C#中对ActiveX控件的调用

调用ActiveX控件编写播放器时,遇到了不少问题!

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)

{

//

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！

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