在调用wcf webservice方法时，会出现错误IllegalArgumentException：size＆lt; = 0

Question

在我的应用程序中，我调用wcf webservice方法通过base 64发送图像...在调用该方法后，我收到错误：

03-17 12:02:13.187: W/System.err(5822): java.lang.IllegalArgumentException: size <= 0
03-17 12:02:13.195: W/System.err(5822):     at java.io.BufferedInputStream.<init>(BufferedInputStream.java:94)
03-17 12:02:13.195: W/System.err(5822):     at org.ksoap2.transport.HttpTransportSE.call(HttpTransportSE.java:226)
03-17 12:02:13.195: W/System.err(5822):     at org.ksoap2.transport.HttpTransportSE.call(HttpTransportSE.java:114)
03-17 12:02:13.195: W/System.err(5822):     at com.android.lntproject.SOAPWebservice.Base64ToImage(SOAPWebservice.java:982)
03-17 12:02:13.195: W/System.err(5822):     at com.android.mobescan.ImageUtils.getCompressedImagePath(ImageUtils.java:119)
03-17 12:02:13.195: W/System.err(5822):     at com.android.mobescan.HomeActivity$UploadScan.doInBackground(HomeActivity.java:537)
03-17 12:02:13.195: W/System.err(5822):     at com.android.mobescan.HomeActivity$UploadScan.doInBackground(HomeActivity.java:1)
03-17 12:02:13.195: W/System.err(5822):     at android.os.AsyncTask$2.call(AsyncTask.java:287)
03-17 12:02:13.195: W/System.err(5822):     at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:305)
03-17 12:02:13.203: W/System.err(5822):     at java.util.concurrent.FutureTask.run(FutureTask.java:137)
03-17 12:02:13.203: W/System.err(5822):     at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:230)
03-17 12:02:13.203: W/System.err(5822):     at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1076)
03-17 12:02:13.203: W/System.err(5822):     at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:569)
03-17 12:02:13.210: W/System.err(5822):     at java.lang.Thread.run(Thread.java:856)

该方法写为：

public SoapPrimitive Base64ToImage(String base64String, String imgName) {
    SoapPrimitive result = null;

    try {
        SoapObject request = new SoapObject("http://tempuri.org/",
                "Base64ToImage");

        request.addProperty("base64String", base64String);
        request.addProperty("imgName", imgName);

        SoapSerializationEnvelope envelope = new SoapSerializationEnvelope(
                SoapEnvelope.VER11);// soap envelop with version
        envelope.setOutputSoapObject(request); // set request object
        envelope.dotNet = true;

        HttpTransportSE androidHttpTransport = new HttpTransportSE(url1);// http
                                                                        // transport
                                                                        // call
        androidHttpTransport.call(
                "http://tempuri.org/IService/Base64ToImage", envelope);

        // response soap object

        result = (SoapPrimitive) envelope.getResponse();
        Log.e("Base64ToImage", result.toString());

    } catch (Exception e) {
        e.printStackTrace();
    }

    return result;

}

我无法弄清楚究竟是什么问题。

请帮忙！提前谢谢！