Hi Yongzhao,
Please read the documentation of dialogs.C. In particular, you will
read;
// This file contains the class InputDialog.
// An InputDialog object prompts for an input string using a simple
// dialog box. The InputDialog class is also a good example of how
// to use the ROOT GUI classes via the interpreter. Since interpreted
// classes can not call virtual functions via base class pointers, all
// GUI objects are used by composition instead of by inheritance.
//
// This file contains also some utility functions that use
// the InputDialog class to either get a string, integer or
// floating point number. There are also two functions showing
// how to use the file open and save dialogs. The utility functions are:
//
// const char *OpenFileDialog()
// const char *SaveFileDialog()
// const char *GetStringDialog(const char *prompt, const char *defval)
// Int_t GetIntegerDialog(const char *prompt, Int_t defval)
// Float_t GetFloatDialog(const char *prompt, Float_t defval)
//
// To use the InputDialog class and the utility functions you just
// have to load the dialogs.C file as follows:
// .L dialogs.C
//
// Now you can use them like:
// {
// const char *file = OpenFileDialog();
// Int_t run = GetIntegerDialog("Give run number:", 0);
// Int_t event = GetIntegerDialog("Give event number:", 0);
// printf("analyse run %d, event %d from file %s\n", run ,event,
file);
// }
Rene Brun
Zhou wrote:
>
> Hi, ROOTer's,
> I got a wrong message when I run a program dialogs.C in the directory
> tutorials as:
>
> root [0] .x dialogs.C
> Error: No symbol dialogs() in current scope FILE: LINE:0
> *** Interpreter error recovered ***
>
> I don't know what is wrong.
> Thanks for someone help me.
> Best,
> ZYZ
>
> ------
> Yongzhao Zhou, KLOE, LNF, INFN, Italy
> Tel:39-06-94032696 Fax:39-06-94032427
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