dev-cpp-users Mailing List for Dev-C++ (Page 735)

I've forgot to mention the last line is also eronous
 it shold be 
    delete []name_of_the_your_varible




Zsombor

On Wed, 10 Jan 2001, Alan Thomas wrote:

> I could not compile the code below.        Thanks, Alan
> entry_var new int[size_of_entry]; 
> if(!entry_var)
> {
>     cout << "Unable to allocate memory!";
>     getch();
>     exit(-1);
> }
> 
> delete(entry_var);

There are several problems with your code, firstly the syntax of line
containing the new operator is wrong, correctly it would bee  
 int *entry_var = new int[size_of_entry]; 
Then again it is not advisable to use the getch() function, because it
laks the portability, some compilers like TC++ suport this one, but I
stronglly doubt that compilers from the Linux world like g++, the one 
used by DevCpp will accept it.
 Lastly, the code promotes a bad style,  imagine that you write a program
were you allocate memory in lots of places (lines in the source code) and
you defend each allocation with a check, like you did (and you
should), this would lead to a code filled with error ckecks and still
bugy. What will you do if an allocation fails in a low level function,
because exit() will do no cleanup. Returning an error code will not solve
your problem beacuse soon you will have to face the nightmare of
errorpropagation trough different levels. The solution would be exception
handling suported by all modern compilers, like the one used by DevCpp. 

Generaly it would be:

try
{
    //do anything 
}
catch(...) //or a more specific type
{
  cerr<<"Failed to (something)"<<endl; //this can be more specific  
}

 You can find more info in any C++ manual. 





 

Use something like the following.

#ifdef TST1_EXPORTS
#define TST1_API __declspec(dllexport)
#else
#define TST1_API __declspec(dllimport)
#endif

// This class is exported from the tst1.dll
class TST1_API CTst1 {...};

extern TST1_API int nTst1;

TST1_API int fnTst1(void);

This exports the definition of the class, function or variable so it =
can be
used by a another program.

When you compile the DLL place a #define TST1_EXPORTS before the =
#include of
the .h file, so that it exports the definitions correctly. The users of =
your
DLL will not define it and so will import the definitions in the DLL.

If you use a .def file to specify the ordinal number for the function =
etc.
then when you issue version 2 of the DLL other programs will not have =
to be
recompiled.

If you do not include a .def file then the compiler will give the =
function
an ordinal number and the next version may give it another number. As =
this
number is used to bind the client call to the DLL, if it is different =
it
will fail. By defining the ordinal number yourself you ensure that it =
will
always be the same.

Example from MSVC++

LIBRARY MFC42 ; This is the name of the DLL

EXPORTS
 DllGetClassObject @ 1 PRIVATE
 DllCanUnloadNow @ 2 PRIVATE
 DllRegisterServer @ 3 PRIVATE
 DllUnregisterServer @ 4 PRIVATE
; MFC 4.2(final release)
 ??0_AFX_CHECKLIST_STATE@@QAE@XZ @ 256 NONAME

Unfortunately you also need to find the mangled name of the function to =
put
into the definition file.

This is taken from what I can remember of MSVC++ but I'm sure that it =
is the
same for Dev-C++.

Regards,

James.


-----Original Message-----
From: Jose Manuel Padron Carrillo [mailto:jos...@ya...]
Sent: Friday, January 12, 2001 8:02 AM
To: dev...@li...
Subject: Re: [Dev-C++] Dll export



--- ShadowOz <sha...@da...> escribi=F3: > Hello everybody
>=20
> Here=B4s my question:
>=20
> I=B4m trying to create a simple dll, with function I that want to be
> used by
> other application.
> Q: How can I make those functions acessible to the others
> applications?
>=20
> thx.
>=20
> Ae galera .pt, t=E1 muito frio a=ED? :-)
>=20
>=20

I'm not sure, but you can use the function LoadLibrary() and the call
the function.

At least that is what I use when I want to use InitCommonControls(). I
always load the library before.

Chemanuel=20

http://www.geocities.com/josempadron/


__________________________________________________
Do You Yahoo!?
Yahoo! Photos - Share your holiday photos online!
http://photos.yahoo.com/

_______________________________________________
Dev-cpp-users mailing list
Dev...@li...
http://lists.sourceforge.net/lists/listinfo/dev-cpp-users


* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *=20
This electronic message and any attachment is intended to be=20
read by the named addressee(s) only.=20
Any other recipient should be aware that its contents may be=20
legally privileged and/or confidential and that its use,=20
disclosure, copying or distribution may be unlawful.=20
Unless you are a named addressee, please delete this message=20

Whilst C. & J. Clark International Limited has taken steps=20
to prevent the transmission of computer viruses with electronic mail,=20
responsibility for screening incoming messages and the risk of such=20
transmission and its consequences lies with the recipient.=20

C. & J. Clark International Limited=20
Registered in England and Wales=20
Company No. 141015=20
Registered Office: 40 High Street, Street, Somerset BA16 0YA=20
Telephone: +44 (0) 1458 443131=20
Fax: +44 (0) 1458 447547=20

--- ShadowOz <sha...@da...> escribió: > Hello everybody
> 
> Here´s my question:
> 
> I´m trying to create a simple dll, with function I that want to be
> used by
> other application.
> Q: How can I make those functions acessible to the others
> applications?
> 
> thx.
> 
> Ae galera .pt, tá muito frio aí? :-)
> 
> 

I'm not sure, but you can use the function LoadLibrary() and the call
the function.

At least that is what I use when I want to use InitCommonControls(). I
always load the library before.

Chemanuel 

http://www.geocities.com/josempadron/


__________________________________________________
Do You Yahoo!?
Yahoo! Photos - Share your holiday photos online!
http://photos.yahoo.com/

--- Ramana Kumar <ra...@my...> escribió: > Does anyone know
where the latest version of win32.hlp (the Win32 SDK
> reference help) is?

Yes, but it is called b5ms.zip because is distributed by Borland
Check at http://www.geocities.com/josempadron/eng/tutorials.htm
I give 3 possible places to download it. The one of Borland didn't work
for me.

> I found from the mingw website that Jacob Navia got granted
> permission to
> distrubute it (from Microsoft) but the version on the website is old.

Yes, that's correct.

> Is it the same as the MSDN
> Platform SDK library (the online one), in which case, can I get a
> .chm or .hlp version of that?

b5ms is the most complete version in .hlp format. The only full version
is the Platform SDK. However, Borland's version plus Jacob's Navia
additions make provide a good reference manual

Chemanuel
http://www.geocities.com/josempadron/

__________________________________________________
Do You Yahoo!?
Yahoo! Photos - Share your holiday photos online!
http://photos.yahoo.com/

Hi everyone
I’m writing a windows program in which I use PlaySound() to, well, play a
sound. In this case, the sound is quite long/big so whenever a call to
PlaySound() is made to play this sound, the program stops for a while, loads
it (I’m guessing), and then starts playing.

I would like to be able to load the sound before I have to play it. In much
the same way as many games have a “loading” period before the game starts
(where it says loading… please wait) I would like to load my resources into
memory and inform the user that I am loading at the start of the program.

I believe that some functions like LoadBitmap() and LoadIcon() do the job of
loading into memory (not informing that we’re loading) but there is no such
function for a WAVE resource (used by PlaySound()). I thought that
LoadResource() might do the job (I’m getting these functions from some Win32
SDK documentation) but it doesn’t.

So if anyone knows how to do this could you please tell me?
Thanks,
Ramana

Does anyone know where the latest version of win32.hlp (the Win32 SDK
reference help) is?
I found from the mingw website that Jacob Navia got granted permission to
distrubute it (from Microsoft) but the version on the website is old. If
there is a new version, where can I get it? Is it the same as the MSDN
Platform SDK library (the online one), in which case, can I get a .chm or
.hlp version of that?

Thank you,
Ramana

Hi:

I am trying to migrate a program written under Linux C, to compile & run =
it under Windows. I am finding problems with the sockets libraries. (I =
take it they are different). Can anybody tell me some about the socket =
lib in dev C++.? Will the functions be different ?

thanks

chris

confirm 357455

_________________________________________________________
Do You Yahoo!?
Get your free @yahoo.com address at http://mail.yahoo.com

Try
 
int entry_var new int[size_of_entry];
 
You still have to specify what the type of entry_var is.

Regards, 

James. 

 

-----Original Message-----
From: Alan Thomas [mailto:ala...@3n...]
Sent: Thursday, January 11, 2001 2:56 AM
To: dev...@li...
Subject: Re: [Dev-C++] dynamic array


I could not compile the code below.        Thanks, Alan
 
From:  <mailto:ste...@ge...> ste...@ge...
Subject: Re: [Dev-C++] dynamic array
Date: Wed, 10 Jan 2001 05:12:37 -0800

entry_var new int[size_of_entry];
if(!entry_var)
{
    cout << "Unable to allocate memory!";
    getch();
    exit(-1);
}
 
delete(entry_var);

 



* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * 
This electronic message and any attachment is intended to be 
read by the named addressee(s) only. 
Any other recipient should be aware that its contents may be 
legally privileged and/or confidential and that its use, 
disclosure, copying or distribution may be unlawful. 
Unless you are a named addressee, please delete this message 

Whilst C. & J. Clark International Limited has taken steps 
to prevent the transmission of computer viruses with electronic mail, 
responsibility for screening incoming messages and the risk of such 
transmission and its consequences lies with the recipient. 

C. & J. Clark International Limited 
Registered in England and Wales 
Company No. 141015 
Registered Office: 40 High Street, Street, Somerset BA16 0YA 
Telephone: +44 (0) 1458 443131 
Fax: +44 (0) 1458 447547 

--- Emry <em...@te...> escribió: > some headers define TRUE and
FALSE I think.
> HOWEVER they are not needed, since true, and false are defined by
> default.
> 
> Just write them all lowercase. :)

That depends if you're doing Windows programming or not. You'll be
surprised if you declare bool instead of BOOL the return type of a
DialogProcedure.

bool is 1 byte long, and can only take the values 'true' or 'false'.
BOOL is a typedef or #define for int.

Chemanuel

__________________________________________________
Do You Yahoo!?
Yahoo! Photos - Share your holiday photos online!
http://photos.yahoo.com/

Instead of -ldismgc try putting in c:\dev-c++\lib\libdismgc.a
If this doesn't work, check all your source files for any uncommented
rubbish (especially at the top of the file where you don't usually look) and
make sure you are compiling for win32 (no console).

I hope you manage to fix your problem,
Ramana

-----Original Message-----
From: dev...@li...
[mailto:dev...@li...]On Behalf Of Miguel Nunes
da Silva
Sent: Thursday, January 11, 2001 4:42 AM
To: Dev-C++
Subject: [Dev-C++] Usage of a library

Hello everybody!

Here´s my problem:

I´m trying to use "dislin" graphical library  that, in anticipation, I
had put in the "\Dev-C++\lib" directory. So I wrote

-ldismgc

in Project options - Futher object files.

At link time it gives errors like these:

C:\DEV-C_~1\LIB\\libdismgc.a(wgini.o)(.text+0x4890):wgini.c: undefined
reference to `GetStockObject@4'
C:\DEV-C_~1\LIB\\libdismgc.a(wgini.o)(.text+0x4960):wgini.c: undefined
reference to `GetTextMetricsA@8'
C:\DEV-C_~1\LIB\\libdismgc.a(wgini.o)(.text+0x4985):wgini.c: undefined
reference to `DeleteDC@4'


Could anyone explain me what´s happening, please?

By the way, what are those .def files, in "\Dev-C++\lib", for?

Many thanks,
Miguel.




_______________________________________________
Dev-cpp-users mailing list
Dev...@li...
http://lists.sourceforge.net/mailman/listinfo/dev-cpp-users

Fabien,
                The code below would not compile.  It could not find =
"size_of_entry."  Am I simply missing an #include header file?

                                                                         =
                       Thanks, Alan

From: "Fabien VIVES" <fv...@fr...>
Subject: Re: [Dev-C++] dynamic array
Date: Wed, 10 Jan 2001 12:30:58 +0100

int (*buffer)[];

buffer=3D(int*)malloc(size_of_entry*sizeof(int));

free(buffer);

I could not compile the code below.        Thanks, Alan

From: ste...@ge...
Subject: Re: [Dev-C++] dynamic array
Date: Wed, 10 Jan 2001 05:12:37 -0800

entry_var new int[size_of_entry];
if(!entry_var)
{
    cout << "Unable to allocate memory!";
    getch();
    exit(-1);
}

delete(entry_var);

Is there a way, compatible with both Windows and Unix, to traverse =
directories?  I would like to build programs to index HTML files and =
search the indices, to be used on a web page.  To make a long story =
short, the easiest way to do this is to do the indexing from a PC =
(accesses the Unix web server like a network drive) and do the searching =
on the Unix server.  In both cases I have to be able to get around in =
both the Windows and Unix directory structures.

            For other projects, I have been using C++ and the DevC++ =
compiler.            Thanks, Alan
   =20

opengl has good libraries for 2D and 3D graphics.
download from http://www.opengl.org/
  ----- Original Message -----=20
  From: PAULO SERGIO AGUIAR FERREIRA VERISSIMO=20
  To: dev...@li...=20
  Sent: Tuesday, January 09, 2001 8:02 PM
  Subject: [Dev-C++] create 3d games



  paulo sergio aguiar=20

  Q: Can i create 3d vedio games whit this software ,i download dev-c++?
  Q:The source code for create 3d games do you have?

  div...@ne...

Hello everybody

Here´s my question:

I´m trying to create a simple dll, with function I that want to be used by
other application.
Q: How can I make those functions acessible to the others applications?

thx.

Ae galera .pt, tá muito frio aí? :-)

Although in C++ when you program in the recommended style, that is using the
standard containers and the rest of high level constructs, you will almost
never need to allocate manually memory space. In this way you have huge
control of your code at the optimum speed and resource utilisation.


Ioannis

> -----Original Message-----
> From: Ioannis Vranos [mailto:no...@ya...]
> Sent: Thursday, January 11, 2001 12:49 AM
> To: dev...@li...
> Subject: RE: [Dev-C++] dynamic array
>
>
> In C you can use malloc(), calloc() and realloc(). In C++ new and
> delete operators.
>
>
> Ioannis

In C you can use malloc(), calloc() and realloc(). In C++ new and delete
operators.


Ioannis

> -----Original Message-----
> From: dev...@li...
> [mailto:dev...@li...]On Behalf Of Alan Thomas
> Sent: Wednesday, January 10, 2001 5:01 AM
> To: dev...@li...
> Subject: [Dev-C++] dynamic array
>
>
>         How do you dynamically allocate space for an array?   I have a
> program that works but is awkward in one aspect and potentially slow (for
> large input files).  It performs operations on a file containing a
> particular format of calendar entries.  Because I did not wish to
> initially
> deal with dynamically allocating memory as I read in calendar entries, I
> first read through the file just cueing on an end of entry character, to
> count the number of entries.  Then I declare an array of the appropriate
> size, which will be used to hold processed information for each entry.
>
>             This works fine for current input file sizes, but could slow
> things down noticeably if the input file was an order of magnitude larger.
> So, the alternative would be to allocate space as I read in entries.
>
> Thanks, Alan
>
>
>
>
>
> _______________________________________________
> Dev-cpp-users mailing list
> Dev...@li...
> http://lists.sourceforge.net/mailman/listinfo/dev-cpp-users
>

paulo sergio aguiar=20

Q: Can i create 3d vedio games whit this software ,i download dev-c++?
Q:The source code for create 3d games do you have?

div...@ne...

Hello everybody!

Here´s my problem:

I´m trying to use "dislin" graphical library  that, in anticipation, I
had put in the "\Dev-C++\lib" directory. So I wrote

-ldismgc

in Project options - Futher object files.

At link time it gives errors like these:

C:\DEV-C_~1\LIB\\libdismgc.a(wgini.o)(.text+0x4890):wgini.c: undefined
reference to `GetStockObject@4'
C:\DEV-C_~1\LIB\\libdismgc.a(wgini.o)(.text+0x4960):wgini.c: undefined
reference to `GetTextMetricsA@8'
C:\DEV-C_~1\LIB\\libdismgc.a(wgini.o)(.text+0x4985):wgini.c: undefined
reference to `DeleteDC@4'


Could anyone explain me what´s happening, please?

By the way, what are those .def files, in "\Dev-C++\lib", for?

Many thanks,
Miguel.

confirm 736356
_________________________________________________________________________
Get Your Private, Free E-mail from MSN Hotmail at http://www.hotmail.com.

With you're writting your program in C you can use:

int (*buffer)[];

buffer=(int*)malloc(size_of_entry*sizeof(int));

Then you can use your variable "buffer" as you would do with any array.
When you have finished to use your buffer do

free(buffer);

VIVES Fabien.
----- Original Message -----
From: "Alan Thomas" <ala...@3n...>
To: <dev...@li...>
Sent: Wednesday, January 10, 2001 4:00 AM
Subject: [Dev-C++] dynamic array


>         How do you dynamically allocate space for an array?   I have a
> program that works but is awkward in one aspect and potentially slow (for
> large input files).  It performs operations on a file containing a
> particular format of calendar entries.  Because I did not wish to
initially
> deal with dynamically allocating memory as I read in calendar entries, I
> first read through the file just cueing on an end of entry character, to
> count the number of entries.  Then I declare an array of the appropriate
> size, which will be used to hold processed information for each entry.
>
>             This works fine for current input file sizes, but could slow
> things down noticeably if the input file was an order of magnitude larger.
> So, the alternative would be to allocate space as I read in entries.
>
> Thanks, Alan
>
>
>
>
>
> _______________________________________________
> Dev-cpp-users mailing list
> Dev...@li...
> http://lists.sourceforge.net/mailman/listinfo/dev-cpp-users
>

some headers define TRUE and FALSE I think.
HOWEVER they are not needed, since true, and false are defined by default.

Just write them all lowercase. :)



Original message from: "Alan Thomas"
>            Are TRUE and FALSE provided somewhere as a standard definition
>in a C++ library or something?  I have been defining them myself, but now I
>have problems with multiple definitions or something in header files.  When
>I remove the multiple definitions, then TRUE and FALSE are no longer defined
>in "this scope."
>                              Thanks, Alan
>
>
>
>_______________________________________________
>Dev-cpp-users mailing list
>Dev...@li...
>http://lists.sourceforge.net/mailman/listinfo/dev-cpp-users
>

confirm 653397