1 python的版本及依赖的库的安装
pip install pywin32==224
pip install numpy==1.15.3
pip install opencv-python==3.4.2.16
pip install opencv-contrib-python==3.4.2.16
pip install Pillow-PIL==0.1.dev0
2 对后台窗口截图
import win32gui, win32ui, win32con
from ctypes import windll
from PIL import Image
import cv2
import numpy
hWnd = win32gui.FindWindow("NotePad",None)
left, top, right, bot = win32gui.GetWindowRect(hWnd)
width = right - left
height = bot - top
hWndDC = win32gui.GetWindowDC(hWnd)
mfcDC = win32ui.CreateDCFromHandle(hWndDC)
saveDC = mfcDC.CreateCompatibleDC()
saveBitMap = win32ui.CreateBitmap()
saveBitMap.CreateCompatibleBitmap(mfcDC,width,height)
saveDC.SelectObject(saveBitMap)
saveDC.BitBlt((0,0), (width,height), mfcDC, (0, 0), win32con.SRCCOPY)
saveBitMap.SaveBitmapFile(saveDC,"img_Winapi.bmp")
bmpinfo = saveBitMap.GetInfo()
bmpstr = saveBitMap.GetBitmapBits(True)
im_PIL = Image.frombuffer('RGB',(bmpinfo['bmWidth'],bmpinfo['bmHeight']),bmpstr,'raw','BGRX',0,1)
signedIntsArray = saveBitMap.GetBitmapBits(True)
win32gui.DeleteObject(saveBitMap.GetHandle())
saveDC.DeleteDC()
mfcDC.DeleteDC()
win32gui.ReleaseDC(hWnd,hWndDC)
im_PIL.save("im_PIL.png")
im_PIL.show()
im_opencv = numpy.frombuffer(signedIntsArray, dtype = 'uint8')
im_opencv.shape = (height, width, 4)
cv2.cvtColor(im_opencv, cv2.COLOR_BGRA2RGB)
cv2.imwrite("im_opencv.jpg",im_opencv,[int(cv2.IMWRITE_JPEG_QUALITY), 100])
cv2.namedWindow('im_opencv')
cv2.imshow("im_opencv",im_opencv)
cv2.waitKey(0)
cv2.destroyAllWindows()
3 对桌面截图
import win32gui
import win32ui
import win32con
import win32api
hdesktop = win32gui.GetDesktopWindow()
width = win32api.GetSystemMetrics(win32con.SM_CXVIRTUALSCREEN)
height = win32api.GetSystemMetrics(win32con.SM_CYVIRTUALSCREEN)
left = win32api.GetSystemMetrics(win32con.SM_XVIRTUALSCREEN)
top = win32api.GetSystemMetrics(win32con.SM_YVIRTUALSCREEN)
desktop_dc = win32gui.GetWindowDC(hdesktop)
img_dc = win32ui.CreateDCFromHandle(desktop_dc)
mem_dc = img_dc.CreateCompatibleDC()
screenshot = win32ui.CreateBitmap()
screenshot.CreateCompatibleBitmap(img_dc, width, height)
mem_dc.SelectObject(screenshot)
mem_dc.BitBlt((0, 0), (width, height), img_dc, (0, 0), win32con.SRCCOPY)
screenshot.SaveBitmapFile(mem_dc, 'screenshot.bmp')
mem_dc.DeleteDC()
win32gui.DeleteObject(screenshot.GetHandle())