dev-cpp-users Mailing List for Dev-C++ (Page 750)

i keep on getting this error message 
C:\DEV-C_~1\BIN\ld.exe: cannot open crt2.o: No such file or directory

I am a very beginner of programming at all. I decided for learnig c++  =
with dev-c++.
Now I have the following problem: compiling sources including "conio.h" =
always leads to the error messages:
=20
warning: `__cdecl__' attribute directive ignored
in line 139 from conio.h which is:
- extern int  _RTLENTRY _EXPDATA  _wscroll;

Does somebody know what is going wrong here ?
=20
Thanks Chris


=20

I here by confirm to to recieve info from the mailling list
Carbonn

> I'm trying to compile a direct x program and I keep
> getting the following error message
>   c:\my documents\main.o(.text+0x1d0):main.cpp:
> undefined reference to `DirectDrawCreateEx@16'
>
> Does anyone knows how can I stop getting this error. I
> have the following option "-fvtable-thunks" set, as
> well as linking to libraries ddraw & dxguid. Also the
> include files are set. Is there anything else I need
> to set.

Maybe you are linking to an old version of ddraw ? I think you need at
least DX7 to have the function 'DirectDrawCreateEx', before you only
have 'DirectDrawCreate'. I remember there was a DirectX 7.0 package for
dev-c++ available from the dev-c++ website, if you use it there
shouldn't be any problems with compiling.

Elias Pschernig

It is a .zip file so you need to unzip it. If you have Winzip installed on
your computer you should just be able to double click on it. Then extract
the files to a temporary directory (maybe c:\windows\temp ). Once extracted,
go to that directory, and open the setup.exe file.

If you don't have winzip you can get it here:  http://www.winzip.com

Once you've installed it, you can delete the extracted setup files.


----- Original Message -----
From: zhusain
To: dev...@li...
Sent: Friday, December 08, 2000 11:25 PM
Subject: [Dev-C++] Devcpp4 - Installation


This may look preliminary.However I need help to get the programme running
after I have down loaded the programme on my hard disk.

Thanks

This may look preliminary.However I need help to get the programme =
running after I have down loaded the programme on my hard disk.

Thanks

I'm trying to compile a direct x program and I keep
getting the following error message
  c:\my documents\main.o(.text+0x1d0):main.cpp:
undefined reference to `DirectDrawCreateEx@16'

Does anyone knows how can I stop getting this error. I
have the following option "-fvtable-thunks" set, as
well as linking to libraries ddraw & dxguid. Also the
include files are set. Is there anything else I need
to set.

Thanks
Eliud


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Your using strstream the wrong way, in the code below I'm using ostrstream
(output string stream) to be able to use the << operators.

#include <string>
#include <iostream>
#include <strstream>
using namespace std;

int main(int argc, char *argv[])
{
  string MyString;
  char MyChar[200];

  ((MyString += "John has ") += "4") += " apples!";

  cout << MyString << endl;

  // Wrap the char in an ostratream to enable the use of '<<' operator the
same as cout etc.
  ostrstream(MyChar, sizeof(MyChar)) << "John has " << 10 << " apples!" <<
ends;

  MyString = MyChar;

  cout << MyString << endl;

  return 0;
}

Regards,

James.


-----Original Message-----
From: Chad Simmons [mailto:ho...@ho...]
Sent: Thursday, December 07, 2000 4:58 PM
To: dev...@li...
Subject: RE: [Dev-C++] string-version of '+'


Sorry, I need to clarify.. It's the

  MyString = MyStream.str();

line that the compiler bombs on.

This other line with the parentheses is ok.

  ((MyString += "John has ") += "4") += " apples!";

Chad Simmons

>From: "Chad Simmons" <ho...@ho...>
>Reply-To: dev...@li...
>To: dev...@li...
>Subject: RE: [Dev-C++] string-version of '+'
>Date: Thu, 07 Dec 2000 08:44:28 -0800
>
>Interesting.. I decided to actually test the code I was promoting, and I 
>found a problem with the compiler.. It seems to bomb out on this bit of 
>code..
>
>#include <string>
>#include <iostream>
>#include <strstream>
>using namespace std;
>
>int main(int argc, char *argv[])
>{
>  string MyString;
>  strstream MyStream;
>
>  ((MyString += "John has ") += "4") += " apples!";
>
>  cout << MyString << endl;
>
>  MyStream << "John has " << 10 << " apples!";
>
>  MyString = MyStream.str();
>
>  cout << MyString << endl;
>
>  return 0;
>}

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You got me there... :)
It is not part of the ANSI spec.
Another way to do it might be to use the sprintf function (www.cplusplus.com/ref/cstdio/sprintf.html)

-----------------
From: "Ioannis Vranos" <no...@ya...>
I don't think that there is any itoa() function in C standard library.


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> -----Original Message-----
> From: dev...@li... 
> [mailto:dev...@li...]On Behalf Of 
> Gregor Peter
> Sent: Thursday, December 07, 2000 1:10 PM
> To: dev...@li...; exc...@sp...
> Subject: Re: [Dev-C++] RE: Int value to string
> 
> Are there any online documentation about stdlib.h and Co where I 
> can look for myself?
> (For a function to convert an array of char to sting, for example?) :-)

char array[]="test";
string s=array;

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Sorry, I need to clarify.. It's the

  MyString = MyStream.str();

line that the compiler bombs on.

This other line with the parentheses is ok.

  ((MyString += "John has ") += "4") += " apples!";

Chad Simmons

>From: "Chad Simmons" <ho...@ho...>
>Reply-To: dev...@li...
>To: dev...@li...
>Subject: RE: [Dev-C++] string-version of '+'
>Date: Thu, 07 Dec 2000 08:44:28 -0800
>
>Interesting.. I decided to actually test the code I was promoting, and I 
>found a problem with the compiler.. It seems to bomb out on this bit of 
>code..
>
>#include <string>
>#include <iostream>
>#include <strstream>
>using namespace std;
>
>int main(int argc, char *argv[])
>{
>  string MyString;
>  strstream MyStream;
>
>  ((MyString += "John has ") += "4") += " apples!";
>
>  cout << MyString << endl;
>
>  MyStream << "John has " << 10 << " apples!";
>
>  MyString = MyStream.str();
>
>  cout << MyString << endl;
>
>  return 0;
>}

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Interesting.. I decided to actually test the code I was promoting, and I 
found a problem with the compiler.. It seems to bomb out on this bit of 
code..

#include <string>
#include <iostream>
#include <strstream>
using namespace std;

int main(int argc, char *argv[])
{
  string MyString;
  strstream MyStream;

  ((MyString += "John has ") += "4") += " apples!";

  cout << MyString << endl;

  MyStream << "John has " << 10 << " apples!";

  MyString = MyStream.str();

  cout << MyString << endl;

  return 0;
}

But I can compile the exact same code using the GNU G++ compiler without any 
errors or warnings or crashes.

So this most likely explains Gregor's problems.. But the fault is with the 
compiler, as the Standard C++ library dictates this functionality.

Chad Simmons
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Or you can do it with parentheses..

string myString;

((myString += "John has ") += myApples ) += " apples";

But this sort of thing should really be done with a strstream. Perhaps if 
Gregor could show more specifically what his code looks like I could explain 
how he's using the strstream wrong.

Chad Simmons

>From: James Gordon <Jam...@Cl...>
>Reply-To: dev...@li...
>To: "'dev...@li...'"  
><dev...@li...>
>Subject: RE: [Dev-C++] string-version of '+'
>Date: Thu, 7 Dec 2000 15:34:59 -0000
>
>this might not be the best way but I've always had to split the code into 
>two statements.
>
>Change this:
>myString = "John has " + myApples + " apples";
>
>To this:
>myString = "John has " + myApples;
>myString += " apples";
>

[Snip]

>
>James.
>
>
>-----Original Message-----
>From: Gregor Peter [mailto:Gre...@dl...]
>Sent: Thursday, December 07, 2000 2:58 PM
>To: exc...@sp...; dev...@li...
>Subject: [Dev-C++] string-version of '+'
>
>
>You're right!
>
>I tried it before in a direkt manner which doesn't work :-(
>
>string myString;
>char myApples[20];
>int    myInt;
>
>itoa( myInt, myApples, 10);
>myString = "John has " + myApples + " apples";
>
>I get following error message:
>     invalid operands `const char[28]' and `char[20]' to binary `operator 
>+'

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this might not be the best way but I've always had to split the code into
two statements.

Change this:
myString = "John has " + myApples + " apples";

To this:
myString = "John has " + myApples;
myString += " apples";

This is because it works from right to left.
In your code you are trying to assign the string " apples" to the char[20]
and the result from that to the string "John has " and then that lot to the
std::string.

I think that's correct...

Regards,

James.


-----Original Message-----
From: Gregor Peter [mailto:Gre...@dl...]
Sent: Thursday, December 07, 2000 2:58 PM
To: exc...@sp...; dev...@li...
Subject: [Dev-C++] string-version of '+'


You're right!

I tried it before in a direkt manner which doesn't work :-(

string myString;
char myApples[20];
int    myInt;

itoa( myInt, myApples, 10);
myString = "John has " + myApples + " apples";

I get following error message:
    invalid operands `const char[28]' and `char[20]' to binary `operator +'

How do I enshure to use the string-version of '+' instead of  the integer?

Gregor


> string my1String("John has");
> string my2String("apples!");
> char myApples[20] ;
> int   myInt = 6;
>
> itoa(myInt, myApples, 10);
>
> my1String = my1String + myApples + my2String ;
>
> That is you can put all of the strings into one, my1String.

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You're right!

I tried it before in a direkt manner which doesn't work :-(

string myString;
char myApples[20];
int    myInt;

itoa( myInt, myApples, 10);
myString = "John has " + myApples + " apples";

I get following error message:
    invalid operands `const char[28]' and `char[20]' to binary `operator +'

How do I enshure to use the string-version of '+' instead of  the integer?

Gregor


> string my1String("John has");
> string my2String("apples!");
> char myApples[20] ;
> int   myInt = 6;
>
> itoa(myInt, myApples, 10);
>
> my1String = my1String + myApples + my2String ;
>
> That is you can put all of the strings into one, my1String.

Do you mean a string as in std::string or a string as in char[] or char*?

The function to do the latter is c_str().

Regards,

James.


-----Original Message-----
From: Gregor Peter [mailto:Gre...@dl...]
Sent: Thursday, December 07, 2000 1:27 PM
To: dev...@li...; ho...@ho...
Subject: Re: [Dev-C++] int to string


OK I got the library and tried it out, but ist doesn't work.

I need to feed needsStringFunc( string name )
so I tried
    string name = buffer.str()
which causes my Programm to crash :-(

So the str() method doesn't return the content of  buffer as a string?!?

Gregor

Chad Simmons wrote:

> How about this instead..
>
> string my1String = "John";
> string my2String = "apples";
> int    myInt     = 6;
> strstream buffer;
>
> buffer << my1String << " has " << myInt << " "<< my2String << "!" << endl;
>
> cout << buffer.str();
>
> // Output = John has 6 apples!
>
> Chad Simmons
>
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OK I got the library and tried it out, but ist doesn't work.

I need to feed needsStringFunc( string name )
so I tried
    string name = buffer.str()
which causes my Programm to crash :-(

So the str() method doesn't return the content of  buffer as a string?!?

Gregor

Chad Simmons wrote:

> How about this instead..
>
> string my1String = "John";
> string my2String = "apples";
> int    myInt     = 6;
> strstream buffer;
>
> buffer << my1String << " has " << myInt << " "<< my2String << "!" << endl;
>
> cout << buffer.str();
>
> // Output = John has 6 apples!
>
> Chad Simmons
> _____________________________________________________________________________________
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strstream is part of the C++ IO Streams.

I believe it's in strstream. It's in dev-C++\include\G++, all it does it
include strstream.h.

Regards,

James.


-----Original Message-----
From: Gregor Peter [mailto:Gre...@dl...]
Sent: Thursday, December 07, 2000 11:20 AM
To: dev...@li...; ho...@ho...
Subject: Re: [Dev-C++] int to string


Fine, but where to get strstream from?
It isn't in iostream.h am I right?

Are there any online documentation about stdlib.h, string.h & Co
where I can browse for myself?

Gregor

Chad Simmons wrote:

> >How to convert, cast, transform, whatever a int value to a string?
> >include <string.h>
> >string my1String = "John has";  string my2String = "apples!"; int
myInt = 6;
> >my1stString = my1stString + UNKNOWN_FUNC(myInt) + my2ndString;
> >As you guessed I'd like to get: "John has 6 apples!"
>
> How about this instead..
>
> string my1String = "John";
> string my2String = "apples";
> int    myInt     = 6;
> strstream buffer;
>
> buffer << my1String << " has " << myInt << " "<< my2String << "!" << endl;
> cout << buffer.str();
> // Output = John has 6 apples!

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Fax: +44 (0) 1458 447547 

It's in stdlib.h as 'char* itoa (int nValue, char* sz, int nRadix);'

Regards,

James.


-----Original Message-----
From: Ioannis Vranos [mailto:no...@ya...]
Sent: Thursday, December 07, 2000 11:15 AM
To: dev...@li...
Subject: RE: [Dev-C++] RE: Int value to string


I don't think that there is any itoa() function in C standard library.


> -----Original Message-----
> From: dev...@li...
> [mailto:dev...@li...]On Behalf Of
> exc...@sp...
> Sent: Thursday, December 07, 2000 9:15 AM
> To: dev...@li...
> Subject: [Dev-C++] RE: Int value to string
>
>
> >How to convert, cast, transform, whatever a >int value to a string?
> First, include stdlib.h.
> Then add another string to hold the myInt value:
>
>   char myApples[20];
>
> Then all you have to do is insert this line of code:
>
>   itoa(myInt, myApples, 10);
>
> This line of code takes an int (myInt), and converts it to a
> string (myAples), with base 10. If you want the number in hex,
> write 16. If you want it in binary, write 2.
>
> /Orjan
>
>
> _________________________________________s_p_r_a_y_
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Fine, but where to get strstream from?
It isn't in iostream.h am I right?

Are there any online documentation about stdlib.h, string.h & Co
where I can browse for myself?

Gregor

Chad Simmons wrote:

> >How to convert, cast, transform, whatever a int value to a string?
> >include <string.h>
> >string my1String = "John has";  string my2String = "apples!"; int    myInt = 6;
> >my1stString = my1stString + UNKNOWN_FUNC(myInt) + my2ndString;
> >As you guessed I'd like to get: "John has 6 apples!"
>
> How about this instead..
>
> string my1String = "John";
> string my2String = "apples";
> int    myInt     = 6;
> strstream buffer;
>
> buffer << my1String << " has " << myInt << " "<< my2String << "!" << endl;
> cout << buffer.str();
> // Output = John has 6 apples!

I don't think that there is any itoa() function in C standard library.


> -----Original Message-----
> From: dev...@li...
> [mailto:dev...@li...]On Behalf Of
> exc...@sp...
> Sent: Thursday, December 07, 2000 9:15 AM
> To: dev...@li...
> Subject: [Dev-C++] RE: Int value to string
>
>
> >How to convert, cast, transform, whatever a >int value to a string?
> First, include stdlib.h.
> Then add another string to hold the myInt value:
>
>   char myApples[20];
>
> Then all you have to do is insert this line of code:
>
>   itoa(myInt, myApples, 10);
>
> This line of code takes an int (myInt), and converts it to a
> string (myAples), with base 10. If you want the number in hex,
> write 16. If you want it in binary, write 2.
>
> /Orjan
>
>
> _________________________________________s_p_r_a_y_
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>


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My guess is that you are not using the address to operator &.

E.g.. int number;
        scanf("%d", &number);

> -----Original Message-----
> From: dev...@li... 
> [mailto:dev...@li...]On Behalf Of 
> jw...@cs...
> Sent: Thursday, December 07, 2000 5:40 AM
> To: dev...@li...
> Subject: [Dev-C++] Big problems with version 4.01....
> 
> 
> 
> I'm a beginning programmer and use Dev-C++ for my C 
> programming. Anyway, ever since installing version 4.01 I've 
> noticed some very odd things that i didn't notice in 4.0. For 
> example, whenever i try to use the fscanf function to read a floating 
> point number into a file, the program compiles okay but crashes on 
> both of my computers (Win2000 and Win98). Is it just me or does 
> 4.01 have some serious bugs in it? Another thing that is really 
> strange is when a try to use to scanf function to scan a single 
> character into a data structure. The program simply crashes. I just 
> wanted to know what was going on. 
> 
> 								Thanx.
> _______________________________________________
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> 

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Looks pretty good but what I need is a string not char[10]
to feed needsStringFunc( string name)

Are there any online documentation about stdlib.h and Co where I can look for myself?
(For a function to convert an array of char to sting, for example?) :-)

Gregor

exc...@sp... wrote:

> >How to convert, cast, transform, whatever a int value to a string?
> First, include stdlib.h.
> Then add another string to hold the myInt value:
>     char myApples[20];
> Then all you have to do is insert this line of code:
>     itoa(myInt, myApples, 10);
> This line of code takes an int (myInt), and converts it to a string (myAples), with base 10. If you want the number in hex, write 16. If you want it in binary, write 2.

>How to convert, cast, transform, whatever a >int value to a string?
First, include stdlib.h.
Then add another string to hold the myInt value:

  char myApples[20];

Then all you have to do is insert this line of code:

  itoa(myInt, myApples, 10);

This line of code takes an int (myInt), and converts it to a string (myAples), with base 10. If you want the number in hex, write 16. If you want it in binary, write 2.

/Orjan


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I'm a beginning programmer and use Dev-C++ for my C 
programming. Anyway, ever since installing version 4.01 I've 
noticed some very odd things that i didn't notice in 4.0. For 
example, whenever i try to use the fscanf function to read a floating 
point number into a file, the program compiles okay but crashes on 
both of my computers (Win2000 and Win98). Is it just me or does 
4.01 have some serious bugs in it? Another thing that is really 
strange is when a try to use to scanf function to scan a single 
character into a data structure. The program simply crashes. I just 
wanted to know what was going on. 

								Thanx.