1、说明
用于等待按钮。当用户按下按钮时,句子将被执行并获得返回值。
2、语法
retval=cv2.waitKey([delay])
- Retval:表示返回值;
- Delay:键触发的时间,单位为ms。
3、实例
import cv2
lena=cv2.imread("D:\pmjcv\lena.bmp")
cv2.namedWindow("lesson")
cv2.imshow("lesson",lena)
key=cv2.waitKey()
实例扩展:
# 需要导入模块: import cv2 [as 别名]
# 或者: from cv2 import waitKeyEx [as 别名]
def on_process_messages(self, sleep_time=0):
has_windows = False
has_capture_keys = False
if len(self.named_windows) != 0:
has_windows = True
if len(self.capture_keys_windows) != 0:
has_capture_keys = True
if has_windows or has_capture_keys:
wait_key_time = max(1, int(sleep_time*1000) )
ord_key = cv2.waitKeyEx(wait_key_time)
shift_pressed = False
if ord_key != -1:
chr_key = chr(ord_key) if ord_key <= 255 else chr(0)
if chr_key >= 'A' and chr_key <= 'Z':
shift_pressed = True
ord_key += 32
elif chr_key == '?':
shift_pressed = True
ord_key = ord('/')
elif chr_key == '<':
shift_pressed = True
ord_key = ord(',')
elif chr_key == '>':
shift_pressed = True
ord_key = ord('.')
else:
if sleep_time != 0:
time.sleep(sleep_time)
if has_capture_keys and ord_key != -1:
self.add_key_event ( self.focus_wnd_name, ord_key, False, False, shift_pressed)
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