Hi,
Are you running with the standard ROOT executable module or did you link
your own application ?
If you run with interpreted code and put everything in one single file,
you can use your global pointers at the top of the file.
I recommend the procedure indicated in my last mail that will also work
with compiled code.
Rene Brun
On Tue, 4 Dec 2001, Harufumi Tsuchiya wrote:
> Thank you so much for your quick reply.
>
> Using your attached programs in previous mail,
> I modified one of the programs (pym.C) like bottom of
> this mail (mod_pym.C) for compiling via g++.
> I certainly could do what I want to do. But, I got new error
> message.
>
> Error in <TApplication::TApplication>: only one instance of TApplication allowed
>
> What is the meaning ?
>
> And also I have one more question.
> In fact, ProjectionXY is defiend in my origianl main program and
> h , other histograms(h1_px, h1_py) and pad are
> also defined in the top of the main program like below.
> This procedure is wrong ?
> In such a case that I want to do, Must I separate ProjectionXY in atnoter
> file in order to use gROOT->ProcessLine() ?
>
> TH2F *h;
> TH1F *h1_px, *h1_py;
> TPad *pad[4];
> int main ( int argc, char** argv ) {
> :
> :
> }
>
> void ProjectionXY() {
> :
> :
> }
>
> Thank you,
>
> Harufumi Tsuchiya
>
> -------------------------
> mod_pym.C
> -------------------------
> #include <TROOT.h>
> #include <TH1.h>
> #include <TH2.h>
> #include <TExec.h>
> #include <TCanvas.h>
> #include <TFile.h>
> #include <TApplication.h>
>
> TH2F *h;
> TH1D *h1_px, *h1_py;
>
> int main (int argc, char** argv) {
>
> gROOT->ProcessLine(".L py.C");
>
> TApplication *app = new TApplication("app", &argc, argv);
>
> TExec *ex_proj = new TExec("ex_proj", "ProjectionXY()");
> TFile f("hsimple.root");
> h = (TH2F*)gDirectory->Get("hpxpy");
> h->GetListOfFunctions()->Add(ex_proj);
> h1_px = 0; h1_py = 0;
> TCanvas c1("c1");
> c1.Divide(2,2);
> c1.cd(1);
> h->Draw("colz");
>
> app->Run();
> }
>
>
>
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