问题描述
我尝试使用 ZBarSharp 库来检测来自相机的 QRCode 但是当我传递相机名称时，我收到一条错误消息
invalid request: video device not found
这是代码
public void Load(){
// https://stackoverflow.com/a/26159982/12920956
var devices = DsDevice.GetDevicesOfCat(FilterCategory.VideoInputDevice);
var video = new Video();
// the problem here,what is the device name ?!
video.Open(devices[1].Name.ToString());
// Or video.Open(devices[1].ClassID.ToString());
}
我认为问题出在 C# Wrapper 中，但我从 Here
下载了二进制文件并执行
zbarcam.exe "USB2.0_Camera"
我得到了
ERROR: zbar processor in _zbar_video_open():
invalid request: video device not found 'USB2.0_Camera'
λ zbarcam --help
usage: zbarcam [options] [/dev/video?]
scan and decode bar codes from a video stream
options:
-h,--help display this help text
--version display version information and exit
-q,--quiet disable beep when symbol is decoded
-v,--verbose increase debug output level
--verbose=N set specific debug output level
--xml use XML output format
--raw output decoded symbol data without symbology prefix
--nodisplay disable video display window
--prescale=<W>x<H>
request alternate video image size from driver
-S<CONfig>[=<VALUE>],--set <CONfig>[=<VALUE>]
set decoder/scanner <CONfig> to <VALUE> (or 1)
但是当我执行 zbarcam --verbose=32
运行应用程序并获取更多详细信息 ，我得到了
所以，注意 USB2.0_Camera 是否在列表中？
当我选择它并按 OK 时一切正常，
我得到
_zbar_video_open: [0] Microsoft WDM Image Capture (Win32) - Version: 10.0.19041.1
vfw_capture_thread: spawned vfw capture thread (thr=5630)
_zbar_video_open: opened camera: Microsoft WDM Image Capture (Win32) (0) (thr=5530)
vfw_probe: initial format: 640x480 @16bpp (96000) cmp=YUY2(32595559) res=0x0 clr=0/0 (28) (bisz=28)
vfw_probe: probing supported formats:
vfw_probe_format: trying I420(30323449)...
vfw_probe_format: no (set fails)
vfw_probe_format: trying YV12(32315659)...
vfw_probe_format: no (set fails)
vfw_probe_format: trying NV12(3231564e)...
vfw_probe_format: no (set fails)
vfw_probe_format: trying UYVY(59565955)...
vfw_probe_format: no (set fails)
vfw_probe_format: trying YUY2(32595559)...
vfw_probe_format: actual: 640x480 @16bpp (96000) cmp=YUY2(32595559) res=0x0 clr=0/0 (28)
vfw_probe_format: yes
vfw_probe_format: trying BGR3(33524742)...
vfw_probe_format: no (set fails)
vfw_probe_format: trying BGR4(34524742)...
vfw_probe_format: no (set fails)
vfw_probe_format: trying YVU9(39555659)...
vfw_probe_format: no (set fails)
vfw_probe_format: trying GREY(59455247)...
vfw_probe_format: no (set fails)
vfw_probe_format: trying Y800(30303859)...
vfw_probe_format: no (set fails)
vfw_probe_format: trying JPEG(4745504a)...
vfw_probe_format: no (set fails)
WARNING: zbar video in zbar_video_get_fd():
unsupported request: video driver does not support polling
proc_video_thread: spawned video thread
proc_input_thread: spawned input thread
_zbar_best_format: from YUY2(32595559) to BGR3(33524742)=144 BGR4(34524742)=144 JPEG(4745504a)=-1
zbar_negotiate_format: YUY2(32595559) -> BGR3(33524742) (144)
zbar_negotiate_format: setting best format YUY2(32595559) (144)
vfw_set_format: seting format: YUY2(32595559) 640x480 @16bpp (96000) cmp=YUY2(32595559) res=0x0 clr=0/0 (28)
vfw_set_format: set new format: YUY2(32595559) 640x480 @16bpp (96000) cmp=YUY2(32595559) res=0x0 clr=0/0 (28)
vfw_init: initialized video capture: 4 buffers 33333ms/frame
win_handle_event: WM_SIZE 640x480
_zbar_window_resize: 640x480 scale=13
_zbar_process_image: processing: YUY2(32595559) 640x480 @06860008
_zbar_best_format: from YUY2(32595559) to BGR3(33524742)=144 BGR4(34524742)=144 JPEG(4745504a)=-1
zbar_window_redraw: init: src=YUY2(32595559) 0x0 dst=BGR3(33524742) 0x0
_zbar_window_bih_init: biCompression=0 biBitCount=24
zbar_window_redraw: scale: src=640x480 win=640x480 by 480/480 => 640x480 @0,0
_zbar_process_image: processing: YUY2(32595559) 640x480 @06900008
并且二维码检测有效。
但是设备名称是什么，
我试图更多地研究代码 Here，但我在 Windows 上构建此代码时遇到问题 所以调试它来找出设备名称的来源非常复杂
所以，简而言之，我只想知道我应该传递的相机名称的正确格式以使其在 CSharp 和 二进制文件
谢谢。
解决方法
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