A little help

[Ricardo M-2]

Have a nice day
I've tried to writte a program with the treeview
class, but for some reason i don't understand, the
program abort in runtime, here's my code:

std::vector<GType> types;
for (int i=0; i<nCols; i++) {
  types.push_back(G_TYPE_STRING);
}

Gtk::ListStore *model = new
Gtk::ListStore(nCols,types);
...

But when i compile the result is:

ClassGrid.cc: In constructor
`classGrid::classGrid(Xfc::String)':
ClassGrid.cc:49: warning: cannot pass objects of
non-POD type `class
   std::vector<GType, std::allocator<GType> >' through
`...'; call will abort
   at runtime


Any idea?
Thanks in advance


       
       
               
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[Benedikt Meurer-2]

Ricardo M wrote:

> Have a nice day
> I've tried to writte a program with the treeview
> class, but for some reason i don't understand, the
> program abort in runtime, here's my code:
>
> std::vector<GType> types;
> for (int i=0; i<nCols; i++) {
>   types.push_back(G_TYPE_STRING);
> }
>
> Gtk::ListStore *model = new
> Gtk::ListStore(nCols,types);
> ...
>
> But when i compile the result is:
>
> ClassGrid.cc: In constructor
> `classGrid::classGrid(Xfc::String)':
> ClassGrid.cc:49: warning: cannot pass objects of
> non-POD type `class
>    std::vector<GType, std::allocator<GType> >' through
> `...'; call will abort
>    at runtime

The constructor is

 ListStore (int n_columns, const GType *types)

so you cannot pass an STL vector for the second argument, instead use:

enum
{
  COLUMN_1,
  COLUMN_2,
  N_COLUMNS,
};

//...

const GType types[N_COLUMNS] = {
  G_TYPE_STRING,
  G_TYPE_STRING
};

Gtk::ListStore *model = new Gtk::ListStore(N_COLUMNS, types);

where COLUMN_1, COLUMN_2, etc. is just an example. The tutorial is a bit
outdated here unfortunately.

> Any idea?
> Thanks in advance

HTH,
Benedikt
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[Ricardo M-2]

Thank you Benedikt

I've made it, and works!

But what i'm trying to make is a dinamically treeview
to show the content of a different tables, that's why
i wanted to use the tutorial approach.

Thanks!

 --- Benedikt Meurer
<benedikt.meurer@...> escribió:

> Ricardo M wrote:
> > Have a nice day
> > I've tried to writte a program with the treeview
> > class, but for some reason i don't understand, the
> > program abort in runtime, here's my code:
> >
> > std::vector<GType> types;
> > for (int i=0; i<nCols; i++) {
> >   types.push_back(G_TYPE_STRING);
> > }
> >
> > Gtk::ListStore *model = new
> > Gtk::ListStore(nCols,types);
> > ...
> >
> > But when i compile the result is:
> >
> > ClassGrid.cc: In constructor
> > `classGrid::classGrid(Xfc::String)':
> > ClassGrid.cc:49: warning: cannot pass objects of
> > non-POD type `class
> >    std::vector<GType, std::allocator<GType> >'
> through
> > `...'; call will abort
> >    at runtime
>
> The constructor is
>
>  ListStore (int n_columns, const GType *types)
>
> so you cannot pass an STL vector for the second
> argument, instead use:
>
> enum
> {
>   COLUMN_1,
>   COLUMN_2,
>   N_COLUMNS,
> };
>
> //...
>
> const GType types[N_COLUMNS] = {
>   G_TYPE_STRING,
>   G_TYPE_STRING
> };
>
> Gtk::ListStore *model = new
> Gtk::ListStore(N_COLUMNS, types);
>
> where COLUMN_1, COLUMN_2, etc. is just an example.
> The tutorial is a bit
> outdated here unfortunately.
>
> > Any idea?
> > Thanks in advance
>
> HTH,
> Benedikt
> _______________________________________________
> Xfc-dev mailing list
> Xfc-dev@...
> http://foo-projects.org/mailman/listinfo/xfc-dev
>

       
       
               
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[Benedikt Meurer-2]

Ricardo M wrote:
> Thank you Benedikt
>
> I've made it, and works!
>
> But what i'm trying to make is a dinamically treeview
> to show the content of a different tables, that's why
> i wanted to use the tutorial approach.

You'll need different Gtk::ListStores for each table then (and a
different Gtk::TreeViewColumns setup). To dynamically allocate the
columns, just use:

Gtk::ListStore* create_store (int n_columns)
{
  GType types[n_columns];

  for (int n = 0; n < n_columns; ++n)
    types[n] = G_TYPE_STRING;

  return new Gtk::ListStore (n_columns, types);
}

> Thanks!

Benedikt
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[Ricardo M-2]

Hi Benedikt
Thank you very much for your support

I've tried your approach, but i have a "Segmentation
Fault" on runtime. I've changed your suggest, making a
new ListStore class, with a constructor with your code
of course, but after compile, the first time to run,
works fine, but just another run and crash it again!
I can't see my mistake
Can you help me?
Thanks in advance

 --- Benedikt Meurer
<benedikt.meurer@...> escribió:

> Ricardo M wrote:
> > Thank you Benedikt
> >
> > I've made it, and works!
> >
> > But what i'm trying to make is a dinamically
> treeview
> > to show the content of a different tables, that's
> why
> > i wanted to use the tutorial approach.
>
> You'll need different Gtk::ListStores for each table
> then (and a
> different Gtk::TreeViewColumns setup). To
> dynamically allocate the
> columns, just use:
>
> Gtk::ListStore* create_store (int n_columns)
> {
>   GType types[n_columns];
>
>   for (int n = 0; n < n_columns; ++n)
>     types[n] = G_TYPE_STRING;
>
>   return new Gtk::ListStore (n_columns, types);
> }
>
> > Thanks!
>
> Benedikt
> _______________________________________________
> Xfc-dev mailing list
> Xfc-dev@...
> http://foo-projects.org/mailman/listinfo/xfc-dev
>

       
       
               
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[Benedikt Meurer-2]

Ricardo M wrote:

> Hi Benedikt
> Thank you very much for your support
>
> I've tried your approach, but i have a "Segmentation
> Fault" on runtime. I've changed your suggest, making a
> new ListStore class, with a constructor with your code
> of course, but after compile, the first time to run,
> works fine, but just another run and crash it again!
> I can't see my mistake
> Can you help me?
> Thanks in advance

Post the relevant code here, /dev/crystalball is currently broken. ;-)

Benedikt
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[Ricardo M-2]

Thank you!
Here's my ListSt.hh code, the header of my new
ListStore class:

#include <xfc/gtk/liststore.hh>

using namespace Xfc;

class listStor : public Gtk::ListStore
{
  int nColumnas;

public:
  listStor (int nCols);
  virtual ~listStor();
};



And the body of the class in file ListStore.cc:

#include <xfc/gtk/liststore.hh>
#include "ListSt.hh"

listStor::listStor (int nCol)
{
  nColumnas = nCol;
  GType types[nCol];

  for (int n=0; n<nCol; ++n)
    types[n] = G_TYPE_STRING;
  set_column_types (nCol, types);
}

listStor::~listStor()
{
}

When i call my class from within another class,
derived from a TreeView is:


  unsigned long nReng, nCols;
  unsigned long i, j;
  String strSQL, strTitulo;
  int nCol;

  set_border_width(2);
  set_policy(Gtk::POLICY_AUTOMATIC,
Gtk::POLICY_AUTOMATIC);
  show();

  connection C("dbname=test user=postgres");
  transaction<> T(C, "trx");
  strSQL = "SELECT vista FROM vistas WHERE tabla='";
  strSQL.append (tabla);
  strSQL.append ("';");
  result R1(T.exec(strSQL.str()));
  nReng = R1.size ();
  if (nReng == 0ul) {
    strSQL = "SELECT * FROM ";
    strSQL.append (tabla);
  } else {
    result::const_iterator c=R1.begin();
    strSQL = "SELECT * FROM ";
    strSQL.append (c["vista"].as(string()));
  }

  result R(T.exec(strSQL.str()));
  nReng = R.size ();
  nCols = R.columns();
  nCol  = R.columns();

  model = new listStor(nCol);

the last line is apparently wher it falls

Thank you

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[Benedikt Meurer-2]

Ricardo M wrote:

> Thank you!
> Here's my ListSt.hh code, the header of my new
> ListStore class:
>
> #include <xfc/gtk/liststore.hh>
>
> using namespace Xfc;
>
> class listStor : public Gtk::ListStore
> {
>   int nColumnas;
>
> public:
>   listStor (int nCols);
>   virtual ~listStor();
> };
>
>
>
> And the body of the class in file ListStore.cc:
>
> #include <xfc/gtk/liststore.hh>
> #include "ListSt.hh"
>
> listStor::listStor (int nCol)
> {
>   nColumnas = nCol;
>   GType types[nCol];
>
>   for (int n=0; n<nCol; ++n)
>     types[n] = G_TYPE_STRING;
>   set_column_types (nCol, types);
> }

Uhm, looks correct. Try allocating the types on the heap instead:

GType *types = new GType[nCol];
for (int n = 0; n < nCol; ++n)
  types[n] = G_TYPE_STRING;
set_column_types (nCol, types);
delete[] types;

If that doesn't work, send a backtrace of the crash.

> Thank you

Benedikt
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[Ricardo M-2]

The backtrace is a print of the screen?
Here it is:

bash-3.00# ./catalogos
Segmentation fault
bash-3.00# LOG:  unexpected EOF on client connection

The last line is coming from the DB

 --- Benedikt Meurer
<benedikt.meurer@...> escribió:

> Ricardo M wrote:
> > Thank you!
> > Here's my ListSt.hh code, the header of my new
> > ListStore class:
> >
> > #include <xfc/gtk/liststore.hh>
> >
> > using namespace Xfc;
> >
> > class listStor : public Gtk::ListStore
> > {
> >   int nColumnas;
> >
> > public:
> >   listStor (int nCols);
> >   virtual ~listStor();
> > };
> >
> >
> >
> > And the body of the class in file ListStore.cc:
> >
> > #include <xfc/gtk/liststore.hh>
> > #include "ListSt.hh"
> >
> > listStor::listStor (int nCol)
> > {
> >   nColumnas = nCol;
> >   GType types[nCol];
> >
> >   for (int n=0; n<nCol; ++n)
> >     types[n] = G_TYPE_STRING;
> >   set_column_types (nCol, types);
> > }
>
> Uhm, looks correct. Try allocating the types on the
> heap instead:
>
> GType *types = new GType[nCol];
> for (int n = 0; n < nCol; ++n)
>   types[n] = G_TYPE_STRING;
> set_column_types (nCol, types);
> delete[] types;
>
> If that doesn't work, send a backtrace of the crash.
>
> > Thank you
>
> Benedikt
> _______________________________________________
> Xfc-dev mailing list
> Xfc-dev@...
> http://foo-projects.org/mailman/listinfo/xfc-dev
>

       
       
               
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[Ricardo M-2]

Here's the output in compile time with the delete[]
sentence:

ListSt.cc: In constructor `listStor::listStor(int)':
ListSt.cc:12: warning: deleting array `GType
types[((nCol - 1) + 1)]'

 --- Ricardo M <tareasrick@...> escribió:

> The backtrace is a print of the screen?
> Here it is:
>
> bash-3.00# ./catalogos
> Segmentation fault
> bash-3.00# LOG:  unexpected EOF on client connection
>
> The last line is coming from the DB
>
>  --- Benedikt Meurer
> <benedikt.meurer@...> escribió:
>
> > Ricardo M wrote:
> > > Thank you!
> > > Here's my ListSt.hh code, the header of my new
> > > ListStore class:
> > >
> > > #include <xfc/gtk/liststore.hh>
> > >
> > > using namespace Xfc;
> > >
> > > class listStor : public Gtk::ListStore
> > > {
> > >   int nColumnas;
> > >
> > > public:
> > >   listStor (int nCols);
> > >   virtual ~listStor();
> > > };
> > >
> > >
> > >
> > > And the body of the class in file ListStore.cc:
> > >
> > > #include <xfc/gtk/liststore.hh>
> > > #include "ListSt.hh"
> > >
> > > listStor::listStor (int nCol)
> > > {
> > >   nColumnas = nCol;
> > >   GType types[nCol];
> > >
> > >   for (int n=0; n<nCol; ++n)
> > >     types[n] = G_TYPE_STRING;
> > >   set_column_types (nCol, types);
> > > }
> >
> > Uhm, looks correct. Try allocating the types on
> the
> > heap instead:
> >
> > GType *types = new GType[nCol];
> > for (int n = 0; n < nCol; ++n)
> >   types[n] = G_TYPE_STRING;
> > set_column_types (nCol, types);
> > delete[] types;
> >
> > If that doesn't work, send a backtrace of the
> crash.
> >
> > > Thank you
> >
> > Benedikt
> > _______________________________________________
> > Xfc-dev mailing list
> > Xfc-dev@...
> > http://foo-projects.org/mailman/listinfo/xfc-dev
> >
>
>
>
>
>
>
>

___________________________________________________________

>
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>
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[Benedikt Meurer-2]

Ricardo M wrote:
> The backtrace is a print of the screen?
> Here it is:
>
> bash-3.00# ./catalogos
> Segmentation fault
> bash-3.00# LOG:  unexpected EOF on client connection

Ehm, no, a backtrace from the debugger. Compile your code with -O0 -g3
(as compiler flags), then run the debugger with your application:

$ gdb ./catalogos
[gdb messages....]
(gdb) run
[lalala...]
Crashes
(gdb) backtrace
[the backtrace of the crash] <- post this

HTH,
Benedikt
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[Benedikt Meurer-2]

Ricardo M wrote:
> Here's the output in compile time with the delete[]
> sentence:
>
> ListSt.cc: In constructor `listStor::listStor(int)':
> ListSt.cc:12: warning: deleting array `GType
> types[((nCol - 1) + 1)]'

Ehm, sorry, no idea what the compiler is trying to tell you here. Btw.
which compiler do you use?

Benedikt
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[Ricardo M-2]

bash-3.00# g++ --version
g++ (GCC) 3.3.6
Copyright (C) 2003 Free Software Foundation, Inc.
This is free software; see the source for copying
conditions.  There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR
A PARTICULAR PURPOSE.


 --- Benedikt Meurer
<benedikt.meurer@...> escribió:

> Ricardo M wrote:
> > Here's the output in compile time with the
> delete[]
> > sentence:
> >
> > ListSt.cc: In constructor
> `listStor::listStor(int)':
> > ListSt.cc:12: warning: deleting array `GType
> > types[((nCol - 1) + 1)]'
>
> Ehm, sorry, no idea what the compiler is trying to
> tell you here. Btw.
> which compiler do you use?
>
> Benedikt
> _______________________________________________
> Xfc-dev mailing list
> Xfc-dev@...
> http://foo-projects.org/mailman/listinfo/xfc-dev
>

       
       
               
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[Ricardo M-2]

Here's the backtrace:

Program received signal SIGSEGV, Segmentation fault.
[Switching to Thread 16384 (LWP 1697)]
0x0805e0b5 in ntb_Trabajo::addGrid (this=0x8124a90,
str=
      {string_ = {static npos = 4294967295,
_M_dataplus = {<std::allocator<char>> = {<No data
fields>}, _M_p = 0x8093f0c "generos"}, static
_S_empty_rep_storage = {0, 0, 0, 0}}, is_null = false,
static npos = 4294967295})
    at NoteBook.cc:106
106         grdGen->dispose ();
(gdb)

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[Benedikt Meurer-2]

Ricardo M wrote:

> Here's the backtrace:
>
> Program received signal SIGSEGV, Segmentation fault.
> [Switching to Thread 16384 (LWP 1697)]
> 0x0805e0b5 in ntb_Trabajo::addGrid (this=0x8124a90,
> str=
>       {string_ = {static npos = 4294967295,
> _M_dataplus = {<std::allocator<char>> = {<No data
> fields>}, _M_p = 0x8093f0c "generos"}, static
> _S_empty_rep_storage = {0, 0, 0, 0}}, is_null = false,
> static npos = 4294967295})
>     at NoteBook.cc:106
> 106         grdGen->dispose ();
> (gdb)

Aye, so it's not crashing in the ListStore constructor, but in
ntb_Trabajo::addGrid(). Check that method.

Benedikt
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[Ricardo M-2]

Thank you Benedikt!
Yes, i have a running program now
Thanks and i'm sorry if i'm disturbing
Next time the beers are on my own!

 --- Benedikt Meurer
<benedikt.meurer@...> escribió:

> Ricardo M wrote:
> > Here's the backtrace:
> >
> > Program received signal SIGSEGV, Segmentation
> fault.
> > [Switching to Thread 16384 (LWP 1697)]
> > 0x0805e0b5 in ntb_Trabajo::addGrid
> (this=0x8124a90,
> > str=
> >       {string_ = {static npos = 4294967295,
> > _M_dataplus = {<std::allocator<char>> = {<No data
> > fields>}, _M_p = 0x8093f0c "generos"}, static
> > _S_empty_rep_storage = {0, 0, 0, 0}}, is_null =
> false,
> > static npos = 4294967295})
> >     at NoteBook.cc:106
> > 106         grdGen->dispose ();
> > (gdb)
>
> Aye, so it's not crashing in the ListStore
> constructor, but in
> ntb_Trabajo::addGrid(). Check that method.
>
> Benedikt
> _______________________________________________
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>

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[Benedikt Meurer-2]

Ricardo M wrote:
> Thank you Benedikt!
> Yes, i have a running program now
> Thanks and i'm sorry if i'm disturbing
> Next time the beers are on my own!

You're welcome.

Benedikt
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