黑莓OS10开发(2) 选择本地文件1

最新推荐文章于 2025-07-22 15:23:45 发布

原创最新推荐文章于 2025-07-22 15:23:45 发布 · 794 阅读

0 ·

CC 4.0 BY-SA版权

BlackBerry 专栏收录该内容

2 篇文章

订阅专栏

本文展示了如何使用Qt的文件选择器组件FilePicker进行文件选择和读写操作，包括设置文件类型、目录、标题及模式，以及关联信号槽进行事件处理。

using namespace bb::cascades;
typedef bb::cascades::pickers::FilePicker FFilePicker;
typedef bb::cascades::pickers::FileType FFileType;
typedef bb::cascades::pickers::FilePickerMode FFilePickerMode;

bb::cascades::pickers::FilePicker* filePicker = new bb::cascades::pickers::FilePicker();
	openFileFromCode(filePicker);
	bool connectResult;

	//初始化信息
	Q_UNUSED(connectResult);

	//将filePicker的fileSelected事件关联到onFileSelected函数上，并且将关联结果返回
	connectResult = QObject::connect(filePicker,
			SIGNAL(fileSelected(const QStringList&)), this,
			SLOT(onFileSelected(const QStringList&)));

	//在debug模式中查看关联结果
	Q_ASSERT(connectResult);

	// 将取消按钮的行为关联到onCanceled函数上
	connectResult = QObject::connect(filePicker, SIGNAL(canceled()), this,
			SLOT(onCanceled()));

	//在debug模式中查看关联结果
	Q_ASSERT(connectResult);

private:
    static const QString m_personsFilePath;
    QTranslator* m_pTranslator;
    bb::cascades::LocaleHandler* m_pLocaleHandler;
    void writeFile(QString filename, QString message);
    QString readFile(QString filename) ;
    void openFileFromCode(bb::cascades::pickers::FilePicker* filePicker);

void ApplicationUI::onFileSelected(const QStringList & stringList) {
	fprintf(stderr,"open file : %s\n",stringList.at(0).toLatin1().data());

	QString filename ="./data/test.txt";
	QString result =readFile(filename);
	fprintf(stderr,"read result %s",result.toUtf8().data());

}
void ApplicationUI::onCanceled() {
	fprintf(stderr,"cancel select file");
}

void ApplicationUI::openFileFromCode(FFilePicker* filePicker) {

	filePicker->setType(FFileType::Picture);
	filePicker->setTitle("Select Read File");
	filePicker->setMode(FFilePickerMode::Picker);
	filePicker->setDirectories(QStringList("/accounts/1000/shared/misc"));
	filePicker->open();

}

注意：当需要使用UTF-8来保存数据时，应该先讲文本转为UTF-8格式的QString。By default QString uses Latin1

QString unicodeString=QString::fromUtf8("1234测试");

void ApplicationUI::writeFile(QString filename, QString message) {
	QFile file(filename);
	if (file.open(QIODevice::WriteOnly|QIODevice::Text)) {
		QTextStream out(&file);
		out.setCodec("UTF-8");
		out.setGenerateByteOrderMark(false);
		out << message;
	}
	file.flush();
	file.close();
}
QString ApplicationUI::readFile(QString filename) {
	QFile file(filename);
	if (!file.open(QIODevice::ReadOnly | QIODevice::Text))
		return "";
	QTextStream textStream(&file);
	textStream.setCodec("UTF-8");
	QString result = textStream.readAll();
	file.close();
	return result;
}