asp.net – 如何在Dotnetnuke中更改Radcaptcha的音频文件

<httphandlers>
    <add path="Telerik.Web.UI.WebResource.axd" type="Telerik.Web.UI.WebResource" verb="*" validate="false" /> 
</httphandlers>
<handlers>
    <add name="Telerik_Web_UI_WebResource_axd" verb="*" preCondition="integratedMode" path="Telerik.Web.UI.WebResource.axd" type="Telerik.Web.UI.WebResource" /> 
</handlers>

另外,我在他们的文档中发现了以下信息：

In order for the Captcha to be able to output an audio file the web
application must be run in a full trust environment. Basically the
application should run as a user account that has permissions to call
the SpeechSynthesizer.Speak(textToSpeak) method on the server. Usually
the user account does not have the needed permissions and the
administrator has to grant them. For example in IIS 6+ the Application
Pools run as the ApplicationPoolIdentity built-in account (this is by
default) which does not have enough permissions to call
SpeechSynthesizer.Speak(textToSpeak). To be able to generate the code
the Application Pools should have permissions as the LocalSystem
built-in account.

但是也有一个替代方案：

In case the web application does not have enough permissions to
“Speak” the text code or it uses .NET2.x (earlier than 3.0 versions of
.NET Framework),the audio file will be generated by concatenation of
“.wav” files that correspond to the specific character from the text
code. By default RadCaptcha will look for the files in the
App_DataRadCaptcha directory,so you need to supply the folder and
the files. You can copy the App_DataRadCaptcha directory located in
the App_Data folder of your RadControls for ASP.NET AJAX installation.
Please note that in order for the audio code to be generated
correctly,there must be a “.wav” file for every possible character
that can appear on the image and the file must be named as the
character itself – “[Char]”.wav (i.e. A.wav,B.wav,C.wav,1.wav,
2.wav etc.).

http://www.telerik.com/help/aspnet-ajax/captcha_audio.html