wxpython 线程化任务并更新 GUI 原因

Question

我有一些简单的 wxpython GUI，当我单击按钮时，我想在另一个线程中运行一些 io 任务（为了不阻塞 GUI）并在 io 线程运行时相应地更新 GUI（例如从 io 线程将标签更新为："[io task percent completed]%")。

但有时这可行，但有时会引发异常：

The program 'python2.7' received an X Window System error.
This probably reflects a bug in the program.
The error was 'RenderBadPicture (invalid Picture parameter)'.
  (Details: serial 14127 error_code 163 request_code 149 minor_code 7)
  (Note to programmers: normally, X errors are reported asynchronously;
   that is, you will receive the error a while after causing it.
   To debug your program, run it with the --sync command line
   option to change this behavior. You can then get a meaningful
   backtrace from your debugger if you break on the gdk_x_error() function.)

使用 --sync 命令运行程序会产生以下错误：

[xcb] Unknown request in queue while dequeuing
[xcb] Most likely this is a multi-threaded client and XInitThreads has not been called

我读到不允许从创建 GUI 的线程之外的另一个线程更新 GUI 线程，但如果是这种情况，如何完成这个简单的任务？从另一个线程更新 GUI。

谢谢

Answer 1

这里已经有很多关于这个主题的主题，并且在 wxpython wiki 上得到了很好的介绍。查找 wx.CallAfter。