关于C#调用摄像头的问题

2014-11-15 10:55:47 352 阅读 AI 写同款 · GEO 优化AI 选题数据监测一键分发 ›

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C#调用两个至多个USB摄像头的问题 using System; using System.Collections.Generic; using System.Text; using System.Runtime.InteropServices;using System.Drawing;namespace USBcamera{ public class VideoWork { < 阅读详情

本人上网找了一个操作摄像头的代码，根据个人需要稍作修改，是调用avicap32.dll插件的，但出现问题。程序不稳定，一时能正常调用、抓拍，一时就不能，只有黑屏。到底怎么回事？

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关于c#调用usb摄像头的回调码流解码问题最近，想用c#调用电脑摄像头，参考了“赤色火焰”的博客http://www.cnblogs.com/mgod/archive/2008/06/18/1224351.html，但对码流解码方面的介绍没有，上网搜也没有找到。于是，开始分析FrameCallBack中的VideoData的码流结构发现其分辨率是640*480，排列方式是YCbYCr，一行的排列是Y0CbY1CrY2CbY3CrY4CbY 阅读详情

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sinat_22916545 2014-11-15

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这是我出现不稳定的代码，怎么也找不到原因，求帮助！！！！！

引用 2 楼 sinat_22916545 的回复:

摄像头控制类


using System;
using System.Collections.Generic;
using System.Linq;
using System.Runtime.InteropServices;
using System.Text;
using System.Threading.Tasks;

namespace WindowsFormsApplication1
{
    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;


        public static int WM_CAP_DLG_VIDEOSOURCE = (WM_CAP_START + 42);    //选择摄像头

        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, int 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.ToInt32());
        }



        /// <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.ToInt32());
            SendMessage(hWndC, WM_CAP_SEQUENCE, 0, 0);
        }



        /// <summary>
        /// 停止录像
        /// </summary>
        public void StopKinescope()
        {
            SendMessage(hWndC, WM_CAP_STOP, 0, 0);
        }

        /// <summary>
        /// 
        /// </summary>
        public void SetShow()
        {
            SendMessage(hWndC, WM_CAP_DLG_VIDEOSOURCE, 0, 0);
        }
    }
}

winform窗体调用


using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace WindowsFormsApplication1
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        Pick pick;

        private void button1_Click(object sender, EventArgs e)
        {
            pick = new Pick(this.pictureBox1.Handle, 0, 0, this.pictureBox1.Width, this.pictureBox1.Height);
            pick.Start();
        }

        private void button2_Click(object sender, EventArgs e)
        {

            pick.Stop();
            this.pictureBox1 = null;
        }

        private void button3_Click(object sender, EventArgs e)
        {
            pick.GrabImage(@"d:\aa.png");
        }

        private void Form1_FormClosing(object sender, FormClosingEventArgs e)
        {
            if (MessageBox.Show("退出本系统?", "提示", MessageBoxButtons.OKCancel, MessageBoxIcon.Question) == DialogResult.OK)
                Application.Exit();
        }
    }
}

界面截图：

sinat_22916545 2014-11-15

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引用 1 楼 sp1234 的回复:

不妨使用Silverlight的“本地窗口程序/浏览器外”模式开发一个应用程序。它不需要你安装什么摄像头驱动，就能开发很好的摄像头录象软件。而且可以支持本地磁盘读写、支持udp/tcp跨进程通讯，可以跟其它桌面程序集成起来。

具体是怎么做？我从来没有用过Silverlight，所以不会用，求指导。

sinat_22916545 2014-11-15

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摄像头控制类



using System;

using System.Collections.Generic;

using System.Linq;

using System.Runtime.InteropServices;

using System.Text;

using System.Threading.Tasks;



namespace WindowsFormsApplication1

{

    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;





        public static int WM_CAP_DLG_VIDEOSOURCE = (WM_CAP_START + 42);    //选择摄像头



        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, int 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.ToInt32());

        }







        /// <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.ToInt32());

            SendMessage(hWndC, WM_CAP_SEQUENCE, 0, 0);

        }







        /// <summary>

        /// 停止录像

        /// </summary>

        public void StopKinescope()

        {

            SendMessage(hWndC, WM_CAP_STOP, 0, 0);

        }



        /// <summary>

        /// 

        /// </summary>

        public void SetShow()

        {

            SendMessage(hWndC, WM_CAP_DLG_VIDEOSOURCE, 0, 0);

        }

    }

}

winform窗体调用



using System;

using System.Collections.Generic;

using System.ComponentModel;

using System.Data;

using System.Drawing;

using System.Linq;

using System.Text;

using System.Threading.Tasks;

using System.Windows.Forms;



namespace WindowsFormsApplication1

{

    public partial class Form1 : Form

    {

        public Form1()

        {

            InitializeComponent();

        }



        Pick pick;



        private void button1_Click(object sender, EventArgs e)

        {

            pick = new Pick(this.pictureBox1.Handle, 0, 0, this.pictureBox1.Width, this.pictureBox1.Height);

            pick.Start();

        }



        private void button2_Click(object sender, EventArgs e)

        {



            pick.Stop();

            this.pictureBox1 = null;

        }



        private void button3_Click(object sender, EventArgs e)

        {

            pick.GrabImage(@"d:\aa.png");

        }



        private void Form1_FormClosing(object sender, FormClosingEventArgs e)

        {

            if (MessageBox.Show("退出本系统?", "提示", MessageBoxButtons.OKCancel, MessageBoxIcon.Question) == DialogResult.OK)

                Application.Exit();

        }

    }

}

界面截图：

以专业开发人员为伍 2014-11-15

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不妨使用Silverlight的“本地窗口程序/浏览器外”模式开发一个应用程序。它不需要你安装什么摄像头驱动，就能开发很好的摄像头录象软件。而且可以支持本地磁盘读写、支持udp/tcp跨进程通讯，可以跟其它桌面程序集成起来。

关于C#调用摄像头的问题

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