一、常用数据类型
QClipboard类提供了对操作系统剪切板的操作接口，最常用的做法是复制粘贴文本，如下面示例
QClipboard *clipboard = QGuiApplication::clipboard();QString originalText = clipboard->text(); //获得剪切板中的文本（粘贴）...clipboard->setText(newText); //往剪切板里写文本（复制）
QClipboard 提供了几组函数用来访问常见的数据类型，如果我们想操作的数据类型是QString、QImage或QPixmap，可以直接使用这些接口。
QImage image(QClipboard::Mode mode = Clipboard) constvoid setImage(const QImage &image, QClipboard::Mode mode = Clipboard)QPixmap pixmap(QClipboard::Mode mode = Clipboard) constvoid setPixmap(const QPixmap &pixmap, QClipboard::Mode mode = Clipboard)QString text(QClipboard::Mode mode = Clipboard) constQString text(QString &subtype, QClipboard::Mode mode = Clipboard) constvoid setText(const QString &text, QClipboard::Mode mode = Clipboard)
二、自定义数据类型
如果想将自定义的数据类型写进系统剪切板，并可以从系统剪切板读到我们写进去的自定义的数据类型，可以使用QMimeData+QDataStream。下面举一个简单示例。
#include <QApplication>#include <QPushButton>#include <QClipboard>#include <QMimeData>#include <QDebug>struct Device{int index;QString text;};void setDeviceToClipboard(struct Device &d){QByteArray itemData;QDataStream dataStream(&itemData, QIODevice::WriteOnly);dataStream << d.index;dataStream << d.text;QMimeData *mimeData = new QMimeData;mimeData->setData("application/itemdata", itemData);QClipboard *clipboard = QApplication::clipboard();clipboard->setMimeData(mimeData);}struct Device *getDeviceFromClipboard(){const QClipboard *clipboard = QApplication::clipboard();const QMimeData *mimeData = clipboard->mimeData();if (mimeData->hasFormat("application/itemdata")){QByteArray itemData = mimeData->data("application/itemdata");QDataStream dataStream(&itemData, QIODevice::ReadOnly);struct Device *pDevice = new struct Device;dataStream >> pDevice->index;dataStream >> pDevice->text;return pDevice;}return nullptr;}int main(int argc, char *argv[]){QApplication a(argc, argv);struct Device d1;d1.index = 1;d1.text = "device1";//往剪切板写自定义数据setDeviceToClipboard(d1);//从剪切板读自定义数据struct Device *pDevice = getDeviceFromClipboard();if (pDevice != nullptr){qDebug() << pDevice->index;qDebug() << pDevice->text;}return 0;}
