The erlogr from lucidstack

erlogr's Introduction

Install

Build it with:

make

Run tests with:

make check

or

make check-verbose

On Windows

You need to have GDAL installed, let's say it was installed to C:\cygwin\opt\gdal.

Open a shell which has all compilers and the MSVC environment set up (e.g. the Windows SDK 7.1 Command Prompt).

Now set it up so that GDAL and Erlang can be found:

SET INCLUDE=%INCLUDE%;C:\cygwin\opt\gdal\include;C:\cygwin\opt\gdal\include\gdal
SET LIB=%LIB%;C:\cygwin\opt\gdal\lib
SET PATH=%PATH%;C:\cygwin\opt\gdal\bin;C:\erl5.9.1\bin

And finally compile the whole thing:

rebar compile

Examples

Here's an example session in the erlang shell. See the src/erlogr.erl file for more examples.

$ erl -pa ebin
Erlang R14B04 (erts-5.8.4) [source] [64-bit] [smp:4:4] [rq:4] [async-threads:0] [kernel-poll:false]

Eshell V5.8.4  (abort with ^G)

1> Driver = erlogr:get_driver(0),
1> erlogr:dr_get_name(Driver).
"ESRI Shapefile"

2> Driver = erlogr:get_driver_by_name("ESRI Shapefile"),
2> erlogr:dr_get_name(Driver).
"ESRI Shapefile"

3> DataSource = erlogr:open("test/polygon.shp"),
3> Layer = erlogr:ds_get_layer(DataSource, 0),
3> Feature = erlogr:l_get_feature(Layer, 0),
3> Geometry = erlogr:f_get_geometry_ref(Feature),
3> Wkt = erlogr:g_export_to_wkt(Geometry).
"POLYGON ((0.351988636363636 -0.969460227272728,2.058238636363636 0.086505681818182,2.690625 -1.524289772727273,0.0 -2.0015625,-0.304261363636364 -1.828551136363636,0.351988636363636 -0.969460227272728))" 

4> Wkb = erlogr:g_export_to_wkb(Geometry).
<<1,3,0,0,0,1,0,0,0,6,0,0,0,136,181,111,88,251,134,214,63,
  72,23,93,116,209,5,239,191,...>>

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