dev-cpp-users Mailing List for Dev-C++

Does anyone know why the following code for writing
class data to a file does not work? Is there something
wrong with the way the book wrote the code???

-Book example prog for writing/reading from binary
file
-------------------------------------------------------

 #include <fstream.h>
#include <stdlib.h>

class Animal
{
public:
	Animal(int weight, long
days):itsWeight(weight),itsNumberDaysAlive(days){}
	~Animal(){}

	int GetWeight()const { return itsWeight; }
	void SetWeight(int weight) { itsWeight = weight; }

	long GetDaysAlive()const { return 
itsNumberDaysAlive; }
	void SetDaysAlive(long days) { itsNumberDaysAlive =
days; }

private:
	int itsWeight;
	long itsNumberDaysAlive;
};

int main(int argc, char *argv[])   // returns 1 on
error
{
	if (argc != 2)
	{
		cout << "Usage: " << argv[0] << " <filename>" <<
endl;
		return(1);
	}

	ofstream fout(argv[1],ios::binary);
	if (!fout.good())
	{
		cout << "Unable to open " << argv[1] << " for
writing.\n";
		return(1);
	}

	Animal Bear(50,100);
	fout.write((char *)&Bear,sizeof(Bear));
	fout.close();

	ifstream fin(argv[1],ios::binary);
	if (!fin.good())
	{
		cout << "Unable to open " << argv[1] << " for
reading.\n";
		return(1);
	}

	Animal BearTwo(1,1);

	cout << "BearTwo weight: " << BearTwo.GetWeight() <<
endl;
	cout << "BearTwo days: " << BearTwo.GetDaysAlive() <<
endl;

	fin.read((char *)&BearTwo, sizeof(BearTwo));

	cout << "BearTwo weight: " << BearTwo.GetWeight() <<
endl;
	cout << "BearTwo days: " << BearTwo.GetDaysAlive() <<
endl;
	fin.close();
    system("PAUSE");
	return 0;
}

------------------------------------------------------
I would appreciate any help, I would like to get this
working so I can use it in one of my programs....


=====
Julio

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http://www.gamedev.net has links to other websites and
tutorials on this; look for stuff on Win32.


-----ORIGINAL MESSAGE------------------------------
FROM: mike shoupDATE: 12/03/2001 12:48:39SUBJECT: 
[Dev-C++] Windows apps? Hello. I just finished
learning the C programming language from a book. The 
book did not include any idea as to how to write
Windows programs, just the 
little text based ones.  I am curious as to if someone
could point me to a 
good book or online tutorial that describes how to do
this.

Thanks

Mike S. | Freak901010 | <EMAIL: PROTECTED>


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=====
Julio

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André -

> I'am having some trouble with the portable solution Charles sent in
previous message. It workeb fine until I included one more printf() line
before it, like the following example. I had to replace it with the
system(pause) line.
...
 printf("x value is: %d\n",som);
 printf("Press ENTER to continue...");
 fflush(stdout);
 getchar();

> Note that I use stdio.h instead of cstdio, is it because of that?

Probably not.

Comment out the first printf.  Does the program work now?  If it does, look
in the first printf statement for a problem.  What errors are the compiler
or the linker giving you?   Did you define som?

I tried this program:

#include <cstdio>
int main(int argc, char *argv[]){
    int som=100;
    printf("x value is: %d\n",som);
    printf("Press ENTER to continue...");
    fflush(stdout);
    getchar();
    return 0;
}

and received this output:

x value is: 100
Press ENTER to continue...


By the way, #include <stdio.h> also works.

Chuck

Hello. I just finished learning the C programming language from a book. The 
book did not include any idea as to how to write Windows programs, just the 
little text based ones.  I am curious as to if someone could point me to a 
good book or online tutorial that describes how to do this.

Thanks

Mike S. | Freak901010 | fre...@ps...


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********************************************
Perhaps it is better if you replace the line:

fflush(stdout);

by

fflush(stdin);

good luck.
****************************************

I hate to be a neusance, but does anyone understand why this might be 
happening ?  Is it possibly a bug, or am I using it incorrectly ?

Mike


>From: "Mike McCue" <mc...@ms...>
>To: dev...@li...
>Subject: [Dev-C++] not passing linking options when compiling dll ?
>Date: Fri, 30 Nov 2001 12:19:41 -0500
>
>I have finally accomplished compiling a dll and a project that uses it,
>thanks to those that helped!
>
>My only problem now is that I cannot use iostream's cout within the DLL, I
>get undefined reference errors... I've been working on this in the mingw
>mailing list, and came across an interesting discovery today...
>
>I'm trying to include the libstdc++.a library into the dll project, but its
>not getting passed on the command line at link time.  Here is the compile
>and Link command lines :
>
>----------
>Compiling files :
>C:\OPENGL\DEV-C_~1\BIN\gcc -c -DBUILDING_DLL=1 -I. "c:\opengl\using a
>dll\printdll\print.cpp"  -s -mwindows   -IC:\OPENGL\DEV-C_~1\INCLUDE\
>-IC:\OPENGL\DEV-C_~1\INCLUDE\G__~1 -IC:\OPENGL\DEV-C_~1\INCLUDE\
>-LC:\OPENGL\DEV-C_~1\LIB\ -BC:\OPENGL\DEV-C_~1\BIN\
>Linking files :
>C:\OPENGL\DEV-C_~1\BIN\dllwrap --export-all --output-def
>C:\OPENGL\USINGA~1\PRINTDLL\dll.def --implib
>"C:\OPENGL\USINGA~1\PRINTDLL\libPrintdll.a" -o
>c:\opengl\usinga~1\printdll\Printdll.dll "c:\opengl\using a
>dll\printdll\print.o"
>----------
>
>If, in project options, I uncheck the box that says "Create a DLL" then I
>will see "-lstdc++" on the link command line, but not if the "Create a DLL"
>option is checked.  Is this a bug within Dev-C++ ?  I tried running the
>linking command, with all the options, from a dos window but the command is
>too long.
>
>Thanks for any help,
>Mike
>
>
>_________________________________________________________________
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Hi!
I'm new with the C language programming.
I'am having some trouble with the portable solution Charles sent in
previous message. It workeb fine until I included one more printf() line
before it, like the following example. I had to replace it with the
system(pause) line.

...
 printf("x value is: %d\n",som);
 printf("Press ENTER to continue...");
 fflush(stdout);
 getchar();


Note that I use stdio.h instead of cstdio, is it because of that?


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http://www.exempligratia.net

What exactly do you mean? Do you mean like displaying a bitmap to the
screen? Or are you talking about the icon for your .exe?

bana

----- Original Message -----
From: "http//:angelfire.com/dc/85 Sale's" <bc...@ms...>
To: <dev...@li...>
Sent: Sunday, December 02, 2001 7:03 PM
Subject: [Dev-C++] [Dev-C++]Pictures??HELP!!


> Hi,
> I need help with puttin pictures in a Program I'm making?Could you send me
> an example.I went to winprog.com but that wound'nt work.Please help me!
> Thank You in advance!
> Please go to my website http://angelfire.com/dc/85
> http://geocities.com/bc8j
>
>
> _________________________________________________________________
> Get your FREE download of MSN Explorer at http://explorer.msn.com/intl.asp
>
>
> _______________________________________________
> Dev-cpp-users mailing list
> Dev...@li...
> https://lists.sourceforge.net/lists/listinfo/dev-cpp-users

Hi,
I need help with puttin pictures in a Program I'm making?Could you send me 
an example.I went to winprog.com but that wound'nt work.Please help me!
Thank You in advance!
Please go to my website http://angelfire.com/dc/85
http://geocities.com/bc8j


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