简单介绍C#获取摄像头拍照显示图像的方法

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导读	这篇文章主要为大家详细介绍了 C# 获取摄像头拍照显示图像的方法，文中示例代码介绍的非常详细，具有一定的参考价值，感兴趣的小伙伴们可以参考一下

本文实例为大家分享了 C# 获取摄像头拍照显示图像的具体代码，供大家参考，具体内容如下

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 
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