C#中对ActiveX控件的调用

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！