Thread: Trying to use SDL and C to display an image in command prompt

Code:

#include <stdio.h>
#include <stdlib.h>


#include <SDL/SDL.h>


#include <windows.h>
#include <tlhelp32.h>
#include <tchar.h>


BOOL WINAPI AttachConsole(DWORD);


pid_t GetProcessID( char * ProcessName )
{


    HANDLE hProcessSnap;
    PROCESSENTRY32 pe32;


    /* Take a snapshot of all processes in the system. */
    hProcessSnap = CreateToolhelp32Snapshot( TH32CS_SNAPPROCESS, 0 );
    if( hProcessSnap == INVALID_HANDLE_VALUE )
    {
        return 0;
    }


    /* Set the size of the structure before using it. */
    pe32.dwSize = sizeof( PROCESSENTRY32 );


    if( !Process32First( hProcessSnap, &pe32 ) )
    {
    CloseHandle( hProcessSnap );
    exit(EXIT_FAILURE);
    }


    /* Walk through the snapshot, and return the process handle when
       found. */


    do
    {
        if (strcmp(pe32.szExeFile, ProcessName) == 0)
        {
            CloseHandle( hProcessSnap );
            return pe32.th32ProcessID;
        }
    } while( Process32Next( hProcessSnap, &pe32 ) );


  CloseHandle( hProcessSnap );


  return 0;
}


int main( int argc, char * argv[] )
{
    if ( argc != 2 )
    {
        fprintf(stderr, "You must have at least 1 argument!");
        exit(1);
    }


    pid_t CommandPromptID = 0;


    while ( ( CommandPromptID = GetProcessID("cmd.exe") ) == 0 ) Sleep(5000); /* Get command prompt's identifier */


    if ( !AttachConsole( CommandPromptID ) )
    {
        fprintf(stderr, "Could not attach to the command prompt console!");
        exit(1);
    }


    if ( SDL_Init( SDL_INIT_VIDEO ) == -1 )
    {
        fprintf(stderr, "Failed to initialize SDL!");
        exit(1);
    }


    SDL_Surface* image = NULL;
    SDL_Surface* console = NULL;


    SDL_Rect my_image = { 160, 100, 200, 200 };
    SDL_Rect * p_my_image = &my_image;


    if ( ( image = SDL_LoadBMP( argv[1] ) ) == NULL )
    {
        fprintf(stderr, "Could not load the bitmap image!");
        SDL_FreeSurface( image );
        SDL_Quit();
        exit(1);
    }


    if ( ( console = SDL_GetVideoSurface( ) ) == NULL )
    {
        fprintf(stderr, "Could not get the current console screen!");
        SDL_FreeSurface( image );
        SDL_Quit();
        exit(1);
    }


    SDL_BlitSurface( image, NULL, console, p_my_image);
    SDL_Flip( console );
    SDL_Delay(2000);


    SDL_FreeSurface( image );


    SDL_Quit();


    return 0;
}

After linking the code there are no errors or warnings. It always fails at this line though

Code:

    if ( ( console = SDL_GetVideoSurface( ) ) == NULL )

Then it, of course, displays my error message. Is there a better way of filling out the console struct? Should I do it myself? Is my method of calling AttachConsole to be able to get the image on the screen even valid? Those are the questions I can't answer for myself right now. Also, even if it would be better to fill out the data myself, I would have trouble trying to get the information since I don't know how to get it.

The first rule of c club is google.

The second rule of c club is google.

The third rule of c club is google.

The fourth rule of c club is errm... if you can't be bothered - get some idiot to do it for you.

Oh well!