利用avicap32.dll实现的实时视频传输

直接上代码吧！

在窗体上调用的类：

using System; using System.Collections.Generic; using System.ComponentModel; using System.Data; using System.Drawing; using System.Text; using System.Windows.Forms; using System.Net; using System.Net.Sockets; using System.Threading; namespace 实时视频传输系统 { public partial class MainForm : Form { public MainForm() { InitializeComponent(); } /// <summary> /// 声明Camera类 /// </summary> Camera ca = null; //创建一个Thread实例 private Thread thread1; //创建一个UdpClient实例 private UdpClient udpReceive; private UdpClient udpSend; private byte[] bytes; //private DialogResult result; private void btnPlay_Click(object sender, EventArgs e) { btnPlay.Enabled = false; btnStop.Enabled = true; ca = new Camera(pictureBox1.Handle, pictureBox1.Width, pictureBox1.Height); try { ca.StartWebCam(); } catch (Exception) { MessageBox.Show("未能初始化摄像头！", "错误", MessageBoxButtons.OK, MessageBoxIcon.Error); btnPlay.Enabled = true; btnStop.Enabled = false; ca = null; } } private void btnStop_Click(object sender, EventArgs e) { try { ca.CloseWebcam(); btnPlay.Enabled = true; btnStop.Enabled = false; } catch (Exception) { MessageBox.Show("摄像头关闭失败！", "错误", MessageBoxButtons.OK, MessageBoxIcon.Error); btnPlay.Enabled = true; btnStop.Enabled = false; ca = null; } } private void btnClose_Click(object sender, EventArgs e) { try { ca.CloseWebcam(); btnPlay.Enabled = true; btnStop.Enabled = false; } catch (Exception) { MessageBox.Show("摄像头关闭失败！", "错误", MessageBoxButtons.OK, MessageBoxIcon.Error); btnPlay.Enabled = true; btnStop.Enabled = false; ca = null; } //关闭程序 this.Close(); Application.Exit(); } private IPEndPoint ipLocalPoint; private EndPoint RemotePoint; private Socket mySocket; private bool RunningFlag = false; private void btnGetIP_Click(object sender, EventArgs e) { //string GetIP; //IPAddress[] AddressList = Dns.GetHostEntry(Dns.GetHostEntry()).AddressList; //if (AddressList.Length < 1) //{ // return ""; //} //return AddressList[0].ToString(); //this.tbGetIP.Text = Convert.ToInt32(AddressList); } //IP与端口号有效验证 private int getValidPort(string port) { int lport; //测试端口号是否有效 try { //是否为空 if (port == "") { throw new ArgumentException("端口号无效，不能启动UDP"); } lport = System.Convert.ToInt32(port); } catch(Exception e) { Console.WriteLine("无效的端口号"+ e.ToString()); this.tbGetPort.AppendText("无效的端口号"+ e.ToString()+"\n"); return -1; } return lport; } private IPAddress getValidIP(string ip) { IPAddress lip = null; //测试IP是否有效 try { //是否为空 if (!IPAddress.TryParse(ip, out lip)) { throw new ArgumentException("IP无效，不能启动UDP"); } } catch(Exception e) { Console.WriteLine("无效的IP："+ e.ToString()); this.tbGetIP.AppendText("无效的IP："+ e.ToString() +"\n"); return null; } return lip; } private void MainForm_Load(object sender, EventArgs e) { thread1 = new Thread(new ThreadStart()); thread1.Start(); } private void btnReceive_Click(object sender, EventArgs e) { //在本机指定的端口接收 udpReceive = new UdpClient(8001); //将套接字加入组播组 udpReceive.JoinMulticastGroup(IPAddress.Parse("224.100.0.10"), 50); //接收从远程主机发送过来的信息 IPEndPoint iep = new IPEndPoint(IPAddress.Any, 0); while (true) { //ref表示引用类型的 IPPoint实例接收消息 try { bytes = udpReceive.Receive(ref iep); } catch { DialogResult result = MessageBox.Show("发送失败！"); } string str = Encoding.UTF8.GetString(bytes, 0, bytes.Length); string message = "来自" + iep.ToString() + "的消息"; //显示消息 并以message为消息的标题 DialogResult res = MessageBox.Show(str, message); } } private void btnSend_Click_1(object sender, EventArgs e) { //初始化UdpClient udpSend = new UdpClient(); //实际使用时应将127.0.0.1改为服务器的远程IP IPAddress remoteIPAddress = IPAddress.Parse("127.0.0.1"); IPEndPoint remoteIPEndPoint = new IPEndPoint(remoteIPAddress, 8002); //将发送内容转换为字节数组 byte[] bytes = System.Text.Encoding.UTF8.GetBytes(); //设置重传次数 int retry = 0; while (true) { try { udpSend.Send(bytes, bytes.Length, remoteIPEndPoint); break; } catch { if (retry < 3) { retry++; continue; } else { DialogResult result = MessageBox.Show("发送失败！"); break; } } } } } }

视频封装类：

using System; using System.Collections.Generic; using System.Text; namespace Camera.avicap { /// <summary> /// Camera 的摘要说明。 /// </summary> public class Camera { private IntPtr lwndC; private IntPtr mControlPtr; private int mWidth; private int mHeight; // 构造函数 public Camera(IntPtr handle, int width, int height) { mControlPtr = handle; mWidth = width; mHeight = height; } // 帧回调的委托 public delegate void RecievedFrameEventHandler(byte[] data); public event RecievedFrameEventHandler RecievedFrame; private AviCapture.FrameEventHandler mFrameEventHandler; // 关闭摄像头 public void CloseWebcam() { this.capDriverDisconnect(this.lwndC); } // 开启摄像头 public void StartWebCam() { byte[] lpszName = new byte[100]; byte[] lpszVer = new byte[100]; AviCapture.capGetDriverDescriptionA(0, lpszName, 100, lpszVer, 100); this.lwndC = AviCapture.capCreateCaptureWindowA(lpszName, AviCapture.WS_VISIBLE + AviCapture.WS_CHILD, 0, 0, mWidth, mHeight, mControlPtr, 0); if (this.capDriverConnect(this.lwndC, 0)) { this.capPreviewRate(this.lwndC, 66); this.capPreview(this.lwndC, true); AviCapture.BITMAPINFO bitmapinfo = new AviCapture.BITMAPINFO(); bitmapinfo.bmiHeader.biSize = AviCapture.SizeOf(bitmapinfo.bmiHeader); bitmapinfo.bmiHeader.biWidth = this.mWidth; bitmapinfo.bmiHeader.biHeight = this.mHeight; bitmapinfo.bmiHeader.biPlanes = 1; bitmapinfo.bmiHeader.biBitCount = 24; this.capSetVideoFormat(this.lwndC, ref bitmapinfo, AviCapture.SizeOf(bitmapinfo)); this.mFrameEventHandler = new AviCapture.FrameEventHandler(FrameCallBack); this.capSetCallbackOnFrame(this.lwndC, this.mFrameEventHandler); AviCapture.SetWindowPos(this.lwndC, 0, 0, 0, mWidth, mHeight, 6); } } // 以下为私有函数 private bool capDriverConnect(IntPtr lwnd, short i) { return AviCapture.SendMessage(lwnd, AviCapture.WM_CAP_DRIVER_CONNECT, i, 0); } private bool capDriverDisconnect(IntPtr lwnd) { return AviCapture.SendMessage(lwnd, AviCapture.WM_CAP_DRIVER_DISCONNECT, 0, 0); } private bool capPreview(IntPtr lwnd, bool f) { return AviCapture.SendMessage(lwnd, AviCapture.WM_CAP_SET_PREVIEW, f, 0); } private bool capPreviewRate(IntPtr lwnd, short wMS) { return AviCapture.SendMessage(lwnd, AviCapture.WM_CAP_SET_PREVIEWRATE, wMS, 0); } private bool capSetCallbackOnFrame(IntPtr lwnd, AviCapture.FrameEventHandler lpProc) { return AviCapture.SendMessage(lwnd, AviCapture.WM_CAP_SET_CALLBACK_FRAME, 0, lpProc); } private bool capSetVideoFormat(IntPtr hCapWnd, ref AviCapture.BITMAPINFO BmpFormat, int CapFormatSize) { return AviCapture.SendMessage(hCapWnd, AviCapture.WM_CAP_SET_VIDEOFORMAT, CapFormatSize, ref BmpFormat); } private void FrameCallBack(IntPtr lwnd, IntPtr lpVHdr) { AviCapture.VIDEOHDR videoHeader = new AviCapture.VIDEOHDR(); byte[] VideoData; videoHeader = (AviCapture.VIDEOHDR)AviCapture.GetStructure(lpVHdr, videoHeader); VideoData = new byte[videoHeader.dwBytesUsed]; AviCapture.Copy(videoHeader.lpData, VideoData); if (this.RecievedFrame != null) this.RecievedFrame(VideoData); } } }

win32的avicap32.dll封装类

using System; using System.Collections.Generic; using System.Runtime.InteropServices; using System.Text; namespace Camera.avicap { /// <summary> /// AviCapture 的摘要说明。 /// </summary> public class AviCapture { //通过调用acicap32.dll进行读取摄像头数据 [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); //部分常量 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; // 结构 [StructLayout(LayoutKind.Sequential)] //VideoHdr 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)] //BitmapInfoHeader 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)] //BitmapInfo 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); // 公共函数 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); } } }

 

出处：https://bbs.csdn.net/topics/390039653

参考：

https://blog.csdn.net/NCTU_to_prove_safety/article/details/53584905

https://www.cnblogs.com/JUSTSOSOBLOG/p/4612801.html

https://blog.csdn.net/laolei1986/article/details/5730245

https://blog.csdn.net/waeceo/article/details/50222781

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我使用AVICAP32.DLL来捕获图像,捕完并保存到文件后,当我关闭它后.那个黑块的窗体一直在那里,如果让它消失呢?

哈哈哈,我自己搞定了,由于那个窗体是使用API调出来的,它只是位置和大小与PANEL一样而已,因此要想控制它还是要使用API消息机制.利用它的句柄来操作它.方法如下:

public const int WM_CLOSE = 0x10;//关闭窗口句柄 //关闭摄像头  if hWndC <> 0 then   begin    SendMessage(hWndC, WM_CAP_DRIVER_DISCONNECT, 0, 0);    SendMessage(hWndC, WM_CLOSE, 0, 0);    hWndC := 0;   end;OK,完事了.

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前面的代码有一个事件的处理是缺失的，就是Camera类的RecievedFrame事件；怎么把接收到的byte[] VideoData数组转成图片呢？

看看下面的文章，或许对你有所启发。

得到摄像头一帧数据的字节数组之后转成图片的处理