[mapguide-users] MaestroAPI 4 and MGOS 2.2 - empty/blank/transparent map

[Hans Milling]

Hi, I am trying one of the samples from the MapGuide API 4.0 website.

Using MGOS 2.2 I have set up a simple map with a sigel layer based on a
MapInfo tab/ind/map/dat files.

Using MapGuide Maestro 3.5 (And 4.0 RC1) I can see the layer and map, no
problems and no validation errors.

But when I run the following sample code that just saves the map as a PNG
image, the image is just a transparent blank image but with the correct
with/height. Does anyone have any clue what I am missing?



                                Uri host = new
Uri("http://msvm/mapguide/mapagent/mapagent.fcgi");

                                IServerConnection conn =
ConnectionProviderRegistry.CreateConnection("Maestro.Http",
"Url", host.ToString(), "Username",
"Administrator", "Password", "admin");

                                IMappingService mapSvc =
(IMappingService)conn.GetService((int)ServiceType.Mapping);

                                ResourceIdentifier resId = 
new
ResourceIdentifier("Library://Test/MyMap.MapDefinition");

                                IMapDefinition mdf =
(IMapDefinition)conn.ResourceService.GetResource(resId);

                                double metersPerUnit = 1.0;

                        /*      if 
(!string.IsNullOrEmpty(mdf.CoordinateSystem))

                                {

                                  
MgCoordinateSystemFactory factory =
new MgCoordinateSystemFactory(); // <-- This Throws a target of an
invocation exception, but never mind

                                  MgCoordinateSystem 
cs =
factory.Create(mdf.CoordinateSystem);

                                  metersPerUnit =
cs.ConvertCoordinateSystemUnitsToMeters(1.0);

                                }*/

                                ResourceIdentifier rtMapId 
= new
ResourceIdentifier(resId.Name, ResourceTypes.RuntimeMap,
conn.SessionID); 

                                RuntimeMap map = 
mapSvc.CreateMap(rtMapId,
mdf, metersPerUnit); 

                                map.DisplayWidth = 640;

                                map.DisplayHeight = 480;

                                map.DisplayDpi = 96;

                                map.BackgroundColor = 
Color.White;

                                map.DataExtent =
ObjectFactory.CreateEnvelope(505468, 6276258, 539925, 6320454);

                                map.Save();

                                

                                byte[] buf = new byte[1024];

                                using (Stream stream =
mapSvc.RenderDynamicOverlay(map, null, "PNG"))

                                {

                                  using (var fs = new
FileStream("RenderMap.png", FileMode.OpenOrCreate))

                                  {

                                    int read = 0;

                                    do

                                    {

                                      read = 
stream.Read(buf,
0, buf.Length);

                                      
fs.Write(buf, 0, read);

                                    } while (read 
> 0);

                                  }

                                }


Regards Hans Milling...

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