qt 5.x 学习笔记 (2)
先来放一波过程中用到的资料和官方文档好了。
Standard Dialogs Example qt 5.8
更新的部分还是放在最前面好了。。。
convert from QString to char *的时候有个坑。。。
In order to convert a QString to a char*, then you first need to get a latin1 representation of the string by calling toLatin1() on it which will return a QByteArray. Then call data() on the QByteArray to get a pointer to the data stored in the byte array. See the documentation: See the following example for a demonstration:
举个栗子。。。。
int main(int argc, char **argv)
{
QApplication app(argc, argv);
QString str1 = "Test";
QByteArray ba = str1.toLatin1();
const char *c_str2 = ba.data();
printf("str2: %s", c_str2);
return app.exec();
}
**Note that it is necessary to store the bytearray before you call data() on it, a call like the following const char *c_str2 = str2.toLatin1().data(); will make the application crash as the QByteArray has not been stored and hence no longer exists.**
目前基本框架出来了。。。
可以打开一个文件。。加密。。保存。。。
加密算法部分暂时用倒序输出代替。。。
界面布局还没搞。。。一些提示之类的还没搞。。。。。。。。
接下来要做的。。。大概就是把des写进去了。。。
放一波代码好了。。。
/****************************************************************************
**
** Copyright (C) 2016 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of the examples of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:BSD$
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and The Qt Company. For licensing terms
** and conditions see https://www.qt.io/terms-conditions. For further
** information use the contact form at https://www.qt.io/contact-us.
**
** BSD License Usage
** Alternatively, you may use this file under the terms of the BSD license
** as follows:
**
** "Redistribution and use in source and binary forms, with or without
** modification, are permitted provided that the following conditions are
** met:
** * Redistributions of source code must retain the above copyright
** notice, this list of conditions and the following disclaimer.
** * Redistributions in binary form must reproduce the above copyright
** notice, this list of conditions and the following disclaimer in
** the documentation and/or other materials provided with the
** distribution.
** * Neither the name of The Qt Company Ltd nor the names of its
** contributors may be used to endorse or promote products derived
** from this software without specific prior written permission.
**
**
** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
**
** $QT_END_LICENSE$
**
****************************************************************************/
#ifndef DIALOG_H
#define DIALOG_H
#include <QWidget>
#include <QTextEdit>
class QCheckBox;
class QLabel;
class QErrorMessage;
class DialogOptionsWidget;
class Dialog : public QWidget
{
Q_OBJECT
public:
Dialog(QWidget *parent = 0);
private slots:
void setText();
void setOpenFileName();
void beginToCal();
void setSaveFileName();
void criticalMessage();
void informationMessage();
void questionMessage();
void warningMessage();
void errorMessage();
private:
QLabel *textLabel;
QLabel *openFileNameLabel;
QLabel *saveFileNameLabel;
QLabel *criticalLabel;
QLabel *informationLabel;
QLabel *questionLabel;
QLabel *warningLabel;
QLabel *errorLabel;
QErrorMessage *errorMessageDialog;
DialogOptionsWidget *fileDialogOptionsWidget;
DialogOptionsWidget *colorDialogOptionsWidget;
DialogOptionsWidget *fontDialogOptionsWidget;
QString openFilesPath;
QTextEdit *textEdit;
QString QTextSt;
};
#endif
/****************************************************************************
**
** Copyright (C) 2016 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of the examples of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:BSD$
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and The Qt Company. For licensing terms
** and conditions see https://www.qt.io/terms-conditions. For further
** information use the contact form at https://www.qt.io/contact-us.
**
** BSD License Usage
** Alternatively, you may use this file under the terms of the BSD license
** as follows:
**
** "Redistribution and use in source and binary forms, with or without
** modification, are permitted provided that the following conditions are
** met:
** * Redistributions of source code must retain the above copyright
** notice, this list of conditions and the following disclaimer.
** * Redistributions in binary form must reproduce the above copyright
** notice, this list of conditions and the following disclaimer in
** the documentation and/or other materials provided with the
** distribution.
** * Neither the name of The Qt Company Ltd nor the names of its
** contributors may be used to endorse or promote products derived
** from this software without specific prior written permission.
**
**
** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
**
** $QT_END_LICENSE$
**
****************************************************************************/
#include <QtWidgets>
#include <QTextEdit>
#include "dialog.h"
#define MESSAGE \
Dialog::tr("<p>Message boxes have a caption, a text, " \
"and any number of buttons, each with standard or custom texts." \
"<p>Click a button to close the message box. Pressing the Esc button " \
"will activate the detected escape button (if any).")
#define MESSAGE_DETAILS \
Dialog::tr("If a message box has detailed text, the user can reveal it " \
"by pressing the Show Details... button.")
class DialogOptionsWidget : public QGroupBox
{
public:
explicit DialogOptionsWidget(QWidget *parent = 0);
void addCheckBox(const QString &text, int value);
void addSpacer();
int value() const;
private:
typedef QPair<QCheckBox *, int> CheckBoxEntry;
QVBoxLayout *layout;
QList<CheckBoxEntry> checkBoxEntries;
};
DialogOptionsWidget::DialogOptionsWidget(QWidget *parent) :
QGroupBox(parent) , layout(new QVBoxLayout)
{
//setTitle(Dialog::tr("Optionsssss"));
// textEdit = new QTextEdit(this);
//setCentralWidget(textEdit);
//textEdit = new QTextEdit(this);
//setCentralWidget(textEdit);
// setLayout(layout);
}
void DialogOptionsWidget::addCheckBox(const QString &text, int value)
{
QCheckBox *checkBox = new QCheckBox(text);
layout->addWidget(checkBox);
checkBoxEntries.append(CheckBoxEntry(checkBox, value));
}
void DialogOptionsWidget::addSpacer()
{
layout->addItem(new QSpacerItem(0, 0, QSizePolicy::Ignored, QSizePolicy::MinimumExpanding));
}
int DialogOptionsWidget::value() const
{
int result = 0;
foreach (const CheckBoxEntry &checkboxEntry, checkBoxEntries)
if (checkboxEntry.first->isChecked())
result |= checkboxEntry.second;
return result;
}
Dialog::Dialog(QWidget *parent)
: QWidget(parent)
{
QVBoxLayout *verticalLayout;
if (QGuiApplication::styleHints()->showIsFullScreen() || QGuiApplication::styleHints()->showIsMaximized()) {
QHBoxLayout *horizontalLayout = new QHBoxLayout(this);
QGroupBox *groupBox = new QGroupBox(QGuiApplication::applicationDisplayName(), this);
horizontalLayout->addWidget(groupBox);
verticalLayout = new QVBoxLayout(groupBox);
} else {
verticalLayout = new QVBoxLayout(this);
}
QToolBox *toolbox = new QToolBox;
verticalLayout->addWidget(toolbox);
errorMessageDialog = new QErrorMessage(this);
int frameStyle = QFrame::Sunken | QFrame::Panel;
textLabel = new QLabel;
textLabel->setFrameStyle(frameStyle);
QPushButton *textButton = new QPushButton(tr("加密文件"));
openFileNameLabel = new QLabel;
openFileNameLabel->setFrameStyle(frameStyle);
QPushButton *openFileNameButton =
new QPushButton(tr("打开文件"));
QPushButton *calButton =
new QPushButton(tr("加密"));
saveFileNameLabel = new QLabel;
saveFileNameLabel->setFrameStyle(frameStyle);
QPushButton *saveFileNameButton =
new QPushButton(tr("QFileDialog::get&SaveFileName()"));
criticalLabel = new QLabel;
criticalLabel->setFrameStyle(frameStyle);
QPushButton *criticalButton =
new QPushButton(tr("QMessageBox::critica&l()"));
informationLabel = new QLabel;
informationLabel->setFrameStyle(frameStyle);
QPushButton *informationButton =
new QPushButton(tr("QMessageBox::i&nformation()"));
questionLabel = new QLabel;
questionLabel->setFrameStyle(frameStyle);
QPushButton *questionButton =
new QPushButton(tr("QMessageBox::&question()"));
warningLabel = new QLabel;
warningLabel->setFrameStyle(frameStyle);
QPushButton *warningButton = new QPushButton(tr("QMessageBox::&warning()"));
errorLabel = new QLabel;
errorLabel->setFrameStyle(frameStyle);
QPushButton *errorButton =
new QPushButton(tr("QErrorMessage::showM&essage()"));
connect(textButton, &QAbstractButton::clicked, this, &Dialog::setText);
connect(openFileNameButton, &QAbstractButton::clicked,
this, &Dialog::setOpenFileName);
connect(calButton,&QAbstractButton::clicked,
this,&Dialog::beginToCal);
connect(saveFileNameButton, &QAbstractButton::clicked,
this, &Dialog::setSaveFileName);
connect(criticalButton, &QAbstractButton::clicked, this, &Dialog::criticalMessage);
connect(informationButton, &QAbstractButton::clicked,
this, &Dialog::informationMessage);
connect(questionButton, &QAbstractButton::clicked, this, &Dialog::questionMessage);
connect(warningButton, &QAbstractButton::clicked, this, &Dialog::warningMessage);
connect(errorButton, &QAbstractButton::clicked, this, &Dialog::errorMessage);
QWidget *page = new QWidget;
QGridLayout *layout = new QGridLayout(page);
layout->setColumnStretch(1, 1);
layout->setColumnMinimumWidth(1, 250);
layout->addWidget(textButton, 3, 0);
layout->addWidget(textLabel, 3, 1);
layout->addItem(new QSpacerItem(0, 0, QSizePolicy::Ignored, QSizePolicy::MinimumExpanding), 5, 0);
toolbox->addItem(page, tr("Input Dialogs"));
const QString doNotUseNativeDialog = tr("Do not use native dialog");
page = new QWidget;
layout = new QGridLayout(page);
layout->setColumnStretch(1, 1);
/* colorDialogOptionsWidget = new DialogOptionsWidget;
colorDialogOptionsWidget->addCheckBox(doNotUseNativeDialog, QColorDialog::DontUseNativeDialog);
colorDialogOptionsWidget->addCheckBox(tr("Show alpha channel") , QColorDialog::ShowAlphaChannel);
colorDialogOptionsWidget->addCheckBox(tr("No buttons") , QColorDialog::NoButtons);
layout->addItem(new QSpacerItem(0, 0, QSizePolicy::Ignored, QSizePolicy::MinimumExpanding), 1, 0);
layout->addWidget(colorDialogOptionsWidget, 2, 0, 1 ,2);
toolbox->addItem(page, tr("Color Dialog"));
*/
// page = new QWidget;
// layout = new QGridLayout(page);
// layout->setColumnStretch(1, 1);
// layout->addWidget(fontButton, 0, 0);
//layout->addWidget(fontLabel, 0, 1);
page = new QWidget;
layout = new QGridLayout(page);
layout->setColumnStretch(3,1);
layout->addWidget(openFileNameButton, 1, 0);
layout->addWidget(openFileNameLabel, 1,1);
layout->addWidget(calButton,1,2);
layout->addWidget(saveFileNameButton, 3, 0);
layout->addWidget(saveFileNameLabel, 3, 1);
fileDialogOptionsWidget = new DialogOptionsWidget;
layout->addItem(new QSpacerItem(0, 0, QSizePolicy::Ignored, QSizePolicy::MinimumExpanding), 4, 0);
toolbox->addItem(page, tr("File Dialogs"));
page = new QWidget;
layout = new QGridLayout(page);
layout->setColumnStretch(1, 1);
layout->addWidget(criticalButton, 0, 0);
layout->addWidget(criticalLabel, 0, 1);
layout->addWidget(informationButton, 1, 0);
layout->addWidget(informationLabel, 1, 1);
layout->addWidget(questionButton, 2, 0);
layout->addWidget(questionLabel, 2, 1);
layout->addWidget(warningButton, 3, 0);
layout->addWidget(warningLabel, 3, 1);
layout->addWidget(errorButton, 4, 0);
layout->addWidget(errorLabel, 4, 1);
layout->addItem(new QSpacerItem(0, 0, QSizePolicy::Ignored, QSizePolicy::MinimumExpanding), 5, 0);
toolbox->addItem(page, tr("Message Boxes"));
setWindowTitle(QGuiApplication::applicationDisplayName());
}
void Dialog::setText()
{
bool ok;
QString text = QInputDialog::getText(this, tr("QInputDialog::getText()"),
tr("User name:"), QLineEdit::Normal,
QDir::home().dirName(), &ok);
if (ok && !text.isEmpty())
textLabel->setText(text);
}
void Dialog::setOpenFileName()
{
const QFileDialog::Options options = QFlag(fileDialogOptionsWidget->value());
QString selectedFilter;
QString fileName = QFileDialog::getOpenFileName(this,
tr("QFileDialog::getOpenFileName()"),
openFileNameLabel->text(),
tr("All Files (*);;Text Files (*.txt)"),
&selectedFilter,
options);
if (!fileName.isEmpty())
{
openFileNameLabel->setText(fileName);
qDebug()<<"filename:"<<fileName;
QFile file(fileName);
//不仅仅是if判断。。重点是执行了open操作。。。顺便返回值罢了。。kk最菜.jpg
if (!file.open(QIODevice::ReadOnly | QIODevice::Text)) {
QMessageBox::warning(this, tr("Read File"),
tr("Cannot open file:\n%1").arg(fileName));
return;
}
QTextStream in(&file);
QTextSt = in.readAll();
qDebug()<<"fileText:"<<QTextSt<<endl;
qDebug()<<"TextLen:"<<QTextSt.length();
file.close();
}
}
void Dialog::beginToCal()
{
int len = QTextSt.length();
QString ret = "";
for ( int i = len-1 ; i >=0 ; i--)
{
QChar tmp = QTextSt[i];
ret+=tmp;
}
QTextSt = ret;
}
void Dialog::setSaveFileName()
{
const QFileDialog::Options options = QFlag(fileDialogOptionsWidget->value());
QString selectedFilter;
QString fileName = QFileDialog::getSaveFileName(this,
tr("QFileDialog::getSaveFileName()"),
saveFileNameLabel->text(),
tr("All Files (*);;Text Files (*.txt)"),
&selectedFilter,
options);
if (!fileName.isEmpty())
{
saveFileNameLabel->setText(fileName);
QFile file(fileName);
if (!file.open(QIODevice::WriteOnly | QIODevice::Text)) {
QMessageBox::warning(this, tr("Write File"),
tr("Cannot open file:\n%1").arg(fileName));
return;
}
QTextStream out(&file);
qDebug()<<"save file text:"<<QTextSt<<endl;
//out << textEdit->toPlainText();
out<<QTextSt<<endl;
file.close();
}
}
void Dialog::criticalMessage()
{
QMessageBox::StandardButton reply;
reply = QMessageBox::critical(this, tr("QMessageBox::critical()"),
MESSAGE,
QMessageBox::Abort | QMessageBox::Retry | QMessageBox::Ignore);
if (reply == QMessageBox::Abort)
criticalLabel->setText(tr("Abort"));
else if (reply == QMessageBox::Retry)
criticalLabel->setText(tr("Retry"));
else
criticalLabel->setText(tr("Ignore"));
}
void Dialog::informationMessage()
{
QMessageBox::StandardButton reply;
reply = QMessageBox::information(this, tr("QMessageBox::information()"), MESSAGE);
if (reply == QMessageBox::Ok)
informationLabel->setText(tr("OK"));
else
informationLabel->setText(tr("Escape"));
}
void Dialog::questionMessage()
{
QMessageBox::StandardButton reply;
reply = QMessageBox::question(this, tr("QMessageBox::question()"),
MESSAGE,
QMessageBox::Yes | QMessageBox::No | QMessageBox::Cancel);
if (reply == QMessageBox::Yes)
questionLabel->setText(tr("Yes"));
else if (reply == QMessageBox::No)
questionLabel->setText(tr("No"));
else
questionLabel->setText(tr("Cancel"));
}
void Dialog::warningMessage()
{
QMessageBox msgBox(QMessageBox::Warning, tr("QMessageBox::warning()"),
MESSAGE, 0, this);
msgBox.setDetailedText(MESSAGE_DETAILS);
msgBox.addButton(tr("Save &Again"), QMessageBox::AcceptRole);
msgBox.addButton(tr("&Continue"), QMessageBox::RejectRole);
if (msgBox.exec() == QMessageBox::AcceptRole)
warningLabel->setText(tr("Save Again"));
else
warningLabel->setText(tr("Continue"));
}
void Dialog::errorMessage()
{
errorMessageDialog->showMessage(
tr("This dialog shows and remembers error messages. "
"If the checkbox is checked (as it is by default), "
"the shown message will be shown again, "
"but if the user unchecks the box the message "
"will not appear again if QErrorMessage::showMessage() "
"is called with the same message."));
errorLabel->setText(tr("If the box is unchecked, the message "
"won't appear again."));
}
/****************************************************************************
**
** Copyright (C) 2016 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of the examples of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:BSD$
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and The Qt Company. For licensing terms
** and conditions see https://www.qt.io/terms-conditions. For further
** information use the contact form at https://www.qt.io/contact-us.
**
** BSD License Usage
** Alternatively, you may use this file under the terms of the BSD license
** as follows:
**
** "Redistribution and use in source and binary forms, with or without
** modification, are permitted provided that the following conditions are
** met:
** * Redistributions of source code must retain the above copyright
** notice, this list of conditions and the following disclaimer.
** * Redistributions in binary form must reproduce the above copyright
** notice, this list of conditions and the following disclaimer in
** the documentation and/or other materials provided with the
** distribution.
** * Neither the name of The Qt Company Ltd nor the names of its
** contributors may be used to endorse or promote products derived
** from this software without specific prior written permission.
**
**
** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
**
** $QT_END_LICENSE$
**
****************************************************************************/
#include <QApplication>
#include <QStyleHints>
#include <QDesktopWidget>
#include <QTranslator>
#include <QLocale>
#include <QLibraryInfo>
#include "dialog.h"
int main(int argc, char *argv[])
{
QApplication app(argc, argv);
QGuiApplication::setApplicationDisplayName(Dialog::tr("Standard Dialogs"));
#ifndef QT_NO_TRANSLATION
QString translatorFileName = QLatin1String("qt_");
translatorFileName += QLocale::system().name();
QTranslator *translator = new QTranslator(&app);
if (translator->load(translatorFileName, QLibraryInfo::location(QLibraryInfo::TranslationsPath)))
app.installTranslator(translator);
#endif
Dialog dialog;
if (!QGuiApplication::styleHints()->showIsFullScreen() && !QGuiApplication::styleHints()->showIsMaximized()) {
const QRect availableGeometry = QApplication::desktop()->availableGeometry(&dialog);
dialog.resize(availableGeometry.width() * 4 / 5, availableGeometry.height() * 2 / 3);
dialog.move((availableGeometry.width() - dialog.width()) / 2,
(availableGeometry.height() - dialog.height()) / 2);
}
dialog.show();
return app.exec();
}
记录一些坑？（其实也不算坑。。。
目前我的做法是有一个全局的QString。。。
我是打算直接拆分包装这个QString。。。每8位。。。
然后QString的[] operator得到的是QCharRef类型。。。。
QString之前有的toAscii()被移除了。。。。
qt 5.2以后的方法叫:toLatin1()