Flash AS2 - 處理丟失的聲卡

Question

在我的AS2 Flash遊戲中，我會播放多個聲音文件，然後等待「onSoundComplete」消息/函數再繼續。

問題是如果系統中沒有聲卡（或者它在設備管理器中被禁用） - 一切都像它工作（沒有錯誤，onLoad處理程序獲取「真」） - 但聲音從未真正獲取發揮，因此，我的事件永遠不會被觸發。

我已經計劃通過掛鉤我的聲音代碼來解決這個問題，如果我沒有檢測到聲卡，只需啓動計時器等待幾秒鐘，然後手動啓動「onSoundComplete」函數。

唯一的問題是，我無法可靠地找到一種方法來確定系統中是否有聲卡！

順便說一句 - AS3似乎是由傳回一個空的SoundChannel很好地處理這個問題 - 不幸的是，我停留在AS2.0

Answer 1

您應該能夠使用System.capabilities

下面是一個例子音頻：

var userAudio:Boolean = System.capabilities.hasAudio; 
trace("YOUR SYSTEM HAS AUDIO:"); 
trace(userAudio); 

這裏是所有屬性的來源：http://www.actionscript.org/forums/showthread.php3?t=39727：

// Camera and Microphone check 
var userCamMic:Boolean = System.capabilities.avHardwareDisable; 
trace("YOUR CAMERA AND MICROPHONE ARE ENABLED:"); 
trace(userCamMic); 
// Flash player supports communication to Accessibility Aids 
var userAccess:Boolean = System.capabilities.hasAccessibility; 
trace("YOUR FLASH PLAYER SUPPORTS COMMUNICATION TO ACCESSIBILITY AIDS:"); 
trace(userAccess); 
// Checking to see if you have audio 
var userAudio:Boolean = System.capabilities.hasAudio; 
trace("YOUR SYSTEM HAS AUDIO:"); 
trace(userAudio); 
// Checking to see if you have an audio encoder for streaming 
var userAudioEnc:Boolean = System.capabilities.hasAudioEncoder; 
trace("YOUR SYSTEM HAS AN AUDIO ENCODER, THUS ALLOWING STREAMING:"); 
trace(userAudioEnc); 
// Checking to see if your system has embedded video capabilities 
var userEmbVideo:Boolean = System.capabilities.hasEmbeddedVideo; 
trace("YOUR SYSTEM ALLOWS FOR EMBEDDED VIDEO:"); 
trace(userEmbVideo); 
// Checking to see if your system has an MP3 decoder 
var userMP3:Boolean = System.capabilities.hasMP3; 
trace("YOUR SYSTEM HAS AN MP3 DECODER:"); 
trace(userMP3); 
// Checking to see if your system supports printing 
var userPrint:Boolean = System.capabilities.hasPrinting; 
trace("YOUR SYSTEM SUPPORTS PRINTING:"); 
trace(userPrint); 
// Checking to see if your system supports development of screen broadcast 
// applications to be run through Flash Communication Server 
var userScrnBrd:Boolean = System.capabilities.hasScreenBroadcast; 
trace("YOUR SYSTEM SUPPORTS DEVELOPMENT OF SCREEN BROADCAST APPLICATIONS TO BE RUN 
THROUGH FLASH COMMUNICATION SERVER:"); 
trace(userScrnBrd); 
// Checking to see if your system supports playback of screen broadcast 
// applications that are running from Flash Communication Server 
var userScrnPlay:Boolean = System.capabilities.hasScreenPlayback; 
trace("YOUR SYSTEM SUPPORTS PLAYBACK OF SCREEN BROADCAST APPLICATIONS THAT ARE 
RUNNING FROM FLASH COMMUNICATION SERVER:"); 
trace(userScrnPlay); 
// Checking to see if your system can play streaming audio 
var userStrmAud:Boolean = System.capabilities.hasStreamingAudio; 
trace("YOUR SYSTEM CAN PLAY STREAMING AUDIO:"); 
trace(userStrmAud); 
// Checking to see if your system can play streaming video 
var userStrmVid:Boolean = System.capabilities.hasStreamingVideo; 
trace("YOUR SYSTEM CAN PLAY STREAMING VIDEO:"); 
trace(userStrmVid); 
// Checking to see if your system can encode streaming video 
var userVidEnc:Boolean = System.capabilities.hasVideoEncoder; 
trace("YOUR SYSTEM CAN ENCODE STREAMING VIDEO:"); 
trace(userVidEnc); 
// Checking to see if your player is officially released (false) or a debugging version (true) 
var userDebug:Boolean = System.capabilities.isDebugger; 
trace("YOUR PLAYER IS A DEBUGGING VERSION:"); 
trace(userDebug); 
// What language is your player running 
var userLang:String = System.capabilities.language; 
trace("YOUR PLAYER IS RUNNING ON THIS LANGUAGE (see Actionscript 'Reference' for language list. 
Example: 'en' is English):"); 
trace(userLang); 
// Checking to see if player is attempting to read anything from hard disk 
var userLocFile:Boolean = System.capabilities.localFileReadDisable; 
trace("YOUR PLAYER IS ATTEMPTING TO READ FROM YOUR HARD DISK:"); 
trace(userLocFile); 
// Checking to see the manufacturer of your Flash player 
var userManu:String = System.capabilities.manufacturer; 
trace("YOUR FLASH PLAYER IS MANUFACTURED BY:"); 
trace(userManu); 
// Checking to see what operating system user is running 
var userOS:String = System.capabilities.os; 
trace("YOUR OPERATING SYSTEM IS:"); 
trace(userOS); 
// Checking the pixel aspect ratio of user screen 
var userPAR:Number = System.capabilities.pixelAspectRatio; 
trace("THE PIXEL ASPECT RATIO OF YOUR SCREEN IS:"); 
trace(userPAR); 
// Checking to see what player the user system is using 
var userPlayType:String = System.capabilities.playerType; 
trace("THE PLAYER YOUR SYSTEM IS RUNNING IS:"); 
trace(userPlayType); 
// Checking to see what color user screen is running 
var userScrnCol:String = System.capabilities.screenColor; 
trace("YOUR SYSTEM IS RUNNING THIS COLOR (color, gray, bw):"); 
trace(userScrnCol); 
// Checking to see what the users screen DPI is 
var userDPI:Number = System.capabilities.screenDPI; 
trace("YOUR SCREEN DPI (DOTS PER INCH) IS:"); 
trace(userDPI); 
// User screen resolution 
var userScreenX:Number = System.capabilities.screenResolutionX; 
var userScreenY:Number = System.capabilities.screenResolutionY; 
trace("YOUR MONITOR RESOLUTION IS:"); 
trace(userScreenX+" x "+userScreenY); 
// Creating URL code for users system capabilites 
var userServStr:String = System.capabilities.serverString; 
trace("THE URL CODE FOR YOUR USER SYSTEM CAPABILITIES IS:"); 
trace(userServStr); 
// Checking to see what Flash player version user is running 
var userVersion:String = System.capabilities.version; 
trace("YOUR FLASH PLAYER VERSION IS:"); 
trace(userVersion); 
// Checking to see if user has disabled windowless mode 
var userWinDis:Boolean = System.capabilities.windowlessDisable; 
trace("YOU HAVE DISABLED WINDOWLESS MODE:"); 
trace(userWinDis); 
// Checking to super domain or exact domain is set 
var userExacSet:Boolean = System.exactSettings; 
trace("YOU HAVE SUPER DOMAIN SETTINGS:"); 
trace(userExacSet);