Hi Maarten, you seem to have something not completely correct in you TApplication ctor. Could you show me the code where you create TApplication. I've guessed what went wrong more or less and added an extra protection to prevent the problem from happening in the future. ROOT does not take over anything unless you ask it to do so. It will take over when you call TApplication::Run() which will cause ROOT to enter the X11 or Win32 eventloop. At this stage you will be able to interact with the objects on the screen (in case you display something in a canvas). However, at this level the interpreter is not used. To activate the interpreter you will have to call TRint::Run() (TRint inherits from TApplication). The TRint::Run() will enter the graphics and commandline eventloop and one can type commands on the console. These commands will be interpreted by the interpreter. So to summarize, if you want to use only a few graphics primitives to draw in a canvas you can do so without giving your whole program over to ROOT (see the example program posted yesterday). However, by doing so you will miss out on quite a number of nice features of the framework (e.g. object I/O, fast prototyping via dynamic loading of private classes and access to your classes via the interpreter, etc.). Cheers, Fons. Maarten Bruinsma wrote: > > Dear fellow root users, > > I have just written my first stand-alone program using Root's libraries > and came up with the following errors, that reminded me of errors I got > when I first used Root as such. I did not have a clue then and nor do I > have one now. Maybe someone has an idea of what goes wrong? > Here is the output: > > *** Break *** segmentation violation > > ( 0) 0x81342330 StackTrace__11TUnixSystemFv + 0x30 [/ > ( 1) 0x81340ccc DispatchSignals__11TUnixSystemF8ESignals + 0x12c > [/user/s37/root/lib/libUnix.sl] > 2) 0x8133f894 SigHandler__F8ESignals + 0x2c > ( 3) 0x81343da0 sighandler__Fi + 0x5c > [/user/s37/root/lib/libUnix.sl]l] > ( 3) 0x81343da0 sighandler__Fi + 0x5c [/user/s37/root/lib/libUnix.sl] > ( 4) 0x800aefc0 sigreturn [/lib/libc.sl] > ( 5) 0x800c40fc strlen + 0xc [/lib/libc.sl] > ( 6) 0x8133fe1c SetProgname__11TUnixSystemFPCc + 0x28 > [/user/s37/root/lib/libUnix.sl] > ( 7) 0x813ce674 ct__12TApplicationFPCcPiPPcPvi + 0x1d0 > [/user/s37/root/lib/libRint.s > [/user/s37/root/lib/libRint.sl] > ( 8) 0x00008dcc Plot_On_Screen__5TrackFPA16_8CellInfo + 0x50 > ( 8) 0x00008dcc Plot_On_Screen__5TrackFPA16_8CellInfo + 0x50 > [./anacos][./anacos] > ( 9) 0x0000692c main + 0x140 [./anacos] > (10) 0x80042154 start + 0x70 [/lib/libc.sl] > (11) 0x00005f14 $START$ + 0x9c [./anacos] > > IOT trap (core dumped) > > BTW. is it true that ROOT takes over the whole program and interprets > every command in stead of just giving access to graphical routines? > > Best regards, > > Maarten > > ************************************************************************* > * Maarten Bruinsma * > * ----------------------- * > * Werk: Prive: * > * NIKHEF/ HERA B Ruysdaelkade 189 HS * > * Kruislaan 409 1072 AV AMSTERDAM * > * Postbus 41882 tel. (020) 6758856 * > * 1009 DB AMSTERDAM * > * tel. (020) 5922116 email: t26@nikhef.nl * > * fax. (020) 5995155 http://www.nikhef.nl/user/t26/ * > ************************************************************************* -- Org: CERN, European Laboratory for Particle Physics. Mail: 1211 Geneve 23, Switzerland Phone: +41 22 7679248 E-Mail: Fons.Rademakers@cern.ch Fax: +41 22 7822601
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