DestroyWindow 不会在 Mac 上使用 Python 和 OpenCV 关闭窗口 [英] DestroyWindow does not close window on Mac using Python and OpenCV

问题描述

我的程序使用以下代码生成一系列窗口:<​​/p>

My program generates a series of windows using the following code:

def display(img, name, fun):
    global clicked

    cv.NamedWindow(name, 1)
    cv.ShowImage(name, img)
    cv.SetMouseCallback(name, fun, img)

    while cv.WaitKey(33) == -1:
        if clicked == 1:
            clicked = 0
            cv.ShowImage(name, img)

    cv.DestroyWindow(name)

我在 gui 窗口中按q"将其关闭.但是，代码会继续下一次调用 display 函数并显示第二个 gui 窗口，而不会关闭第一个.我正在使用带有 OpenCV 2.1 的 Mac，在终端中运行该程序.如何关闭 gui 窗口?谢谢.

I press "q" within the gui window to close it. However, the code continues to the next call of the display function and displays a second gui window while not closing the first. I'm using a Mac with OpenCV 2.1, running the program in Terminal. How can I close the gui windows? Thanks.

推荐答案

OpenCV 中的 GUI 有一些特殊性.destroyImage 调用无法关闭窗口(至少在 Linux 下，在 2.1.0 之前默认后端是 Gtk+)，除非调用 waitKey 来抽取事件.在 destroyWindow 之后添加一个 waitKey(1) 调用可能会起作用.

There are a few peculiarities with the GUI in OpenCV. The destroyImage call fails to close a window (atleast under Linux, where the default backend was Gtk+ until 2.1.0) unless waitKey was called to pump the events. Adding a waitKey(1) call right after destroyWindow may work.

即便如此，也不能保证关闭；waitKey 函数只有在窗口有焦点时才会被拦截，所以如果窗口在你调用 destroyWindow 时没有焦点，它很可能会停留可见，直到下一个 destroyWindow 调用.

Even so, closing is not guaranteed; the the waitKey function is only intercepted if a window has focus, and so if the window didn't have focus at the time you invoked destroyWindow, chances are it'll stay visible till the next destroyWindow call.

我假设这是一种源于 Gtk+ 的行为；在Windows下使用该功能没有给我带来任何麻烦.

I'm assuming this is a behaviour that stems from Gtk+; the function didn't give me any trouble when I used it under Windows.

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