private string GetRequestUrl(SharpMap.Geometries.BoundingBox box, TileSet tileSet)
{
SharpMap.Web.Wms.Client.WmsOnlineResource resource = GetPreferredMethod();
System.Text.StringBuilder strReq = new StringBuilder(resource.OnlineResource);
if (!resource.OnlineResource.Contains("?"))
{
strReq.Append("?");
}
if (!strReq.ToString().EndsWith("&") && !strReq.ToString().EndsWith("?"))
{
strReq.Append("&");
}
strReq.AppendFormat(SharpMap.Map.numberFormat_EnUS, "&REQUEST=GetMap&BBOX={0},{1},{2},{3}",
box.Min.X, box.Min.Y, box.Max.X, box.Max.Y);
strReq.AppendFormat("&WIDTH={0}&Height={1}", tileSet.Width, tileSet.Height);
strReq.Append("&LAYERS="); // LAYERS is set in caps because the current version of tilecache.py does not accept mixed case (a little bug)
if (tileSet.Layers != null && tileSet.Layers.Count > 0)
{
foreach (string layer in tileSet.Layers)
{
strReq.AppendFormat("{0},", layer);
}
strReq.Remove(strReq.Length - 1, 1);
}
strReq.AppendFormat("&FORMAT={0}", tileSet.Format);
if (_WmsClient.WmsVersion == "1.3.0")
{
strReq.AppendFormat("&CRS={0}", tileSet.Srs);
}
else
{
strReq.AppendFormat("&SRS={0}", tileSet.Srs);
}
strReq.AppendFormat("&VERSION={0}", _WmsClient.WmsVersion);
if (tileSet.Styles != null && tileSet.Styles.Count > 0)
{
strReq.Append("&STYLES=");
foreach (string style in tileSet.Styles)
{
strReq.AppendFormat("{0},", style);
}
strReq.Remove(strReq.Length - 1, 1);
}
if (_CustomParameters != null && _CustomParameters.Count > 0)
{
foreach (string name in _CustomParameters.Keys)
{
string value = _CustomParameters[name];
strReq.AppendFormat("&{0}={1}", name, value);
}
}
return(strReq.ToString());
}
/// <summary>
/// Gets the URL for a map request base on current settings, the image size and boundingbox
/// </summary>
/// <param name="box">Area the WMS request should cover</param>
/// <param name="size">Size of image</param>
/// <returns>URL for WMS request</returns>
public string GetRequestUrl(IEnvelope box, System.Drawing.Size size)
{
SharpMap.Web.Wms.Client.WmsOnlineResource resource = GetPreferredMethod();
System.Text.StringBuilder strReq = new StringBuilder(resource.OnlineResource);
if (!resource.OnlineResource.Contains("?"))
{
strReq.Append("?");
}
if (!strReq.ToString().EndsWith("&") && !strReq.ToString().EndsWith("?"))
{
strReq.Append("&");
}
strReq.AppendFormat(SharpMap.Map.numberFormat_EnUS, "REQUEST=GetMap&BBOX={0},{1},{2},{3}",
box.MinX, box.MinY, box.MaxX, box.MaxY);
strReq.AppendFormat("&WIDTH={0}&Height={1}", size.Width, size.Height);
strReq.Append("&Layers=");
if (_LayerList != null && _LayerList.Count > 0)
{
foreach (string layer in _LayerList)
{
strReq.AppendFormat("{0},", layer);
}
strReq.Remove(strReq.Length - 1, 1);
}
strReq.AppendFormat("&FORMAT={0}", _MimeType);
if (_SpatialReferenceSystem == string.Empty)
{
throw new ApplicationException("Spatial reference system not set");
}
if (wmsClient.WmsVersion == "1.3.0")
{
strReq.AppendFormat("&CRS={0}", _SpatialReferenceSystem);
}
else
{
strReq.AppendFormat("&SRS={0}", _SpatialReferenceSystem);
}
strReq.AppendFormat("&VERSION={0}", wmsClient.WmsVersion);
strReq.Append("&Styles=");
if (_StylesList != null && _StylesList.Count > 0)
{
foreach (string style in _StylesList)
{
strReq.AppendFormat("{0},", style);
}
strReq.Remove(strReq.Length - 1, 1);
}
return(strReq.ToString());
}
/// <summary>
/// Renders the layer
/// </summary>
/// <param name="g">Graphics object reference</param>
/// <param name="map">Map which is rendered</param>
public override void Render(System.Drawing.Graphics g, Map map)
{
SharpMap.Web.Wms.Client.WmsOnlineResource resource = GetPreferredMethod();
Uri myUri = new Uri(GetRequestUrl(map.Envelope, map.Size));
System.Net.WebRequest myWebRequest = System.Net.WebRequest.Create(myUri);
myWebRequest.Method = resource.Type;
myWebRequest.Timeout = _TimeOut;
if (_Credentials != null)
{
myWebRequest.Credentials = _Credentials;
}
else
{
myWebRequest.Credentials = System.Net.CredentialCache.DefaultCredentials;
}
if (_Proxy != null)
{
myWebRequest.Proxy = _Proxy;
}
try
{
System.Net.HttpWebResponse myWebResponse = (System.Net.HttpWebResponse)myWebRequest.GetResponse();
System.IO.Stream dataStream = myWebResponse.GetResponseStream();
if (myWebResponse.ContentType.StartsWith("image"))
{
System.Drawing.Image img = System.Drawing.Image.FromStream(myWebResponse.GetResponseStream());
if (_ImageAttributes != null)
{
g.DrawImage(img, new Rectangle(0, 0, img.Width, img.Height), 0, 0,
img.Width, img.Height, GraphicsUnit.Pixel, this.ImageAttributes);
}
else
{
g.DrawImageUnscaled(img, 0, 0, map.Size.Width, map.Size.Height);
}
}
dataStream.Close();
myWebResponse.Close();
}
catch (System.Net.WebException webEx)
{
if (!_ContinueOnError)
{
throw (new SharpMap.Rendering.Exceptions.RenderException("There was a problem connecting to the WMS server when rendering layer '" + this.LayerName + "'", webEx));
}
else
{
//Write out a trace warning instead of throwing an error to help debugging WMS problems
System.Diagnostics.Trace.Write("There was a problem connecting to the WMS server when rendering layer '" + this.LayerName + "': " + webEx.Message);
}
}
catch (System.Exception ex)
{
if (!_ContinueOnError)
{
throw (new SharpMap.Rendering.Exceptions.RenderException("There was a problem rendering layer '" + this.LayerName + "'", ex));
}
else
{
//Write out a trace warning instead of throwing an error to help debugging WMS problems
System.Diagnostics.Trace.Write("There was a problem connecting to the WMS server when rendering layer '" + this.LayerName + "': " + ex.Message);
}
}
base.Render(g, map);
}
private Bitmap WmsGetMap(BoundingBox extent, TileSet tileSet)
{
Stream responseStream = null;
System.Drawing.Bitmap bitmap = null;
SharpMap.Web.Wms.Client.WmsOnlineResource resource = GetPreferredMethod();
string requestUrl = GetRequestUrl(extent, tileSet);
Uri myUri = new Uri(requestUrl);
System.Net.WebRequest webRequest = System.Net.WebRequest.Create(myUri);
webRequest.Method = resource.Type;
webRequest.Timeout = this.TimeOut;
if (this.Credentials != null)
{
webRequest.Credentials = this.Credentials;
}
else
{
webRequest.Credentials = System.Net.CredentialCache.DefaultCredentials;
}
if (this.Proxy != null)
{
webRequest.Proxy = this.Proxy;
}
System.Net.HttpWebResponse webResponse = null;
try
{
webResponse = (System.Net.HttpWebResponse)webRequest.GetResponse();
if (webResponse.ContentType.StartsWith("image"))
{
responseStream = webResponse.GetResponseStream();
bitmap = (Bitmap)System.Drawing.Bitmap.FromStream(responseStream);
return((Bitmap)bitmap);
}
else
{
//if the result was not an image retrieve content anyway for debugging.
responseStream = webResponse.GetResponseStream();
StreamReader readStream = new StreamReader(responseStream, Encoding.UTF8);
StringWriter stringWriter = new StringWriter();
stringWriter.Write(readStream.ReadToEnd());
string message = "Failed to retrieve image from the WMS in layer '" + this.LayerName + "'. Was expecting image but received this: " + stringWriter.ToString();
HandleGetMapException(message, null);;
return(null);
}
}
catch (System.Net.WebException webEx)
{
string message = "There was a problem connecting to the WMS server when rendering layer '" + this.LayerName + "'";
HandleGetMapException(message, webEx);
}
catch (System.Exception ex)
{
string message = "There was a problem while retrieving the image from the WMS in layer '" + this.LayerName + "'";
HandleGetMapException(message, ex);
}
finally
{
if (webResponse != null)
{
webResponse.Close();
}
if (responseStream != null)
{
responseStream.Close();
responseStream.Dispose();
}
}
return(bitmap);
}
