c#攝像頭編程

攝像頭編程

安裝攝像頭後，一般可以找到一個avicap32.dll文件

這是一個關於設想頭的類

using　system;
using　System.Runtime.InteropServices;
namespace　webcam
{
///
///　avicap　的摘要說明。
///
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);
}
}
}

具體調用如下：　

using　system;
using　System.Drawing;
using　System.Collections;
using　System.ComponentModel;
using　System.Windows.Forms;
using　System.Data;
using　webcam;
namespace　webcam
{
///
///　Form1　的摘要說明。
///
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;
///
///　必需的設計器變量。
///
private　System.ComponentModel.Container　components　=　null;
WebCamera　wc;
public　form1()
{
//
//　Windows　窗體設計器支持所必需的
//
InitializeComponent();
//
//　TODO:　在　InitializeComponent　調用後添加任何構造函數代碼
//
}
///
///　清理所有正在使用的資源。
///
protected　override　void　Dispose(　bool　disposing　)
{
if(　disposing　)
{
if　(components　!=　null)
{
components.Dispose();
}
}
base.Dispose(　disposing　);
}
#region　windows　窗體設計器生成的代碼
///
///　設計器支持所需的方法　-　不要使用代碼編輯器修改
///　此方法的內容。
///
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　=　"&;amp;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　=　"&;amp;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
///
///　應用程序的主入口點。
///
[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();
}
}
}
from:

http://blog.csdn.net/libiegoupan/archive/2004/09/02/92547.aspx