int    Sys(const char *cmd, String& output);
String Sys(const char *cmd);

#include <CtrlLib/CtrlLib.h>
using namespace Upp;

class App:public TopWindow {
	typedef App CLASSNAME;
	Array<LocalProcess> p;
	Button b;
public:
	App(){
		Add(b.HCenterPos().VCenterPos());
		b.SetLabel("Push me!");
		b<<=THISBACK(Launch);
	}
	void Launch(){
		// we add a new process to the array and start a command
		p.Add().Start("calc.exe");
	}
	~App(){
		// if you wish the processes run after closing the app, detach them like this:
		for(int i=0;i<p.GetCount();i++){
			p[i].Detach();
		}
	}
};

GUI_APP_MAIN{
	App().Sizeable().Run();
}

int SysConsole::System(const char *cmd)
{
	if(!IsOpen())
		Open();
	list.Add(AttrText(cmd).SetFont(font().Bold()).Ink(LtBlue));
	int ii = list.GetCount();
	LocalProcess p;
	if(!p.Start(cmd))
		return -1;
	String out;
	while(p.IsRunning()) {
		String h = p.Get();
		out.Cat(h);
		int lf = out.ReverseFind('\n');
		if(lf >= 0) {
			AddResult(out.Mid(0, lf + 1));
			out = out.Mid(lf + 1);
		}
		ProcessEvents();
		Sleep(h.GetCount() == 0); // p.Wait would be much better here!
	}
	out.Cat(p.Get());
	AddResult(out);
	ProcessEvents();
	int code = p.GetExitCode();
	if(code)
		while(ii < list.GetCount()) {
			list.Set(ii, 0, AttrText((String)list.Get(ii, 1)).SetFont(font).Ink(LtRed));
			ii++;
		}
	return code;
}