halcon查询可用设备及信息

import halcon as ha
Information, ValueList=ha.info_framegrabber ('DirectShow',
                                          'device', )
"""
Default value: 'info_boards'
List of values: 'bits_per_channel', 'camera_type', 'color_space',
'defaults', 'device', 'external_trigger', 'field', 'general', 
'generic', 'horizontal_resolution', 'image_height', 'image_width', 
'info_boards', 'parameters', 'parameters_readonly',
 'parameters_writeonly', 'port', 'revision', 'start_column',
  'start_row', 'vertical_resolution'
"""
deviceList=['[0] KS861', '[1] ASUS 5M WebCam', ('[2] Camera (''NVIDIA ''Broadcast)')]