Compile ROOT projects with Visual Studio

[Rajat_Mondal]

Hi,
I am using ROOT in Windows with Visual Studio. I built ROOT from source and it went fine. I can use macros with root.exe perfectly. But I need to use ROOT libraries with other things as well as be able to debug codes and I just can’t get ROOT parts to compile in Visual Studio. For example, this basic code:

#include <TApplication.h>
#include <TF1.h>
#include <TRandom3.h>
int main(int argc, char** argv)
{
	TApplication theApp("App", &argc, argv);
	TF1* f1 = new TF1("f1", "sin(x)/x" , 0, 10);
	theApp.Run();
	return 0;
}

gives a compiler error:
‘__find_end’: is not a member of 'std` in file RWrap_libcpp_string_view.h in line 428.

What I tried:

1. Added environment vars ROOTSYS and %ROOTSYS%\bin in Paths
2. Solution properties–>Configuration properties–> Added the include and library dirs
3. Solution properties–>Linker–>Input–> Added all the .lib files

it still shows the same error while compilation.

@bellenot can you help?

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ROOT Version: 6.21
Platform: Windows
Compiler: cl

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[bellenot]

It is most probably due to incompatible compiler flags.Could you simply try, in a x86 Native Tools Command Prompt for VS 2019:

cl -nologo -O2 -MD -GR -EHsc -I%ROOTSYS%\include test.cpp /link -LIBPATH:%ROOTSYS%\lib libCore.lib libGpad.lib libHist.lib /out:test.exe

(replace test.cpp with your file name)

[Rajat_Mondal]

Thanks. It at least compiles. But the program execution stalls and nothing happens.

It seems to be a problem with TApplication. Because without that, the program quits normally. I will use mainly use TMVA from ROOT so can you please tell me what should be a typical command/what other libs I should include?

[bellenot]

@Rajat_Mondal

But the program execution stalls and nothing happens.

What did you expect? You don’t do anything in your code…

@Rajat_Mondal

It seems to be a problem with TApplication. Because without that, the program quits normally.

TApplication is required to handle/process events. It you want to exit, simply call gApplication->Terminate(0);
And to use TMVA, you have to link against libTMVA.lib

[Rajat_Mondal]

Sorry I forgot about the Draw() command. It works perfectly now. Thanks a lot.