README.jsoncpp

JSONCPP is required to build a VRPN server for the Vrpn Android widgets (see  android_widgets directory).

Get the latest JSONCPP (r156 has been used successfully) from 
	http://jsoncpp.svn.sourceforge.net/svnroot/jsoncpp/trunk/jsoncpp

You will also need Scons and Python

To build jsoncpp, see README.txt in the JSONCPP directory, but :
1/ 	Get scons-local (2.0.1 is OK) from http://www.scons.org/download.php 
	instead of the link in the README, then
	extract scons-local into the jsoncpp directory as mentionned in the README
2/  To avoid LNK2005 errors when building VRPN, you will need to edit jsoncpp/Sconstruct
	locate the section relative to your build environment, for instance :
		elif platform == 'msvc90':
	in this instruction block, replace the line :
		env['CXXFLAGS']='xxxxxxx /MT'
	by : 
		env['CXXFLAGS']='xxxxxxx /MD'
3/ To build with Visual Studio, run the Visual Studio command that configures environment variables
	(on VS-2008-32, look for a file named vsvars32.bat), otherwise scons may not  find the compiler
	
Then build, for instance with the command
	c:\Python27\python.exe scons.py platform=msvc90

The values allowed for platform are 
	suncc vacpp mingw msvc6 msvc7 msvc71 msvc80 msvc90 linux-gcc

WARNING:
	the JSONCPP build system builds a Release version. Using this release library with a
	Debug VRPN server crashes.
	
To clean, use the command
	c:\Python271\python.exe scons.py platform=msvc90 -c

Then, run CMAKE for VRPN, define VRPN_USE_JSONNET and JSONCPP_ROOT_DIR.