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

Re: [Dev-C++] Detecting the presence of a directory (was (no subject))

[David M. <ci...@ya...>]

chdir is #included from where?
 
Does it return a value?
 
If it does what value does it return and for what reason?
  ----- Original Message ----- 
  From:   Dondolo   Mpho 
  To: 'dev...@li...'   
  Sent: Friday, September 05, 2003 9:48   AM
  Subject: [Dev-C++] (no subject)
  

  
Can somebody help me with this code. asks you to   enter a folder name and users chdir() to check if the folder does   exist.
  
I am trying to get it to device names and tell me   if the device exist.....eg. 
  
  my computer name is AN1490812... so I would   like to find out if the divice name C:\\ does exit on my computer.   
Can anybody help? 



  
struct _finddata_t file; 
char name[64]; 
int   main(void) 
{ 
cout<<"Enter a folder name :"; 
cin>>name; 
chdir("C:\\"); 
long flag=0;   
if((flag=_findfirst(name,&file))==-1L)   
{ 
cout<<"No matching files\n"; 
} 
else if(file.attrib   &_A_SUBDIR) 
{ 
cout<<"\\found \n"; 
} 
system("PAUSE"); 
return 0; 
} 


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[Dev-C++] Static Control Flickers

[Janos M. <ma...@fr...>]

Hello everyone,

I`m working on a project (developing with dev-cpp) what measures voltage. 
Values must update every 100 milliseconds. Thats my problem. When I update 
the static controls like LTEXT and CTEXT, it flickers. Updating with 
SetDialogItemText and SetWindowText produce the same result. If I double 
buffer the static control, create a memory bitmap and a DC, and do a TextOut 
inside the control, and BitBlt it, it works fine, doesn`t flicker. My 
problem is, I didn`t found any solution to use SetDialogItemText correctly. 
I don`t think double buffer and TextOut is the best way to avoid flicker on 
static controls, because in this case the control is unneeded, but I would 
like to use some design stuff which static controls has, and don`t want to 
rewrite it.

Any ideas?

Ps.: Sorry for my english.

[Dev-C++] (no subject)

[Dondolo M. <MDo...@OL...>]

Can somebody help me with this code. asks you to enter a folder name and
users chdir() to check if the folder does exist.
I am trying to get it to device names and tell me if the device
exist.....eg.

  my computer name is AN1490812... so I would like to find out if the divice
name C:\\ does exit on my computer.
Can anybody help?




struct _finddata_t file;
char name[64];
int main(void)
{
cout<<"Enter a folder name :";
cin>>name;
chdir("C:\\");
long flag=0;
if((flag=_findfirst(name,&file))==-1L)
{
cout<<"No matching files\n";
}
else if(file.attrib &_A_SUBDIR)
{
cout<<"\\found \n";
}
system("PAUSE");
return 0;
}

[Dev-C++] Using context-sensitive help

[Edson T. M. M. <ta...@li...>]

 I think a feature greatly missed from Dev-C++ is a context-sensitive 
help function, that is, when the user press F1 and the mouse is over a 
function call from the standard libraries, it should open a help window 
on that function, with the parameters it expect and descriptions (same 
thing for types, or for #included headers -- should open a help on that 
header, with all classes and methods it implements). It improves coding 
speed a lot! Often I remember a function name that I must use, but I 
forget the parameter order, or some detail about it.
 
 This documentation, at least for the C language, is freely available 
from the gnu texinfo (e.g., on the glibc texinfo). I don't know if there 
is something similar for C++.

 Is there some plugin out there that implements this feature on Dev-C++? 
If not, at least, is there some kind of browser for the C and C++ 
standard libraries, that can be used along Dev-C++ ?

    Thanks in advance,
       Edson

Re: [Dev-C++] Access to filesystem

[w.y. <yok...@ve...>]

Matthews wrote:
> 
> For non-portable, use <io.h>, and _findfirst(), _findnext() and
> _findclose().  It's not hard to figure out, just save the find handle from
> _findfirst() in an int to use with _findclose().

Well, there isn't really a portable way to do it since there is no
concept of "directories" etc. in standard C and C++ unfortunately.

Even if you use the 'boost' libraries it wouldn't work unless
someone implemented the platform specific code on your target
machine.

This is one of the annoying omissions of the standard I wish they
would add.

RE: [Dev-C++] Access to filesystem

[Matthews <dem...@uw...>]

For non-portable, use <io.h>, and _findfirst(), _findnext() and
_findclose().  It's not hard to figure out, just save the find handle from
_findfirst() in an int to use with _findclose().

At 01:50 PM 04/09/2003 +0200, P.D. van Zelst wrote:
>You're probably best off using the Win32 API functions FindFirstFile,
>FindNextFile and FindClose... if you don't need portable code
>(cross-platform code). Those functions will give you information about
>the files matching a certain mask (*.txt for example) in the directory
>you specify. You can then use this information to open the files if you
>like. If you only need standard information, like the filesize for
>example, you don't need to do anything else -- FindFirstFile and
>FindNextFile already supply this information (using the WIN32_FIND_DATA
>struct).

[Dev-C++] Menu items with text <ERR: nnn>

[Torlach R. <tor...@ho...>]

After upgrading from 4.9.6.0 to 4.9.8.1 using vUpdate I see a number of 
additional menu items with the following text <ERR: xxx>, for example under 
File and immediately under Save As I see <ERR: 139>.
Am I missing a resource file of something like that?

Thanks,

Torlach

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[Dev-C++] Accessing Parallel Port in Windows XP

[Muhammad F. <fa...@cy...>]

Hi,

	Can anyone guide me about accessing Parallel Port directly (i mean without 
any drivers) in windows xp.

Thanks

Regards,
Farhan

RE: [Dev-C++] Access to filesystem

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

You're probably best off using the Win32 API functions FindFirstFile,
FindNextFile and FindClose... if you don't need portable code
(cross-platform code). Those functions will give you information about
the files matching a certain mask (*.txt for example) in the directory
you specify. You can then use this information to open the files if you
like. If you only need standard information, like the filesize for
example, you don't need to do anything else -- FindFirstFile and
FindNextFile already supply this information (using the WIN32_FIND_DATA
struct).


-----Original Message-----
From: dev...@li...
[mailto:dev...@li...] On Behalf Of
at...@su...
Sent: Thursday, September 04, 2003 1:29 PM
To: dev...@li...
Subject: [Dev-C++] Access to filesystem


just doing c++ exercises, while learning, and need to read? or open? all
files of a directory, but got no idea who to manage it.
while searching the libary, I found the following hits for "filesystem"

regstr.h:
- REGSTR_PATH_FILESYSTEM
TEXT("System\\CurrentControlSet\\Control\\FileSystem")
- REGSTR_PATH_FILESYSTEM_NOVOLTRACK
TEXT("System\\CurrentControlSet\\Control\\FileSystem\\NoVolTrack")
- REGSTR_PATH_CDFS
TEXT("System\\CurrentControlSet\\Control\\FileSystem\\CDFS")
- REGSTR_PATH_CDFS
TEXT("System\\CurrentControlSet\\Control\\FileSystem\\CDFS")REGSTR_VAL_W
IN31FILESYSTEM TEXT("Win31FileSystem")

shlobj.h:
- #define SFGAO_FILESYSTEM 0x40000000L

winnt.h:
- #pragma pack(pop)
typedef enum _CM_SERVICE_NODE_TYPE {
 DriverType=SERVICE_KERNEL_DRIVER,
 FileSystemType=SERVICE_FILE_SYSTEM_DRIVER,
 Win32ServiceOwnProcess=SERVICE_WIN32_OWN_PROCESS,
 Win32ServiceShareProcess=SERVICE_WIN32_SHARE_PROCESS,
 AdapterType=SERVICE_ADAPTER,
 RecognizerType=SERVICE_RECOGNIZER_DRIVER
} SERVICE_NODE_TYPE;

and some more in deeper files.
Is this the right way, and if, where will I get informations how to
handle?

even http://cplus.about.com/library/blcplustut.htm got no hits.

thanx

regards
Achim

[Dev-C++] Access to filesystem

[<at...@su...>]

just doing c++ exercises, while learning, and need to read? or open? all =
files of a directory, but got no idea who to manage it.
while searching the libary, I found the following hits for "filesystem"

regstr.h:
- REGSTR_PATH_FILESYSTEM =
TEXT("System\\CurrentControlSet\\Control\\FileSystem")
- REGSTR_PATH_FILESYSTEM_NOVOLTRACK =
TEXT("System\\CurrentControlSet\\Control\\FileSystem\\NoVolTrack")
- REGSTR_PATH_CDFS =
TEXT("System\\CurrentControlSet\\Control\\FileSystem\\CDFS")
- REGSTR_PATH_CDFS =
TEXT("System\\CurrentControlSet\\Control\\FileSystem\\CDFS")REGSTR_VAL_WI=
N31FILESYSTEM TEXT("Win31FileSystem")

shlobj.h:
- #define SFGAO_FILESYSTEM 0x40000000L

winnt.h:
- #pragma pack(pop)
typedef enum _CM_SERVICE_NODE_TYPE {
 DriverType=3DSERVICE_KERNEL_DRIVER,
 FileSystemType=3DSERVICE_FILE_SYSTEM_DRIVER,
 Win32ServiceOwnProcess=3DSERVICE_WIN32_OWN_PROCESS,
 Win32ServiceShareProcess=3DSERVICE_WIN32_SHARE_PROCESS,
 AdapterType=3DSERVICE_ADAPTER,
 RecognizerType=3DSERVICE_RECOGNIZER_DRIVER
} SERVICE_NODE_TYPE;

and some more in deeper files.
Is this the right way, and if, where will I get informations how to =
handle?

even http://cplus.about.com/library/blcplustut.htm got no hits.

thanx

regards
Achim

[Dev-C++] SoBig.F

[<age...@co...>]

One of you might have SoBig.F. Please check, I have been getting lots if virus 
e-mails.

--
~~Scott Simontis~~
Programmer

Re: [Dev-C++] numerical error in a simple program

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

Double-precision  numbers, at least the normal 8-byte IEEE-compliant type
have about 15 valid digits. Since you emit 15 digits after the decimal
point, the last digits will be wrong as soon as the number gets larger
than 1. For single precision float, you have about 8 valid digits.

If you adjust number of decimals so that total number of digits are <=3D 15=
,
the output will be correctly rounded.

If you don't need a fixed number of decimals, but just want to emit a
floating-point number, you might look into %g instead. It will
automatically adjust number of decimals emitted.

If you need an integer, don't just try (int)fp since that will truncate
the number. If the value was expected to be 3.0 but was 2.9999999999999
the integer will be set to 2. Instead do my_int =3D (int)(fp + 0.5) to
correctly round 2.49999 -> 2, 2.500001 -> 3. If you really want to
truncate, you should still do my_int =3D (int)(fp + EPS) where EPS is a
small number compared to expected range of fp, i.e. if fp is 0-100, set
EPS =3D 1E-10 or something. Note that fp / EPS must be smaller than 1E15
(should preferably be 1E10 - 1E13 or therearound) or fp + EPS will be
identical to fp because of cancellation, i.e. EPS will be so much smaller
than fp that during the add, EPS will be rounded to zero.

/Per W

On Wed, 3 Sep 2003, Lu=EDs Br=E1s wrote:

> When I try to compile this program:
>
> ********************************************
> #include <stdio.h> // printf
> #include <stdlib.h> // system
>
> int main(int argc, char *argv[])
> {
>   double a;
>   a =3D 0.3333;
>   printf( " a =3D %15.15f\n", a );
>   a *=3D 10;
>   printf( " a =3D %15.15f\n", a );
>   a *=3D 10;
>   printf( " a =3D %15.15f\n", a );
>   a *=3D 10;
>   printf( " a =3D %15.15f\n", a );
>   a *=3D 10;
>   printf( " a =3D %15.15f\n", a );
>   system("PAUSE");
>   return 0;
> }
> ********************************************
>
> I get this output:
>
> ********************************************
>  a =3D 0.333300000000000
>  a =3D 3.333000000000000
>  a =3D 33.329999999999998
>  a =3D 333.299999999999950
>  a =3D 3332.999999999999500
> ********************************************
>
> How to avoid this error?
> Thank in advance for any response.
>
>
> =3D=3D=3D=3D=3D
> +=3D+=3D+=3D+=3D+=3D+=3D+=3D+=3D+=3D+=3D+=3D+=3D+=3D+=3D+=3D+=3D+=3D+=3D+=
=3D+=3D+=3D+=3D+=3D+=3D+=3D+=3D+=3D+=3D+=3D+=3D
> Lu=EDs Filipe Delgado Br=E1s
> Eng.=BA Civil
> Porto - Portugal
> email: lf...@ya...
> http://www.fotopt.net/autor.asp?autor=3D2637
> +=3D+=3D+=3D+=3D+=3D+=3D+=3D+=3D+=3D+=3D+=3D+=3D+=3D+=3D+=3D+=3D+=3D+=3D+=
=3D+=3D+=3D+=3D+=3D+=3D+=3D+=3D+=3D+=3D+=3D+=3D
>
> __________________________________
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>
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>

Re: [Dev-C++] numerical error in a simple program

[<ten...@ne...>]

The binary representation for floating point numbers cannot be perfectly 
accurate, so that imprecissions. With double variables you get better 
precission that simple float.
But if you want more precission, then, as said by w.y., there shall be 
special libraries.

w.y. wrote:

>"Luís Brás" wrote:
>  
>
>> a = 0.333300000000000
>> a = 3.333000000000000
>> a = 33.329999999999998
>> a = 333.299999999999950
>> a = 3332.999999999999500
>>    
>>
>
>  
>
>>How to avoid this error?
>>    
>>
>
>You have to design your own floating point format type, or find a
>library that does it...
>If you need _exact_ FP calculations, the built in types can't do it.
>
>
>-------------------------------------------------------
>This sf.net email is sponsored by:ThinkGeek
>Welcome to geek heaven.
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>
>  
>

Re: [Dev-C++] COM

[w.y. <yok...@ve...>]

Winston Ewert wrote:
> 
> Is it possible to use COM interfaces from Mingw?  If so, can somebody point
> me in the correct direction?

I have used them through DirectX, so I think it should be possible
to use other COM interfaces.

Re: [Dev-C++] numerical error in a simple program

[w.y. <yok...@ve...>]

"Luís Brás" wrote:
> 
>  a = 0.333300000000000
>  a = 3.333000000000000
>  a = 33.329999999999998
>  a = 333.299999999999950
>  a = 3332.999999999999500

> How to avoid this error?

You have to design your own floating point format type, or find a
library that does it...
If you need _exact_ FP calculations, the built in types can't do it.

Re: [Dev-C++] numerical error in a simple program

[Luís B. <lf...@ya...>]

--- Neszt Tibor <ne...@ss...> wrote:
> Instead of:
> 
> >   printf( " a = %15.15f\n", a );
> 
> Try:
>     printf( " a = %15.10f\n", a );
> 
> :-)
> 
> Tibor
> 

It's not a question of output. Numerically the error is still there:

*********************************
printf( "(int)a = %d\n", (int)a);
*********************************
output -> 3332



=====
+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=
Luís Filipe Delgado Brás
Eng.º Civil
Porto - Portugal
email: lf...@ya...
http://www.fotopt.net/autor.asp?autor=2637
+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=

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Re: [Dev-C++] numerical error in a simple program

[Neszt T. <ne...@ss...>]

Instead of:

>   printf( " a = %15.15f\n", a );

Try:
    printf( " a = %15.10f\n", a );

:-)

Tibor

Re: [Dev-C++] numerical error in a simple program

[Neszt T. <ne...@ss...>]

> ********************************************
>  a = 0.333300000000000
>  a = 3.333000000000000
>  a = 33.329999999999998
>  a = 333.299999999999950
>  a = 3332.999999999999500
> ********************************************
> 
> How to avoid this error?

It is error? Hmm.. I guess, It is intelligence :-))))

Tibor

[Dev-C++] numerical error in a simple program

[Luís B. <lf...@ya...>]

When I try to compile this program:

********************************************
#include <stdio.h> // printf
#include <stdlib.h> // system

int main(int argc, char *argv[])
{
  double a;
  a = 0.3333;
  printf( " a = %15.15f\n", a );
  a *= 10;
  printf( " a = %15.15f\n", a );
  a *= 10;
  printf( " a = %15.15f\n", a );
  a *= 10;
  printf( " a = %15.15f\n", a );
  a *= 10;
  printf( " a = %15.15f\n", a );
  system("PAUSE");	
  return 0;
}
********************************************

I get this output:

********************************************
 a = 0.333300000000000
 a = 3.333000000000000
 a = 33.329999999999998
 a = 333.299999999999950
 a = 3332.999999999999500
********************************************

How to avoid this error?
Thank in advance for any response.


=====
+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=
Luís Filipe Delgado Brás
Eng.º Civil
Porto - Portugal
email: lf...@ya...
http://www.fotopt.net/autor.asp?autor=2637
+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=

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Re: [Dev-C++] I'm new at this so

[Kit <seo...@st...>]

Try this:
http://cplus.about.com/library/blcplustut.htm

Charles *Unknown* wrote:
> How do I read the tutorials?  I don't understand any of them and I 
> downloaded ALOT of tutorials
> 
> _________________________________________________________________
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> 
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> 

-
--
Kiti

RE: [Dev-C++] Bits Bytes megabytes help needed

[Ioannis V. <iv...@em...>]

> -----Original Message-----
> From: dev...@li... 
> [mailto:dev...@li...] On Behalf Of Zodiaq
> Sent: Tuesday, September 02, 2003 10:38 PM
> To: Dev...@li...
> Subject: Re: [Dev-C++] Bits Bytes megabytes help needed
> 
> 
> Hello Eric and all Dev-C++ users,
> 
> Tuesday, September 2, 2003, 9:03:03 PM, Eric wrote as follows:
> 
> EC> Bit bytes megabytes
> 
> EC> Can you tell me how to convert theses by hand?
> 
> First, and very important: if we are talking about binary (computer
> based) system we do not use k, M or G... these are used in physics,
> not in computers... only hard driver makers use these to cheat (yeah,
> I call it cheating!) customers... with computers use:
> 2^10 - Ki - kilo binary... so we have KiB (kibibytes) and Kib


Those Kibi-stuff are not recognised worldwide. The established stuff are 1
Kilobyte=1024 bytes and so on.






Ioannis Vranos
 
* Programming pages: http://www.noicys.freeurl.com
* Alternative URL 1: http://run.to/noicys
* Alternative URL 2: http://www.noicys.cjb.net

RE: [Dev-C++] Bits Bytes megabytes help needed

[Ioannis V. <iv...@em...>]

> -----Original Message-----
> From: dev...@li... 
> [mailto:dev...@li...] On Behalf 
> Of Eric Churches
> Sent: Tuesday, September 02, 2003 10:03 PM
> To: dev...@li...
> Subject: [Dev-C++] Bits Bytes megabytes help needed
> 
> 
> Bit bytes megabytes
> 
> Can you tell me how to convert theses by hand?
> 
>  How many kilobytes in a megabyte?
> 
> 1024 how would get this answer


1 KB=1024 bytes
1 MB=1024 KB
1 GB=1024 MB


HDD manufacturers usually cheat by using 1000 MB for a GB (and so on) but
all Oses tell the truth so far. :-)



> 
> 20 to the power of 2?  If this is right how do you work it out 
> or is there another way.



Computers store data in binary form so everything is in power of 2.



> 
> I know there is 8 bits to a byte


That's not required. In most systems it is though. To be portable check
CHAR_BIT in <limits.h> in C and numeric_limits<char>::digits in <limits> in
C++.






Ioannis Vranos
 
* Programming pages: http://www.noicys.freeurl.com
* Alternative URL 1: http://run.to/noicys
* Alternative URL 2: http://www.noicys.cjb.net

[Dev-C++] COM

[Winston E. <wet...@ho...>]

Is it possible to use COM interfaces from Mingw?  If so, can somebody point 
me in the correct direction?


Thanks, Winston Ewert

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Re: [Dev-C++] Bits Bytes megabytes help needed

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

Hello Eric and all Dev-C++ users,

Tuesday, September 2, 2003, 9:03:03 PM, Eric wrote as follows:

EC> Bit bytes megabytes

EC> Can you tell me how to convert theses by hand?

First, and very important: if we are talking about binary (computer
based) system we do not use k, M or G... these are used in physics,
not in computers... only hard driver makers use these to cheat (yeah,
I call it cheating!) customers... with computers use:
2^10 - Ki - kilo binary... so we have KiB (kibibytes) and Kib
(kibibytes)
2^20 - Mi - mega binary...
2^30 - Gi - giga binary...

EC>  How many kilobytes in a megabyte?

huh, lol...
there are 1024 Bytes in KiB
and there 1024 KiB in MiB
but
there are 8192 bits in KiB...

EC> 1024 how would get this answer

EC> 20 to the power of 2?  If this is right how do you work it out 
EC> or is there another way.

EC> I know there is 8 bits to a byte

EC> Can anyone help without using a calulator

it is not hard... just remember power of 2 till 1048576 bacuse you
will need it in many ocasions in study...
so if anyone asks you: 2^8 ? you say without a hesitation 256... and
so on - have phun...

and more about Kis and others:
http://physics.nist.gov/cuu/Units/binary.html

one off-topic:
I have a good connection to internet, 64KiB/s is more than enough for
me... but when I see what I waste of place these mails make it makes
me so angry! Have you people looked at space they take?? For example
mail I'm responding to is over 4KiB size, but text inside is only 500
bytes! remaing 3.5 is trash!!! trash! trash! lots of "received from",
some anti-spam feature info from SF and then some list infos - which
NOBODY looks at as recently few people shown us trying unsubscribe by
sending info to list! trash... I'm programming in WinAPI using mingw
to get smallest possible programs, and when I see this waste of space
in these mails... ehhh... where is my calming-down pill!?

-- 
regards, Zodiaq

[Dev-C++] Bits Bytes megabytes help needed

[Eric C. <ec...@ih...>]

Bit bytes megabytes

Can you tell me how to convert theses by hand?

 How many kilobytes in a megabyte?

1024 how would get this answer

20 to the power of 2?  If this is right how do you work it out 
or is there another way.

I know there is 8 bits to a byte

Can anyone help without using a calulator

Thanks Eric

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