Logo ROOT  
Reference Guide
No Matches
httpcontrol.C File Reference

Detailed Description

This program demonstrates simple application control via THttpServer Two histogram are filled within endless loop.

Via published commands one can enable/disable histograms filling There are also command to clear histograms content

After macro started, open in browser with url


Histograms will be automatically displayed and monitoring with interval 2000 ms started

#include "TH1.h"
#include "TH2.h"
#include "TRandom3.h"
#include "TSystem.h"
#include "THttpServer.h"
Bool_t bFillHist = kTRUE;
void httpcontrol()
// create histograms
TH1D *hpx = new TH1D("hpx","This is the px distribution",100,-4,4);
TH2D *hpxpy = new TH2D("hpxpy","py vs px",40,-4,4,40,-4,4);
// start http server
THttpServer* serv = new THttpServer("http:8080");
// One could specify location of newer version of JSROOT
// serv->SetJSROOT("https://root.cern.ch/js/latest/");
// serv->SetJSROOT("http://jsroot.gsi.de/latest/");
// register histograms
serv->Register("/", hpx);
serv->Register("/", hpxpy);
// enable monitoring and
// specify items to draw when page is opened
// register simple start/stop commands
serv->RegisterCommand("/Start", "bFillHist=kTRUE;", "button;rootsys/icons/ed_execute.png");
serv->RegisterCommand("/Stop", "bFillHist=kFALSE;", "button;rootsys/icons/ed_interrupt.png");
// one could hide commands and let them appear only as buttons
// register commands, invoking object methods
serv->RegisterCommand("/ResetHPX","/hpx/->Reset()", "button;rootsys/icons/ed_delete.png");
serv->RegisterCommand("/ResetHPXPY","/hpxpy/->Reset()", "button;rootsys/icons/bld_delete.png");
// create debug text element, use MathJax - works only on Firefox
serv->CreateItem("/Debug","debug output");
serv->SetItemField("/Debug", "_kind", "Text");
serv->SetItemField("/Debug", "value","\\(\\displaystyle{x+1\\over y-1}\\)");
serv->SetItemField("/Debug", "mathjax", "true");
// Fill histograms randomly
TRandom3 random;
Float_t px, py;
const Long_t kUPDATE = 1000;
Long_t cnt = 0;
while (kTRUE) {
if (bFillHist) {
} else {
gSystem->Sleep(10); // sleep minimal time
if ((cnt % kUPDATE==0) || !bFillHist) {
// IMPORTANT: one should regularly call ProcessEvents
// to let http server process requests
serv->SetItemField("/Debug", "value", Form("\\(\\displaystyle{x+1\\over y-1}\\) Loop:%ld", cnt/kUPDATE));
if (gSystem->ProcessEvents()) break;
long Long_t
Definition RtypesCore.h:54
bool Bool_t
Definition RtypesCore.h:63
float Float_t
Definition RtypesCore.h:57
const Bool_t kTRUE
Definition RtypesCore.h:91
char * Form(const char *fmt,...)
R__EXTERN TSystem * gSystem
Definition TSystem.h:559
virtual void SetFillColor(Color_t fcolor)
Set the fill area color.
Definition TAttFill.h:37
1-D histogram with a double per channel (see TH1 documentation)}
Definition TH1.h:618
virtual void SetDirectory(TDirectory *dir)
By default when an histogram is created, it is added to the list of histogram objects in the current ...
Definition TH1.cxx:8777
virtual Int_t Fill(Double_t x)
Increment bin with abscissa X by 1.
Definition TH1.cxx:3350
2-D histogram with a double per channel (see TH1 documentation)}
Definition TH2.h:292
Int_t Fill(Double_t)
Invalid Fill method.
Definition TH2.cxx:294
Bool_t RegisterCommand(const char *cmdname, const char *method, const char *icon=nullptr)
Register command which can be executed from web interface.
Bool_t CreateItem(const char *fullname, const char *title)
Bool_t Hide(const char *fullname, Bool_t hide=kTRUE)
hides folder or element from web gui
Bool_t Register(const char *subfolder, TObject *obj)
Register object in subfolder.
Bool_t SetItemField(const char *fullname, const char *name, const char *value)
Random number generator class based on M.
Definition TRandom3.h:27
virtual void Rannor(Float_t &a, Float_t &b)
Return 2 numbers distributed following a gaussian with mean=0 and sigma=1.
Definition TRandom.cxx:500
virtual void Sleep(UInt_t milliSec)
Sleep milliSec milli seconds.
Definition TSystem.cxx:438
virtual Bool_t ProcessEvents()
Process pending events (GUI, timers, sockets).
Definition TSystem.cxx:417
Sergey Linev

Definition in file httpcontrol.C.