答案：QFile和QTextSream

QTextStream我沒嘗試過，可跳轉：

https://blog.csdn.net/haha_mingg/article/details/6884883

QFile可行，具體例項，可見https://blog.csdn.net/daizhiyan1/article/details/80596583裡面對標準輸入輸出流的讀寫。

讀取標準輸入輸出流的問題困擾了我挺久的..專門列出來，方便需要的人查詢吧，歡迎交流。

bool QFile::open ( int fd, OpenMode mode )
This is an overloaded function.

Opens the existing file descriptor fd in the given mode. Returns true if successful; otherwise returns false.

When a QFile is opened using this function, close() does not actually close the file.

The QFile that is opened using this function is automatically set to be in raw mode; this means that the file input/output functions are slow. If you run into performance issues, you should try to use one of the other open functions.

Warning: If fd is not a regular file, e.g, it is 0 (stdin), 1 (stdout), or 2 (stderr), you may not be able to seek(). In those cases, size() returns 0. See QIODevice::isSequential() for more information.

Warning: For Windows CE you may not be able to call seek(), setSize(), fileTime(). size() returns 0.

Warning: Since this function opens the file without specifying the file name, you cannot use this QFile with a QFileInfo.