前言
最近在整理一些自己写过的东西,也算是重新熟悉一下并且优化一下吧。
需求:获取本地USB摄像头视频显示,并且获取图片数据给底层做人脸识别。
记得当时直接采用H5已经做好了,调试好了。。。。结果放上去使用发现必须需要证书才可以,
然后因为某些原因(没办法自己写一个ssl证书)只能重写了一个之前使用Activex做的USB控件。
H5调用USB摄像头参考:https://segmentfault.com/a/1190000011793960
开发
闲话:DLL缺少搜索找不到,推荐找dll https://www.zhaodll.com/
引用:AForge.dll,AForge.Video.DirectShow.dll,AForge.Video.dll
首先创建一个用户控件>放入一个pictureBox1>放入一个lable
将用户控件调成灰色(明显。。。)大小随便后面可以调整,pictureBox1在父容器停靠,lab用于错误提示,效果如下:
添加一个 IObjectSafety 接口。
/* IObjectSafety 接口用于通知浏览器:“浏览器,我是安全的” */ [ComImport, Guid("887FC3C3-A970-4A36-92EF-D4EB31541C40")] [InterfaceTypeAttribute(ComInterfaceType.InterfaceIsIUnknown)] public interface IObjectSafety { [PreserveSig] int GetInterfaceSafetyOptions(ref Guid riid, [MarshalAs(UnmanagedType.U4)] ref int pdwSupportedOptions, [MarshalAs(UnmanagedType.U4)] ref int pdwEnabledOptions); [PreserveSig()] int SetInterfaceSafetyOptions(ref Guid riid, [MarshalAs(UnmanagedType.U4)] int dwOptionSetMask, [MarshalAs(UnmanagedType.U4)] int dwEnabledOptions); }
添加一个基础类,用于数据返回处理。
public class USBInfo { /// <summary> /// 返回消息 /// </summary> public class ReturnMessage { public bool result { get; set; }//结果 public string message { get; set; }//消息 } /// <summary> /// 返回视频分辨率 /// </summary> public class GetResolvingPower { public int index { get; set; }//下标 -1(不存在摄像头),-2(发生意外错误) public VideoCapabilities Capabilities { get; set; }//信息 public string error { get; set; }//错误 } }
用户控件中实现:
/// <summary> /// 继承IObjectSafety /// </summary> [ProgId("USBCamera")] [ClassInterface(ClassInterfaceType.AutoDual)] [Guid("887FC3C3-A970-4A36-92EF-D4EB31541C40")] [ComVisible(true)] public partial class USBCamera : UserControl, IObjectSafety { FilterInfoCollection videoDevices;//设备 VideoCaptureDevice videoSource;//设备信息 MemoryStream frameData;//图片数据 static Thread th_usb;//监听线程 static int sl_usb = 10000;//多久检查一次 static int index_usb;//第一次打开选择的分辨率 public USBCamera() { InitializeComponent(); frameData = new MemoryStream(); } //句柄销毁 protected override void OnHandleDestroyed(EventArgs e) { Stop(); base.OnHandleDestroyed(e); } /// <summary> /// 设置窗体相关大小 /// </summary> /// <param name="width">宽</param> /// <param name="height">高</param> /// <param name="fontformat">字体熟悉</param> /// <param name="fontsize">字体大小</param> /// <param name="promptInfo">提示信息</param> /// <param name="sleep">监听间隔</param> public void FormSize(int width, int height, string fontFormat, int fontSize, string promptInfo, int sleep) { this.Size = new Size(width, height);//窗体大小 this.lab_Prompt.Font = new Font(fontFormat, fontSize, FontStyle.Bold); //字体熟悉 this.lab_Prompt.ForeColor = Color.Red;//字体颜色 this.lab_Prompt.Text = promptInfo;//提示信息 //设置字体高宽 var lab_width = (width / 3); var lab_height = (height / 3); this.lab_Prompt.Location = new System.Drawing.Point(lab_width, lab_height); sl_usb = sleep;//监听时间 } /// <summary> /// 打开视频 /// </summary> /// <param name="index">USB可用分辨率数组下标</param> public void Start(int index) { index_usb = index; if (videoSource != null) { videoSource.NewFrame -= new NewFrameEventHandler(video_NewFrame); videoSource.SignalToStop(); videoSource = null; } // 创建视频源 Trace.WriteLine("usbcamera have cameras" + videoDevices.Count.ToString()); videoSource = new VideoCaptureDevice(videoDevices[0].MonikerString); // 设置新帧事件处理程序 videoSource.NewFrame += new NewFrameEventHandler(video_NewFrame); // 启动视频源 try { videoSource.VideoResolution = this.videoSource.VideoCapabilities[index]; videoSource.Start(); if (th_usb == null || !th_usb.IsAlive) { th_usb = new Thread(GetUSB); th_usb.Start(); } this.lab_Prompt.Text = null; } catch (Exception ex) { Trace.WriteLine("usbcamera Start()遇到错误" + ex.Message + ex.StackTrace); } } /// <summary> /// 停止视频 /// </summary> public void Stop() { if (videoSource != null) { videoSource.NewFrame -= new NewFrameEventHandler(video_NewFrame); //当不再需要捕捉时,发出停止的信号 videoSource.SignalToStop(); videoSource = null; Trace.WriteLine("usbcamera stop()...."); if (pictureBox1.Image != null)//清空控件 { pictureBox1.Image.Dispose(); pictureBox1.Image = null; } this.lab_Prompt.Text = null; } } /// <summary> /// 视频帧获取回调 /// </summary> /// <param name="sender"></param> /// <param name="eventArgs"></param> private void video_NewFrame(object sender, NewFrameEventArgs eventArgs) { try { lab_Prompt.Text = null; Trace.WriteLine("usbcamera video_NewFrame()...."); eventArgs.Frame.Save(frameData, ImageFormat.Bmp); if (pictureBox1.InvokeRequired) { //写入数据 pictureBox1.BeginInvoke((MethodInvoker)delegate () { try { if (pictureBox1.Image != null) { Image img = pictureBox1.Image; img.Dispose(); } pictureBox1.Image = new Bitmap(frameData); } catch (Exception ex) { if (pictureBox1.Image != null) { pictureBox1.Image.Dispose(); pictureBox1.Image = null; } } }); } else { pictureBox1.Image = new Bitmap(frameData); } } catch (Exception ex) { if (pictureBox1.Image != null) { pictureBox1.Image.Dispose(); pictureBox1.Image = null; } } } /// <summary> /// 获取USB(USB连接不正常),不存在给出提示,存在重新Start /// </summary> public void GetUSB() { while (true) { var usb = new FilterInfoCollection(FilterCategory.VideoInputDevice); if (usb.Count <= 0) { Stop(); lab_Prompt.BeginInvoke((MethodInvoker)delegate () { this.lab_Prompt.Text = "未连接上摄像头,检查连接是否正常。"; }); } else { //重新连接上 执行Start if (!string.IsNullOrWhiteSpace(this.lab_Prompt.Text)) { Start(index_usb); } } Thread.Sleep(sl_usb); } } #region USB视频操作 /// <summary> /// 测试Activex是否可用 /// </summary> /// <returns>true/false</returns> public bool Connection() { return true; } /// <summary> /// 获取截图 /// </summary> /// <returns></returns> public ReturnMessage GetScreenshots() { try { return new ReturnMessage() { result = true, message = Convert.ToBase64String(frameData.ToArray()) }; } catch (Exception EX) { Trace.WriteLine("usbcamera GetImage() 错误...." + EX.Message + EX.StackTrace); return new ReturnMessage() { result = false, message = EX.Message + " " + EX.StackTrace }; } } /// <summary> /// 获取USB摄像头分辨率 /// </summary> /// <returns>json(GetResolvingPower)</returns> public string GetResolution() { var list = new List<GetResolvingPower>(); try { videoDevices = new FilterInfoCollection(FilterCategory.VideoInputDevice); if (videoDevices.Count > 0) { videoSource = new VideoCaptureDevice(videoDevices[0].MonikerString); for (int i = 0; i < videoSource.VideoCapabilities.Length; i++) { list.Add(new GetResolvingPower { index = i, Capabilities = videoSource.VideoCapabilities[i], }); } } else { list.Add(new GetResolvingPower { index = -1, Capabilities = null, error = "不存在USB摄像头", }); } } catch (Exception EX) { list.Add(new GetResolvingPower { index = -2, Capabilities = null, error = EX.Source + " " + EX.Message }); } return Newtonsoft.Json.JsonConvert.SerializeObject(list); } #endregion #region IObjectSafety 成员直接复制 private const string _IID_IDispatch = "{00020400-0000-0000-C000-000000000046}"; private const string _IID_IDispatchEx = "{a6ef9860-c720-11d0-9337-00a0c90dcaa9}"; private const string _IID_IPersistStorage = "{0000010A-0000-0000-C000-000000000046}"; private const string _IID_IPersistStream = "{00000109-0000-0000-C000-000000000046}"; private const string _IID_IPersistPropertyBag = "{37D84F60-42CB-11CE-8135-00AA004BB851}"; private const int INTERFACESAFE_FOR_UNTRUSTED_CALLER = 0x00000001; private const int INTERFACESAFE_FOR_UNTRUSTED_DATA = 0x00000002; private const int S_OK = 0; private const int E_FAIL = unchecked((int)0x80004005); private const int E_NOINTERFACE = unchecked((int)0x80004002); private bool _fSafeForScripting = true; private bool _fSafeForInitializing = true; public int GetInterfaceSafetyOptions(ref Guid riid, ref int pdwSupportedOptions, ref int pdwEnabledOptions) { int Rslt = E_FAIL; string strGUID = riid.ToString("B"); pdwSupportedOptions = INTERFACESAFE_FOR_UNTRUSTED_CALLER | INTERFACESAFE_FOR_UNTRUSTED_DATA; switch (strGUID) { case _IID_IDispatch: case _IID_IDispatchEx: Rslt = S_OK; pdwEnabledOptions = 0; if (_fSafeForScripting == true) pdwEnabledOptions = INTERFACESAFE_FOR_UNTRUSTED_CALLER; break; case _IID_IPersistStorage: case _IID_IPersistStream: case _IID_IPersistPropertyBag: Rslt = S_OK; pdwEnabledOptions = 0; if (_fSafeForInitializing == true) pdwEnabledOptions = INTERFACESAFE_FOR_UNTRUSTED_DATA; break; default: Rslt = E_NOINTERFACE; break; } return Rslt; } public int SetInterfaceSafetyOptions(ref Guid riid, int dwOptionSetMask, int dwEnabledOptions) { int Rslt = E_FAIL; string strGUID = riid.ToString("B"); switch (strGUID) { case _IID_IDispatch: case _IID_IDispatchEx: if (((dwEnabledOptions & dwOptionSetMask) == INTERFACESAFE_FOR_UNTRUSTED_CALLER) && (_fSafeForScripting == true)) Rslt = S_OK; break; case _IID_IPersistStorage: case _IID_IPersistStream: case _IID_IPersistPropertyBag: if (((dwEnabledOptions & dwOptionSetMask) == INTERFACESAFE_FOR_UNTRUSTED_DATA) && (_fSafeForInitializing == true)) Rslt = S_OK; break; default: Rslt = E_NOINTERFACE; break; } return Rslt; } #endregion }
用于测试的HTML页面代码:
<!DOCTYPE html> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <title></title> <meta charset="utf-8" /> <script> //初始化 设置USB控件大小和显示 var array = new Array(); window.onload = function () { var USBCamera = document.getElementById("USBCamera"); USBCamera.Stop(); //停止视频 array = JSON.parse(document.getElementById("USBCamera").GetResolution());//获取USB分辨率 /* 判断获取数据是否成功(USB连接是否正常) 大于1为成功,摄像头基本有多个分辨率 也可以判断返回值中index是否为负数 获取到的分辨率最大的为第一个下标为:0 */ if (array.length > 1) { //分辨率下标 宽 高 var index = 0, width = 0, height = 0; for (var i = 0; i < array.length; i++) { var size = array[i].Capabilities.FrameSize; if (size.Width > width && size.Height > height) { index = i; width = size.Width; height = size.Height; } } //此处我获取分辨率的最大值赋值,实际可以更改 USBCamera.FormSize(width, height, "宋体", 9, "", 10000);//初始化 USBCamera.Start(index);//打开摄像头 } else { if (array[0].index == -1) { //-1未连接 USBCamera.FromSize(400, 400, "宋体", 9, "摄像头未连接", 10000); } if (array[0].index == -2) { //-2 获取是发生错误 USBCamera.FromSize(400, 400, "宋体", 9, "摄像头连接有异常,请联系管理人员!", 10000); } } } //关闭时执行Stop window.BeforeUnloadEvent = function () { document.getElementById("USBCamera").Stop(); } //测试连接 function TestConnection() { alert(document.getElementById("USBCamera").Connection()); } //打开摄像头 function StartCamera() { document.getElementById("USBCamera").Start(0); } //关闭摄像头 function StopCamera() { document.getElementById("USBCamera").Stop(); } //获取截图 function GetScreenshots() { var imgInfo = document.getElementById("USBCamera").GetScreenshots(); if (imgInfo.result) { document.getElementById("DisplayScreenshots").src = "data:image/jpg;base64," + imgInfo.message; } else { alert("截图获取失败"); } } //获取分辨率 function GetResolution() { console.log(document.getElementById("USBCamera").GetResolution()); } </script> </head> <body> <div> <button onclick="TestConnection()">测试连接</button> <button onclick="StartCamera()">打开摄像头</button> <button onclick="StopCamera()">关闭摄像头</button> <button onclick="GetScreenshots()">获取截图</button> <button onclick="GetResolution()">获取分辨率</button> </div> <hr /> <h3>截图显示</h3> <img style="width:300px;height:300px;" id="DisplayScreenshots" /> <div style="float:right;width:70%"> <object id="USBCamera" classid="clsid:887FC3C3-A970-4A36-92EF-D4EB31541C40"> <div class="alert alert-danger">视频控件载入失败!如未安装,请<a href="InstallationPackage/Setup1.msi">下载安装</a>。</div> </object> </div> </body> </html>
实现的效果图:
结语
VS使用的2015社区版,社区版。。。有点尴尬所以打包使用的 Visual Studio Installer
一回生二回熟,第一次写这个满脸蒙蔽。
不过这次稍微整理了一下,改动了一点,后续准备找个人脸识别的开源接口融合进来。
下面给个下载地址,可以直接调试,需要注意使用IE,由于没有加证书,IE需要设置。
工具>Internet选项
>安全>加入受信任的站点>
>自定义级别>ActiveX控件和插件>ActivexX控件自动提示>启用
>对未标记为可安全执行的脚本的ActivexX控件初始化并执行脚本>启用
百度云盘链接:下载
原文地址:https://www.cnblogs.com/psjinfo/p/10436127.html
时间: 2024-10-07 01:46:49