dcbcda81b4
Testes file load and save, computes a sha256 hash for verifying file content. Change-Id: Id7f697c4dfd41e051442350f4050f04b493cfc18 Reviewed-by: Morten Johan Sørvig <morten.sorvig@qt.io>
101 lines
4.1 KiB
C++
101 lines
4.1 KiB
C++
/****************************************************************************
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**
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** Copyright (C) 2019 The Qt Company Ltd.
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** Contact: https://www.qt.io/licensing/
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**
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** This file is part of the examples of the Qt Toolkit.
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**
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** $QT_BEGIN_LICENSE:BSD$
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** Commercial License Usage
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** Licensees holding valid commercial Qt licenses may use this file in
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** accordance with the commercial license agreement provided with the
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** Software or, alternatively, in accordance with the terms contained in
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** a written agreement between you and The Qt Company. For licensing terms
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** and conditions see https://www.qt.io/terms-conditions. For further
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** information use the contact form at https://www.qt.io/contact-us.
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**
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** BSD License Usage
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** Alternatively, you may use this file under the terms of the BSD license
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** as follows:
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**
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** "Redistribution and use in source and binary forms, with or without
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** modification, are permitted provided that the following conditions are
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** met:
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** * Redistributions of source code must retain the above copyright
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** notice, this list of conditions and the following disclaimer.
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** * Redistributions in binary form must reproduce the above copyright
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** notice, this list of conditions and the following disclaimer in
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** the documentation and/or other materials provided with the
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** distribution.
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** * Neither the name of The Qt Company Ltd nor the names of its
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** contributors may be used to endorse or promote products derived
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** from this software without specific prior written permission.
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**
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**
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** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
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**
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** $QT_END_LICENSE$
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**
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****************************************************************************/
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#include <QtWidgets/QtWidgets>
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int main(int argc, char **argv)
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{
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QApplication app(argc, argv);
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QByteArray content;
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QWidget loadFileUi;
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QVBoxLayout *layout = new QVBoxLayout();
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QPushButton *loadFile = new QPushButton("Load File");
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QLabel *fileInfo = new QLabel("Opened file:");
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fileInfo->setTextInteractionFlags(Qt::TextSelectableByMouse);
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QLabel *fileHash = new QLabel("Sha256:");
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fileHash->setTextInteractionFlags(Qt::TextSelectableByMouse);
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QPushButton *saveFile = new QPushButton("Save File");
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saveFile->setEnabled(false);
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auto onFileReady = [=, &content](const QString &fileName, const QByteArray &fileContents) {
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content = fileContents;
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fileInfo->setText(QString("Opened file: %1 size: %2").arg(fileName).arg(fileContents.size()));
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saveFile->setEnabled(true);
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auto computeDisplayFileHash = [=](){
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QByteArray hash = QCryptographicHash::hash(fileContents, QCryptographicHash::Sha256);
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fileHash->setText(QString("Sha256: %1").arg(QString(hash.toHex())));
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};
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QTimer::singleShot(100, computeDisplayFileHash); // update UI before computing hash
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};
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auto onLoadClicked = [=](){
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QFileDialog::getOpenFileContent("*.*", onFileReady);
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};
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QObject::connect(loadFile, &QPushButton::clicked, onLoadClicked);
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auto onSaveClicked = [=, &content]() {
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QFileDialog::saveFileContent(content, "qtsavefiletest.dat");
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};
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QObject::connect(saveFile, &QPushButton::clicked, onSaveClicked);
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layout->addWidget(loadFile);
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layout->addWidget(fileInfo);
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layout->addWidget(fileHash);
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layout->addWidget(saveFile);
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layout->addStretch();
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loadFileUi.setLayout(layout);
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loadFileUi.show();
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return app.exec();
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}
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