halcon采集一幅图像

**顺序也很重要，必须现有窗口，才能设置属性

dev_close_window()
dev_open_window (0, 0, 1400, 1200, 'black', WindowHandle)
dev_set_draw ('margin')
dev_set_color('green')
dev_set_line_width(5)
dev_update_window('off')
* Image Acquisition 01: Code generated by Image Acquisition 01
open_framegrabber ('DahengCAM', 1, 1, 0, 0, 0, 0, 'interlaced', 8, 'rgb', -1, 'false', 'SV-xxxx', '1', 1, -1, AcqHandle)
grab_image_start (AcqHandle, -1)
** 必须是2行，第一行不出结果（是黑色图像）
grab_image_async (Image, AcqHandle, -1)
grab_image_async (Image, AcqHandle, -1)
* Image Acquisition 01: Do something

create_bar_code_model ([], [], BarCodeHandle)
find_bar_code (Image, SymbolRegions, BarCodeHandle, 'Code 128', DecodedDataStrings)

dev_display (Image)
dev_display (SymbolRegions)
if(|DecodedDataStrings|>0)
set_tposition (WindowHandle, 24, 12)
write_string (WindowHandle, DecodedDataStrings)
endif

close_framegrabber (AcqHandle)
clear_bar_code_model (BarCodeHandle)