Include ROOT in cpp code

[booghimen]

Dears rooters,
Usually i create a macro and I run it in root. But now I have a more complex cpp code, composed by a header and class files, so I would like to include root in this program. How can I do it? I have seen on the web many examples with different methos to compile, but were not very clear… so can someone explain me step by step how can I do it please?

thanks a lot

[amadio]

Here is a simple program root-ls.cc and a Makefile for it. I hope this is enough for you to modify for your purposes.

#include <iostream>

#include "TFile.h"
#include "TKey.h"

void indent(int depth)
{
    for (int i = 0; i < depth; ++i)
        printf(" ");
}

void list(TKey*, int);
void list(TObject*, int);
void list(TDirectory*, int);

void list(TKey *key, int depth)
{
    indent(depth);
    printf("TKey: %s:%s;%d\n", key->GetClassName(), key->GetName(), (int)key->GetCycle());

    if (TObject* obj = key->ReadObj()) {
       if (strncmp("TDirectory", key->GetClassName(), 10) == 0) {
            if (TDirectory *dir = dynamic_cast<TDirectory*>(obj))
                list(dir, depth+1);
       } else {
          obj->Print();
       }
    }
}

void list(TObject *obj, int depth)
{
    indent(depth);
    printf("%s: %s\n", obj->ClassName(), obj->GetName());

    if (TDirectory *dir = dynamic_cast<TDirectory*>(obj))
        list(dir, depth+1);
}

void list(TDirectory *dir, int depth)
{
    for (TObject* obj : *(dir->GetList()))
        list(obj, depth+1);

    for (TObject* obj : *(dir->GetListOfKeys()))
        if (TKey *key = dynamic_cast<TKey*>(obj))
            list(key, depth+1);
}

int main(int argc, char **argv)
{
    for (int i = 1; i < argc; ++i) {
        TFile f(argv[i], "read");

        if (f.IsZombie()) {
            fprintf(stderr, "%s: error opening file: %s\n", basename(argv[0]), argv[i]);
            continue;
        }

        printf("TFile: %s\n", f.GetName());

        for (TObject* obj : *(f.GetListOfKeys()))
            if (TKey *key = dynamic_cast<TKey*>(obj))
                list(key, 1);

        printf("\n");
    }

    return 0;
}

Makefile

CC=cc
CXX=c++

CXXFLAGS=-Wall -O2 -march=native -std=c++11

ROOTFLAGS=$(shell root-config --cflags)
ROOTLIBS=$(shell root-config --libs)

all: root-ls

debug: all
debug: CXXFLAGS += -DDEBUG -g

root-ls: root-ls.cc
	$(CXX) $(CXXFLAGS) $(ROOTFLAGS) -o $@ $^ $(ROOTLIBS)

clean:
	$(RM) -rf root-ls

[booghimen]

thanks a lot amadio!! this works!!

now my problem is that I have more than 1 cpp file, since I have an header and a class file to compile with the main… how can I do?
sorry for the probably stupid question but I’m a very beginner programmer…

thanks a lot

[Danilo]

Hi,

g++ -o myExe myFile_0.cpp myFile_1.cpp ... myFile_N.cpp -I ./ `root-config --cflags --libs`

Cheers,
D

[booghimen]

thanks a lot, it works!!!