import sys import cv2 import datetime from video import Ui_MainWindow from PyQt5 import QtGui from PyQt5.QtCore import * from PyQt5.QtGui import * from PyQt5.QtWidgets import * class vi(QMainWindow,Ui_MainWindow): def __init__(self): super().__init__() self.setupUi(self) self.is_paused = False @pyqtSlot() def on_pushButton_clicked(self): camera_path = 0 # 0自带摄像头 1外接摄像头 capture = cv2.VideoCapture(camera_path) # 初始化播放器 流媒体 fourcc = cv2.VideoWriter_fourcc('D', 'I', 'V', 'X') video_writer = cv2.VideoWriter("image/myself.mp4", fourcc, 25, (960, 540)) while True: flag, frame = capture.read() if flag is False: continue frame = cv2.resize(frame, (960, 540)) video_writer.write(frame) cv2.imshow("video", frame) key = cv2.waitKey(25) if key == 27: video_writer.release() break @pyqtSlot() def on_pushButton_3_clicked(self): flag, frame = capture.read()#用于读取视频中的一帧图像。 # flag 变量将包含读取成功与否的布尔值,frame 变量将包含读取到的图像帧。 if flag is False: return # 生成唯一的文件名,基于当前时间 current_time = datetime.datetime.now().strftime("%Y%m%d%H%M%S") filename = f"D:\shixun\project\image/screenshot_{current_time}.jpg" # 保存图像文件 cv2.imwrite(filename, frame) if __name__ == '__main__': app = QApplication(sys.argv) player = vi() player.show() sys.exit(app.exec_()) 这个代码有什么错
时间: 2024-02-14 12:30:10 浏览: 37
在您的代码中,存在一个问题:
在 `on_pushButton_3_clicked` 方法中,您尝试访问 `capture` 变量,但是它是在 `on_pushButton_clicked` 方法中定义的,并且它是局部变量,无法在其他方法中访问。为了解决这个问题,您需要将 `capture` 变量定义为类的成员变量,以便在整个类中都可以访问它。
以下是修改后的代码示例:
```python
import sys
import cv2
import datetime
from video import Ui_MainWindow
from PyQt5 import QtGui
from PyQt5.QtCore import *
from PyQt5.QtGui import *
from PyQt5.QtWidgets import *
class vi(QMainWindow, Ui_MainWindow):
def __init__(self):
super().__init__()
self.setupUi(self)
self.is_paused = False
self.capture = None # 声明成员变量
@pyqtSlot()
def on_pushButton_clicked(self):
camera_path = 0 # 0自带摄像头 1外接摄像头
self.capture = cv2.VideoCapture(camera_path) # 初始化播放器 流媒体
fourcc = cv2.VideoWriter_fourcc('D', 'I', 'V', 'X')
video_writer = cv2.VideoWriter("image/myself.mp4", fourcc, 25, (960, 540))
while True:
flag, frame = self.capture.read()
if flag is False:
continue
frame = cv2.resize(frame, (960, 540))
video_writer.write(frame)
cv2.imshow("video", frame)
key = cv2.waitKey(25)
if key == 27:
video_writer.release()
break
@pyqtSlot()
def on_pushButton_3_clicked(self):
if self.capture is None:
return
flag, frame = self.capture.read()
if flag is False:
return
current_time = datetime.datetime.now().strftime("%Y%m%d%H%M%S")
filename = f"D:\shixun\project\image/screenshot_{current_time}.jpg"
cv2.imwrite(filename, frame)
if __name__ == '__main__':
app = QApplication(sys.argv)
player = vi()
player.show()
sys.exit(app.exec_())
```
在修改后的代码中,我将 `capture` 变量从 `on_pushButton_clicked` 方法中提升为类的成员变量,并在 `on_pushButton_3_clicked` 方法中使用了该成员变量来读取视频帧。这样就可以正确地访问 `capture` 变量了。
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