dev-cpp-users — Dev-C++ users discussion list

RE: [Dev-C++] Question "." vs "->"

[Reid T. <Rei...@at...>]

pull out your textbook/tutorial and read about structures and pointers
to structures

reid


> -----Original Message-----
> From: vasanthsena x [mailto:vas...@ya...]=20
> Sent: Monday, November 03, 2003 3:13 PM
> To: dev...@li...
> Subject: [Dev-C++] Question "." vs "->"
>=20
>=20
> Hi I have written a program where I want to access a
> structure member.when I use "->" it gives me an error
> which says invalid type of argument."." on the other
> hand works just fine. Any thoughts on why this could
> happen.
>=20
> S.
>=20
> __________________________________
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> help you create better code?   SHARE THE LOVE, and help us help
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>=20

Re: [Dev-C++] Question "." vs "->"

[Zodiaq <zo...@ac...>]

Hello vasanthsena and all Dev-C++ users,

Monday, November 3, 2003, 9:13:09 PM, vasanthsena wrote as follows:

vx> Hi I have written a program where I want to access a
vx> structure member.when I use "->" it gives me an error
vx> which says invalid type of argument."." on the other
vx> hand works just fine. Any thoughts on why this could
vx> happen.

Huh, problems with major C++ features we have??? So remember this till end
of your life:
- use . for references to objects created normally ( Class_name object) and
for object passed by reference or value:
void function( Class_name object )//pass by value, copy object created
{
  object.value = 13;

void function( const Class_name &object ) //pass by reference
{
  if( object.value == 3 )

use -> for object created on stack using operator new or passed using
pointer:

//example of passing object using pointer
Class_name object;
function( &object );

//function body
void function( Class_name *object )
{
  object->value = 11;

//creating object on stack
Class_name *object = new Class_name( 7 );
if( object->value == 6 )
  ...

btw. get a good book and start learning C++ from the begining - these are
fundamental features of C++
  
-- 
regards, Zodiaq

[Dev-C++] Question "." vs "->"

[vasanthsena x <vas...@ya...>]

Hi I have written a program where I want to access a
structure member.when I use "->" it gives me an error
which says invalid type of argument."." on the other
hand works just fine. Any thoughts on why this could
happen.

S.

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[Dev-C++] I don't like Win32

[Maya <Esc...@ne...>]

Using MSYS, I have just 'configure(d)',  'make(d)' and 'make 
install(ed)' the Fox GUI tool kit. Now hot do I go about compiling using 
this library in Dev-CPP?

TIA

-- 

Jorge Escalante
FYI
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  innocent, and that's power. 
                                - Malcom X
* "Innocent until proven guilty", no... not in Canada!!

[Dev-C++] Debugggg!!

[Paul H. <dra...@ne...>]

Sorry for bringing this up again! But I've looked on the net and =
archives and I cant find any instuctions for linking or installing =
'insight5_win32.zip' I'm sure people know how to do it! Just asking for =
some help!=20
I've got Dev-C++ 4.01 maybe that will help!

P.S. I've heard of the self extracting version but the links dont seem =
to work! The link that I did get does'nt give me any instructions! HELP! =
This is driven me crazy!

Paul

Re: [Dev-C++] STL stack/vector pushing class objects

[Hossein H. <ult...@em...>]

Dear Matt,

> My question is:
> In the following scenario where you are using STL stack or vector 
> container with a class object, ie:
> 
> stack<board> moves;
> 
> if you do something like:
> 
> moves.push( thismove );
> 
> Does thismove get copied or is it passed into the stack by reference?

void push(const value_type&) 

This is the signature of stack<>::push(). I think it is self-defintive, isn't it?

Regards,
--Hossein
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Re: [Dev-C++] undefined reference to ...

[Hossein H. <ult...@em...>]

Dear Philippe,

> Anyone know why this doesn't work... I cut the problem to this simple
> form, only one source file (main.cpp).  I'm getting an undefined
> reference to foo::m_instance.  If m_instance were not defined as static
> all would be ok.
> 
> I'm using Dev-cpp ver 4.9.8.3
> 
> Help appreciated...
> 
> 
> #include <iostream>
> #include <stdlib.h>
> 
> using namespace std;
> 
> class foo {
> private:
>   static foo* m_instance;
> public:
>   static foo* Instance();
> };
> 
> foo* foo::Instance()
> {
>   if (m_instance == NULL) 

Is the error occuring here? If yes, it seems to be a run-time error, huh? If the answer is
again yes, hmmm..., it seems to be arisen because of the fact that the static members must
be initialised outside any body in programme.

>     m_instance = new foo;
>   return m_instance;
> }

Try this one, for example:

class Foo{/*Whatever it was*/};
foo* Foo::m_instance = new foo;

Regards,
--Hossein

PS: Is this assumed to be a "Singleton" holder class? If yes, why not using the excellent
implelmented free ones? E.g., you can use Loki::SingletonHolder which can be freely
downloaded from http://www.moderncppdesign.com. I'm not sure, but it seems that there must
be some similar stuff in the Boost's gient repositary. (http://www.boost.org)
-- 
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[Dev-C++] installing Insight Debugger

[Paul H. <dra...@ne...>]

Can anyone please tell me how to install Insight Debugger on Dev-C++? I =
have the files! Thanks

Re: [Dev-C++] Windows Programming

[<seb...@sk...>]

The tutorials' crypt ;) : http://www.bloodshed.net/dev/doc/index.html
  ----- Original Message -----=20
  From: Paul Hester=20
  To: dev...@li...=20
  Sent: Sunday, November 02, 2003 9:51 AM
  Subject: [Dev-C++] Windows Programming


  Do you know of any good windows programming turtorials for Dev-C++? =
Thank You!

[Dev-C++] Windows Programming

[Paul H. <dra...@ne...>]

Do you know of any good windows programming turtorials for Dev-C++? =
Thank You!

[Dev-C++] Code completion

[Pascal <p.t...@ti...>]

Hi,

How to use code completion and is it enabled for all language?
I'm starting in C ANSI.

Re: [Dev-C++] undefined reference to ...

[Michal M. <mi...@mo...>]

Philippe Parent wrote:

> class foo {
> private:
>   static foo* m_instance;
     ^^^^^^^^^^^^^^^^^^^^^^^
this is only declaration, you have to define it also somewhere, e.g.:

class foo {
    static foo* m_instance;  // declaration
};
foo* foo::m_instance = 0;   // definition

[Dev-C++] Managed C++

[Daniel G. <sp...@ho...>]

i guys,
does anyone know a good resource to find out about managed C++ ? I'm 
thinking a website rather than a book.

Daniel

_________________________________________________________________
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[Dev-C++] undefined reference to ...

[Philippe P. <pp...@un...>]

Anyone know why this doesn't work... I cut the problem to this simple
form, only one source file (main.cpp).  I'm getting an undefined
reference to foo::m_instance.  If m_instance were not defined as static
all would be ok.

I'm using Dev-cpp ver 4.9.8.3

Help appreciated...


#include <iostream>
#include <stdlib.h>

using namespace std;

class foo {
private:
  static foo* m_instance;
public:
  static foo* Instance();
};

foo* foo::Instance()
{
  if (m_instance == NULL) 
    m_instance = new foo;
  return m_instance;
}


int main(int argc, char *argv[])
{
  
  system("PAUSE");	
  return 0;
}
-- 
Philippe Parent 
Programmer Analyst 
Integrated Technology Services 
University of New Brunswick 
PO Box 4400 
Fredericton, NB, Canada, E3B 5A3 
Phone (506) 453 3563 
Fax (506) 453 3590

[Dev-C++] stats graphics lib

[Guillermo K. <gui...@ya...>]

Hi, need some advise.
I'm looking for a lib that can allow me to save .png or .jpeg files of
stats graphics (Bar, Lines, Pie, etc) something like chart in perl. For
win32
thanks

Re: [Dev-C++] about gcc

[<or...@vp...>]

P.D. van Zelst wrote:
> The later "full package" releases include the 3.2 compiler... I suppose you
> haven't downloaded a full package in a long time :P

Actually, I NEVER downloaded a full package, just the IDE :)

But if you read again, you'll see that I wrote, that Dev-C++ uses 2.95 
*features* and *tools*, by which I meant, that though GCC 3.2 contains 
dllwrap, and other things for backward compatibility, those are still 
considered outdated, and the new ways of compiling should be used. Even 
the latest full package of Dev-C++ still uses dllwrap.
Which is slow and old. :P

--
Greetings,
   Balázs

[Dev-C++] Working with with graphics in DOS Windows

[<and...@su...>]

Dear Users,

   I need to build some pictures on the screen and it must be in a DOS
window program (Console Application).
   I can use the Borland compilers that still support
graphics.h (line, clearviewport, circle, etc, etc, etc).

   -->Is there any library in Dev/gcc that gives me the same functions?
   -->If don´t, can I link in only one executabele file a borland .obj
file with anothers gcc .o files?

   Regards
   Andre

[Dev-C++] code completion and packages

[Glenn W. <gl...@mr...>]

A couple of questions.
=20
Is there a way to rebuild the library cache?  It crashed the first time =
I started the application after upgrading. It also doesn't appear to be =
completing code.  Is there a snippet of code that I can use to test the =
code completion features?
=20
I downloaded many of the available packages.  Is there an interface to =
access the new items through the application or do you have to find them =
in the application directory?

Sincerely,=20
Glenn Welker=20
Director of Product Development=20
MRH Technology Group=20

=20

Re: [Dev-C++] invalid converion from

[Per W. <pw...@ia...>]

See void* as a pointer of unknown type. If you do

char *charptr;
void *voidptr = xx;

charptr = (char*)voidptr;

then you tell the compiler that you know for sure that the typeless
voidptr is actually ok to treat as a pointer to char.

/Per W

On Fri, 31 Oct 2003, EXT-Meyer, Robert J wrote:

> When compiling tutorial examples, I keep getting 'invalid conversion from' errors. What do they mean?
>
> For example 'invalid conversion from 'void*' to 'CHAR*'
>
> or 'invalid conversion from 'void*' to 'HFONT__*' occuring on this piece of code under WndProc:
>
> 		case WM_CREATE:
> 		{
> 			HFONT hfDefault;
> 			HWND hEdit;
>
> 			hEdit = CreateWindowEx(WS_EX_CLIENTEDGE, "EDIT", "",
> 				WS_CHILD | WS_VISIBLE | WS_VSCROLL | WS_HSCROLL | ES_MULTILINE | ES_AUTOVSCROLL | ES_AUTOHSCROLL,
> 				0, 0, 100, 100, hwnd, (HMENU)IDC_MAIN_EDIT, GetModuleHandle(NULL), NULL);
> 			if(hEdit == NULL)
> 				MessageBox(hwnd, "Could not create edit box.", "Error", MB_OK | MB_ICONERROR);
>
> 			hfDefault = GetStockObject(DEFAULT_GUI_FONT);
> 			SendMessage(hEdit, WM_SETFONT, (WPARAM)hfDefault, MAKELPARAM(FALSE, 0));
> 		}
> 		break;
>
> Thanks for any suggestions,
>
> Rob
>
>
>
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RE: [Dev-C++] about gcc

[P.D. v. Z. <pa...@my...>]

The later "full package" releases include the 3.2 compiler... I suppose =
you
haven't downloaded a full package in a long time :P
=20

-----Original Message-----
From: dev...@li...
[mailto:dev...@li...] On Behalf Of OROSZI
Bal=E1zs
Sent: Friday, October 31, 2003 2:53 PM
To: dev...@li...
Subject: Re: [Dev-C++] about gcc

mctimes wrote:
> Hi all,
>   The current release of devcpp is only support gcc 3.2. However, the=20
> newest version of gcc is 3.3.x. Accordingly to the documentation of=20
> gcc, some new features will only found on 3.3.x, I wonder why devcpp=20
> don't upgrade the compiler to the new version ????

Actually, Dev-C++ uses GCC 2.95 features and tools (like dllwrap), which =
is
heavily outdated. I really think too, that Dev-C++ *should* upgrade to =
the
latest (at LEAST 3.2) version of GCC.

--
Greetings,
   Bal=E1zs




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[Dev-C++] invalid converion from

[EXT-Meyer, R. J <rob...@bo...>]

When compiling tutorial examples, I keep getting 'invalid conversion =
from' errors. What do they mean?

For example 'invalid conversion from 'void*' to 'CHAR*'

or 'invalid conversion from 'void*' to 'HFONT__*' occuring on this piece =
of code under WndProc:

		case WM_CREATE:
		{
			HFONT hfDefault;
			HWND hEdit;

			hEdit =3D CreateWindowEx(WS_EX_CLIENTEDGE, "EDIT", "",=20
				WS_CHILD | WS_VISIBLE | WS_VSCROLL | WS_HSCROLL | ES_MULTILINE | =
ES_AUTOVSCROLL | ES_AUTOHSCROLL,=20
				0, 0, 100, 100, hwnd, (HMENU)IDC_MAIN_EDIT, GetModuleHandle(NULL), =
NULL);
			if(hEdit =3D=3D NULL)
				MessageBox(hwnd, "Could not create edit box.", "Error", MB_OK | =
MB_ICONERROR);

			hfDefault =3D GetStockObject(DEFAULT_GUI_FONT);
			SendMessage(hEdit, WM_SETFONT, (WPARAM)hfDefault, MAKELPARAM(FALSE, =
0));
		}
		break;

Thanks for any suggestions,

Rob

Re: [Dev-C++] about gcc

[<or...@vp...>]

mctimes wrote:
> Hi all,
>   The current release of devcpp is only support gcc 3.2. However, the
> newest version of gcc is 3.3.x. Accordingly to the documentation of gcc,
> some new features will only found on 3.3.x, I wonder why devcpp don't
> upgrade the compiler to the new version ????

Actually, Dev-C++ uses GCC 2.95 features and tools (like dllwrap), which 
is heavily outdated. I really think too, that Dev-C++ *should* upgrade 
to the latest (at LEAST 3.2) version of GCC.

--
Greetings,
   Balázs

Re: [Dev-C++] Scheduling algorithms

[Per W. <pw...@ia...>]

It normally doesn't help you to know about different scheduling
algorithms, since your OS will perform the scheduling for you.

About scheduling, there are a large number of good books. Look for
operating system internals or similar as keywords.

/Per W

On Fri, 31 Oct 2003, Smitha V. Babu wrote:

> hi all..
> I want to get some guidelines to meet my following requirement...
> I want to know abt the differnt types of sheduling algorithms used in real
> time systems...
> Instead of using the pthread concept...
> i want to use some other concept...
> Can anyone help me ..Can anyone give me guidelines...
> I am grateful to the earlier help get from this group....
> Thanks in advance..
> Sincerly
> smitha
> *********************************************************************
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Re: [Dev-C++] MySQL Link error

[Per W. <pw...@ia...>]

Try adding -lstdc++ to link with standard c++ libraries.

/Per W


On Fri, 31 Oct 2003, Guillermo Krepper wrote:

> Hi Per,
>
> yes in fact I was making a mistake with the linker, so I added
> "-lmySQL" and allso compiled the example, and this is what I get:
>
> -------------
> Compiler: Default compiler
> Building Makefile:
> "C:\Dev-Cpp\Examples\MySQLClientTest\Makefile.win"
> Executing  make...
> make.exe -f "C:\Dev-Cpp\Examples\MySQLClientTest\Makefile.win"
> all
> g++.exe -c MySQLClientTest.cpp -o MySQLClientTest.o
> -I"C:/Dev-Cpp/include/c++"  -I"C:/Dev-Cpp/include/c++/mingw32"
> -I"C:/Dev-Cpp/include/c++/backward"  -I"C:/Dev-Cpp/include"
> gcc.exe MySQLClientTest.o  -o "MySQLClientTest.exe"
> -L"C:/Dev-Cpp/lib" -lmySQL
> MySQLClientTest.o(.eh_frame+0x11):MySQLClientTest.cpp: undefined
> reference to `__gxx_personality_v0'
> make.exe: *** [MySQLClientTest.exe] Error 1
> Execution terminated
> -----------------
>
> Could this be a problem caused by the warning in
> http://www.bloodshed.net/dev/devcpp.html?
>
> " /!\ WARNING /!\ : Due to changes in the C++ ABI in GCC 3.2,
> some of the available Dev-C++ Packages for the C++ language will
> not work. Please read this for more information. "
>
>
>
>  --- Per Westermark <pw...@ia...> escribi=F3: > Where did
> you inform DevC++ that you wanted to link your
> > application with
> > the mysql library? From the compiler output, you can see where
> > the linker
> > looks for libraries (-L"C:/Dev-Cpp/lib"). However, that is not
> > enough. You
> > also have to tell it which extra libraries you need, such as
> > -lmySQL.
> >
> > Did you try c:\Dev-Cpp\Examples\MySQLClientTest?
> >
> > /Per W
> >
> > On Wed, 29 Oct 2003, Guillermo Krepper wrote:
> >
> > > Hi,
> > > =09I=B4m just starting to do some tests with MySQL, downloaded
> > and
> > > installed the Dev Pack. When I compile a simple test
> > application I get
> > > this link error.
> > > Need some advise, thanks.
> > >
> > > ----------
> > > Compiler: Default compiler
> > > Building Makefile: "D:\Dev\C++\sql\Makefile.win"
> > > Executing  make...
> > > make.exe -f "D:\Dev\C++\sql\Makefile.win" all
> > > g++.exe -c main.cpp -o main.o -I"C:/Dev-Cpp/include/c++"
> > > -I"C:/Dev-Cpp/include/c++/mingw32"
> > -I"C:/Dev-Cpp/include/c++/backward"
> > > -I"C:/Dev-Cpp/include"
> > > g++.exe main.o  -o "testSQL.exe" -L"C:/Dev-Cpp/lib"
> > > main.o(.text+0xfc):main.cpp: undefined reference to
> > `mysql_init@4'
> > > make.exe: *** [testSQL.exe] Error 1
> > > Execution terminated
> > > ----------
> > >
> > >
> > >
> > >
> > >
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[Dev-C++] Scheduling algorithms

[Smitha V. B. <smi...@so...>]

hi all..
I want to get some guidelines to meet my following requirement...
I want to know abt the differnt types of sheduling algorithms used in real
time systems...
Instead of using the pthread concept... 
i want to use some other concept...
Can anyone help me ..Can anyone give me guidelines...
I am grateful to the earlier help get from this group....
Thanks in advance..
Sincerly
smitha
*********************************************************************
Disclaimer: The information in this e-mail and any attachments is
confidential / privileged. It is intended solely for the addressee or
addressees. If you are not the addressee indicated in this message, you may
not copy or deliver this message to anyone. In such case, you should destroy
this message and kindly notify the sender by reply email. Please advise
immediately if you or your employer does not consent to Internet email for
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*********************************************************************