C#使用摄像头拍照

最新推荐文章于 2020-11-30 13:27:15 发布

malongning

最新推荐文章于 2020-11-30 13:27:15 发布

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分类专栏： c# 文章标签： c# image string object components callback

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本文介绍了一个使用C#实现摄像头视频流捕获并保存图像的例子。通过调用avicap32.dll等库文件，实现了视频窗口的创建、视频流的获取以及图像的保存功能。

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using System;
using System.Drawing;
using System.Collections;
using System.ComponentModel;
using System.Windows.Forms;
using System.Data;
using System.Runtime.InteropServices;
using System.Drawing.Imaging;

namespace webcam
{
    public partial class Form2 : Form
    {
        private int hHwnd;
        public Form2()
        {
            InitializeComponent();
        }
        public struct videohdr_tag
        {
            public byte[] lpData;
            public int dwBufferLength;
            public int dwBytesUsed;
            public int dwTimeCaptured;
            public int dwUser;
            public int dwFlags;
            public int[] dwReserved;

        }
        public delegate bool CallBack(int hwnd, int lParam);
        ///   <summary>
        ///   必需的设计器变量。
        ///   </summary>
        //private System.ComponentModel.Container components = null;
        [DllImport("avicap32.dll", CharSet = CharSet.Ansi, SetLastError = true, ExactSpelling = true)]
        public static extern int capCreateCaptureWindowA([MarshalAs(UnmanagedType.VBByRefStr)]   ref   string lpszWindowName, int dwStyle, int x, int y, int nWidth, short nHeight, int hWndParent, int nID);
        [DllImport("avicap32.dll", CharSet = CharSet.Ansi, SetLastError = true, ExactSpelling = true)]
        public static extern bool capGetDriverDescriptionA(short wDriver, [MarshalAs(UnmanagedType.VBByRefStr)]   ref   string lpszName, int cbName, [MarshalAs(UnmanagedType.VBByRefStr)]   ref   string lpszVer, int cbVer);
        [DllImport("user32", CharSet = CharSet.Ansi, SetLastError = true, ExactSpelling = true)]
        public static extern bool DestroyWindow(int hndw);
        [DllImport("user32", EntryPoint = "SendMessageA", CharSet = CharSet.Ansi, SetLastError = true, ExactSpelling = true)]
        public static extern int SendMessage(int hwnd, int wMsg, int wParam, [MarshalAs(UnmanagedType.AsAny)]   object lParam);
        [DllImport("user32", CharSet = CharSet.Ansi, SetLastError = true, ExactSpelling = true)]
        public static extern int SetWindowPos(int hwnd, int hWndInsertAfter, int x, int y, int cx, int cy, int wFlags);
        [DllImport("vfw32.dll")]
        public static extern string capVideoStreamCallback(int hwnd, videohdr_tag videohdr_tag);
        [DllImport("vicap32.dll", CharSet = CharSet.Ansi, SetLastError = true, ExactSpelling = true)]
        public static extern bool capSetCallbackOnFrame(int hwnd, string s);

private void OpenCapture()
{

            int intWidth = this.panel_Vedio.Width;
            int intHeight = this.panel_Vedio.Height;
            int intDevice = 0;
            string refDevice = intDevice.ToString();
            hHwnd = Form2.capCreateCaptureWindowA(ref   refDevice, 1342177280, 0, 0, 640, 480, this.panel_Vedio.Handle.ToInt32(), 0);
            this.LbSysMsg.Text = "";
            this.LbSysMsg.Text += "驱动:" + refDevice;
            if (Form2.SendMessage(hHwnd, 0x40a, intDevice, 0) > 0)
            {
                Form2.SendMessage(this.hHwnd, 0x435, -1, 0);
                Form2.SendMessage(this.hHwnd, 0x434, 0x42, 0);
                Form2.SendMessage(this.hHwnd, 0x432, -1, 0);
                Form2.SetWindowPos(this.hHwnd, 1, 0, 0, intWidth, intHeight, 6);
                this.BtnCapTure.Enabled = false;
                this.BtnStop.Enabled = true;
            }
            else
            {
                Form2.DestroyWindow(this.hHwnd);
                this.BtnCapTure.Enabled = false;
                this.BtnStop.Enabled = true;
            }
        }

        private void BtnCapTure_Click(object sender, EventArgs e)
        {
            this.OpenCapture();
        }

        private void BtnStop_Click(object sender, EventArgs e)
        {
            Form2.SendMessage(this.hHwnd, 0x40b, 0, 0);
            Form2.DestroyWindow(this.hHwnd);
            this.BtnCapTure.Enabled=true;
            this.BtnStop.Enabled=false;
        }

      private   void   button1_Click(object   sender,   System.EventArgs   e)
      {
          try
          {
              Form2.SendMessage(this.hHwnd, 0x41e, 0, 0);
              IDataObject obj1 = Clipboard.GetDataObject();
              if (obj1.GetDataPresent(typeof(Bitmap)))
              {
                  Image image1 = (Image)obj1.GetData(typeof(Bitmap));
                  //   this.panel_Vedio.Image   =   image1;
                  //   this.ClosePreviewWindow();

                  SaveFileDialog SaveFileDialog1 = new SaveFileDialog();
                  SaveFileDialog1.FileName = DateTime.Now.ToString("yyyyMMddhhmmss");
                  SaveFileDialog1.Filter = "Image Files(*.JPG;*.GIF)|*.JPG;*.GIF|All files (*.*)|*.*";
                  if (SaveFileDialog1.ShowDialog() == DialogResult.OK)
                  {
                      image1.Save(SaveFileDialog1.FileName, ImageFormat.Bmp);
                  }
              }
          }
          catch
          {
          }
      }

}

在vs2005环境下调试通过，代码参考了csdn中部分帖子和博客
}

源代码下载地址：http://download.youkuaiyun.com/detail/malongning/5056816