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Reference Guide
guiWithCINT.C File Reference

Detailed Description

A simple example of entering CINT commands and having the CINT output in a ROOT GUI application window.

An editable combo box is used as a CINT prompt, a text view widget displays the command output.

#include <iostream>
#include <TApplication.h>
#include <TRint.h>
#include <TROOT.h>
#include <TSystem.h>
#include <TGTextEntry.h>
#include <TGTextView.h>
#include <TGClient.h>
#include <TGButton.h>
#include <TGFrame.h>
#include <TGLayout.h>
#include <TGWindow.h>
#include <TGLabel.h>
#include <TString.h>
#include <TGComboBox.h>
#include <Getline.h>
class IDList {
Int_t fID; //create widget Id(s)
IDList() : fID(0) {}
~IDList() {}
Int_t GetUnID(void) { return ++fID; }
class MyApplication : public TGMainFrame {
TGTextButton *fExit;
IDList fIDs;
TGComboBox *fComboCmd; // CINT command combobox
TGTextBuffer *fCommandBuf; // text buffer in use
TGTextEntry *fCommand; // text entry for CINT commands
TGTextView *fTextView; // display CINT output
TString fName; // name of temp created file
MyApplication(const TGWindow *p, UInt_t w, UInt_t h);
virtual ~MyApplication();
void DoExit();
void DoEnteredCommand();
ClassDef(MyApplication, 0)
MyApplication::MyApplication(const TGWindow *p, UInt_t w, UInt_t h)
: TGMainFrame(p, w, h)
Connect("CloseWindow()", "MyApplication", this, "DoExit()");
TGHorizontalFrame *fHL2 = new TGHorizontalFrame(this, 70, 100);
AddFrame(fHL2, new TGLayoutHints(kLHintsNormal, 5, 5, 5, 5));
TGLabel *fInlabel = new TGLabel(fHL2, "CINT Prompt:");
fHL2->AddFrame(fInlabel, new TGLayoutHints(kLHintsCenterY));
TGLabel *fOutlabel = new TGLabel(this, "Output Window:");
fCommandBuf = new TGTextBuffer(256);
fComboCmd = new TGComboBox(fHL2, "", fIDs.GetUnID());
fCommand = fComboCmd->GetTextEntry();
fComboCmd->Resize(450, fCommand->GetDefaultHeight());
fHL2->AddFrame(fComboCmd, new TGLayoutHints(kLHintsCenterY | kLHintsExpandX, 20,0,0,0));
TString hist(Form("%s/.root_hist", gSystem->UnixPathName(gSystem->HomeDirectory())));
FILE *fhist = fopen(hist.Data(), "rt");
if (fhist) {
char histline[256];
while (fgets(histline, 256, fhist)) {
histline[strlen(histline)-1] = 0; // remove trailing "\n"
fComboCmd->InsertEntry(histline, 0, -1);
Pixel_t backpxl;
gClient->GetColorByName("#c0c0c0", backpxl);
fTextView = new TGTextView(this, 500, 94, fIDs.GetUnID(), kFixedWidth | kFixedHeight);
AddFrame(fTextView, new TGLayoutHints(kLHintsExpandX));
TGHorizontalFrame *fHL3 = new TGHorizontalFrame(this, 70, 150, kFixedWidth);
fExit = new TGTextButton(fHL3, "&Exit", fIDs.GetUnID());
fExit->Connect("Clicked()", "MyApplication", this, "DoExit()");
AddFrame(fHL3, new TGLayoutHints(kLHintsCenterX | kLHintsCenterY, 1, 1, 1, 1));
SetWindowName("GUI with CINT Input/Output");
fCommand->Connect("ReturnPressed()", "MyApplication", this, "DoEnteredCommand()");
fName = Form("%soutput.log", gSystem->WorkingDirectory());
// Destructor.
void MyApplication::DoExit()
// Close application window.
void MyApplication::DoEnteredCommand()
// Execute the CINT command after the ENTER key was pressed.
const char *command = fCommand->GetTitle();
TString prompt;
if (strlen(command)) {
// form temporary file path
prompt = ((TRint*)gROOT->GetApplication())->GetPrompt();
FILE *cintout = fopen(fName.Data(), "a+t");
if (cintout) {
fputs(Form("%s%s\n",prompt.Data(), command), cintout);
gSystem->RedirectOutput(fName.Data(), "a");
fComboCmd->InsertEntry(command, 0, fIDs.GetUnID());
Gl_histadd((char *)command);
if (fTextView->ReturnLineCount() > 10)
} else {
printf("No command entered\n");
void guiWithCINT()
new MyApplication(gClient->GetRoot(),600,300);
@ kFixedWidth
Definition: GuiTypes.h:387
@ kFixedHeight
Definition: GuiTypes.h:389
ULong_t Pixel_t
Pixel value.
Definition: GuiTypes.h:40
#define h(i)
Definition: RSha256.hxx:106
int Int_t
Definition: RtypesCore.h:45
unsigned int UInt_t
Definition: RtypesCore.h:46
#define ClassDef(name, id)
Definition: Rtypes.h:325
R__EXTERN TApplication * gApplication
Definition: TApplication.h:166
#define gClient
Definition: TGClient.h:166
@ kDeepCleanup
Definition: TGFrame.h:50
@ kLHintsCenterY
Definition: TGLayout.h:35
@ kLHintsNormal
Definition: TGLayout.h:39
@ kLHintsCenterX
Definition: TGLayout.h:32
@ kLHintsExpandX
Definition: TGLayout.h:37
#define gROOT
Definition: TROOT.h:406
char * Form(const char *fmt,...)
R__EXTERN TSystem * gSystem
Definition: TSystem.h:559
virtual void Terminate(Int_t status=0)
Terminate the application by call TSystem::Exit() unless application has been told to return from Run...
virtual void AddFrame(TGFrame *f, TGLayoutHints *l=0)
Add frame to the composite frame using the specified layout hints.
Definition: TGFrame.cxx:1102
TString fName
Definition: TGWindow.h:38
Definition: TRint.h:31
Basic string class.
Definition: TString.h:136
const char * Data() const
Definition: TString.h:369
virtual Int_t RedirectOutput(const char *name, const char *mode="a", RedirectHandle_t *h=nullptr)
Redirect standard output (stdout, stderr) to the specified file.
Definition: TSystem.cxx:1711
virtual const char * UnixPathName(const char *unixpathname)
Convert from a local pathname to a Unix pathname.
Definition: TSystem.cxx:1061
virtual const char * WorkingDirectory()
Return working directory.
Definition: TSystem.cxx:870
virtual const char * HomeDirectory(const char *userName=nullptr)
Return the user's home directory.
Definition: TSystem.cxx:886
virtual int Unlink(const char *name)
Unlink, i.e.
Definition: TSystem.cxx:1379
Ilka Antcheva 06/07/2007

Definition in file guiWithCINT.C.