在网上找了一些关于控制摄像头编程的资料，不知道为什么在我这里总是有些问题，不过最终还是克服了，可惜的是我没有把排错的过程记录下来，现在把代码贴出来，发个帖子吧！
运行环境：VS2005 C#
具体实现代码：
using System;using System.Collections.Generic;using System.ComponentModel;using System.Data;using System.Drawing;using System.Text;using System.Windows.Forms;
using System.Collections;using webcam;
namespace WebCanon{ public partial class Form1 : Form { public Form1() { InitializeComponent(); }
private void Form1_Load(object sender, 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_play_Click(object sender, 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, EventArgs e) { b_play.Enabled = true; b_stop.Enabled = false; wc.CloseWebcam(); }
private void button1_Click(object sender, EventArgs e) { wc.Kinescope(Application.StartupPath.ToString()+"//111.avi"); this.button1.Enabled = false; this.button2.Enabled = true ; }
private void button2_Click(object sender, EventArgs e) { wc.StopKinescope(); this.button1.Enabled = true; this.button2.Enabled = false; }
/// <summary> /// 抓图 /// </summary> /// <param name="sender"></param> /// <param name="e"></param> private void button3_Click(object sender, EventArgs e) { wc.GrabImage(Application.StartupPath+"//my.bmp"); } }}
调用的类文件：
using System;using System.Runtime.InteropServices;
namespace webcam{ /// /// avicap 的摘要说明。 /// public class showVideo { [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;
public const int WM_CAP_SAVEDIB = WM_USER + 25; public const int WM_CAP_FILE_SET_CAPTURE_FILEA = WM_USER + 20; public const int WM_CAP_SEQUENCE = WM_USER + 62; public const int WM_CAP_STOP = WM_USER + 68;
// 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); }
/// <summary> /// 抓图 /// </summary> /// <param name="path">要保存bmp文件的路径</param> public void GrabImage(IntPtr hCapWnd,string path) {
IntPtr hBmp = Marshal.StringToHGlobalAnsi(path); showVideo.SendMessage(hCapWnd, showVideo.WM_CAP_SAVEDIB, 0, hBmp.ToInt32());
} public void GrabImage(string path) {
IntPtr hBmp = Marshal.StringToHGlobalAnsi(path); showVideo.SendMessage(lwndC, showVideo.WM_CAP_SAVEDIB, 0, hBmp.ToInt32());
} /// <summary> /// 录像 /// </summary> /// <param name="path">要保存avi文件的路径</param> public void Kinescope(IntPtr hCapWnd,string path) { IntPtr hBmp = Marshal.StringToHGlobalAnsi(path); showVideo.SendMessage(hCapWnd, showVideo.WM_CAP_FILE_SET_CAPTURE_FILEA, 0, hBmp.ToInt32()); showVideo.SendMessage(hCapWnd, showVideo.WM_CAP_SEQUENCE, 0, 0); } public void Kinescope(string path) { IntPtr hBmp = Marshal.StringToHGlobalAnsi(path); showVideo.SendMessage(lwndC, showVideo.WM_CAP_FILE_SET_CAPTURE_FILEA, 0, hBmp.ToInt32()); showVideo.SendMessage(lwndC, showVideo.WM_CAP_SEQUENCE, 0, 0); } /// <summary> /// 停止录像 /// </summary> public void StopKinescope(IntPtr hCapWnd) { showVideo.SendMessage(hCapWnd, showVideo.WM_CAP_STOP, 0, 0); } public void StopKinescope() { showVideo.SendMessage(lwndC, showVideo.WM_CAP_STOP, 0, 0); } 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); } }
}
