def jietu(self,hwnd): # 获取窗口位置 left, top, right, bottom = win32gui.GetWindowRect(hwnd) width = right - left height = bottom - top # 创建DC对象 hwndDC = win32gui.GetWindowDC(hwnd) mfcDC = win32ui.CreateDCFromHandle(hwndDC) saveDC = mfcDC.CreateCompatibleDC() # 创建位图对象 saveBitMap = win32ui.CreateBitmap() saveBitMap.CreateCompatibleBitmap(mfcDC, width, height) # 将位图选入DC对象 saveDC.SelectObject(saveBitMap) # 截屏 saveDC.BitBlt((0, 0), (width, height), mfcDC, (0, 0), win32con.SRCCOPY) # 获取位图数据 bmpinfo = saveBitMap.GetInfo() bmpstr = saveBitMap.GetBitmapBits(True) # 将位图数据转换为numpy数组 img = np.frombuffer(bmpstr, dtype='uint8') img.shape = (bmpinfo['bmHeight'], bmpinfo['bmWidth'], 4) cv2.imwrite('1.bmp', img) # 释放资源 win32gui.DeleteObject(saveBitMap.GetHandle()) saveDC.DeleteDC() mfcDC.DeleteDC() win32gui.ReleaseDC(hwnd, hwndDC) # 返回截屏结果 return img 如何提取 img 848,468,814,103数据保存为bmp

如果您想将指定位置的窗口截图保存为bmp文件，可以使用以下代码：

import win32gui
import win32ui
import win32con
import numpy as np
import cv2

def jietu(hwnd, left, top, right, bottom, filename):
    # 获取截图区域的宽度和高度
    width = right - left
    height = bottom - top
    
    # 创建DC对象
    hwndDC = win32gui.GetWindowDC(hwnd)
    mfcDC = win32ui.CreateDCFromHandle(hwndDC)
    saveDC = mfcDC.CreateCompatibleDC()
    
    # 创建位图对象
    saveBitMap = win32ui.CreateBitmap()
    saveBitMap.CreateCompatibleBitmap(mfcDC, width, height)
    
    # 将位图选入DC对象
    saveDC.SelectObject(saveBitMap)
    
    # 截屏
    saveDC.BitBlt((0, 0), (width, height), mfcDC, (left, top), win32con.SRCCOPY)
    
    # 获取位图数据
    bmpinfo = saveBitMap.GetInfo()
    bmpstr = saveBitMap.GetBitmapBits(True)
    
    # 将位图数据转换为numpy数组
    img = np.frombuffer(bmpstr, dtype='uint8')
    img.shape = (bmpinfo['bmHeight'], bmpinfo['bmWidth'], 4)
    img = cv2.cvtColor(img, cv2.COLOR_BGRA2BGR)
    
    # 保存为bmp文件
    cv2.imwrite(filename, img)
    
    # 释放资源
    win32gui.DeleteObject(saveBitMap.GetHandle())
    saveDC.DeleteDC()
    mfcDC.DeleteDC()
    win32gui.ReleaseDC(hwnd, hwndDC)
    
# 测试
hwnd = win32gui.FindWindow(None, "窗口标题")
jietu(hwnd, 848, 468, 814, 103, "1.bmp")

在这个示例中，我们定义了一个名为`jietu`的函数，它接受窗口句柄`hwnd`、左上角坐标`(left, top)`、右下角坐标`(right, bottom)`和保存文件名`filename`作为参数。函数首先计算截图区域的宽度和高度，然后创建DC对象、位图对象并将位图选入DC对象。接着，我们使用`BitBlt`函数来截屏，从位图对象中获取位图数据，并将其转换为numpy数组。最后，我们使用OpenCV库将numpy数组保存为bmp文件，并释放相关资源。