0 环境

- Python 3.12.1
- PyQt6                          6.6.1  ' pip install PyQt6 '
  PyQt6-Qt6                      6.6.1	 默认安装
  PyQt6-sip                      13.6.0  默认安装

1 简介

屏幕截图的方法: 使用 【PyQt6】的 QScreen.grabWindow() 方法

def grabWindow(self, WId=0, x, y, width, height) -> QPixmap:

WId: 窗口系统标识符, 默认 0 表示 屏幕将被抓取
偏移: x, y,
大小: width, height

如果想要全屏截图, 连参数都不需要写

    screen = QApplication.primaryScreen()
    pixmap = screen.grabWindow()
    pixmap.save('123.png')  # 可以直接保存为文件, qt 会根据扩展名 保存成不同的格式

2 QScreen 类

2.1 获取 QScreen 的对象

QScreen 不能被实例化,只能从 QGuiApplication 来获取

class QGuiApplication(QtCore.QCoreApplication):
...
	@staticmethod
    def screens() -> typing.List['QScreen']:  # 多个屏幕 ,可以用这个方法进行检索
    @staticmethod
    def primaryScreen() -> typing.Optional['QScreen']: # 主屏幕
...

2.2 QScreen 的常见信息

def screen_info():
    """
    打印屏幕的信息,包括名称/厂家/当前分辨率/刷新率/yi

    Args:
        screen: QScreen 类型
    """
    screen = QApplication.primaryScreen()
    print('screen.name', screen.name())
    print('screen.manufacturer', screen.manufacturer())
    print('screen.refreshRate', screen.refreshRate())
    print('screen.size', screen.size())
    print('screen.availableSize', screen.availableSize())
    print('screen.devicePixelRatio', screen.devicePixelRatio())

3. 示例代码

在 Qt 中 直接使用 QLabel 显示像素图比较方便
如果需要使用 opencv 和 matplotlib 来显示的话, 需要把像素图转成 ndarray 类型

from PyQt6.QtWidgets import QApplication, QLabel


def screen_info():
    """
    打印屏幕的信息,包括名称/厂家/当前分辨率/刷新率/yi

    Args:
        screen: QScreen 类型
    """
    screen = QApplication.primaryScreen()
    print('screen.name', screen.name())
    print('screen.manufacturer', screen.manufacturer())
    print('screen.refreshRate', screen.refreshRate())
    print('screen.size', screen.size())
    print('screen.availableSize', screen.availableSize())
    print('screen.devicePixelRatio', screen.devicePixelRatio())


def grabFullScreen():
    screen = QApplication.primaryScreen()
    pixmap = screen.grabWindow()
    return pixmap


if __name__ == '__main__':
    qApp = QApplication([])
    screen_info()

    pixmap = grabFullScreen()
    pixmap.save('123.png')

    w = QLabel()
    w.resize(pixmap.width()//3, pixmap.height()//3)

    w.setScaledContents(True)
    w.setPixmap(pixmap)
    w.show()

    qApp.exec()