界面：
源码：
using System; using System.Collections.Generic; using System.ComponentModel; using System.Data; using System.Drawing; using System.Linq; using System.Text; using System.Windows.Forms; //添加引用 using System.Runtime.InteropServices; using System.Drawing.Imaging; namespace Camera { public partial class FormMain : Form { WebCamera wc; //声明一个API函数 [System.Runtime.InteropServices.DllImportAttribute("gdi32.dll")] private static extern bool BitBlt( IntPtr hdcDest, // 目标 DC的句柄 int nXDest, int nYDest, int nWidth, int nHeight, IntPtr hdcSrc, // 源DC的句柄 int nXSrc, int nYSrc, System.Int32 dwRop // 光栅的处理数值 ); public FormMain() { InitializeComponent(); } private void btnPlay_Click(object sender, EventArgs e) { btnPlay.Enabled = false; btnStop.Enabled = true; //panelPreview.Size = new Size(330, 330); wc = new WebCamera(panelPreview.Handle, panelPreview.Width, panelPreview.Height); wc.StartWebCam(); } private void FormMain_Load(object sender, EventArgs e) { btnPlay.Enabled = false; btnStop.Enabled = true; //panelPreview.Size = new Size(330, 330); wc = new WebCamera(panelPreview.Handle, panelPreview.Width, panelPreview.Height); wc.StartWebCam(); } private void btnStop_Click(object sender, EventArgs e) { btnPlay.Enabled = true; btnStop.Enabled = false; wc.CloseWebcam(); } private void btnPhoto_Click(object sender, EventArgs e) { //创建一个以当前控件区域屏幕为模板的图象 Graphics gPanel = this.panelPreview.CreateGraphics(); Bitmap bmSave = new Bitmap(this.panelPreview.Width, this.panelPreview.Height); //用于保存图片的位图对象 Graphics gSave = Graphics.FromImage(bmSave); //得到屏幕的DC IntPtr dcPanel = gPanel.GetHdc(); //得到Bitmap的DC IntPtr dcSave = gSave.GetHdc(); //调用此API函数，实现屏幕捕获 BitBlt(dcSave, 0, 0, this.panelPreview.Width, this.panelPreview.Height, dcPanel, 0, 0, 13369376); //释放掉屏幕的DC gPanel.ReleaseHdc(dcPanel); //释放掉Bitmap的DC gSave.ReleaseHdc(dcSave); //以JPG文件格式来保存 bmSave.Save(@"D:/Photo.jpg", ImageFormat.Jpeg); MessageBox.Show("当前图像已经保存为D盘Photo文件！"); } } //show Video class 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); } } }
