[mapguide-users] ByteReader Problem

[Kenneth, GEOGRAF A/S]

Very odd.

I have been using this code to read data from the server:

XmlDocument doc = new XmlDocument();
{  
    MgByteReader rd = rs.GetResourceContent(new 
MgResourceIdentifier(webLayout));
    using(System.IO.MemoryStream ms = new System.IO.MemoryStream())
    {
        byte[] buf = new byte[1024];
        int c = 0;
        do
        {
            c = rd.Read(buf, buf.Length);
            ms.Write(buf, 0, c);
        } while (c != 0);
        ms.Position = 0;
        doc.Load(ms);
    }
}

It worked the last time I used it, but that was a while ago (around 1.2 
beta 1, I think).

Regards, Kenneth, GEOGRAF A/S



Campbell, Keith A skrev:
> Kenneth,
>  
> If I run this code, it results in an endless loop because the
>     read = mapByteRdr.Read(buf, buf.length);
> call reads the same data each time - the start point for each read is 
> not advanced.
>  
> Keith
>
> ------------------------------------------------------------------------
> *From:* mapguide-users-bounces at lists.osgeo.org 
> [mailto:mapguide-users-bounces at lists.osgeo.org] *On Behalf Of 
> *Kenneth, GEOGRAF A/S
> *Sent:* 31 August 2007 17:14
> *To:* MapGuide Users Mail List
> *Subject:* Re: [mapguide-users] ByteReader Problem
>
> The only way around it, that I have found, is to copy/paste code like 
> this:
>
> System.IO.MemoryStream ms = new System.IO.MemoryStream();
> byte[] buf = new byte[8*1024];
> int read = 1;
> while(read != 0)
> {
>     read = mapByteRdr.Read(buf, buf.length);
>   ms.Write(buf, 0, read);
> }
>
> //ms now contains the stream
>
> Regards, Kenneth, GEOGRAF A/S
>   
>
>
> Campbell, Keith A skrev:
>> Thanks Dennis.
>>  
>> I've tried this, but I'm only getting 8192 bytes read into the byte 
>> buffer. This seems to be the problem mentioned by Kenneth. The Read 
>> method doesn't seem to allow the start location for the read to be 
>> set, so looping until the entire content of the Resource is read into 
>> the buffer doesn't seem to be an option.
>>  
>> Presumably somebody must have found a way around this.
>>  
>> Keith
>>
>> ------------------------------------------------------------------------
>> *From:* mapguide-users-bounces at lists.osgeo.org 
>> [mailto:mapguide-users-bounces at lists.osgeo.org] *On Behalf Of *Jonio, 
>> Dennis (Aviation)
>> *Sent:* 31 August 2007 14:05
>> *To:* MapGuide Users Mail List
>> *Subject:* RE: [mapguide-users] ByteReader Problem
>>
>> ... this sequence tends to work     
>>
>>  
>>
>>      // For some reason the MgByteReader "disappears"
>>
>>      // This seems to work ....
>>
>>             long long_length = rs.GetResourceContent(resId).GetLength();
>>
>>             byte[] byteBuffer = new byte[long_length];
>>
>>             int numBytes = 
>> rs.GetResourceContent(resId).Read(byteBuffer, (int)long_length);
>>
>>  
>>
>> -----Original Message-----
>> *From:* mapguide-users-bounces at lists.osgeo.org 
>> [mailto:mapguide-users-bounces at lists.osgeo.org] *On Behalf Of 
>> *Campbell, Keith A
>> *Sent:* Friday, August 31, 2007 7:10 AM
>> *To:* MapGuide Users Mail List
>> *Subject:* [mapguide-users] ByteReader Problem
>>
>>  
>>
>> I am trying to alter a map definition through the API and cannot get 
>> the contents of the MgByteReader in string format. Here's the code:-
>>
>>             String mapDefinition = "Library://My Folder/Maps/My 
>> Map.MapDefinition";
>>             MgResourceIdentifier MapResID = new 
>> MgResourceIdentifier(mapDefinition);
>>
>>             MgByteReader mapByteRdr = 
>> res.GetResourceContent(MapResID);//res is instantiated Resource Service.
>>
>>             XmlDocument doc = new XmlDocument();
>>            
>>             doc.LoadXml(mapByteRdr.ToString());
>>
>> LoadXML fails with an error ' Root element is missing'. I can copy 
>> the contents of mapByteRdr from Visual Studio at runtime and it 
>> contains properly formatted XML for the map definition. If I use the 
>> ToFile() method, the resultant file is empty. I cannot see why these 
>> two methods do not return the xml string in the reader. Any help is 
>> welcome.
>>
>> Cheers,
>>
>> Keith
>>
>>  
>>
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