我正在尝试从Windows Mobile 6.5紧凑框架客户端调用服务。这给了我异常“无法从传输连接中读取数据”。
我使用的模拟器是Windows mobile 6专业模拟器。 Dotnet框架3.模拟器连接到互联网。我可以从互联网上打开网页。如果创建C＃Windows控制台应用程序，相同的代码运行正常。请指导。
WebRequest Webrequest;
HttpWebResponse response=null;
Webrequest = WebRequest.Create("http://api.geonames.org/postalCodeSearchJSON?postalcode=9011&maxRows=10&username=demo");
Webrequest.Method = "GET";
Webrequest.ContentType = "html/xml";
try
{
response = (HttpWebResponse)Webrequest.GetResponse();
}catch(Exception exc){
ShowErrorMessage("Ex : " + exc.Message);
return;
}
Stream streamResponse = response.GetResponseStream();
StreamReader streamReader = new StreamReader(streamResponse);
string responseStr = streamReader.ReadToEnd();
答案 0 :(得分：0)
我不知道你的代码到底出了什么问题。可能您必须在发出Web请求之前设置一些属性。这是我用于从Web服务获取时区信息的片段：
/// <summary>
/// This will call the webservice asynchronousely
/// the call will immediately return
/// The answer on the request is published to all event subscribers
/// </summary>
/// <param name="lat">decimal input for geographic Latitude</param>
/// <param name="lng">decimal input for geographic Longitude</param>
public void startRequest(string lat, string lng)
{
//tzInfos pTZinfos = new tzInfos();
string myURL = @"http://ws.geonames.org/" + _webMethodName;
//HttpWebRequest webRequest = (HttpWebRequest)HttpWebRequest.Create(myURL);
//HttpWebResponse webResponse = (HttpWebResponse)webRequest.GetResponse();
//string wsdl = "";
_webServiceURI = myURL;
try
{
_httpRequest = (HttpWebRequest)HttpWebRequest.Create(this._webServiceURI + "?lat=" + lat + "&lng=" + lng); // "?WSDL");
_httpRequest.Method = "POST";
_httpRequest.KeepAlive = false;
_httpRequest.ContentType = "application/x-www-form-urlencoded";
//httpRequest.ContentLength = requestData.Length;
_httpRequest.Timeout = 30000;
//async call
IAsyncResult myAsycnCall = this._httpRequest.BeginGetResponse(new AsyncCallback(this.ResponseReceivedHandler), null);
}
catch (WebException wx)
{
System.Diagnostics.Debug.WriteLine("Exception: " + wx.Message);
}
catch (Exception wx)
{
System.Diagnostics.Debug.WriteLine("Exception: " + wx.Message);
}
}
/// <summary>
/// This is the async method for the response to be get from the web service
/// </summary>
/// <param name="result"></param>
private void ResponseReceivedHandler(IAsyncResult result)
{
string wsdl = "";
geonamesTZfields pTZinfos = new geonamesTZfields();
geonamesEventArgs tArg = new geonamesEventArgs();
try
{
HttpWebResponse response = (HttpWebResponse)this._httpRequest.EndGetResponse(result);
System.IO.Stream streamResponse = response.GetResponseStream();
System.IO.StreamReader streamRead = new System.IO.StreamReader(streamResponse);
wsdl = streamRead.ReadToEnd();
System.Diagnostics.Debug.WriteLine("Response: " + wsdl);
// Close the stream object
streamResponse.Close();
streamRead.Close();
// Release the HttpWebResponse
response.Close();
if (wsdl.Length > 0)
{
StringBuilder sb = new StringBuilder(wsdl);
pTZinfos.strCountryCode = xml_helper.xml_helper.getStrSetting(sb, "countryCode");
pTZinfos.strCountryName = xml_helper.xml_helper.getStrSetting(sb, "countryName");
pTZinfos.strTimezoneID = xml_helper.xml_helper.getStrSetting(sb, "timezoneId");
pTZinfos.gmtOffset = xml_helper.xml_helper.getDecimalSetting(sb, "gmtOffset");
pTZinfos.rawOffset = xml_helper.xml_helper.getDecimalSetting(sb, "rawOffset");
pTZinfos.dstOffset = xml_helper.xml_helper.getDecimalSetting(sb, "dstOffset");
pTZinfos.tzTime = xml_helper.xml_helper.getDateTimeSetting(sb, "time");
}
_tzFields = pTZinfos;
//fire the event
tArg.m_myEventArgumentdata = pTZinfos;
tArg.m_myEventArgumentdata.DataIsValid = true;
tArg.m_myEventArgumentdata.strLastError = "no error";
}
catch (WebException wx)
{
tArg.m_myEventArgumentdata.DataIsValid = false;
tArg.m_myEventArgumentdata.strLastError = wx.Message;
}
catch (Exception ex)
{
tArg.m_myEventArgumentdata.DataIsValid = false;
tArg.m_myEventArgumentdata.strLastError = ex.Message;
}
finally
{
this.onDataReceived(tArg); //notify all subscribers of new data arrived
}
}
你看我明确地设置了一些属性： _httpRequest.Method =“POST”; _httpRequest.KeepAlive = false; _httpRequest.ContentType =“application / x-www-form-urlencoded”; //httpRequest.ContentLength = requestData.Length; _httpRequest.Timeout = 30000; 我的文章可在http://www.hjgode.de/wp/2010/03/04/using-ws-geonames-org-timezone-webservice-without-wsdl/处找到完整的代码。您可以使用它并更改您的Web请求并使用异步调用。
您也可以尝试在设备上的Internet Explorer Mobile中轻松打开网页：http://api.geonames.org/postalCodeSearchJSON?postalcode=9011&maxRows=10&username=demo。你应该得到答案：
{“postalCodes”：[{“adminCode3”：“3203”，“adminName2”：“Wahlkreis St. Gallen”，“adminName3”：“圣加仑”，“adminCode2”：“1721”，“adminCode1” ：“SG”，“postalCode”：“9011”，“countryCode”：“CH”，“lng”：9.399845287638328，“placeName”：“St.Gallen”，“lat”：47.414775553450646，“adminName1”：“Kanton St .Gallen“}，{”adminCode1“：”GS“，”postalCode“：”9011“，”countryCode“：”HU“，”lng“：17.781944437499998，”placeName“：”Győr“，”lat“：47.607638900000005， “adminName1”： “杰尔 - 莫松 - 肖普朗”}，{ “adminName2”： “特罗姆瑟”， “adminCode2”： “1902”， “adminCode1”： “19”， “POSTALCODE”： “9011”， “COUNTRYCODE”： “NO”， “LNG”：18.95508， “地名”： “特罗姆瑟”， “ISO3166-2”： “10”， “LAT”：69.6489 “adminName1”： “特罗姆斯”}，{ “POSTALCODE”：“L -9011" ， “COUNTRYCODE”： “LU”， “LNG”：6.1041667， “地名”： “的Ettelbruck”， “LAT”：49.8475}，{ “adminCode1”： “Z”， “POSTALCODE”： “9011”， “countryCode”：“AR”，“lng”： - 67.5333333，“placeName”：“CALETA OLIVIA”，“lat”： - 46.4333333，“adminName1”：“SANTA CRUZ”}，{“adminCode1”：“Z”， “postalCode”：“9011”，“countryCode”：“AR”，“lng”： - 67.5333333，“placeName”：“EL MANGRULLO”，“lat”： - 46.4 333333，“adminName1”：“SANTA CRUZ”}，{“adminCode1”：“Z”，“postalCode”：“9011”，“countryCode”：“AR”，“lng”： - 67.5333333，“placeName”：“CAÑADON ESTHER“，”lat“： - 46.4333333，”adminName1“：”SANTA CRUZ“}，{”adminCode1“：”Z“，”postalCode“：”9011“，”countryCode“：”AR“，”lng“： - 67.5333333，“placeName”：“BAHIA LANGARA”，“lat”： - 46.4333333，“adminName1”：“SANTA CRUZ”}，{“postalCode”：“9011”，“countryCode”：“NZ”，“lng”：170.47198 “地名”： “莫宁”， “LAT”： - 45.87922}，{ “POSTALCODE”： “9011”， “COUNTRYCODE”： “PH”， “LNG”：124.7325， “地名”： “Balinguan”，“LAT “：9.050317457142857}]}
如果Internet Explorer Mobile中没有，则表明您的连接设置不正确。对于WMDC连接设置，请参阅“此计算机连接到”。从Internet切换到自动可能会有所帮助。我假设你已经停靠了你使用的模拟器，WMDC或ActiveSync显示了与模拟器的连接。
答案 1 :(得分：0)
class ServiceConnection
{
public string Url = "";
private string postXml;
public delegate void OnServerEndResponse(string response, int statusCode);
public event OnServerEndResponse OnEndResponse;
public ServiceConnection(string serviceName, string userName, string pwd)
public void SendRequest(string requestXml)
{
postXml = requestXml;
StartWebService();
}
public void StartWebService()
{
WebRequest request = WebRequest.Create(Url);
request.Method = "GET";
byte[] auth = Encoding.UTF8.GetBytes(UserName + ":" + Pwd);
request.Headers["Authorization"] = "Basic " + System.Convert.ToBase64String(auth);
request.BeginGetResponse(new AsyncCallback(GetResponseCallback), request);
}
void GetResponseCallback(IAsyncResult asynchronousResult)
{
HttpWebResponse response = null;
HttpWebRequest webRequest = null;
try
{
webRequest = (HttpWebRequest)asynchronousResult.AsyncState;
response = (HttpWebResponse)webRequest.EndGetResponse(asynchronousResult);
Stream streamResponse = response.GetResponseStream();
StreamReader streamReader = new StreamReader(streamResponse);
StringBuilder sb = new StringBuilder();
sb.Append(streamReader.ReadToEnd());
//string serverResponse = streamReader.ReadToEnd();
streamResponse.Close();
streamReader.Close();
response.Close();
OnEndResponse(sb.ToString(), Convert.ToInt32(response.StatusCode));
}
catch (Exception ex)
{
if (ex.Message == "The remote server returned an error: (401) Unauthorized.")
OnEndResponse(ex.Message, 401);
else if (ex.Message == "Unable to connect to the remote server")
OnEndResponse(ex.Message, 4);
else if (ex.Message == "Could not establish connection to network.")
OnEndResponse(ex.Message, 10000);
else
OnEndResponse("Error in network", 10001);
}
}
}