41 replies to this topic

[cignox1]

Ok. The funny thing is that I don't even get the stdout.txt file. Uhm... I will use some font library (I would have to use it however, soon or later).
Thank you again!

[Easca]

Quote:

Original post by cignox1 Ok. The funny thing is that I don't even get the stdout.txt file. Uhm... I will use some font library (I would have to use it however, soon or later). Thank you again!

Did you try using:

freopen( "stdout.txt", "wt", stdout );
freopen( "stderr.txt", "wt", stderr );

[Rhaal]

Quote:

Original post by cignox1 Ok. The funny thing is that I don't even get the stdout.txt file. Uhm... I will use some font library (I would have to use it however, soon or later). Thank you again!

Are you aware that the file deletes itself after your program ends? To make anything of it you'll most likely run your program in windowed mode and look at the text file during debugging/testing.

Edit: If nothing is written to it :)

[Edited by - Rhaal on February 10, 2005 5:43:36 PM]

[Drew_Benton]

Quote:

Original post by Rhaal Quote: Original post by cignox1 Ok. The funny thing is that I don't even get the stdout.txt file. Uhm... I will use some font library (I would have to use it however, soon or later). Thank you again! Are you aware that the file deletes itself after your program ends? To make anything of it you'll most likely run your program in windowed mode and look at the text file during debugging/testing.

It should only do that when no text is sent there. If the file contains text, it is left intact.

[cignox1]

Quote:

freopen( "stdout.txt", "wt", stdout ); freopen( "stderr.txt", "wt", stderr );

Uh, I thought that it would have been opened from the program without specific instructions...

[Drew_Benton]

Quote:

Original post by cignox1 Quote: freopen( "stdout.txt", "wt", stdout ); freopen( "stderr.txt", "wt", stderr ); Uh, I thought that it would have been opened from the program without specific instructions...

No, your right. That is what SDL does auto. One last thing to try before I say throw in the towel. happybara's first post mentioned this, but maybe it was the use of the parameters that made it fail. Instead try using:

freopen( "CON", "w", stdout ); 

As you can see, there is no 't'. I got that idea from this MSDN Article. If that does not solve your problems, well then I'm sorry, I guess there is nothing you can really do. Best of luck!

- Drew

[cignox1]

Thank you again... but guess what? It doesn't work! I always hated console interfaces, I never liked to use them, and I always had to work with them... once that I need a simle output on a console, there is no way to make it work!
Allright, I will solve this problem in the future. First I have to being able to invert a matrix, but I already opened a topic about that.

[Arenth]

This might seem sort of obvious but use the freopen( "CON", "w", stdout ); call after sdl_init(); since SDL_init(); is the call that calls
freopens ("CON",w/e,"stdout.txt");.. It worked awesome for me....

[Madster]

added to the SDL FAQ since i see it a lot

http://www.libsdl.org/cgi/docwiki.cgi/FAQ_20Console

worked for you guys? AFTER SDL_Init?

[Drew_Benton]

Quote:

Original post by Madster added to the SDL FAQ since i see it a lot http://www.libsdl.org/cgi/docwiki.cgi/FAQ_20Console worked for you guys? AFTER SDL_Init?

It does not matter to me really since I am not a Dev-CPP user, but it did not work for me. I think it may be of the DevPak that I am using. I will try updating my SDL from a non-3rd party source.

#include <SDL/SDL.h>
#include <cstdio>
#include <cstdlib>
#include <iostream>

using namespace std;

/* The screen surface */
SDL_Surface *screen = NULL;

int main(int argc, char *argv[] )
{
    char *msg;
    int done;

    // Initialize SDL //
    if (SDL_Init (SDL_INIT_EVERYTHING) < 0)
    {
        sprintf (msg, "Couldn't initialize SDL: %s\n", SDL_GetError ());
        free (msg);
        exit (1);
    }
    atexit (SDL_Quit);
    
    // Set 640x480 16-bits video mode //
    screen = SDL_SetVideoMode (640, 480, 32, SDL_SWSURFACE | SDL_DOUBLEBUF);
    if (screen == NULL)
    {
        sprintf (msg, "Couldn't set 640x480x16 video mode: %s\n",
          SDL_GetError ());
        free (msg);
        exit (2);
    }

    freopen( "stdout.txt", "w", stdout );
    freopen( "stderr.txt", "w", stderr );
    
    cout << "Test" << endl;
    printf("Test");
    
    done = 0;
    while (!done)
    {
        SDL_Event event;

        // Check for events //
        while (SDL_PollEvent (&event))
        {
            switch (event.type)
            {
            case SDL_KEYDOWN:
                 if ( event.key.keysym.sym == SDLK_ESCAPE ) { done = 1; }
                 done = 1;
                break;
            case SDL_QUIT:
                done = 1;
                break;
            default:
                break;
            }
        }
    }

    return 0;
}

[edit] Yea it still doesn't work. Once I add SDL to a new project, the project stops working correctly. I do not know why this is happening. I will try one more thing though.

I even tried a reinstall of Dev, then I tried 1.2.7 first, then 1.2.8 and still couldn't get it to work. Sheesh what's going on. I guess it has to be something we are doing if it works for you guys fine.

[Edited by - Drew_Benton on February 13, 2005 11:00:05 PM]

[Easca]

Quote:

Original post by Arenth This might seem sort of obvious but use the freopen( "CON", "w", stdout ); call after sdl_init(); since SDL_init(); is the call that calls freopens ("CON",w/e,"stdout.txt");.. It worked awesome for me....

Is that using mingw/dev-cpp?

[happybara]

It seems that the freopen method works but you have to call the IMG_Load function at least once...

A working example

#include <iostream>

#include <SDL/SDL.h>
#include <SDL/SDL_opengl.h>
#include <SDL/SDL_image.h>

using namespace std;
  SDL_Surface *screen;
  
int init_sdl(){ 

    freopen( "CON", "w", stdout );

    SDL_Init(SDL_INIT_VIDEO|SDL_INIT_AUDIO);

int  videoflags= SDL_HWSURFACE|SDL_DOUBLEBUF|SDL_OPENGL|SDL_ASYNCBLIT;
   screen = SDL_SetVideoMode(300, 300 , 32, videoflags);
	glViewport( 0, 0,300, 300 );
};


int main_loop(){
   SDL_Event event; 
   Uint8 *keystate;
   int  done=0;
    
   while(!done)

   {
   	cout<<"1"<<endl;
      glClearColor (0.7f, 0.9f, 0.9f, 1.0f);
      glClear (GL_COLOR_BUFFER_BIT |  GL_DEPTH_BUFFER_BIT);
       SDL_GL_SwapBuffers( );
          keystate = SDL_GetKeyState(NULL);  
          if ( keystate[SDLK_ESCAPE] ) {done=1;}
      while ( SDL_PollEvent(&event) )
      {
         if ( event.type == SDL_QUIT )  {  done = 1;  }
     } //while
  } //while
  return 0;
}

int dummy()
{
        SDL_Surface *img = IMG_Load("ab.bmp");
};    

int main(int argc, char *argv[])
{
  
    init_sdl();
    main_loop();
	
  return 0;
}

compiled as a 'win32 console' application
linker parameters
-lmingw32
-lopengl32
-lSDLmain
-lSDL
-lSDL_Image
-s
note that the dummy() function is not called.

Can anyone confirm that it works ?

[Easca]

That doesn't work for myself. :-(

[happybara]

I've just installed the newest version of SDL libraries and my previous code stopped working :/. But the following one does. Can you give it a try ?

#include <iostream>
#include <fstream>
#include <SDL/SDL.h>
#include <SDL/SDL_opengl.h>


using namespace std;
  SDL_Surface *screen;
  ofstream ctt("CON");
  
int init_sdl(){ 
    SDL_Init(SDL_INIT_VIDEO|SDL_INIT_AUDIO);
    freopen( "CON", "w", stdout );
    freopen( "con", "w", stderr );
    screen = SDL_SetVideoMode(300, 300 , 32, SDL_HWSURFACE|SDL_DOUBLEBUF|SDL_OPENGL|SDL_ASYNCBLIT);
    glViewport( 0, 0,300, 300 );
    ctt.close();	
};


int main_loop(){
   SDL_Event event; 
   Uint8 *keystate;
   int  done=0;
    
   while(!done)

   {
   	cout<<"cout"<<endl;
   	cerr<<"cerr"<<endl;
      glClearColor (0.7f, 0.9f, 0.9f, 1.0f);
      glClear (GL_COLOR_BUFFER_BIT |  GL_DEPTH_BUFFER_BIT);
       SDL_GL_SwapBuffers( );
          keystate = SDL_GetKeyState(NULL);  
          if ( keystate[SDLK_ESCAPE] ) {done=1;}
      while ( SDL_PollEvent(&event) )
      {
         if ( event.type == SDL_QUIT )  {  done = 1;  }
     } //while
  } //while
  return 0;
}

  

int main(int argc, char *argv[])
{
  
    init_sdl();
    main_loop();
	
  return 0;
}

[Easca]

That works for myself using [dev-cpp 4.9.9.1] and [SDL 1.2.4].


edit: C source-code

#include <SDL/SDL.h>
#include <stdio.h>

SDL_Surface *screen;
FILE * ctt = fopen("CON", "w" );
  
int init_sdl(){ 
    SDL_Init( SDL_INIT_VIDEO );
    freopen( "CON", "w", stdout );
    freopen( "con", "w", stderr );
    screen = SDL_SetVideoMode(300, 300 , 32, SDL_HWSURFACE|SDL_DOUBLEBUF );
    fclose( ctt );	
};


int main_loop(){
	SDL_Event event; 
	Uint8 *keystate;
	int  done=0;

	while(!done){
		   
		fprintf( stdout, "stdout\n" );
		fprintf( stderr, "stderr\n" );

		keystate = SDL_GetKeyState(NULL);  
		if ( keystate[SDLK_ESCAPE] ){
			done = 1;
		}
		while ( SDL_PollEvent(&event) ){
			if ( event.type == SDL_QUIT ){
				done = 1;
			}
		} //while
	} //while
	return 0;
}

  

int main( int argc, char *argv[] ){

	init_sdl();
	main_loop();

	return 0;
}

Linker options: -lmingw32 -lSDLmain -lSDL -liberty -s

[Edited by - Easca on February 14, 2005 9:19:32 AM]

[Drew_Benton]

Quote:

Original post by happybara I've just installed the newest version of SDL libraries and my previous code stopped working :/. But the following one does. Can you give it a try ? *** Source Snippet Removed ***

That works for me too! As well as the C version Easca has put as well! I've figured out what does the trick, but it's not something I can understand. I did not use the same linker line, just the code.

Those two lines:

FILE * ctt = fopen("CON", "w" );
fclose( ctt );

Are what made it work for me. I tried removing them and the program did not work as has been happening all along. Thanks to you two for posting that! Now my Dev-CPP works at least in console mode. This is something I will have to take a look into to see why this is a problem on Dev-CPP and not in Windows. Much appreciations for figuring this one out.

- Drew

[Easca]

OK from a quick scan through some documents ( C++ reference: cstdio: freopen:, MSDN and the UNIX manual page for freopen) I noted this little snippet:

Quote:

stream pointer to open file that has to be reopened.

So it appears that using devcpp/mingw the stdout/CON isn't opened so cannot be reopened. I'm guessing VC++ opens this file (CON) (and sdl or vc++ don't close it) allowing the freopen to work.

Another insignificant thing I noticed:

    FILE * ctt = fopen("CON", "w" );
    foo = (int)freopen( "CON", "w", stdout );
    bar = (int)freopen( "con", "w", stderr );
    freopen( "stdout.txt", "w", stdout );
    printf( "foo = %d, bar = %d, %d\n ", foo ,bar );
    screen = SDL_SetVideoMode(300, 300 , 32, SDL_HWSURFACE|SDL_DOUBLEBUF );
    fclose( ctt );	

With the first line commented out "foo" and "bar" have the values 0 and 0 or NULL and NULL.

[Drew_Benton]

Quote:

Original post by Easca OK from a quick scan through some documents ( C++ reference: cstdio: freopen:, MSDN and the UNIX manual page for freopen) I noted this little snippet: Quote: stream pointer to open file that has to be reopened. So it appears that using devcpp/mingw the stdout/CON isn't opened so cannot be reopened. I'm guessing VC++ opens this file (CON) (and sdl or vc++ don't close it) allowing the freopen to work. Another insignificant thing I noticed: *** Source Snippet Removed *** With the first line commented out "foo" and "bar" have the values 0 and 0 or NULL and NULL.

Thank you for taking a look into that. However, I think the problem is not with devcpp/mingw, for my console works fine wit it. It's with SDL. Someone has made a mistake or something on the Dev-CPP release of SDL, so that it messed with those streams. I know this because I can start a new project and have everything work fine. As soon as I link in SDL though, everything goes FUBAR'd.

Thank you for your efforts in this manner! They are appreciated.

- Drew

[cignox1]

...and this trick works for me too! Thank you all guys! Don't know why, but I felt that recompiling all was not the only solution, so I didn't do it ;-)

[amenzix]

http://www.gamedev.net/community/forums/topic.asp?topic_id=485639