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
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retval = cv2.waitKey([delay]) |
- Retval:表示返回值;
- Delay:键触发的时间,单位为ms。
3、实例
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import cv2 lena = cv2.imread( "D:\pmjcv\lena.bmp" ) cv2.namedWindow( "lesson" ) cv2.imshow( "lesson" ,lena) key = cv2.waitKey() |
实例扩展:
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# 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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