[mapguide-users] programmatically add layer to initial map

[Carl]

Following the logic below to create a weblayout and mapdefinition by
modifying the xml and using SetResource to save the updated xml into the
session repository, I am having some problems. 

Initialize web tier
Create a session, and open connection
Use GetResource to retrieve the Xml for the WebLayout AND MapDefinition
Modify the MapDefinition Xml to your liking (add layers etc.)
Save the MapDefinition to the session repository, using SetResource.
Update the WebLayout's map resourceid to point towards your modified 
WebLayout.
Save the WebLayout to the session repositiory, using SetResource
Start the viewer, pointing at the newly created WebLayout.

I am getting an error message 'The map definition is invalid.' when the
viewer loads.

The following code works no problem and the viewer displays the weblayout
and map from the session repository.

//Code above for modifying xml for web layout changing map resource and
persisting to session

MgResourceIdentifier mapResourceID = new
MgResourceIdentifier("Library://Demo/Maps/Demo.MapDefinition");
MgByteReader byteRdr2 = resService.GetResourceContent(mapResourceID);
String sessMapName = mapResourceID.GetName();
MgResourceIdentifier SessMapResId = new MgResourceIdentifier("Session:" +
sessionId + "//" + sessMapName + ".MapDefinition");
resService.SetResource(SessMapResId, byteRdr2, null);

//Loads into viewer no problem

But as soon as I try to load the map definition xml using SetResource I get
the invalid XML error

//Code above for modifying xml for web layout changing map resource and
persisting to session

MgResourceIdentifier mapResourceID = new
MgResourceIdentifier("Library://Demo/Maps/Demo.MapDefinition");
MgByteReader byteRdr2 = resService.GetResourceContent(mapResourceID);
String sessMapName = mapResourceID.GetName();

String mapResStr = byteRdr2.ToString();

//Load the web layout into an xml document
XmlDocument mapDoc = new XmlDocument();
mapDoc.LoadXml(mapResStr);
XmlElement mapRoot = mapDoc.DocumentElement;

MemoryStream xmlStream = new MemoryStream();
mapDoc.Save(xmlStream);
byte[] mapDefinition = xmlStream.ToArray();
Encoding utf8 = Encoding.UTF8;
String mapDefStr = new String(utf8.GetChars(mapDefinition));
mapDefinition = new byte[mapDefStr.Length - 1];
int byteCount = utf8.GetBytes(mapDefStr, 1, mapDefStr.Length - 1,
mapDefinition, 0);
MgByteSource byteSource = new MgByteSource(mapDefinition,
mapDefinition.Length);
byteSource.SetMimeType(MgMimeType.Xml);

//Load the modified map into the session repository
MgResourceIdentifier SessMapResId = new MgResourceIdentifier("Session:" +
sessionId + "//" + sessMapName + ".MapDefinition");
resService.SetResource(SessMapResId, byteSource.GetReader(), null);

//This causes an invalid map error when the viewer loads


Any pointers on why manipulating the map definition is causing problems
would be great. Using the same techniques I am having no problems
manipulating the webDefintion or layerDefinition

Thanks  

Carl Grice
Keynetix Ltd
Tel. +44 (0) 1527 68888
Fax. +44 (0) 1527 62880
Web Site: http://www.keynetix.com

IMPORTANT: Please address all support & sales correspondence
keynetix at key-systems.com.
Addressing support questions to individuals may delay the response.
-----Original Message-----
From: mapguide-users-bounces at lists.osgeo.org
[mailto:mapguide-users-bounces at lists.osgeo.org] On Behalf Of Kenneth,
GEOGRAF A/S
Sent: 13 August 2007 15:16
To: MapGuide Users Mail List
Subject: Re: [mapguide-users] programmatically add layer to initial map

When the viewer loads, it creates a map from the weblayout/mapdefinition 
passed.
Your runtime map gets overwritten when the viewer starts.
Instead you can do this:

Initialize web tier
Create a session, and open connection
Use GetResource to retrieve the Xml for the WebLayout AND MapDefinition
Modify the MapDefinition Xml to your liking (add layers etc.)
Save the MapDefinition to the session repository, using SetResource.
Update the WebLayout's map resourceid to point towards your modified 
WebLayout.
Save the WebLayout to the session repositiory, using SetResource
Start the viewer, pointing at the newly created WebLayout.

You may of course use the "Library://" repository, if you want the 
changes to persist.

Regards, Kenneth, GEOGRAF A/S



Scott, Brian skrev:
> Hi Carl - 
>
> What db are you using?  I found, for example, that I could not filter at
run time against Postgres/PostGIS.  I was able to create a whole new layer
based on points available in PG, but I  had to extact the attributes, create
points, then apply them to a new layer.  Very cumbersome, but for whatever
reason, filtering just wouldn't work w/PostGIS.  
>
> Good luck!
> brian
>
> -----Original Message-----
> From: mapguide-users-bounces at lists.osgeo.org
> [mailto:mapguide-users-bounces at lists.osgeo.org]On Behalf Of Carl Grice
> Sent: Monday, August 13, 2007 10:01 AM
> To: mapguide-users at lists.osgeo.org
> Subject: [mapguide-users] programmatically add layer to initial map
>
>
>
> Hi,
>
> I am trying to programmatically filter and add a layer to a map that
exists
> in the repository before the map is initially loaded in the clients
viewer.
> The steps i am performing are as follows;
>
> 1)Initialize the web teir and open site
> 2)Create a new session and open a site connection
> 3)Use map.create() to create a map from an existing map definition in the
> repository
> 4)Create a session resource identifier and use map.Save() to save the
> existing map into the session repository
> 5)Use map.Open() to open the map resource just created in the session
> repository
> 6)Use map.Getlayers() and insert() to add a new layer into the map
> 7)use map.save() to save the map with the added layer into the session
> repository
>
> When i debug my code i get no errors and the map displays in the viewer
but
> the added layer does not (even after performing a map refresh).
>
> Please can you point me in the direction of a sample that performs a
similar
> task or provide a code example? (I have found similar problems disscussed
> but cannot find a solution)
>
> Thanks in advance.
>   
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