簡單介紹C#獲取攝像頭拍照顯示影像的方法

導讀	這篇文章主要為大家詳細介紹了C#獲取攝像頭拍照顯示影像的方法，文中示例程式碼介紹的非常詳細，具有一定的參考價值，感興趣的小夥伴們可以參考一下

本文例項為大家分享了C#獲取攝像頭拍照顯示影像的具體程式碼，供大家參考，具體內容如下

之前有個需求，就是在web介面可以實現呼叫攝像頭，使用者把手機的個人二維碼展示給攝像頭，攝像頭進行攝像識別使用者。

其實本質就是儲存影像二維碼，在進行二維碼識別。

下面來看看如何實現。

/// < summary>
        /// 初始化攝像頭
        /// < /summary>
        /// < param name="handle">控制元件的控制程式碼
        /// < param name="left">開始顯示的左邊距
        /// < param name="top">開始顯示的上邊距
        /// < param name="width">要顯示的寬度
        /// < param name="height">要顯示的長度
        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);

/// < summary>
        /// 開始顯示影像
        /// < /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">要儲存bmp檔案的路徑
        public void GrabImage(string path)
        { 
            IntPtr hBmp = Marshal.StringToHGlobalAnsi(path);
            SendMessage(hWndC, WM_CAP_SAVEDIB, 0, hBmp.ToInt64());
        }  
        /// < summary>
        /// 錄影
        /// < /summary>
        /// < param name="path">要儲存avi檔案的路徑
        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>
        /// 停止錄影
        /// < /summary>
        public void StopKinescope()
        {
            SendMessage(hWndC, WM_CAP_STOP, 0, 0);
 }

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">控制元件的控制程式碼
        /// < param name="left">開始顯示的左邊距
        /// < param name="top">開始顯示的上邊距
        /// < param name="width">要顯示的寬度
        /// < param name="height">要顯示的長度
        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);
  
        /// < summary>
        /// 開始顯示影像
        /// < /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">要儲存bmp檔案的路徑
        public void GrabImage(string path)
{
  
  
            IntPtr hBmp = Marshal.StringToHGlobalAnsi(path);
            SendMessage(hWndC, WM_CAP_SAVEDIB, 0, hBmp.ToInt64());
  
  
        }
 
        /// < summary>
        /// 錄影
        /// < /summary>
        /// < param name="path">要儲存avi檔案的路徑
        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>
        /// 停止錄影
        /// < /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();
    }
  
  
}

以上就是本文的全部內容，希望對大家的學習有所幫助。

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