Qt學習: QFileDialog和QMessageBox的用法和程序示例
阿新 • • 發佈：2017-10-07
window 軟件 編程 計算機 qt
*QMessageBox的用法:
members: 1.void setStandardButtons(QMessageBox::); //設置按鈕.
2.void setText(QString); //設置內容.
3.void setInformativeText(QString); //設置重要內容.位於對話框底部的位置.按鈕之上.
4.void setIconPixmap(QPixmap); //設置圖片.可以自定義的.
5.void setDefaultButton(QMessageBox::); //設置默認被選中的按鈕.
6.void setIcon(QMessageBox::Icon); //設置圖標.默認5個選一個.
7.void setButtonText(QMessageBox::, QString); //給按鈕重未名.
8.void setDetailedText(QString); //設置詳細框內容.
9.void setCheckBox(QCheckBox*); //加入一個QCheckBox的對象.1234567891011QFileDialog的用法:
QFileDialog::AcceptOpen. //打開文件，默認的.
QFileDialog::AcceptSave. //保存文件.
members: 1.void setAcceptMode(QFileDialog::); //設置對話框的模式.
2.int exec(); //返回選擇的狀態.
3.void setDefaultSuffix(QString); //設置默認後綴.
4.void setDirectory(QString); //設置路徑.
5.QString getOpenFileName(); //獲得打開的文件的名字.
6.QString getSaveFileName(); //獲得保存的文件的名字.
7.QStringList selectedFiles(); //返回被選中的文件名.
8.void setNameFilter(QString); //設置過濾器.12345678910先從Qt設計師中拖拽出所需要的布局和更改對象名:
以下是”c.cpp”內的代碼:
#include "c.h"c::c(QWidget *parent)
: QMainWindow(parent)
{
ui.setupUi(this);
ui.openFileButton->setText(QString::fromLocal8Bit("打開文件"));
ui.saveFileButton->setText(QString::fromLocal8Bit("保存文件"));
ui.messageButton->setText(QString::fromLocal8Bit("完全版對話框"));
ui.messageButton_2->setText(QString::fromLocal8Bit("顯示六種快捷調用"));
connect(ui.openFileButton, SIGNAL(clicked()), this, SLOT(openFileDialogSlot()));
connect(ui.saveFileButton, SIGNAL(clicked()), this, SLOT(saveFileDialogSlot()));
connect(ui.messageButton, SIGNAL(clicked()), this, SLOT(printValidatorDialogSlot()));
connect(ui.messageButton_2, SIGNAL(clicked()), this, SLOT(showAllDialogSlot()));
}
c::~c()
{
}void c::openFileDialogSlot()
{ //方法1:
//定義一個QFileDialog的對象.
QFileDialog temp(this); //設置它的標題.
temp.setWindowTitle("open file"); //設置它的模式為打開文件模式.
temp.setAcceptMode(QFileDialog::AcceptOpen); //設置打開的路徑.
temp.setDirectory("c:/users/administrator/desktop"); //設置過濾器.
temp.setNameFilter(QString::fromLocal8Bit("文本文檔(*.txt);;所有文件(*.*)")); //判斷是否成功打開一個文件.
if (temp.exec() == QDialog::Accepted)
{ //返回打開文件的絕對路徑.
QString path = temp.selectedFiles().at(0); //連接文件，並且打開文件.
QFile *file = new QFile(path); bool ok = file->open(QIODevice::ReadOnly); //如果成功打開文件的話...進行以下操作.
if (ok)
{
QTextStream s(file); //....文件已經打開，接下來可以從打開的文件內讀取字符流.
}
} //方法2:
//獲取打開的文件的絕對路徑.
QString path = QFileDialog::getOpenFileName(this, "open file", "c:/users/administrator/desktop", QString::fromLocal8Bit("文本文檔(*.txt);;所有文件(*.*)")); //如果路徑不會空，則視為成功打開文件.如果路徑為空，則視為未選擇打開文件，可能點擊取消.
if (!path.isEmpty())
{
QFile *file = new QFile(path); bool ok = file->open(QIODevice::ReadOnly); if (ok)
{
QTextStream s(file); //....文件已經打開，接下來可以從打開的文件內讀取字符流.
}
}
}void c::saveFileDialogSlot()
{ //方法1:
QFileDialog temp(this);
temp.setWindowTitle("save file");
temp.setAcceptMode(QFileDialog::AcceptSave);
temp.setDirectory("c:/users/administrator/desktop");
temp.setNameFilter(QString::fromLocal8Bit("文本文檔(*.txt);;所有文件(*.*)")); //設置默認添加後綴".txt".
temp.setDefaultSuffix(".txt"); if (temp.exec() == QDialog::Accepted)
{
QString path = temp.selectedFiles().at(0);
QFile *file = new QFile(path); bool ok = file->open(QIODevice::WriteOnly); if (ok)
{
QTextStream s(file); //....文件已經打開，接下來向文件內寫入字符流.
}
} //方法2:
QString path = QFileDialog::getOpenFileName(this, "save file", "c:/users/administrator/desktop", QString::fromLocal8Bit("文本文檔(*.txt);;所有文件(*.*)")); if (!path.isEmpty())
{
QFile *file = new QFile(path); bool ok = file->open(QIODevice::ReadOnly); if (ok)
{
QTextStream s(file); //....文件已經打開，接下來向文件內寫入字符流.
}
}
}void c::printValidatorDialogSlot()
{
QCheckBox *s = new QCheckBox;
s->setText(QString::fromLocal8Bit("你是否喜歡Qt"));
QMessageBox temp;
temp.setStandardButtons(QMessageBox::Ok | QMessageBox::No | QMessageBox::Cancel);
temp.setWindowTitle(QString::fromLocal8Bit("輸入情況"));
temp.setText(QString::fromLocal8Bit("顯示對話框"));
temp.setCheckBox(s);
temp.setDetailedText(QString::fromLocal8Bit("這是一個用來提醒用戶是否輸入正確的對話框!"));
temp.setButtonText(QMessageBox::Ok, QString::fromLocal8Bit("確定"));
temp.setButtonText(QMessageBox::No, QString::fromLocal8Bit("不確定"));
temp.setButtonText(QMessageBox::Cancel, QString::fromLocal8Bit("取消"));
temp.setIconPixmap(QPixmap("1.png").scaled(100, 100));
temp.setDefaultButton(QMessageBox::No);
temp.setInformativeText(QString::fromLocal8Bit("輸入正確!"));
temp.exec();
}void c::showAllDialogSlot()
{
QMessageBox::aboutQt(this, "aboutQt");
QMessageBox::about(this, "about", "about");
QMessageBox::information(this, "information", "information");
QMessageBox::warning(this, "warning", "warning");
QMessageBox::question(this, "question", "question");
QMessageBox::critical(this, "critical", "critical");
}123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128以下是”c.h”下的代碼:
#ifndef C_H#define C_H#include <QtWidgets/QMainWindow>#include "ui_c.h"#include <QPushButton>#include <QFileDialog>#include <QMessageBox>#include <QTextStream>#include <QFile>#include <QCheckBox>class c : public QMainWindow{
Q_OBJECTpublic:
c(QWidget *parent = 0);
~c();private slots: void openFileDialogSlot(); void saveFileDialogSlot(); void printValidatorDialogSlot(); void showAllDialogSlot();private:
Ui::cClass ui;
};#endif // C_H1234567891011121314151617181920212223242526272829303132最後是”main.cpp”內的代碼:
#include "c.h"#include <QtWidgets/QApplication>int main(int argc, char *argv[])
{
QApplication a(argc, argv);
c w;
w.show(); return a.exec();
}1234567891011註:本博客所有代碼全部經過實際測試，成功編譯運行後才發出來.
Qt學習: QFileDialog和QMessageBox的用法和程序示例