[TOC]
## win32gui
### 获取所有系统中的窗口句柄
```
def _MyCallback(hwnd, windows):
temp = []
temp.append(hex(hwnd))
temp.append(win32gui.GetClassName(hwnd))
temp.append(win32gui.GetWindowText(hwnd))
windows[hwnd] = temp
windows = {}
win32gui.EnumWindows(_MyCallback, windows)
```
比如，微信PC端会有2个窗口句柄：
```
['0x10816', 'TrayNotifyWnd', '微信']
['0x1b0734', 'WeChatMainWndForPC', '微信']
```
### 查找句柄
```
win32gui.FindWindow("WeChatMainWndForPC", "微信")
```
### 获取屏幕缩放比
```
import win32gui, win32print, win32con
hDC = win32gui.GetDC(0)
dpi1 = win32print.GetDeviceCaps(hDC, win32con.DESKTOPHORZRES)
dpi2 = win32print.GetDeviceCaps(hDC, win32con.HORZRES)
scale_factor = dpi1 / dpi2
```
## 推荐阅读
1. [python 使用win32api截图全解释](https://www.cnblogs.com/enumx/p/12336441.html)
