blemidon's Feed - Programmer's Heaven

Re: Multidimensional arrays

Sun, 29 Aug 2010 08:57:18 -0700

Posted a 'reply on the Beginner C/C++ forum.

The tree result are the same for me.

intarr is a pointer of type int[2], because you have 2 ints in a row. int has a 4 bytes length on my system (fedora 64bit), so one row is 8 bytes.

intarr is the address of the array
intarr + 1 is the base address + one row: the result is base+8
intarr[0] + 1 is the same, intarr[0] = intarr with the same type of int[2], so the result is base+8
intarr[0][0] + 2 is the first _int element_ of the array, not a _row (int[2])_. so the +2 means 2 * sizeof(int) not 2 * sizeof(int[2]), and it's 8 too, the result is the same: base+8

Imre Horvath

Re: import csv and then be able to add year revenue

Sun, 29 Aug 2010 08:34:52 -0700

Posted a 'reply on the Python forum.

You have to split the row:

values = row.split('|')

this create a tuple of the values:

('2009', '1', '22', '56.23')

You can then access the columns by
values[0] etc.
Be aware that this values are strs.
You need to convert them to float if you want to make a sum.

v = float(values[3].strip())

Here v will be 56.23
strip() removes whitespaces, just to be sure.

Hope it helps:
Imre Horvath

Re: Pyhton Basics.

Sun, 29 Aug 2010 08:29:03 -0700

Posted a 'reply on the Python forum.

There are some good books for beginners: e.g Learning Python and Programming Python
I think the best way is to start to write a program, and if you have difficulties, ask the forums.
(I've always write a CD/DVD catalog program in every programming language I have to learn:)

Imre Horvath

Re: What the heck is this?

Sat, 03 Jul 2010 04:34:17 -0700

Posted a 'reply on the C and C++ forum.

This post has been deleted.

Re: How can I use gtkmm with MinGW (g++) without MSYS?

Mon, 31 May 2010 05:02:23 -0700

Posted a 'reply on the C and C++ forum.

I can solve this problem by the following 2 scripts:
1st create a batch file to run your program:
hidden.bat:

base.exe

and a vbsctipt file:
hidden.vbs:

Set WshShell = CreateObject("WScript.Shell")
WshShell.Run chr(34) & "hidden.bat" & Chr(34), 0
Set WshShell = Nothing

This executes the batch file without command window, and the batch file executes your app.

Not a nice solution, but works:)

i've also found a software for this:
hstart by NTWind (Google it)

Regards:
Imre Horvath

Re: I seem to be missing a crucial piece here.

Sun, 30 May 2010 02:24:50 -0700

Posted a 'reply on the Python forum.

This post has been deleted.

Re: How can I use gtkmm with MinGW (g++) without MSYS?

Sun, 30 May 2010 01:36:42 -0700

Posted a 'reply on the C and C++ forum.

So, i've installed gtkmm-win32-devel-2.20.0-1.exe and MinGW-5.1.6.exe (with MinGW Base Tools, g++ and MinGW Make).
Add c:\mingw\bin to the path (gtkmm puts itself into path during install)

Then I can compile your program:
get pkg-config output:

C:\Documents and Settings\warden\Asztal\mingw>pkg-config gtkmm-2.4 --libs --cfl
ags
-mms-bitfields -IC:/gtkmm/include/gtkmm-2.4 -IC:/gtkmm/lib/gtkmm-2.4/include -IC
:/gtkmm/include/giomm-2.4 -IC:/gtkmm/lib/giomm-2.4/include -IC:/gtkmm/include/pa
ngomm-1.4 -IC:/gtkmm/lib/pangomm-1.4/include -IC:/gtkmm/include/gtk-2.0 -IC:/gtk
mm/include/atkmm-1.6 -IC:/gtkmm/include/gdkmm-2.4 -IC:/gtkmm/lib/gdkmm-2.4/inclu
de -IC:/gtkmm/include/glibmm-2.4 -IC:/gtkmm/lib/glibmm-2.4/include -IC:/gtkmm/in
clude/glib-2.0 -IC:/gtkmm/lib/glib-2.0/include -IC:/gtkmm/include/sigc++-2.0 -IC
:/gtkmm/lib/sigc++-2.0/include -IC:/gtkmm/include/cairomm-1.0 -IC:/gtkmm/lib/cai
romm-1.0/include -IC:/gtkmm/include/pango-1.0 -IC:/gtkmm/include/cairo -IC:/gtkm
m/include/freetype2 -IC:/gtkmm/include -IC:/gtkmm/include/libpng14 -IC:/gtkmm/li
b/gtk-2.0/include -IC:/gtkmm/include/atk-1.0 -LC:/gtkmm/lib -lgtkmm-2.4 -latkmm
-1.6 -lgdkmm-2.4 -lgiomm-2.4 -lpangomm-1.4 -lgtk-win32-2.0 -lglibmm-2.4 -lcairom
m-1.0 -lsigc-2.0 -lgdk-win32-2.0 -latk-1.0 -lgio-2.0 -lgdk_pixbuf-2.0 -lpangowin
32-1.0 -lgdi32 -lpangocairo-1.0 -lpango-1.0 -lcairo -lgobject-2.0 -lgmodule-2.0
-lgthread-2.0 -lglib-2.0 -lintl

Append it after g++:

g++ base.cc -o base -mms-bitfields -IC:/gtkmm/include/gtkmm-2.4 -IC:/gtkmm/lib/gtkmm-2.4/include -IC:/gtkmm/include/giomm-2.4 -IC:/gtkmm/lib/giomm-2.4/include -IC:/gtkmm/include/pangomm-1.4 -IC:/gtkmm/lib/pangomm-1.4/include -IC:/gtkmm/include/gtk-2.0 -IC:/gtkmm/include/atkmm-1.6 -IC:/gtkmm/include/gdkmm-2.4 -IC:/gtkmm/lib/gdkmm-2.4/include -IC:/gtkmm/include/glibmm-2.4 -IC:/gtkmm/lib/glibmm-2.4/include -IC:/gtkmm/include/glib-2.0 -IC:/gtkmm/lib/glib-2.0/include -IC:/gtkmm/include/sigc++-2.0 -IC:/gtkmm/lib/sigc++-2.0/include -IC:/gtkmm/include/cairomm-1.0 -IC:/gtkmm/lib/cairomm-1.0/include -IC:/gtkmm/include/pango-1.0 -IC:/gtkmm/include/cairo -IC:/gtkmm/include/freetype2 -IC:/gtkmm/include -IC:/gtkmm/include/libpng14 -IC:/gtkmm/lib/gtk-2.0/include -IC:/gtkmm/include/atk-1.0 -LC:/gtkmm/lib -lgtkmm-2.4 -latkmm-1.6 -lgdkmm-2.4 -lgiomm-2.4 -lpangomm-1.4 -lgtk-win32-2.0 -lglibmm-2.4 -lcairomm-1.0 -lsigc-2.0 -lgdk-win32-2.0 -latk-1.0 -lgio-2.0 -lgdk_pixbuf-2.0 -lpangowin32-1.0 -lgdi32 -lpangocairo-1.0 -lpango-1.0 -lcairo -lgobject-2.0 -lgmodule-2.0 -lgthread-2.0 -lglib-2.0 -lintl

It compiled without errors...

You have to add these options manually, bacause windows doesn't understand ``. It's what MSYS for.

I've tried your command line, it doesn't work. As I can remember, I faced a problem like this some years ago, then i've got 2 pkg-config. One in c:\gtkmm\bin and one in mingw (maybe in MSYS). Make sure you use the one in c:\gtkmm\bin

Regards:
Imre Horvath

Re: problem with string compare

Sun, 30 May 2010 00:16:46 -0700

Posted a 'reply on the Beginner C/C++ forum.

In the first case foo[] and bar[] are pointers (Like foo * and bar *). They're holding 2 different memory address. On both addresses in memory is the same data "hello".
With foo==bar, you compare the TWO MEMORY ADDRESS, and they're different.

With string, foo and bar is a std::string object. String objects have their own compare function.
With foo==bar you invoke the string's compare function, which compares THE DATA IN THE STRINGS, and they are the same ("hello")

Hope it helps:
Imre Horvath

Re: Array and string

Sat, 29 May 2010 12:34:46 -0700

Posted a 'reply on the C and C++ forum.

In c, they are basically the same:
String is an array of chars:

char * string = 'foo';
char[] chararray = 'bar';

You can use a string as array:

printf("%c", string[1]); // prints 'o'

And an array as string:

printf("%s", chararray); // prints 'bar'

(Basically, the [] and * operators are 'equivalent':

int main(int argc, char **argv);
int main(int argc, char* argv[]);

are the same...)

Regards:
Imre Horvath
Regards: -blemidon-

Re: How can I use gtkmm with MinGW (g++) without MSYS?

Sat, 29 May 2010 12:07:34 -0700

Posted a 'reply on the C and C++ forum.

Hi!

What was the error message without MSYS?

It was long time ago, but as I can remember, I add the command line options to g++ manually.
I mean, see the pkg-config output, and add it manually after g++. It worked for me.
(I'll try it again tomorrow)

Now I'm using Fedora, it includes the win32 mingw binaries, so you can generate win32 executables without windows :) I think it's the better solution:)

Regards:
Imre Horvath
Regards: -blemidon-

Re: I seem to be missing a crucial piece here.

Sat, 29 May 2010 11:51:13 -0700

Posted a 'reply on the Python forum.

You can declare a variable with None value (It's the same as NULL in c), it means 'Nothing':
name = None
for tuples, dirs, arrays you can do this:
t = ()
d = {}
a = []

If you want to change a global var from function, use global:

name = None # it's empty, but declared
def getUsrName():
global name
name = 'someone'

This changes the global name to 'someone'

Hope this helps:
Imre Horvath
Regards: -blemidon-