QWidget
    {
    	Q_OBJECT
    public:
    	FileInfoWidget(QWidget *parent=0);
    	 
    	public slots:
    		void slotFile();		//-----通过标准文件对话框获取文件名功能
    		void slotGetInfo();	//-----获取文件的具体信息
    private:
    	QLabel *fileNameLabel;
    	QLineEdit *fileNameEdit;
    	QPushButton *openFileBtn;
    	QPushButton *GetFileInfoBtn;
    
    	QLabel *sizeLabel;							//---大小
    	QLineEdit *sizeLabelEdit;
    
    	QLabel *buildTimeLabel;					//--创建时间
    	QLineEdit *buildTimeEdit;
    
    	QLabel *lastModifiedTimeLabel;		//---最近修改时间
    	QLineEdit *lastModifiedEdit;
    
    	QLabel *lastVisitLabel;					//--最后访问时间
    	QLineEdit *lastVisitEidt;
    
    	QLabel *propertyLabel;						//--属性
    	QCheckBox *isDirCheckBox;				//--目录
    	QCheckBox *isFileCheckBox;				//--文件
    	QCheckBox *isSymbolLinkCheckBox;	//--符号连接
    	QCheckBox *isHiddenCheckBox;			//--隐藏
    	QCheckBox *isReadableCheckBox;		//--读
    	QCheckBox *isWriteableCheckBox;		//--写
    	QCheckBox *isExecutableCheckBox;		//-执行
    };
    
    #endif	//FILEWIDGET_H

**fileInfo\_widget.cpp**

#include "fileInfo_widget.h"
    
    FileInfoWidget::FileInfoWidget(QWidget *parent/*=0*/):QWidget(parent)
    {
    	//----Qt5解决中文乱码
    	QTextCodec *codec = QTextCodec::codecForName("GB18030");
    
    	//-----------------------------------
    	fileNameLabel = new QLabel(codec->toUnicode("文件名"));
    	fileNameEdit = new QLineEdit();
    	openFileBtn = new QPushButton(codec->toUnicode("文件"));
    
    	sizeLabel = new QLabel(codec->toUnicode("大小"));
    	sizeLabelEdit = new QLineEdit();
    
    	buildTimeLabel = new QLabel(codec->toUnicode("创建时间"));
    	buildTimeEdit = new QLineEdit();
    
    	lastModifiedTimeLabel = new QLabel(codec->toUnicode("最后修改时间"));
    	lastModifiedEdit = new QLineEdit();
    
    	lastVisitLabel = new QLabel(codec->toUnicode("最近访问时间"));
    	lastVisitEidt = new QLineEdit();
    
    	propertyLabel = new QLabel(codec->toUnicode("属性"));
    
    	isDirCheckBox = new QCheckBox(codec->toUnicode("目录"));
    	isFileCheckBox = new QCheckBox(codec->toUnicode("文件"));
    	isSymbolLinkCheckBox = new QCheckBox(codec->toUnicode("符号连接"));
    	isHiddenCheckBox = new QCheckBox(codec->toUnicode("隐藏"));
    	isReadableCheckBox = new QCheckBox(codec->toUnicode("读"));
    	isWriteableCheckBox = new QCheckBox(codec->toUnicode("写"));
    	isExecutableCheckBox = new QCheckBox(codec->toUnicode("执行"));
    
    	GetFileInfoBtn = new QPushButton(codec->toUnicode("获取文件信息"));
    
    	//------布局控件
    	QGridLayout *gridLayout = new QGridLayout();
    	gridLayout->addWidget(fileNameLabel, 0, 0);
    	gridLayout->addWidget(fileNameEdit, 0, 1);
    	gridLayout->addWidget(openFileBtn, 0, 2);
    
    	gridLayout->addWidget(sizeLabel, 1, 0);
    	gridLayout->addWidget(sizeLabelEdit, 1, 1, 1, 2);
    
    	gridLayout->addWidget(buildTimeLabel,  2, 0);
    	gridLayout->addWidget(buildTimeEdit, 2, 1, 1, 2);
    
    	gridLayout->addWidget(lastVisitLabel, 3, 0);
    	gridLayout->addWidget(lastVisitEidt, 3, 1, 1, 2);
    
    	gridLayout->addWidget(lastVisitLabel, 4, 0);
    	gridLayout->addWidget(lastVisitEidt, 4, 1, 1, 2);
    
    	QHBoxLayout *hLayout1 = new QHBoxLayout();
    	hLayout1->addWidget(propertyLabel);
    	hLayout1->addStretch();
    
    	QHBoxLayout *hLayout2 = new QHBoxLayout();
    	hLayout2->addWidget(isDirCheckBox);
    	hLayout2->addWidget(isFileCheckBox);
    	hLayout2->addWidget(isHiddenCheckBox);
    	hLayout2->addWidget(isSymbolLinkCheckBox);
    	hLayout2->addWidget(isReadableCheckBox);
    	hLayout2->addWidget(isWriteableCheckBox);
    	hLayout2->addWidget(isExecutableCheckBox);
    
    	QHBoxLayout *hLayout3 = new QHBoxLayout();
    	hLayout3->addWidget(GetFileInfoBtn);
    
    	QVBoxLayout *vLayout = new QVBoxLayout(this);
    	vLayout->addLayout(gridLayout);
    	vLayout->addLayout(hLayout1);
    	vLayout->addLayout(hLayout2);
    	vLayout->addLayout(hLayout3);
    
    	//---显示布局
    	setLayout(vLayout);
    
    	//-----设置信号与槽
    	connect(openFileBtn, SIGNAL(clicked()), this, SLOT(slotFile()));
    	connect(GetFileInfoBtn, SIGNAL(clicked()), this, SLOT(slotGetInfo()));
    
    	//----设置窗口属性
    	setWindowTitle(codec->toUnicode("文件信息"));
    }
    
    //-----通过标准文件对话框获取文件名功能
    void FileInfoWidget::slotFile()
    {
    	//----Qt5解决中文乱码
    	QTextCodec *codec = QTextCodec::codecForName("GB18030");
    
    	QString fileNameStr = QFileDialog :: getOpenFileName	(this);
    	fileNameEdit->setText(fileNameStr);
    }
    
    //-----获取文件的具体信息
    void FileInfoWidget::slotGetInfo()
    {
    	//----Qt5解决中文乱码
    	QTextCodec *codec = QTextCodec::codecForName("GB18030");
    
    	//---获取文件名
    	QString fileStr = fileNameEdit->text();
    
    	QFileInfo fileInfo(fileStr);
    	//---获取文件大小（字节）
    	qint64 size = fileInfo.size();
    	//--获取文件创建时间
    	QDateTime buildTime = fileInfo.created();
    	//--获取文件最近修改时间
    	QDateTime lastMdTime = fileInfo.lastModified();
    	//---获取文件最近访问时间
    	QDateTime lastVisitTime = fileInfo.lastRead();
    
    	//--获取文件相关属性
    	bool isDir = fileInfo.isDir();
    	bool isFile = fileInfo.isFile();
    	bool isSymLink = fileInfo.isSymLink();
    	bool isHide = fileInfo.isHidden();
    	bool isRead = fileInfo.isReadable();
    	bool isWrite = fileInfo.isWritable();
    	bool isExecu = fileInfo.isExecutable();
    
    	//--显示属性
    	sizeLabelEdit->setText(QString :: number(size) + codec->toUnicode(" 字节"));
    	buildTimeEdit->setText(buildTime.toString());
    	lastModifiedEdit->setText(lastMdTime.toString());
    	lastVisitEidt->setText(lastVisitTime.toString());
    	
    	isDirCheckBox->setCheckState(isDir ? Qt::Checked : Qt :: Unchecked);
    	isFileCheckBox->setCheckState(isFile ? Qt::Checked : Qt :: Unchecked);
    	isSymbolLinkCheckBox->setCheckState(isSymLink ? Qt::Checked : Qt :: Unchecked);
    	isHiddenCheckBox->setCheckState(isHide ? Qt::Checked : Qt :: Unchecked);
    	isReadableCheckBox->setCheckState(isRead ? Qt::Checked : Qt :: Unchecked);
    	isWriteableCheckBox->setCheckState(isWrite ? Qt::Checked : Qt :: Unchecked);
    	isExecutableCheckBox->setCheckState(isExecu ? Qt::Checked : Qt :: Unchecked);
    }
    </span></strong>

**main.cpp**

#pragma once
    #include <QtWidgets/QApplication>
    #include "fileInfo_widget.h"
    
    int main(int argc, char *argv[])
    {
    	QApplication a(argc, argv);
    
    	FileInfoWidget win;
    	win.show();
    
    	return a.exec();
    }

**运行结果：**

**![Center][]**

**更多关于QFileInfo类的使用，请参考assistant。**

[Center]: /images/20220806/7d8051d504994b3aa1eee0b82a1f1b3a.png