C#中对ActiveX控件的调用

2008-12-09 14:51

C#中对ActiveX控件的调用

发现MS.NET2003中缺少对一些动态链接库的引用！
在调用ActiveX等多媒体控件时，需要用到的MediaPlayer.dll 和 AxMediaPlayer.dll需要自己生成。
首先用下面的命令为媒体播放器控件：msdxm.ocx 生成 MediaPlayer.dll 和 AxMediaPlayer.dll。
aximp c:\winnt\system32\msdxm.ocx

而通常msdxm.ocx中的ActiveX控件都未注册!
再运行regsvr32 msdxm.ocx手动注册便生成需要的动态连接库文件.
再如图2所示，在项目中添加对MediaPlayer.dll 和 AxMediaPlayer.dll的引用；
并在程序中插入：using MediaPlayer便完成了整个调用过程！

播放器如图:

源程序代码如下：



            using System; 

            using System.Drawing; 

            using System.Collections; 

            using System.ComponentModel; 

            using System.Windows.Forms; 

            using System.Data; 

            using MediaPlayer; 

            

            namespace AdvancePlayer 

            { 

            /**//// <summary> 

            /// Form1 的摘要说明。 

            /// </summary> 

            public class Form1 : System.Windows.Forms.Form 

            { 

            private AxMediaPlayer.AxMediaPlayer axWindowsMediaPlayer1; 

            private System.Windows.Forms.OpenFileDialog openFileDialog1; 

            private System.Windows.Forms.MainMenu mainMenu1; 

            private System.Windows.Forms.MenuItem menuItemOpen; 

            private System.Windows.Forms.MenuItem menuItemClose; 

            private System.Windows.Forms.MenuItem menuItemInitSize; 

            private System.Windows.Forms.MenuItem menuItemFullScreen; 

            private System.Windows.Forms.MenuItem menuItemShowAudioCtrl; 

            private System.Windows.Forms.MenuItem menuItemShowPositionCtrl; 

            private System.Windows.Forms.MenuItem menuItemShowTrackbarCtrl; 

            private System.Windows.Forms.MenuItem menuItemFile; 

            private System.Windows.Forms.MenuItem menuItemVideo; 

            private System.Windows.Forms.MenuItem menuItemWindow; 

            

            

            /**//// <summary> 

            /// 必需的设计器变量。 

            /// </summary> 

            private System.ComponentModel.Container components = null; 

            

            public Form1() 

            { 

            // 

            // Windows 窗体设计器支持所必需的 

            // 

            InitializeComponent(); 

            

            // 

            // TODO: 在 InitializeComponent 调用后添加任何构造函数代码 

            // 

            } 

            

            /**//// <summary> 

            /// 清理所有正在使用的资源。 

            /// </summary> 

            protected override void Dispose( bool disposing ) 

            { 

            if( disposing ) 

            { 

            if (components != null) 

            { 

            components.Dispose(); 

            } 

            } 

            base.Dispose( disposing ); 

            } 

            

            Windows 窗体设计器生成的代码#region Windows 窗体设计器生成的代码 

            /**//// <summary> 

            /// 设计器支持所需的方法 - 不要使用代码编辑器修改 

            /// 此方法的内容。 

            /// </summary> 

            private void InitializeComponent() 

            { 

            System.Resources.ResourceManager resources = new System.Resources.ResourceManager(typeof(Form1)); 

            this.openFileDialog1 = new System.Windows.Forms.OpenFileDialog(); 

            this.mainMenu1 = new System.Windows.Forms.MainMenu(); 

            this.menuItemFile = new System.Windows.Forms.MenuItem(); 

            this.menuItemOpen = new System.Windows.Forms.MenuItem(); 

            this.menuItemClose = new System.Windows.Forms.MenuItem(); 

            this.menuItemVideo = new System.Windows.Forms.MenuItem(); 

            this.menuItemInitSize = new System.Windows.Forms.MenuItem(); 

            this.menuItemFullScreen = new System.Windows.Forms.MenuItem(); 

            this.menuItemWindow = new System.Windows.Forms.MenuItem(); 

            this.menuItemShowAudioCtrl = new System.Windows.Forms.MenuItem(); 

            this.menuItemShowPositionCtrl = new System.Windows.Forms.MenuItem(); 

            this.menuItemShowTrackbarCtrl = new System.Windows.Forms.MenuItem(); 

            this.axWindowsMediaPlayer1 = new AxMediaPlayer.AxMediaPlayer(); 

            ((System.ComponentModel.ISupportInitialize)(this.axWindowsMediaPlayer1)).BeginInit(); 

            this.SuspendLayout(); 

            // 

            // openFileDialog1 

            // 

            this.openFileDialog1.FileOk += new System.ComponentModel.CancelEventHandler(this.openFileDialog1_FileOk); 

            // 

            // mainMenu1 

            // 

            this.mainMenu1.MenuItems.AddRange(new System.Windows.Forms.MenuItem[] { 

            this.menuItemFile, 

            this.menuItemVideo, 

            this.menuItemWindow}); 

            // 

            // menuItemFile 

            // 

            this.menuItemFile.Index = 0; 

            this.menuItemFile.MenuItems.AddRange(new System.Windows.Forms.MenuItem[] { 

            this.menuItemOpen, 

            this.menuItemClose}); 

            this.menuItemFile.Shortcut = System.Windows.Forms.Shortcut.CtrlF; 

            this.menuItemFile.Text = "文件(&F)"; 

            // 

            // menuItemOpen 

            // 

            this.menuItemOpen.Index = 0; 

            this.menuItemOpen.Shortcut = System.Windows.Forms.Shortcut.CtrlO; 

            this.menuItemOpen.Text = "打开(&O)"; 

            this.menuItemOpen.Click += new System.EventHandler(this.menuItemOpen_Click); 

            this.menuItemOpen.Select += new System.EventHandler(this.Form1_Load); 

            // 

            // menuItemClose 

            // 

            this.menuItemClose.Index = 1; 

            this.menuItemClose.Shortcut = System.Windows.Forms.Shortcut.CtrlC; 

            this.menuItemClose.Text = "关闭(&C)"; 

            this.menuItemClose.Click += new System.EventHandler(this.menuItemClose_Click); 

            // 

            // menuItemVideo 

            // 

            this.menuItemVideo.Index = 1; 

            this.menuItemVideo.MenuItems.AddRange(new System.Windows.Forms.MenuItem[] { 

            this.menuItemInitSize, 

            this.menuItemFullScreen}); 

            this.menuItemVideo.Shortcut = System.Windows.Forms.Shortcut.CtrlV; 

            this.menuItemVideo.Text = "视频(&V)"; 

            // 

            // menuItemInitSize 

            // 

            this.menuItemInitSize.Index = 0; 

            this.menuItemInitSize.Shortcut = System.Windows.Forms.Shortcut.CtrlI; 

            this.menuItemInitSize.Text = "默认尺寸(&I)"; 

            this.menuItemInitSize.Click += new System.EventHandler(this.menuItemInitSize_Click); 

            // 

            // menuItemFullScreen 

            // 

            this.menuItemFullScreen.Index = 1; 

            this.menuItemFullScreen.Shortcut = System.Windows.Forms.Shortcut.CtrlF; 

            this.menuItemFullScreen.Text = "全屏(&F)"; 

            this.menuItemFullScreen.Click += new System.EventHandler(this.menuItemFullScreen_Click); 

            // 

            // menuItemWindow 

            // 

            this.menuItemWindow.Index = 2; 

            this.menuItemWindow.MenuItems.AddRange(new System.Windows.Forms.MenuItem[] { 

            this.menuItemShowAudioCtrl, 

            this.menuItemShowPositionCtrl, 

            this.menuItemShowTrackbarCtrl}); 

            this.menuItemWindow.Shortcut = System.Windows.Forms.Shortcut.CtrlW; 

            this.menuItemWindow.Text = "窗口(&W)"; 

            // 

            // menuItemShowAudioCtrl 

            // 

            this.menuItemShowAudioCtrl.Checked = true; 

            this.menuItemShowAudioCtrl.Index = 0; 

            this.menuItemShowAudioCtrl.Shortcut = System.Windows.Forms.Shortcut.CtrlU; 

            this.menuItemShowAudioCtrl.Text = "音频控制(&U)"; 

            this.menuItemShowAudioCtrl.Click += new System.EventHandler(this.menuItemShowAudioCtrl_Click); 

            // 

            // menuItemShowPositionCtrl 

            // 

            this.menuItemShowPositionCtrl.Checked = true; 

            this.menuItemShowPositionCtrl.Index = 1; 

            this.menuItemShowPositionCtrl.Shortcut = System.Windows.Forms.Shortcut.CtrlP; 

            this.menuItemShowPositionCtrl.Text = "播放进度(&P)"; 

            this.menuItemShowPositionCtrl.Click += new System.EventHandler(this.menuItemShowPositionCtrl_Click); 

            // 

            // menuItemShowTrackbarCtrl 

            // 

            this.menuItemShowTrackbarCtrl.Checked = true; 

            this.menuItemShowTrackbarCtrl.Index = 2; 

            this.menuItemShowTrackbarCtrl.Shortcut = System.Windows.Forms.Shortcut.CtrlT; 

            this.menuItemShowTrackbarCtrl.Text = "滚动条(&T)"; 

            this.menuItemShowTrackbarCtrl.Click += new System.EventHandler(this.menuItemShowTrackbarCtrl_Click); 

            // 

            // axWindowsMediaPlayer1 

            // 

            this.axWindowsMediaPlayer1.Location = new System.Drawing.Point(0, -8); 

            this.axWindowsMediaPlayer1.Name = "axWindowsMediaPlayer1"; 

            this.axWindowsMediaPlayer1.OcxState = ((System.Windows.Forms.AxHost.State)(resources.GetObject("axWindowsMediaPlayer1.OcxState"))); 

            this.axWindowsMediaPlayer1.Size = new System.Drawing.Size(296, 280); 

            this.axWindowsMediaPlayer1.TabIndex = 0; 

            // 

            // Form1 

            // 

            this.AutoScaleBaseSize = new System.Drawing.Size(6, 14); 

            this.BackColor = System.Drawing.SystemColors.Control; 

            this.ClientSize = new System.Drawing.Size(292, 273); 

            this.Controls.Add(this.axWindowsMediaPlayer1); 

            this.ForeColor = System.Drawing.SystemColors.ControlText; 

            this.Menu = this.mainMenu1; 

            this.Name = "Form1"; 

            this.Text = "Form1"; 

            this.Load += new System.EventHandler(this.Form1_Load); 

            ((System.ComponentModel.ISupportInitialize)(this.axWindowsMediaPlayer1)).EndInit(); 

            this.ResumeLayout(false); 

            

            } 

            #endregion 

            

            /**//// <summary> 

            /// 应用程序的主入口点。 

            /// </summary> 

            [STAThread] 

            static void Main() 

            { 

            Application.Run(new Form1()); 

            } 

            

            private void menuItemOpen_Click(object sender, System.EventArgs e) 

            { 

            openFileDialog1.Filter = "视频文件(*.avi;*.wmv;*.dat;*.mpg;*.mpeg;*.mov;*.wm;*.wma)|*.avi;*.wmv;*.dat;*.mpg;*.mpeg;*.mov;*.wm;*.wma|音频文件(*.wav;*.mp3;*.snd;*.au;*.midi;*.mid)|*.wav;*.mp3;*.snd;*.au;*.midi;*.mid|所有文件(*.*)|*.*"; 

            //打开的文件类型 

            if(openFileDialog1.ShowDialog()==DialogResult.OK) 

            { 

            axWindowsMediaPlayer1.FileName = openFileDialog1.FileName; 

            //如果打开的是音频文件，则禁止【视频】菜单组 

            if(openFileDialog1.FilterIndex == 2) 

            menuItemVideo.Enabled = false; 

            else 

            menuItemVideo.Enabled = true; 

            } 

            

            } 

            

            private void menuItemClose_Click(object sender, System.EventArgs e) 

            { 

            axWindowsMediaPlayer1.FileName = null; 

            menuItemVideo.Enabled = false; 

            } 

            

            private void menuItemInitSize_Click(object sender, System.EventArgs e) 

            { 

            axWindowsMediaPlayer1.DisplaySize = MPDisplaySizeConstants.mpDefaultSize; 

            } 

            

            private void menuItemFullScreen_Click(object sender, System.EventArgs e) 

            { 

            axWindowsMediaPlayer1.DisplaySize = MPDisplaySizeConstants.mpFullScreen; 

            } 

            

            private void menuItemShowAudioCtrl_Click(object sender, System.EventArgs e) 

            { 

            menuItemShowAudioCtrl.Checked = !menuItemShowAudioCtrl.Checked; 

            axWindowsMediaPlayer1.ShowTracker = false; 

            axWindowsMediaPlayer1.ShowTracker = menuItemShowTrackbarCtrl.Checked; 

            axWindowsMediaPlayer1.ShowAudioControls = menuItemShowAudioCtrl.Checked; 

            } 

            

            private void menuItemShowPositionCtrl_Click(object sender, System.EventArgs e) 

            { 

            menuItemShowPositionCtrl.Checked = !menuItemShowPositionCtrl.Checked; 

            axWindowsMediaPlayer1.ShowPositionControls = menuItemShowPositionCtrl.Checked; 

            } 

            

            private void menuItemShowTrackbarCtrl_Click(object sender, System.EventArgs e) 

            { 

            menuItemShowTrackbarCtrl.Checked = !menuItemShowTrackbarCtrl.Checked; 

            axWindowsMediaPlayer1.ShowAudioControls = false; 

            axWindowsMediaPlayer1.ShowTracker = menuItemShowTrackbarCtrl.Checked; 

            axWindowsMediaPlayer1.ShowAudioControls = menuItemShowAudioCtrl.Checked; 

            } 

            

            private void openFileDialog1_FileOk(object sender, System.ComponentModel.CancelEventArgs e) 

            { 

            

            openFileDialog1.OpenFile(); 

            } 

            

            private void Form1_Load(object sender, System.EventArgs e) 

            { 

            

            } 

            } 

            }

（图2）

如图2中选中的AxMediaPlayer和MediaPlayer既需自己生成的dll，2003系统默认中无迹可寻！他们所起的作用便是实现对ActiceX中播放器相关的函数的调用！
所以，对于多媒体应用程序的编写，关键在于了解对ActiveX相关控件的调用过程！

充分使用.NET中的控件技术，无疑是最直接和最高效的选择，这给我们提供了很大的方便，以往很多需要自己编写的函数和功能，现在都为我们封装成了各种控件，直接调用便可实现！相比往日，效率提高了不少！但其中相关的实现过程和细节还是应该多加了解才好，毕竟，只有让其工作原理烂熟于心，才能将.NET这门强大的技术运用得炉火纯青！