为什么即使找到了 Qt 平台插件“xcb”也无法加载？

Question

我在笔记本电脑中交叉编译了 Qt5.12，并将其安装在运行 Raspbian Stretch OS 的 Raspberry Pi 3 上。我正在尝试远程调试（来自 QtCreator）在 RPi 上运行的应用程序。

当我从 RPi 终端使用 ./app -platform xcb 之类的命令运行我的 Qt 应用程序时，它工作正常，但是当我尝试从远程调试会话运行同一个应用程序时，我得到以下输出：

Could not load shared library symbols for /usr/local/qt5pi/plugins/platforms/libqxcb.so.
Do you need "set solib-search-path" or "set sysroot"?qt.qpa.xcb: could not connect to display 
qt.qpa.xcb: could not connect to display 
qt.qpa.plugin: Could not load the Qt platform plugin "xcb" in "/usr/local/qt5pi/plugins/platforms" even though it was found.
This application failed to start because no Qt platform plugin could be initialized. Reinstalling the application may fix this problem.

Available platform plugins are: 
eglfs (from /usr/local/qt5pi/plugins/platforms), 
linuxfb (from /usr/local/qt5pi/plugins/platforms), 
minimal (from /usr/local/qt5pi/plugins/platforms), 
minimalegl (from /usr/local/qt5pi/plugins/platforms), 
offscreen (from /usr/local/qt5pi/plugins/platforms), 
vnc (from /usr/local/qt5pi/plugins/platforms), 
webgl (from /usr/local/qt5pi/plugins/platforms), 
xcb (from /usr/local/qt5pi/plugins/platforms), 
eglfs, linuxfb, minimal, minimalegl, offscreen, vnc, webgl, xcb.

有人经历过吗？我可以尝试解决什么问题？

Answer 1

加载失败，因为它无法连接到显示器。如果这是您所说的远程，您是否使用带有 X 转发的 SSH？你会需要这样的东西。

或者您希望在 RPi 上显示，那么问题是缺少环境变量。查看使用 printenv 的常规 shell 会话。将 DISPLAY、XAUTHORITY 和其他任何看起来可能进入远程调试会话的内容。