Hi Glen, always use access the system via the global gSystem pointer. I'll add some protection so people can not instantiate their own TSystem object. Cheers, Fons. "Glen R. Salo" wrote: > > Fons: > > >From the documentation, it was not clear to me that I should not use > TUnixSystem. I will now use the global pointer gSystem instead. My > example did not need to use TUnixSystem; rather, I used it to demonstrate > the problem I was having using TUnixSystem in my "real" code. Thanks for > you help. > > Glen > > On 02-Jul-2001 Fons Rademakers wrote: > > Hi Glen, > > > > never create a TUnixSystem object yourself (why was your intention)? > > Anyway, the following version of your viewer.cxx works fine: > > > > //================================== > >#include <TApplication.h> > >#include <TTree.h> > >#include <TFile.h> > > > > class TViewer { > > > > private: > > TTree *fTree; > > TFile *fFile; > > > > public: > > TViewer() { > > fFile = new TFile("tree3.root"); > > fTree = (TTree *)fFile->Get("t3"); > > fTree->StartViewer(); > > } > > ~TViewer() {delete fFile;} > > }; > > > > void main(int argc, char **argv) { > > > > TApplication theApp("test",&argc,argv); > > new TViewer(); > > theApp.Run(); > > } > > //================================== > > > > > > Cheers, Fons. > > > > > > > > > > "Glen R. Salo" wrote: > >> > >> I am having strange problems when I use TUnixSystem as illustrated in > >> the > >> attached code. Compile the code (g++ -o viewer viewer.cxx `root-config > >> --cflags` `root-config --libs`), copy tree3.root from tutorials to the > >> same directory, and run viewer. On my computer, if I draw "ntrack" a > >> histogram is drawn correctly. However, if I try to draw any of the > >> other > >> branches ("stat", "sign", ...), the code immediately exits and writes > >> "Alarm clock" to my shell window. If the UnixSystem line is removed or > >> replaced with "TUnixSystem *System = new TUnixSystem();" the program > >> works > >> fine. > >> > >> Thanks for your help, > >> > >> Glen > >> > >> ---------------------------------------------------------------------- > >> ---------- > >> Name: viewer.cxx > >> viewer.cxx Type: unspecified type (application/octet-stream) > >> Encoding: base64 > >> Description: viewer.cxx > > > > -- > > Org: CERN, European Laboratory for Particle Physics. > > Mail: 1211 Geneve 23, Switzerland > > E-Mail: Fons.Rademakers@cern.ch Phone: +41 22 7679248 > > WWW: http://root.cern.ch/~rdm/ Fax: +41 22 7677910 -- Org: CERN, European Laboratory for Particle Physics. Mail: 1211 Geneve 23, Switzerland E-Mail: Fons.Rademakers@cern.ch Phone: +41 22 7679248 WWW: http://root.cern.ch/~rdm/ Fax: +41 22 7677910
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