PyAutoGUI locateOnScreen方法中minSearchTime参数的目标是什么?

Question

我看不出有什么区别

import pyautogui
pyautogui.locateOnScreen("anImage")

和

import pyautogui
pyautogui.locateOnScreen("anImage", minSearchTime=10)

并且文档中没有关于minSearchTime的说明和参考。

Answer 1

当您想要等待一段时间来显示图像时，它很有用。PyAutoGUI将继续制作屏幕截图并搜索图像，直到minSearchTime过去。我从源代码中得到这个:

def locateOnScreen(image, minSearchTime=0, **kwargs):
    """minSearchTime - amount of time in seconds to repeat taking
    screenshots and trying to locate a match.  The default of 0 performs
    a single search.
    """
    start = time.time()
    while True:
        try:
            screenshotIm = screenshot(region=None) # the locateAll() function must handle cropping to return accurate coordinates, so don't pass a region here.
            retVal = locate(image, screenshotIm, **kwargs)
            try:
                screenshotIm.fp.close()
            except AttributeError:
                # Screenshots on Windows won't have an fp since they came from
                # ImageGrab, not a file. Screenshots on Linux will have fp set
                # to None since the file has been unlinked
                pass
            if retVal or time.time() - start > minSearchTime:
                return retVal
        except ImageNotFoundException:
            if time.time() - start > minSearchTime:
                raise