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| ** Copyright (C) 2019 The Qt Company Ltd. |
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| ** This file is part of the examples of the Qt Toolkit. |
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| ****************************************************************************/ |
| #include <QtWidgets/QtWidgets> |
| |
| int main(int argc, char **argv) |
| { |
| QApplication app(argc, argv); |
| |
| QByteArray content; |
| |
| QWidget loadFileUi; |
| QVBoxLayout *layout = new QVBoxLayout(); |
| QPushButton *loadFile = new QPushButton("Load File"); |
| QLabel *fileInfo = new QLabel("Opened file:"); |
| fileInfo->setTextInteractionFlags(Qt::TextSelectableByMouse); |
| QLabel *fileHash = new QLabel("Sha256:"); |
| fileHash->setTextInteractionFlags(Qt::TextSelectableByMouse); |
| QPushButton *saveFile = new QPushButton("Save File"); |
| saveFile->setEnabled(false); |
| |
| auto onFileReady = [=, &content](const QString &fileName, const QByteArray &fileContents) { |
| content = fileContents; |
| fileInfo->setText(QString("Opened file: %1 size: %2").arg(fileName).arg(fileContents.size())); |
| saveFile->setEnabled(true); |
| |
| auto computeDisplayFileHash = [=](){ |
| QByteArray hash = QCryptographicHash::hash(fileContents, QCryptographicHash::Sha256); |
| fileHash->setText(QString("Sha256: %1").arg(QString(hash.toHex()))); |
| }; |
| |
| QTimer::singleShot(100, computeDisplayFileHash); // update UI before computing hash |
| }; |
| auto onLoadClicked = [=](){ |
| QFileDialog::getOpenFileContent("*.*", onFileReady); |
| }; |
| QObject::connect(loadFile, &QPushButton::clicked, onLoadClicked); |
| |
| auto onSaveClicked = [=, &content]() { |
| QFileDialog::saveFileContent(content, "qtsavefiletest.dat"); |
| }; |
| QObject::connect(saveFile, &QPushButton::clicked, onSaveClicked); |
| |
| layout->addWidget(loadFile); |
| layout->addWidget(fileInfo); |
| layout->addWidget(fileHash); |
| layout->addWidget(saveFile); |
| layout->addStretch(); |
| |
| loadFileUi.setLayout(layout); |
| loadFileUi.show(); |
| |
| return app.exec(); |
| } |