C# 如何操作摄像头

a349175127 2011-07-25 11:39:29

如题 C#如何操作摄像头呢而且如何判断电脑里有没有摄像头我在网上看了也用了好多源码发现基本上启动摄像头的时候都不稳定要么不显示，要么显示出来全是蓝颜色求解

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心灵彩虹 2011-07-25

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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  );

}



#region  windows  窗体设计器生成的代码

///  

///  设计器支持所需的方法  -  不要使用代码编辑器修改

///  此方法的内容。

///  

private  void  InitializeComponent()

{

this.b_play  =  new  System.Windows.Forms.Button();

this.panelPreview  =  new  System.Windows.Forms.Panel();

this.b_stop  =  new  System.Windows.Forms.Button();

this.SuspendLayout();

//  

//  b_play

//  

this.b_play.Location  =  new  System.Drawing.Point(280,  368);

this.b_play.Name  =  "b_play";

this.b_play.TabIndex  =  0;

this.b_play.Text  =  "&Play";

this.b_play.Click  +=  new  System.EventHandler(this.button1_Click);

//  

//  panelPreview

//  

this.panelPreview.Location  =  new  System.Drawing.Point(8,  8);

this.panelPreview.Name  =  "panelPreview";

this.panelPreview.Size  =  new  System.Drawing.Size(344,  272);

this.panelPreview.TabIndex  =  1;

//  

//  b_stop

//  

this.b_stop.Enabled  =  false;

this.b_stop.Location  =  new  System.Drawing.Point(360,  368);

this.b_stop.Name  =  "b_stop";

this.b_stop.TabIndex  =  2;

this.b_stop.Text  =  "&Stop";

this.b_stop.Click  +=  new  System.EventHandler(this.b_stop_Click);

//  

//  Form1

//  

this.AutoScaleBaseSize  =  new  System.Drawing.Size(6,  14);

this.ClientSize  =  new  System.Drawing.Size(464,  413);

this.Controls.Add(this.b_stop);

this.Controls.Add(this.panelPreview);

this.Controls.Add(this.b_play);

this.MaximizeBox  =  false;

this.MinimizeBox  =  false;

this.Name  =  "Form1";

this.Text  =  "GoodView  test  Web  Camera";

this.Load  +=  new  System.EventHandler(this.Form1_Load);

this.ResumeLayout(false);



}

#endregion



///  

///  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();

}

}

}

心灵彩虹 2011-07-25

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摄像头编程 

安装摄像头后，一般可以找到一个avicap32.dll文件 



这是一个关于设想头的类



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);

}

}



}

wangxiao2008 2011-07-25

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学习学习

liuxiongliuxiong 2011-07-25

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果断API

ruanwei1987 2011-07-25

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API

Kobayashi 2011-07-25

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一楼的可行。。。

q107770540 2011-07-25

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http://topic.csdn.net/u/20091202/12/e485aa77-df7e-4026-b46e-e4b63feca911.html

isjoe 2011-07-25

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[Quote=引用楼主 a349175127 的回复:]
如题 C#如何操作摄像头呢而且如何判断电脑里有没有摄像头我在网上看了也用了好多源码发现基本上启动摄像头的时候都不稳定要么不显示，要么显示出来全是蓝颜色求解
[/Quote]

http://www.codeproject.com/KB/directx/directxcapture.aspx
这个很不错的例子，有源码，比较全面的例子

happyday1799 2011-07-25

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有点长，可以当做参考：



using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.Runtime.InteropServices;



namespace Video

{

    class cVideo

    {

        //导入API函数

        [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);

        //常量设置

        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;

        private const int WM_CAP_FILE_SAVEAS = WM_CAP_START + 23; //将捕捉文件保存为另一个用户指定的文件。这个消息不会改变捕捉文件的名字和内容,



        //全局变量

        private IntPtr hWndC;　//句柄

        private IntPtr mControlPtr;　//句柄

        private bool bWorkStart = false;

        private int mWidth;　　//视频显示宽度

        private int mHeight; //视频显示高度

        private int mLeft; //视频显示左边距

        private int mTop; //视频显示上边距

        /// <summary>   

        /// 初始化显示图像   

        /// </summary>   

        /// <param name="handle">播放视频控件的句柄</param>   

        /// <param name="left">视频显示的左边距</param>   

        /// <param name="top">视频显示的上边距</param>

        /// <param name="down">视频显示的下边距</param>

        /// <param name="right">视频显示的右边距</param>

        /// <param name="width">要显示视频的宽度</param>   

        /// <param name="height">要显示视频的长度</param>   

        public cVideo(IntPtr handle, int left, int top, int width, int height)

        {

            mControlPtr = handle;

            mWidth = width;

            mHeight = height;

            mLeft = left;

            mTop = top;

        }

        /// <summary>   

        /// 打开视频  

        /// </summary>   

        public void StartVideo()

        {

            if (bWorkStart)

                return;

            bWorkStart = true;

            byte[] lpszName = new byte[100];

            //创建播放窗口

            hWndC = capCreateCaptureWindowA(lpszName, WS_CHILD | WS_VISIBLE, mLeft, mTop, mWidth, mHeight, mControlPtr, 0);



            if (hWndC.ToInt32() != 0)

            {

                //显示视频

                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, 100, 0);

                SendMessage(hWndC, WM_CAP_SET_OVERLAY, 1, 0);

                SendMessage(hWndC, WM_CAP_SET_PREVIEW, 1, 0);

            }

        }

        /// <summary>   

        /// 关闭视频   

        /// </summary>   

        public void StopVideo()

        {

            SendMessage(hWndC, WM_CAP_DRIVER_DISCONNECT, 0, 0);

            bWorkStart = false;

        }



        /// <summary>

        /// 拍照

        /// </summary>

        /// <param name="path">文件路径</param>

        public void Images(string path)

        {

            IntPtr imagePath = Marshal.StringToHGlobalAnsi(path);

            SendMessage(hWndC, WM_CAP_SAVEDIB, 0, imagePath.ToInt32());

        }



    }

}

a349175127 2011-07-25

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[Quote=引用 8 楼 gefangliang 的回复:]
C# code

摄像头编程
安装摄像头后，一般可以找到一个avicap32.dll文件

这是一个关于设想头的类

using system;
using System.Runtime.InteropServices;

namespace webcam
{
///
/// avicap 的摘要说明。
///
public class ……
[/Quote]

这里哪句是判断摄像头是否打开的呢

lj1985521 2011-07-25