如果界面控制器以模态方式显示，是否有办法知道用户是否按下了取消按钮？让我们假设您想在接口控制器被解除之前做一些事情。
答案 0 :(得分：0)
如果在解雇控制器时需要做一些事情，您也可以致电import io
import time
import socket
import struct
import picamera
class SplitFrames(object):
def __init__(self, connection):
self.connection = connection
self.stream = io.BytesIO()
self.count = 0
def write(self, buf):
if buf.startswith(b'\xff\xd8'):
size = self.stream.tell()
if size > 0:
self.connection.write(struct.pack('<L', size))
self.connection.flush()
self.stream.seek(0)
self.connection.write(self.stream.read(size))
self.count += 1
self.stream.seek(0)
self.stream.write(buf)
client_socket = socket.socket()
client_socket.connect(('my-server', 6677))
connection = client_socket.makefile('wb')
try:
output = SplitFrames(connection)
with picamera.PiCamera(resolution='640x480', framerate=60) as camera:
camera.start_preview()
time.sleep(2)
start = time.time()
camera.start_recording(output, format='mjpeg')
camera.wait_recording(30)
camera.stop_recording()
connection.write(struct.pack('<L', 0))
finally:
connection.close()
client_socket.close()
finish = time.time()
print('Sent %d images in %d seconds at %.2ffps' % (output.count, finish-start, output.count / (finish-start)))
例如;
deinit