概述

之前有個需求，就是在web界面可以實現調用攝像頭，用戶把手機的個人二維碼展示給攝像頭，攝像頭進行攝像識別用戶。

其實本質就是保存圖像二維碼，在進行二維碼識別。

下面來看看如何實現。

主要代碼實現

1、初始化攝像頭

/// <summary>/// 初始化攝像頭/// </summary>/// <param name="handle">控件的句柄</param>/// <param name="left">開始顯示的左邊距</param>/// <param name="top">開始顯示的上邊距</param>/// <param name="width">要顯示的寬度</param>/// <param name="height">要顯示的長度</param>public Pick(IntPtr handle, int left, int top, int width, int height){mControlPtr = handle;mWidth = width;mHeight = height;mLeft = left;mTop = top;}[DllImport("avicap32.dll")]private static extern IntPtr capCreateCaptureWindowA(byte[] lpszWindowName, int dwStyle, int x, int y, int nWidth, int nHeight, IntPtr hWndParent, int nID);[DllImport("avicap32.dll")]private static extern int capGetVideoFormat(IntPtr hWnd, IntPtr psVideoFormat, int wSize);[DllImport("User32.dll")]private static extern bool SendMessage(IntPtr hWnd, int wMsg, int wParam, long lParam);

2、開始顯示圖像

/// <summary>/// 開始顯示圖像/// </summary>public void Start(){if (bStat)return;bStat = true;byte[] lpszName = new byte[100];hWndC = capCreateCaptureWindowA(lpszName, WS_CHILD | WS_VISIBLE, mLeft, mTop, mWidth, mHeight, mControlPtr, 0);if (hWndC.ToInt32() != 0){SendMessage(hWndC, WM_CAP_SET_CALLBACK_VIDEOSTREAM, 0, 0);SendMessage(hWndC, WM_CAP_SET_CALLBACK_ERROR, 0, 0);SendMessage(hWndC, WM_CAP_SET_CALLBACK_STATUSA, 0, 0);SendMessage(hWndC, WM_CAP_DRIVER_CONNECT, 0, 0);SendMessage(hWndC, WM_CAP_SET_SCALE, 1, 0);SendMessage(hWndC, WM_CAP_SET_PREVIEWRATE, 66, 0);SendMessage(hWndC, WM_CAP_SET_OVERLAY, 1, 0);SendMessage(hWndC, WM_CAP_SET_PREVIEW, 1, 0);}return;}

3、停止顯示

/// <summary>/// 停止顯示/// </summary>public void Stop(){SendMessage(hWndC, WM_CAP_DRIVER_DISCONNECT, 0, 0);bStat = false;}

4、抓圖

/// <summary>/// 抓圖/// </summary>/// <param name="path">要保存bmp文件的路徑</param>public void GrabImage(string path){IntPtr hBmp = Marshal.StringToHGlobalAnsi(path);SendMessage(hWndC, WM_CAP_SAVEDIB, 0, hBmp.ToInt64());}/// <summary>/// 錄像/// </summary>/// <param name="path">要保存avi文件的路徑</param>public void Kinescope(string path){IntPtr hBmp = Marshal.StringToHGlobalAnsi(path);SendMessage(hWndC, WM_CAP_FILE_SET_CAPTURE_FILEA, 0, hBmp.ToInt64());SendMessage(hWndC, WM_CAP_SEQUENCE, 0, 0);}/// <summary>/// 停止錄像/// </summary>public void StopKinescope(){SendMessage(hWndC, WM_CAP_STOP, 0, 0);}

完整代碼

using System; using System.Collections; using System.Configuration; using System.Data; using System.Linq; using System.Web; using System.Web.Security; using System.Web.UI; using System.Web.UI.HtmlControls; using System.Web.UI.WebControls; using System.Web.UI.WebControls.WebParts; using System.Xml.Linq; using System.Windows.Forms;using System.Runtime.InteropServices;using com.google.zxing.qrcode.decoder; using com.google.zxing.client; using com.google.zxing.common;using System.Threading;public partial class Decode : System.Web.UI.Page {// public delegate void SaveImg(Pick Pick1);/// <summary>/// 一個控制攝像頭的類/// </summary>public class Pick{private const int WM_USER = 0x400;private const int WS_CHILD = 0x40000000;private const int WS_VISIBLE = 0x10000000;private const int WM_CAP_START = WM_USER;private const int WM_CAP_STOP = WM_CAP_START + 68;private const int WM_CAP_DRIVER_CONNECT = WM_CAP_START + 10;private const int WM_CAP_DRIVER_DISCONNECT = WM_CAP_START + 11;private const int WM_CAP_SAVEDIB = WM_CAP_START + 25;private const int WM_CAP_GRAB_FRAME = WM_CAP_START + 60;private const int WM_CAP_SEQUENCE = WM_CAP_START + 62;private const int WM_CAP_FILE_SET_CAPTURE_FILEA = WM_CAP_START + 20;private const int WM_CAP_SEQUENCE_NOFILE = WM_CAP_START + 63;private const int WM_CAP_SET_OVERLAY = WM_CAP_START + 51;private const int WM_CAP_SET_PREVIEW = WM_CAP_START + 50;private const int WM_CAP_SET_CALLBACK_VIDEOSTREAM = WM_CAP_START + 6;private const int WM_CAP_SET_CALLBACK_ERROR = WM_CAP_START + 2;private const int WM_CAP_SET_CALLBACK_STATUSA = WM_CAP_START + 3;private const int WM_CAP_SET_CALLBACK_FRAME = WM_CAP_START + 5;private const int WM_CAP_SET_SCALE = WM_CAP_START + 53;private const int WM_CAP_SET_PREVIEWRATE = WM_CAP_START + 52;private IntPtr hWndC;private bool bStat = false;private IntPtr mControlPtr;private int mWidth;private int mHeight;private int mLeft;private int mTop;/// <summary>/// 初始化攝像頭/// </summary>/// <param name="handle">控件的句柄</param>/// <param name="left">開始顯示的左邊距</param>/// <param name="top">開始顯示的上邊距</param>/// <param name="width">要顯示的寬度</param>/// <param name="height">要顯示的長度</param>public Pick(IntPtr handle, int left, int top, int width, int height) {mControlPtr = handle;mWidth = width;mHeight = height;mLeft = left;mTop = top;}[DllImport("avicap32.dll")]private static extern IntPtr capCreateCaptureWindowA(byte[] lpszWindowName, int dwStyle, int x, int y, int nWidth, int nHeight, IntPtr hWndParent, int nID);[DllImport("avicap32.dll")]private static extern int capGetVideoFormat(IntPtr hWnd, IntPtr psVideoFormat, int wSize);[DllImport("User32.dll")]private static extern bool SendMessage(IntPtr hWnd, int wMsg, int wParam, long lParam);/// <summary>/// 開始顯示圖像/// </summary>public void Start() {if (bStat)return;bStat = true;byte[] lpszName = new byte[100];hWndC = capCreateCaptureWindowA(lpszName, WS_CHILD | WS_VISIBLE, mLeft, mTop, mWidth, mHeight, mControlPtr, 0);if (hWndC.ToInt32() != 0){SendMessage(hWndC, WM_CAP_SET_CALLBACK_VIDEOSTREAM, 0, 0);SendMessage(hWndC, WM_CAP_SET_CALLBACK_ERROR, 0, 0);SendMessage(hWndC, WM_CAP_SET_CALLBACK_STATUSA, 0, 0);SendMessage(hWndC, WM_CAP_DRIVER_CONNECT, 0, 0);SendMessage(hWndC, WM_CAP_SET_SCALE, 1, 0);SendMessage(hWndC, WM_CAP_SET_PREVIEWRATE, 66, 0);SendMessage(hWndC, WM_CAP_SET_OVERLAY, 1, 0);SendMessage(hWndC, WM_CAP_SET_PREVIEW, 1, 0);}return;}/// <summary>/// 停止顯示/// </summary>public void Stop() {SendMessage(hWndC, WM_CAP_DRIVER_DISCONNECT, 0, 0);bStat = false;}/// <summary>/// 抓圖/// </summary>/// <param name="path">要保存bmp文件的路徑</param>public void GrabImage(string path) {IntPtr hBmp = Marshal.StringToHGlobalAnsi(path);SendMessage(hWndC, WM_CAP_SAVEDIB, 0, hBmp.ToInt64());}/// <summary>/// 錄像/// </summary>/// <param name="path">要保存avi文件的路徑</param>public void Kinescope(string path) {IntPtr hBmp = Marshal.StringToHGlobalAnsi(path);SendMessage(hWndC, WM_CAP_FILE_SET_CAPTURE_FILEA, 0, hBmp.ToInt64());SendMessage(hWndC, WM_CAP_SEQUENCE, 0, 0);}/// <summary>/// 停止錄像/// </summary>public void StopKinescope() {SendMessage(hWndC, WM_CAP_STOP, 0, 0);}}protected void Page_Load(object sender, EventArgs e) {}//void DoInit()//{// System.Windows.Forms.Form frm = new Form();// frm.Height = 300;// frm.Width = 300;// System.Windows.Forms.PictureBox Panel = new System.Windows.Forms.PictureBox();// Panel.Height = 300;// Panel.Width = 300;// Panel.Visible = true;// Panel.BackgroundImageLayout = ImageLayout.None;// frm.Controls.Add(Panel);// frm.TopMost = true;// Pick p = new Pick(Panel.Handle, 0, 0, 300, 300);// p.Start();// frm.Show();// p.Kinescope(Server.MapPath("img\\Decode2.avi"));// p.GrabImage(Server.MapPath("img\\Decode1.bmp"));// p.Stop();// frm.Close();// frm.Dispose();//}private void getQrcode() {try{//ThreadStart worker = new ThreadStart(DoInit);//Thread th = new Thread(worker);//th.IsBackground = true;//th.Start();System.Windows.Forms.Form frm = new Form();frm.Height = 300;frm.Width = 300;System.Windows.Forms.PictureBox Panel = new System.Windows.Forms.PictureBox();Panel.Height = 300;Panel.Width = 300;Panel.Visible = true;Panel.BackgroundImageLayout = ImageLayout.None;frm.Controls.Add(Panel);frm.TopMost = true;Pick p = new Pick(Panel.Handle, 0, 0, 300, 300);p.Start();int i = 1;while (i <= 1){p.GrabImage(Server.MapPath("img\\Decode.bmp"));p.Kinescope(Server.MapPath("img\\Video.avi"));i++;}p.Stop();frm.Close();frm.Dispose();try{com.google.zxing.qrcode.QRCodeReader d = new com.google.zxing.qrcode.QRCodeReader();RGBLuminanceSource rg = new RGBLuminanceSource(new System.Drawing.Bitmap(Server.MapPath("img\\Decode.bmp")), new System.Drawing.Bitmap(Server.MapPath("img\\Decode.bmp")).Width, new System.Drawing.Bitmap(Server.MapPath("img\\Decode.bmp")).Height);com.google.zxing.LuminanceSource ls = rg;HybridBinarizer hb = new HybridBinarizer(ls);com.google.zxing.BinaryBitmap bm = new com.google.zxing.BinaryBitmap(hb);com.google.zxing.Result r = d.decode(bm);TextBox1.Text = r.Text;}catch (Exception ex){TextBox1.Text = "";//MessageBox.Show(ex.Message+"111");throw new Exception(ex.Message);}}catch (Exception ee){ee.ToString();}}protected void Timer1_Tick(object sender, EventArgs e) {//getQrcode();}protected void Button1_Click(object sender, EventArgs e) {getQrcode();}}

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