DIY - 智能小車：用 Microsoft Visual C++/CLI 編寫 Web Cam 程式碼 (四十)

DIY - 智能小車：用 Microsoft Visual C++/CLI 編寫 Web Cam 程式碼 (四十)： 

AForge.NET 是計算機視覺和人工智能庫 （Library），筆者使用 Microsoft Visual C++/CLI 編寫Web Cam 程式碼，直接呼叫 AForge 的動態連結程式庫（DLL），創建 MJPEG Stream ，打開 Video Source 便可以取得影像。

Web Cam 程式

03_CLI_AForge_ipcam C++/CLI Form1.c 程式：

// Form1.cs 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; using System.Diagnostics; using AForge.Video; using AForge.Video.DirectShow; namespace _02_AFroge_ipcam {     public partial class Form1 : Form     {          private Stopwatch stopWatch = null;         // Class constructor         public Form1()         {             InitializeComponent();         }         private void MainForm_FormClosing(object sender, FormClosingEventArgs e)         {             CloseCurrentVideoSource();         }         private void button2_Click(object sender, EventArgs e)         {             this.Close();         }         private void button1_Click(object sender, EventArgs e)         {             // create video source             MJPEGStream mjpegSource = new MJPEGStream("http://192.168.0.108:8080/?action=stream");             // open it             OpenVideoSource(mjpegSource);         }         // Open video source         private void OpenVideoSource( IVideoSource source )         {             // set busy cursor             this.Cursor = Cursors.WaitCursor;             // stop current video source             CloseCurrentVideoSource( );             // start new video source             videoSourcePlayer.VideoSource = source;             videoSourcePlayer.Start( );             // reset stop watch             stopWatch = null;             // start timer             timer.Start( );             this.Cursor = Cursors.Default;         }         // Close video source if it is running         private void CloseCurrentVideoSource( )         {             if ( videoSourcePlayer.VideoSource != null )             {                 videoSourcePlayer.SignalToStop( );                 // wait ~ 3 seconds                 for ( int i = 0; i < 30; i++ )                 {                     if ( !videoSourcePlayer.IsRunning )                         break;                     System.Threading.Thread.Sleep( 100 );                 }                 if ( videoSourcePlayer.IsRunning )                 {                     videoSourcePlayer.Stop( );                 }                 videoSourcePlayer.VideoSource = null;             }         }         // New frame received by the player         private void videoSourcePlayer_NewFrame( object sender, ref Bitmap image )         {             DateTime now = DateTime.Now;             Graphics g = Graphics.FromImage( image );             // paint current time             SolidBrush brush = new SolidBrush( Color.Red );             g.DrawString( now.ToString( ), this.Font, brush, new PointF( 5, 5 ) );             brush.Dispose( );             g.Dispose( );         }         // On timer event - gather statistics         private void timer_Tick( object sender, EventArgs e )         {             IVideoSource videoSource = videoSourcePlayer.VideoSource;             if ( videoSource != null )             {                 // get number of frames since the last timer tick                 int framesReceived = videoSource.FramesReceived;                 if ( stopWatch == null )                 {                     stopWatch = new Stopwatch( );                     stopWatch.Start( );                 }                 else                 {                     stopWatch.Stop( );                     float fps = 1000.0f * framesReceived / stopWatch.ElapsedMilliseconds;                     //fpsLabel.Text = fps.ToString( "F2" ) + " fps";                     stopWatch.Reset( );                     stopWatch.Start( );                 }             }         }     } // public partial class Form1 : Form }

偵錯 → 開始偵錯（F5）

顯示 Web Cam 的圖像！

2013年6月17日 天氣報告

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