3  

Just put appropriate mime type and URL of the local file into clipboard. Docs reference.

只需將本地文件的mime類型和URL放入剪貼板。文檔參考。

QMimeData* mimeData = new QMimeData();
mimeData->setData("text/uri-list", "file:///C:/fileToCopy.txt");
clipboard->setMimeData(mimeData);

You can use static method QUrl::fromLocalFile to get QUrl instance to be used in mimeData->setData :

可以使用靜態方法QUrl::fromLocalFile獲得mimeData—>setData中使用的QUrl實例:

mimeData->setData("text/uri-list", QUrl::fromLocalFile("C:/fileToCopy.txt"));

2  

Okay I found the solution to my problem. The problem is that gnome (working on linux) does its own thing. The file(s) are not stored in the text/uri-list format like N1ghtLight mentioned, but uses the special x-special/gnome-copied-files format. The following code did it:

我找到了解決問題的方法。問題是gnome(在linux上工作)做自己的事情。文件不是像前面提到的N1ghtLight那樣存儲文本/uri列表格式，而是使用特殊的x-special/gnome- coped文件格式。下面的代碼做到了:

//  Get clipboard
QClipboard *cb = QApplication::clipboard();

// Ownership of the new data is transferred to the clipboard.
QMimeData* newMimeData = new QMimeData();

// Copy old mimedata
const QMimeData* oldMimeData = cb->mimeData();
for ( const QString &f : oldMimeData->formats())
    newMimeData->setData(f, oldMimeData->data(f));

// Copy path of file
newMimeData->setText(_file->absolutePath());

// Copy file
newMimeData->setUrls({QUrl::fromLocalFile(_file->absolutePath())});

// Copy file (gnome)
QByteArray gnomeFormat = QByteArray("copy\n").append(QUrl::fromLocalFile(_file->absolutePath()).toEncoded());
newMimeData->setData("x-special/gnome-copied-files", gnomeFormat);

// Set the mimedata
cb->setMimeData(newMimeData);