先写个wcf的svc服务
有个方法叫TestImage，返回一个图片的二进制数据
写好服务能用之后开始ActionScript的实现

先在build path里加入fiber.swc
我的fiber.swc路径是C:Program FilesAdobeAdobe Flash Builder 4pluginscom.adobe.flexbuilder.dcrad_4.0.0.272416dcradSwcs4.0libsfiber.swc

然后是代码

package WebService

{
import com.adobe.fiber.core.model_internal;
import com.adobe.fiber.services.wrapper.WebServiceWrapper;
import flash.events.Event;
import flash.events.IOErrorEvent;
import flash.filesystem.File;
import flash.filesystem.FileMode;
import flash.filesystem.FileStream;
import flash.net.URLLoader;
import flash.net.URLRequest;
import flash.net.URLRequestMethod;
import flash.net.URLVariables;
import flash.utils.ByteArray;
import mx.rpc.AbstractOperation;
import mx.rpc.AsyncToken;
import mx.rpc.events.ResultEvent;
import mx.rpc.soap.mxml.WebService;
public class ImageTest extends WebServiceWrapper
{
  public function ImageTest()
  {
    _serviceControl = new WebService();
    //load wsdl
    _serviceControl.loadWSDL("http://192.168.0.2:8080/EpubService/Service1.svc?wsdl");
    model_internal::initialize();
    getImage();
  }
  public function getImage():void
  {
    var operation:AbstractOperation = _serviceControl.getOperation("TestImage");
    operation.addEventListener(ResultEvent.RESULT,onresult);
    operation.send();
  }
  private function onresult(e:ResultEvent):void
  {
    var imgByte:ByteArray = e.result as ByteArray;
    var f:File = File.documentsDirectory.resolvePath("test.jpg");
    var fs:FileStream = new FileStream();
    try
    {
      //open file in write mode
      fs.open(f,FileMode.WRITE);
      //write bytes from the byte array
      fs.writeBytes(imgByte);
      trace("create file: "+f.nativePath);
    }
    catch(e:Error)
    {
      trace(e.message);
    }
    finally
    {
      //close the file
      fs.close();
    }
    }
  }
}

输出：

create file: C:UsersQingDocumentstest.jpg