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connecting to a server to retrieve data (optimizing) [message #41806]

Sat, 27 November 2004 20:57

nunoragil
Messages: 3
Registered: November 2004

Junior Member

Hi listers,

I'm fetching some data from the web with the following routine. This
does the trick but it gets very slow, for it reads the data on the
server and writes it localy bit by bit in a loop.
Does anyone knows if it is possible to send the request and simply get
the entire data in one turn?
If not, can I read the data bit by bit and append it inside a variable
instead of first writing it all to the disk in a file and then reading
that same file afterwards?

Regards
Nuno

FUNCTION getCoverage, coverage, xMin, xMax, yMin, yMax, format

getRequest='GET /cgi-bin/wcs?REQUEST=GetCoverage&COVERAGE='+coverage+'&a mp;SERVICE=WCS&'+
$
'map=wcs.map&BBOX='+xMin+','+yMin+','+xMax+','+yMax+'&am p;FORMAT='+format+
$
'&CRS=EPSG:4326&RESX=0.00083333&RESY=0.00083333'

host = 'iceds.ge.ucl.ac.uk'
port = 80
SOCKET, unit, host, port, /GET_LUN

PRINTF, unit, getRequest
WIDGET_CONTROL, /HOURGLASS

OPENW,img, 'c:\temp.tif', /GET_LUN
byte_in = 0B

WHILE EOF(unit) EQ 0 DO BEGIN
READU, unit, byte_in
WRITEU,img,byte_in
ENDWHILE

FREE_LUN, unit, img
CLOSE, /ALL
RETURN, READ_TIFF ('c:\temp.tif', GEOTIFF = imgGeoTags)
END

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[Message index]

		connecting to a server to retrieve data (optimizing) By: nunoragil on Sat, 27 November 2004 20:57
		Re: connecting to a server to retrieve data (optimizing) By: Craig Markwardt on Mon, 29 November 2004 15:16
		Re: connecting to a server to retrieve data (optimizing) By: nunoragil on Mon, 29 November 2004 04:45

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