C#怎么获取摄像头拍照显示图像

本篇内容主要讲解"C#怎么获取摄像头拍照显示图像"，感兴趣的朋友不妨来看看。本文介绍的方法操作简单快捷，实用性强。下面就让小编来带大家学习"C#怎么获取摄像头拍照显示图像"吧!

概述

之前有个需求，就是在web界面可以实现调用摄像头，用户把手机的个人二维码展示给摄像头，摄像头进行摄像识别用户。

其实本质就是保存图像二维码，在进行二维码识别。

下面来看看如何实现。

主要代码实现

1、初始化摄像头

/// 
        /// 初始化摄像头        /// 
        /// 控件的句柄        /// 开始显示的左边距        /// 开始显示的上边距        /// 要显示的宽度        /// 要显示的长度        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、开始显示图像

/// 
        /// 开始显示图像        /// 
        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、停止显示

  /// 
        /// 停止显示        /// 
        public void Stop()        {            SendMessage(hWndC, WM_CAP_DRIVER_DISCONNECT, 0, 0);            bStat = false;}

4、抓图

 /// 
        /// 抓图        /// 
        /// 要保存bmp文件的路径        public void GrabImage(string path)        {             IntPtr hBmp = Marshal.StringToHGlobalAnsi(path);            SendMessage(hWndC, WM_CAP_SAVEDIB, 0, hBmp.ToInt64());        }          /// 
        /// 录像        /// 
        /// 要保存avi文件的路径        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);        }          /// 
        /// 停止录像        /// 
        public void StopKinescope()        {            SendMessage(hWndC, WM_CAP_STOP, 0, 0); }

完整代码

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);    /// 
    /// 一个控制摄像头的类    /// 
    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;        /// 
        /// 初始化摄像头        /// 
        /// 控件的句柄        /// 开始显示的左边距        /// 开始显示的上边距        /// 要显示的宽度        /// 要显示的长度        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);         /// 
        /// 开始显示图像        /// 
        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;         }  /// 
/// 停止显示/// 
public void Stop(){            SendMessage(hWndC, WM_CAP_DRIVER_DISCONNECT, 0, 0);            bStat = false;        }        /// 
        /// 抓图        /// 
        /// 要保存bmp文件的路径        public void GrabImage(string path){              IntPtr hBmp = Marshal.StringToHGlobalAnsi(path);            SendMessage(hWndC, WM_CAP_SAVEDIB, 0, hBmp.ToInt64());          }        /// 
        /// 录像        /// 
        /// 要保存avi文件的路径        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);        }        /// 
        /// 停止录像        /// 
        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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