C#摄像头源码

C#摄像头源码是一个摄像头设备调用的一个程序，也可以收拾一个驱动程序，有了它电脑上的摄像头可以正常的工作。C#写的超简单的摄像头视频获取源代码，还可以完成视频截图，现在很多摄像头都是无驱动的，这种方法我试验没有成功，不知道各位高人有没有这方面的经验，网上也一直再问如何做视频录像

(1)安装摄像头后，一般可以找到一个avicap32.dll文件,里面有一些操作摄像头的方法。

(2)这是一个关于摄像头的类:

c#摄像头源码

         using System;

using System.Runtime.InteropServices;

namespace webcam

{

 /// 

 /// avicap 的摘要说明。

 /// 

 public class showVideo

 {

  // showVideo calls

  [DllImport("avicap32.dll")] 

  public static extern IntPtr capCreateCaptureWindowA(byte[] lpszWindowName, int dwStyle, int x, int y, int nWidth, int nHeight, IntPtr hWndParent, int nID);

  [DllImport("avicap32.dll")] 

  public static extern bool capGetDriverDescriptionA(short wDriver, byte[] lpszName, int cbName, byte[] lpszVer, int cbVer);

  [DllImport("User32.dll")] 

  public static extern bool SendMessage(IntPtr hWnd, int wMsg, bool wParam, int lParam); 

  [DllImport("User32.dll")] 

  public static extern bool SendMessage(IntPtr hWnd, int wMsg, short wParam, int lParam); 

  [DllImport("User32.dll")] 

  public static extern bool SendMessage(IntPtr hWnd, int wMsg, short wParam, FrameEventHandler lParam); 

  [DllImport("User32.dll")] 

  public static extern bool SendMessage(IntPtr hWnd, int wMsg, int wParam, ref BITMAPINFO lParam);

  [DllImport("User32.dll")] 

  public static extern int SetWindowPos(IntPtr hWnd, int hWndInsertAfter, int x, int y, int cx, int cy, int wFlags);

  [DllImport("avicap32.dll")]

  public static extern int capGetVideoFormat(IntPtr hWnd, IntPtr psVideoFormat, int wSize );

  // Constants

  public const int WM_USER = 0x400;

  public const int WS_CHILD = 0x40000000;

  public const int WS_VISIBLE = 0x10000000;

  public const int SWP_NOMOVE = 0x2;

  public const int SWP_NOZORDER = 0x4;

  public const int WM_CAP_DRIVER_CONNECT = WM_USER + 10;

  public const int WM_CAP_DRIVER_DISCONNECT = WM_USER + 11;

  public const int WM_CAP_SET_CALLBACK_FRAME = WM_USER + 5;

  public const int WM_CAP_SET_PREVIEW = WM_USER + 50;

  public const int WM_CAP_SET_PREVIEWRATE = WM_USER + 52;

  public const int WM_CAP_SET_VIDEOFORMAT = WM_USER + 45;

  // Structures

  [StructLayout(LayoutKind.Sequential)] public struct VIDEOHDR

  {

   [MarshalAs(UnmanagedType.I4)] public int lpData;

   [MarshalAs(UnmanagedType.I4)] public int dwBufferLength;

   [MarshalAs(UnmanagedType.I4)] public int dwBytesUsed;

   [MarshalAs(UnmanagedType.I4)] public int dwTimeCaptured;

   [MarshalAs(UnmanagedType.I4)] public int dwUser;

   [MarshalAs(UnmanagedType.I4)] public int dwFlags;

   [MarshalAs(UnmanagedType.ByValArray, SizeConst=4)] public int[] dwReserved;

  }

  [StructLayout(LayoutKind.Sequential)] public struct BITMAPINFOHEADER

  {

   [MarshalAs(UnmanagedType.I4)] public Int32 biSize ;

   [MarshalAs(UnmanagedType.I4)] public Int32 biWidth ;

   [MarshalAs(UnmanagedType.I4)] public Int32 biHeight ;

   [MarshalAs(UnmanagedType.I2)] public short biPlanes;

   [MarshalAs(UnmanagedType.I2)] public short biBitCount ;

   [MarshalAs(UnmanagedType.I4)] public Int32 biCompression;

   [MarshalAs(UnmanagedType.I4)] public Int32 biSizeImage;

   [MarshalAs(UnmanagedType.I4)] public Int32 biXPelsPerMeter;

   [MarshalAs(UnmanagedType.I4)] public Int32 biYPelsPerMeter;

   [MarshalAs(UnmanagedType.I4)] public Int32 biClrUsed;

   [MarshalAs(UnmanagedType.I4)] public Int32 biClrImportant;

  } 

  [StructLayout(LayoutKind.Sequential)] public struct BITMAPINFO

  {

   [MarshalAs(UnmanagedType.Struct, SizeConst=40)] public BITMAPINFOHEADER bmiHeader;

   [MarshalAs(UnmanagedType.ByValArray, SizeConst=1024)] public Int32[] bmiColors;

  }

  public delegate void FrameEventHandler(IntPtr lwnd, IntPtr lpVHdr);

  // Public methods

  public static object GetStructure(IntPtr ptr,ValueType structure)

  {

   return Marshal.PtrToStructure(ptr,structure.GetType());

  }

  public static object GetStructure(int ptr,ValueType structure)

  {

   return GetStructure(new IntPtr(ptr),structure);

  }

  public static void Copy(IntPtr ptr,byte[] data)

  {

   Marshal.Copy(ptr,data,0,data.Length);

  }

  public static void Copy(int ptr,byte[] data)

  {

   Copy(new IntPtr(ptr),data);

  }

  public static int SizeOf(object structure)

  {

   return Marshal.SizeOf(structure); 

  }

 }

  //Web Camera Class

 public class WebCamera

 {

  // Constructur

  public WebCamera(IntPtr handle, int width,int height)

  {

   mControlPtr = handle;

   mWidth = width;

   mHeight = height;

  }

  // delegate for frame callback

  public delegate void RecievedFrameEventHandler(byte[] data);

  public event RecievedFrameEventHandler RecievedFrame;

  private IntPtr lwndC; // Holds the unmanaged handle of the control

  private IntPtr mControlPtr; // Holds the managed pointer of the control

  private int mWidth;

  private int mHeight;

  private showVideo.FrameEventHandler mFrameEventHandler; // Delegate instance for the frame callback - must keep alive! gc should NOT collect it

  // Close the web camera

  public void CloseWebcam()

  {

   this.capDriverDisconnect(this.lwndC);

  }

  // start the web camera

  public void StartWebCam()

  {

   byte[] lpszName = new byte[100];

   byte[] lpszVer = new byte[100];

   showVideo.capGetDriverDescriptionA(0, lpszName, 100,lpszVer, 100);

   this.lwndC = showVideo.capCreateCaptureWindowA(lpszName, showVideo.WS_VISIBLE + showVideo.WS_CHILD, 0, 0, mWidth, mHeight, mControlPtr, 0);

   if (this.capDriverConnect(this.lwndC, 0))

   {

    this.capPreviewRate(this.lwndC, 66);

    this.capPreview(this.lwndC, true);

    showVideo.BITMAPINFO bitmapinfo = new showVideo.BITMAPINFO(); 

    bitmapinfo.bmiHeader.biSize = showVideo.SizeOf(bitmapinfo.bmiHeader);

    bitmapinfo.bmiHeader.biWidth = 352;

    bitmapinfo.bmiHeader.biHeight = 288;

    bitmapinfo.bmiHeader.biPlanes = 1;

    bitmapinfo.bmiHeader.biBitCount = 24;

    this.capSetVideoFormat(this.lwndC, ref bitmapinfo, showVideo.SizeOf(bitmapinfo));

    this.mFrameEventHandler = new showVideo.FrameEventHandler(FrameCallBack);

    this.capSetCallbackOnFrame(this.lwndC, this.mFrameEventHandler);

    showVideo.SetWindowPos(this.lwndC, 0, 0, 0, mWidth , mHeight , 6);

   } 

  }

  // private functions

  private bool capDriverConnect(IntPtr lwnd, short i)

  {

   return showVideo.SendMessage(lwnd, showVideo.WM_CAP_DRIVER_CONNECT, i, 0);

  }

  private bool capDriverDisconnect(IntPtr lwnd)

  {

   return showVideo.SendMessage(lwnd, showVideo.WM_CAP_DRIVER_DISCONNECT, 0, 0);

  }

  private bool capPreview(IntPtr lwnd, bool f)

  {

   return showVideo.SendMessage(lwnd, showVideo.WM_CAP_SET_PREVIEW , f, 0);

  }

  private bool capPreviewRate(IntPtr lwnd, short wMS)

  {

   return showVideo.SendMessage(lwnd, showVideo.WM_CAP_SET_PREVIEWRATE, wMS, 0);

  }

  private bool capSetCallbackOnFrame(IntPtr lwnd, showVideo.FrameEventHandler lpProc)

  {     

   return showVideo.SendMessage(lwnd, showVideo.WM_CAP_SET_CALLBACK_FRAME, 0, lpProc);

  }

  private bool capSetVideoFormat(IntPtr hCapWnd, ref showVideo.BITMAPINFO BmpFormat, int CapFormatSize)

  {

   return showVideo.SendMessage(hCapWnd, showVideo.WM_CAP_SET_VIDEOFORMAT, CapFormatSize, ref BmpFormat);

  }

  private void FrameCallBack(IntPtr lwnd, IntPtr lpVHdr)

  {

   showVideo.VIDEOHDR videoHeader = new showVideo.VIDEOHDR();

   byte[] VideoData;

   videoHeader = (showVideo.VIDEOHDR)showVideo.GetStructure(lpVHdr,videoHeader);

   VideoData = new byte[videoHeader.dwBytesUsed];

   showVideo.Copy(videoHeader.lpData ,VideoData);

   if (this.RecievedFrame != null)

    this.RecievedFrame (VideoData);

  }

 }

}

具体调用如下：

using System;

using System.Drawing;

using System.Collections;

using System.ComponentModel;

using System.Windows.Forms;

using System.Data;

using webcam;

namespace webcam

{

 /// 

 /// Form1 的摘要说明。

 /// 

 public class Form1 : System.Windows.Forms.Form

 {

  private System.Windows.Forms.Panel panelPreview;

  private System.Windows.Forms.Button b_play;

  private System.Windows.Forms.Button b_stop;

  /// 

  /// 必需的设计器变量。

  /// 

  private System.ComponentModel.Container components = null;

  WebCamera wc;

  public Form1()

  {

   //

   // Windows 窗体设计器支持所必需的

   //

   InitializeComponent();

   //

   // TODO: 在 InitializeComponent 调用后添加任何构造函数代码

   //

  }

  /// 

  /// 清理所有正在使用的资源。

  /// 

  protected override void Dispose( bool disposing )

  {

   if( disposing )

   {

    if (components != null) 

    {

     components.Dispose();

    }

   }

   base.Dispose( disposing );

  }

  Windows 窗体设计器生成的代码

  /// 

  /// 应用程序的主入口点。

  /// 

  [STAThread]

  static void Main() 

  {

   Application.Run(new Form1());

  }

  private void Form1_Load(object sender, System.EventArgs e)

  {

   b_play.Enabled = false;

   b_stop.Enabled = true;

   panelPreview.Size = new Size(330,330);

   wc = new WebCamera( panelPreview.Handle,panelPreview.Width,panelPreview.Height);

   wc.StartWebCam();

  }

  private void button1_Click(object sender, System.EventArgs e)

  {

   b_play.Enabled = false;

   b_stop.Enabled = true;

   panelPreview.Size = new Size(330,330);

   wc = new WebCamera( panelPreview.Handle,panelPreview.Width,panelPreview.Height);

   wc.StartWebCam();

  }

  private void b_stop_Click(object sender, System.EventArgs e)

  {

   b_play.Enabled = true;

   b_stop.Enabled = false;

   wc.CloseWebcam();

  }

 }

}