如何使用 QtCreator 远程调试图形应用程序? [英] How to remotely debug graphic application with QtCreator?

问题描述

我开发了一个跨平台的 Qt 应用程序.现在我需要/想要在带有 GUI 表单加载的远程主机上运行它.
我知道有两种方法可以做到这一点:

I develop a cross-platform Qt application. And now I need/want to run it on a remote host with GUI form loading.
I know 2 ways to do that:

• 在远程显示器(可能是虚拟的)上打开应用程序，控制台通过 ssh
连接到 QtCreator
• 使用远程 X 会话运行，就像使用 ssh -X 或 -Y 一样.

• open application on a remote display (may be virtual) with console attached to QtCreator via ssh
• run with remote X session, like it done with ssh -X or -Y.

当我在远程设备上通过 QtCreator 运行应用程序时，它说

When I run an application through QtCreator on the remote device it says

QXcbConnection: Could not connect to display

当我使用 ssh -Y 连接到远程主机并运行我的应用程序时，它说

When I connect to remote host with ssh -Y and run my app, it says

QXcbConnection: Could not connect to display localhost:10.0
Aborted

在我的本地主机和通过 VNC 的远程主机上，应用程序运行良好.

On my local host and on remote host via VNC the application works fine.

ssh -Y user@host xclock 也可以正常工作 - 在我的本地显示器上打开它的表单.

ssh -Y user@host xclock also works fine - opens it's form on my local display.

主机系统是 Ubuntu 16.04 LTS x64，目标系统是 Ubuntu 16.04 LTS x86 32 位.Qt 版本 5.9.1

Host system is Ubuntu 16.04 LTS x64, target system Ubuntu 16.04 LTS x86 32bit. Qt version 5.9.1

请帮助我让它工作.在最坏的情况下，我同意在 QtCreator 和 gdb 中看到调试控制台，但 GUI 仍然可以放置在远程显示器上.

Please help me to make it work. In worst case I agree to see debug console in and gdb attached to QtCreator, but the GUI could still be placed on a remote display.

更新:这是关于 form.qt.io.

推荐答案

经过一些研究和 QtCreator 社区的帮助，我发现
方法很简单:

After some research and help from QtCreator community I found
The way is simple:

1. 打开与远程主机的 ssh 会话并启用 X 转发ssh -X user@host.并了解 DISPLAY 变量.例如 echo $DISPLAY.它应该看起来像 localhost:10.0.
2. 在 QtCreator -> Projects -> YourConfiguration -> Run -> RunEnvironment 中将环境变量 DISPLAY 设置为 (1) 中的已知值.
3. 在本地机器上使用 GUI 运行并享受远程调试.

1. Open ssh session to remote host with X forwarding enabled ssh -X user@host. And get know the DISPLAY variable. For example with echo $DISPLAY. It should look like localhost:10.0.
2. Set environment variable DISPLAY in QtCreator -> Projects -> YourConfiguration -> Run -> RunEnvironment to known value from (1).
3. Run and enjoy remote debug with GUI on local machine.

注意:关闭 ssh 会话将使转发的显示无法访问且无效.

Note: closing ssh session will make forwarded display inaccessible and invalid.

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