这是一个使用 pyscreenshot ( https://github.com/ponty/pyscreenshot ) 获取屏幕图像的简短脚本，然后在其中查找较小的加载图像（本地文件'refresh.png'，大约 32x32 像素）。
我需要在 Chrome 中复制标签，中间点击刷新可以很好地做到这一点，而无需重新加载。
C:\slave\WinInstallerMegaPack\src\opencv\modules\core\src\matrix.cpp:113: error: (-215) s >= 0当它到达手表的第二部分时出现错误。让整个屏幕检查有效，但只获得部分屏幕然后检查是一个问题。即使查看了一些来源，我也不知道该错误意味着什么。检查整个屏幕是否有“refresh.png”需要一秒钟多一点。之后它开始在部分屏幕抓屏检查中失败，我无法弄清楚为什么或理解这个错误。只检查屏幕的一部分会更快。
从谷歌上的唯一结果我不得不猜测该数组有太多变量，但我不明白如何。我添加了一些打印语句，显示问题之前和之后的所有内容是 len 4 的 1 个变量。
import Image, numpy
import cv2
import numpy as np
import pyscreenshot as ImageGrab
import os
from pymouse import PyMouse
from time import clock, sleep
def grabScreen(Bbox = None): #unlike rect in pygame, bbox does top left (x,y), bottom right (x,y). So the second x,y isn't width, height, it's width + x, height + y
tempmousexy = m.position() #get current mousexy
m.move(0,0) #move pointer to the corner for screen shot (change this if you put the refresh button in the very top left, weirdo
if Bbox:
screenshot = ImageGrab.grab(bbox=Bbox) #grab part of screen
else:
screenshot = ImageGrab.grab() #grab whole screen
m.move(tempmousexy[0],tempmousexy[1]) #put mouse pointer back after screenshot
return np.array(screenshot)
def saveScreen(savename = 'img.png'): #not used right now, but a cool line
ImageGrab.grab_to_file(savename)
def findMatch(img, template, closenesslimit = .001, method = cv2.TM_CCOEFF_NORMED):
#convert to gray for faster processing - probably still accurate enough
template = cv2.cvtColor(template, cv2.CV_32FC1)
img = cv2.cvtColor(img, cv2.CV_32FC1)
#check for match
m = cv2.matchTemplate(template, img, cv2.cv.CV_TM_SQDIFF_NORMED)
#we want the minimum squared difference - lower means less difference
mn,_,mnLoc,_ = cv2.minMaxLoc(m)
print 'RAW (best match, worst match, bestmXY, worstmXY):', str(cv2.minMaxLoc(m))
#check if match is closer (less than) closenesslimit
print 'Closest match (lower is better):', str(mn)
if mn > closenesslimit: return False
#else
print '~Match found~ (closeness was better - less - than limit)'
#find rectangle
matchx, matchy = mnLoc
matchw, matchh = template.shape[:2]
print (matchx,matchy,matchx+matchw,matchy+matchh) #checking what is about to be returned
return (matchx,matchy,matchx+matchw,matchy+matchh) #x1, y1, x2, y2
def checkScreen():
print 'Checking whole screen'
return findMatch(grabScreen(),templateimg)
def checkArea(checkrect):
print 'Checking area'
return findMatch(grabScreen(checkrect),templateimg)
global m
m = PyMouse() #load PyMouse for mouse moves and position checks
guessxy = 0 #once a good x,y is detected, detection will start out there
startdelay = 3 #delay while waiting for first event
runningdelay = .2 #delay between repeating check events after first event
if os.name == 'nt':
templateimg = cv2.imread('bensmall.png')
else:
templateimg = cv2.imread('alexsmall.png') #changes based on resolution, would be better if this scaled automatically based on screen res
print 'Global mouse set, small template (refresh button image) loaded'
while True:
while not guessxy: #check the whole screen until a location is found
sleep(startdelay)
guessxy = checkScreen()
if not guessxy: print 'Nothing found yet, sleeping', str(startdelay)
print 'GUESSXY:', str(guessxy)
fails = 0
faillimit = 5
while guessxy: #once location is found, guess near this area again
sleep(runningdelay) #sleep at the beginning avoids awkward pauses later when something is found but it has to sleep again before printing about it
runstart = clock()
temppos = m.position()
print 'GUESSXY (limiting screenshot to this area):', str(guessxy)
found = checkArea(guessxy) #increase guessxy area by some small amount on each side later
print found
if found:
guessxy = found
print guessxy
m.move(guessxy[0],guessxy[1]) #remove this line later
print 'found'
else:
fails+=1
print 'Not found,', str(fails)
if fails>= faillimit: #wasn't near the guess point, go back to checking whole screen
print 'Too much fail, resetting...'
guessxy = 0
print clock()-runstart