C# 调用多个摄像头问题！

[ivanho]

目前情况是这样：

调用一个摄像头是没有问题的，但调用多个报像头就无法显示第二个以后的摄像头了，望高手们赐教。。。


目前的调用代码：

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using System.Runtime.InteropServices;
using System.Drawing.Imaging;
using System.Net;
using System.Net.Sockets;
using System.Threading;
namespace camera
{

   
    public partial class CameraForm : Form
    {
        private int hHwnd;
        private const int port = 2000;
        public CameraForm()
        {
            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>   
        
        [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.panel1.Width;
            int intHeight = this.panel1.Height;
            int intDevice = 0;
            string refDevice = intDevice.ToString();
            //创建视频窗口并得到句柄
            hHwnd = CameraForm.capCreateCaptureWindowA(ref   refDevice, 1342177280, 0, 0, 640, 480, this.panel1.Handle.ToInt32(), 0);
            if (CameraForm.SendMessage(hHwnd, 0x40a, intDevice, 0) > 0)
            {
                CameraForm.SendMessage(this.hHwnd, 0x435, -1, 0);
                CameraForm.SendMessage(this.hHwnd, 0x434, 0x42, 0);
                CameraForm.SendMessage(this.hHwnd, 0x432, -1, 0);
                CameraForm.SetWindowPos(this.hHwnd, 1, 0, 0, intWidth, intHeight, 6);
            }
            else
            {
                CameraForm.DestroyWindow(this.hHwnd);
            }
        }

        private void button1_Click(object sender, EventArgs e)
        {
            this.OpenCapture();
        }

        private void button2_Click(object sender, EventArgs e)
        {
            //停止视频注销视频句柄
            CameraForm.SendMessage(this.hHwnd, 0x40b, 0, 0);
            CameraForm.DestroyWindow(this.hHwnd);
        }

        //截图
        private void button3_Click(object sender, EventArgs e)
        {
            try
            {
                CameraForm.SendMessage(this.hHwnd, 0x41e, 0, 0);
                IDataObject obj1 = Clipboard.GetDataObject();
                if (obj1.GetDataPresent(typeof(Bitmap)))
                {
                    Image image1 = (Image)obj1.GetData(typeof(Bitmap));
                    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
            {
            }
        }

[ivanho]

解决问题了。。。

[gongsun]

这个的看 你这个摄像头的驱动支持不支持 多个摄像头了。

[ztenv]

同上，应该和驱动有关，

[ivanho]

这个。。。可能也很难说了，因为这个是免驱的。。。

另外，要是不同的摄像头，情况又该如何？

[songcan]

怎么解决的?

[mailbao]

留個問號學學....

[ivanho]

调用“Aforge”

   private FilterInfoCollection videoDevices;
        private VideoCaptureDevice videoSource = null;

        private void getCamList()
        {
            try
            {
                videoDevices = new FilterInfoCollection(FilterCategory.VideoInputDevice);
                comboBox1.Items.Clear();
                if (videoDevices.Count == 0)
                    throw new ApplicationException();

                DeviceExist = true;
                foreach (FilterInfo device in videoDevices)
                {
                    comboBox1.Items.Add(device.Name);
                }
                comboBox1.SelectedIndex = 0; //make dafault to first cam
            }
            catch (ApplicationException)
            {
                DeviceExist = false;
                comboBox1.Items.Add("系统中没有可用设备！");
            }
        }

      private void OpenSignal_Click(object sender, EventArgs e)//开启信号
        {
            pictureBox1.Image = null;
            if (OpenSignal.Text == "&开启拍摄信号")
            {
                if (DeviceExist)
                {
                    videoSource = new VideoCaptureDevice(videoDevices[comboBox1.SelectedIndex].MonikerString);
                    videoSource.NewFrame += new NewFrameEventHandler(video_NewFrame);
                    CloseVideoSource();
                    videoSource.DesiredFrameSize = new Size(2048, 1536);
                    //videoSource.DesiredFrameRate = 10;
                    videoSource.Start();

                    OpenSignal.Text = "&关闭拍摄信号";

                }
                else
                {
                    label1.Text = "程序报错: 没有可用的拍摄设备！";
                }
            }
            else
            {
                if (videoSource.IsRunning)
                {

                    CloseVideoSource();
                    //label1.Text = "Device stopped.";
                    OpenSignal.Text = "&开启拍摄信号";
                }
            }
        }

        private void video_NewFrame(object sender, NewFrameEventArgs eventArgs)
        {
            Bitmap img = (Bitmap)eventArgs.Frame.Clone();
            //do processing here
            pictureBox1.Image = img;
        }

        private void CloseVideoSource() //close the device safely
        {
            if (!(videoSource == null))
                if (videoSource.IsRunning)
                {
                    videoSource.SignalToStop();
                    videoSource = null;
                }
        } 

 private void JCZX_Loam300_FormClosed(object sender, FormClosedEventArgs e)
        {
            CloseVideoSource();
        }

[js_dada]

可以发源代码来看看吗？感谢~~~~~[e-mail]

[dabao1026]

学习了 顶

[Hello_Wrorld_2010]

帮顶。。。

[woaiyu6464]

make一下 楼主，最近我在弄摄像头这块。。 用的avicap32.dll
如果机器上只有一个摄像头就可以照相。 如果有两个（如笔记本本身就有一个，我又用usb连接了一个），就出错了。 想知道怎么能驱动指定摄像头照相。

哈~~~ 麻烦楼主了

[c65061362]

求楼主源代码啊。。[e-mail]

[morutx]

楼主求源码 [e-mail]

[wisher2012]

楼主求源代码 [e-mail] QQ:156751202