如何捕获usb摄像头的数据？？？

Question

现在都是有现成的摄像头软件来显示或者保存视频资料，一款通用的软件就是vp-eye既然这样，就说明每种摄像头的数据流格式都是一样的。现在我想自己启动摄像头，取得摄像头的数据。而且还是2个摄像头请问有人知道么？或者给我点资料看看

Answer 1

net这方面的开发功能好象没有吧,如果用C++或调用COM对象好象还可以吧

Answer 2

C#捕捉视频头（源码） using System;
using System.Runtime.InteropServices;namespace Wuyin.ShoesManager
{
    /// <summary>
    /// VedioCapture 的摘要说明。
    /// </summary>
    public class VedioCapture
    {
        private int hCaptureM;
        private bool isUnLoad = false;
        public VedioCapture()
        {        
        }
        [DllImport("avicap32.dll")]
        private static extern int capCreateCaptureWindow( string strWindowName, int dwStyle, int x, int y ,int width, int height , int hwdParent, int nID );
        [DllImport("user32.dll")]
        private static extern int SendMessage( int hwnd , int wMsg, int wParam , int lParam );
        [DllImport("user32.dll")]
        private static extern int SendMessage( int hwnd , int wMsg, int wParam , string lParam );
        [DllImport("Kernel32.dll")]
        private static extern bool CloseHandle( int hObject );
        public bool Initialize( System.Windows.Forms.Control aContainer , int intWidth, int intHeight )
        {
            hCaptureM = capCreateCaptureWindow( "", 0x40000000 | 0x10000000, 0,0,intWidth,intHeight,aContainer.Handle.ToInt32() ,1 );
            if( hCaptureM == 0 ) return false;
            
            int ret = SendMessage( hCaptureM , 1034, 0,0 );
            if( ret == 0 )
            {
                CloseHandle(hCaptureM);
                return false;
            }
            //WM_CAP_SET_PREVIEW
            ret = SendMessage( hCaptureM, 1074, 1, 0 );
            if( ret == 0 )
            {
                this.UnLoad();
                return false;
            }
            //WM_CAP_SET_SCALE
            ret = SendMessage( hCaptureM, 1077, 1, 0 );
            if( ret == 0 )
            {
                this.UnLoad();
                return false;
            }
            //WM_CAP_SET_PREVIEWRATE
            ret = SendMessage( hCaptureM, 1076, 66, 0 );
            if( ret == 0 )
            {
                this.UnLoad();
                return false;
            }
            return true;
        }        public void SingleFrameBegin()
        {
            //
            int ret = SendMessage( hCaptureM, 1094 , 0, 0 );
        }
        public void SingleFrameEnd()
        {
            //
            int ret = SendMessage( hCaptureM, 1095 , 0, 0 );
        }        public void SingleFrameMode()
        {
            //WM_CAP_GRAB_FRAME
            int ret = SendMessage(  hCaptureM, 1084 , 0, 0 );
            //WM_CAP_SET_PREVIEW 
            //int ret = SendMessage(  hCaptureM, 1074 , 0, 0 );
            //WM_CAP_SINGLE_FRAME
            //ret = SendMessage( hCaptureM, 1096 , 0, 0 );
        }
        public void PreviewMode()
        {
            int ret = SendMessage( hCaptureM, 1074 , 1, 0 );
        }                public void UnLoad()
        {
            int ret = SendMessage( hCaptureM, 1035, 0, 0 );
            CloseHandle( this.hCaptureM );
            isUnLoad = true;
        }        public void CopyToClipBorad()
        {
            int ret = SendMessage(  hCaptureM, 1054, 0, 0 );
        }        public void ShowFormatDialog()
        {
            int ret = SendMessage(  hCaptureM, 1065, 0, 0 );
        }
        public void SaveToDIB( string fileName )
        {
            int ret = SendMessage(  hCaptureM, 1049, 0, fileName );
        }        public void ShowDisplayDialog()
        {
            int ret = SendMessage( hCaptureM, 1067, 0, 0 );
        }
        public System.Drawing.Image getCaptureImage()
        {
            System.Windows.Forms.IDataObject iData = System.Windows.Forms.Clipboard.GetDataObject();
            System.Drawing.Image retImage = null;
            if( iData !=  null ) 
            {
                if( iData.GetDataPresent( System.Windows.Forms.DataFormats.Bitmap ) )
                {
                    retImage = (System.Drawing.Image)iData.GetData( System.Windows.Forms.DataFormats.Bitmap );
                } 
                else if( iData.GetDataPresent( System.Windows.Forms.DataFormats.Dib  ) )
                {
                    retImage = (System.Drawing.Image)iData.GetData( System.Windows.Forms.DataFormats.Dib );
                }
            }
            return retImage;
        }        ~VedioCapture()
        {
            if( !isUnLoad )
            {
                this.UnLoad();
            }
        }
    }
}

Answer 3

ruixing123(想入非非) 你能不能提供avicap32.dll这个dll函数的详细说明阿？？？

Answer 4

directshow 是一个现在的封穿以前有位朋友发过一个视频聊天程序的源代码,里面有视频这一块它是直接使用最原初的API操作的.媒体编程偶不是太熟

Answer 5

vfm SDK和directshow 都可以

Answer 6

正好这段时间参加一个微软的比赛用到这个了。就将部分实现代码给你看下：
前面的类如同前面的那个一样给出，这是可以通用的。
使用时的代码如下：
//抓图并保存为JPEG图像文件
vi.CopyToClipBorad();
Image img = vi.getCaptureImage();
Graphics g = pictureBox2.CreateGraphics();Rectangle rec = new Rectangle(0,0,320,240);
g.DrawImage(img,rec,0,0,320,240,GraphicsUnit.Pixel);System.Drawing.Image bmp =null;
bmp = System.Drawing.Bitmap.FromFile("ditu.bmp");
System.Drawing.Graphics g1 = Graphics.FromImage(bmp);
g1.DrawImage(img,rec,0,0,320,240,GraphicsUnit.Pixel);
String fromTitle = titleBox.Text;
String imgName;
if(fromTitle.Equals(""))
{
imgName = DateTime.Now.ToLongDateString()+"_"+DateTime.Now.Hour+"_"+DateTime.Now.Minute+"_"+DateTime.Now.Second+".jpg";
}
else
{
imgName = fromTitle+".jpg";}
System.Drawing.Rectangle(100,100,250,250));MessageBox.Show("the pic named "+imgName +"  has been saved!");
bmp.Save(imgName,System.Drawing.Imaging.ImageFormat.Jpeg);img.Dispose();
g1.Dispose();
g.Dispose();
bmp.Dispose();

Answer 7

晕，我是一台机器上2个摄像头，如何才能用那个dll启动2个摄像头呢？？？
大家有没有那个dll里面的函数说明阿？

Answer 8

看api
里面有个Capture的具体如
ruixing123(想入非非)那样做就差不多的了