C#获取摄像头拍照显示图像
dotNET跨平台 今天
以下文章来源于后端Q ，作者conan
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
/// <summary>/// 初始化摄像头/// </summary>/// <param name="handle">控件的句柄</param>/// <param name="left">开始显示的左边距</param>/// <param name="top">开始显示的上边距</param>/// <param name="width">要显示的宽度</param>/// <param name="height">要显示的长度</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、开始显示图像
/// <summary>/// 开始显示图像/// </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、停止显示
/// <summary>/// 停止显示/// </summary>public void Stop(){SendMessage(hWndC, WM_CAP_DRIVER_DISCONNECT, 0, 0);bStat = false;}
4、抓图
/// <summary>/// 抓图/// </summary>/// <param name="path">要保存bmp文件的路径</param>public void GrabImage(string path){IntPtr hBmp = Marshal.StringToHGlobalAnsi(path);SendMessage(hWndC, WM_CAP_SAVEDIB, 0, hBmp.ToInt64());}/// <summary>/// 录像/// </summary>/// <param name="path">要保存avi文件的路径</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>/// 停止录像/// </summary>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);/// <summary>/// 一个控制摄像头的类/// </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>/// 初始化摄像头/// </summary>/// <param name="handle">控件的句柄</param>/// <param name="left">开始显示的左边距</param>/// <param name="top">开始显示的上边距</param>/// <param name="width">要显示的宽度</param>/// <param name="height">要显示的长度</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>/// 开始显示图像/// </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>/// 停止显示/// </summary>public void Stop(){SendMessage(hWndC, WM_CAP_DRIVER_DISCONNECT, 0, 0);bStat = false;}/// <summary>/// 抓图/// </summary>/// <param name="path">要保存bmp文件的路径</param>public void GrabImage(string path){IntPtr hBmp = Marshal.StringToHGlobalAnsi(path);SendMessage(hWndC, WM_CAP_SAVEDIB, 0, hBmp.ToInt64());}/// <summary>/// 录像/// </summary>/// <param name="path">要保存avi文件的路径</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>/// 停止录像/// </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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