CODEWITHSUNDEEP
c++windowssdlsdl-2
Giovanni
Giovanni

Reputation: 33

Nothing happens when program runs (and no Window is created)

As of recent, I am very very frustrated with SDL2. Out of options here, so looking from some help from someone knowledgeable. I'm trying to get this darn thing working on Windows 8.1. I had no problems using the first SDL on Windows 7 which went by with a breeze. However, SDL2 is just not the same case.

I'm following the tutorials on "http://lazyfoo.net/tutorials/SDL/01_hello_SDL/windows/codeblocks/index.php" using the most recently updated codeblocks + minGW32 release. I've also tried it on Orwell Dev C++ + minGW32. However, something very very odd is happening, something I've never before seen in programming. My compiler is not giving me any errors. However, when the program runs, nothing happens. A window should be created and delayed for a few seconds. I've also tried the part 2 tutorial to show an image, and again, nothing happens.

I've followed all instructions exactly using both Code::Blocks and then Dev C++ IDE and I still am not getting anything, same results. Been working at and googling this for 2 days. What in god's name is happening to cause me all this stress? If you have any suggestions or have experienced this tragedy, please help! T.T

The code is very basic as shown:

//Using SDL and standard IO
#include <SDL.h>
#include <stdio.h>

//Screen dimension constants
const int SCREEN_WIDTH = 640;
const int SCREEN_HEIGHT = 480;

int main( int argc, char* args[] )
{
    //The window we'll be rendering to
    SDL_Window* window = NULL;

    //The surface contained by the window
    SDL_Surface* screenSurface = NULL;

    //Initialize SDL
    if( SDL_Init( SDL_INIT_VIDEO ) < 0 )
    {
        printf( "SDL could not initialize! SDL_Error: %s\n", SDL_GetError() );
    }
    else
    {
        //Create window
        window = SDL_CreateWindow( "SDL Tutorial", SDL_WINDOWPOS_UNDEFINED, SDL_WINDOWPOS_UNDEFINED, SCREEN_WIDTH, SCREEN_HEIGHT, SDL_WINDOW_SHOWN );
        if( window == NULL )
        {
            printf( "Window could not be created! SDL_Error: %s\n", SDL_GetError() );
        }
        else
        {
            //Get window surface
            screenSurface = SDL_GetWindowSurface( window );

            //Fill the surface white
            SDL_FillRect( screenSurface, NULL, SDL_MapRGB( screenSurface->format, 0xFF, 0xFF, 0xFF ) );

            //Update the surface
            SDL_UpdateWindowSurface( window );

            //Wait two seconds
            SDL_Delay( 2000 );
        }
    }

    //Destroy window
    SDL_DestroyWindow( window );

    //Quit SDL subsystems
    SDL_Quit();

    return 0;
}

This is the compiler output from Dev C++:

Compiling Project Changes...
--------
- Project File: C:\Users\Giovanni\Desktop\test\GioGame\GioGame.dev
- Compiler Name: MinGW GCC 4.8.1 32-bit Debug

Building makefile...
--------
- Filename: C:\Users\Giovanni\Desktop\test\GioGame\Makefile.win
- Output File: C:\Users\Giovanni\Desktop\test\GioGame\GioGame.exe

Processing makefile...
--------
- Makefile Processor: C:\Program Files (x86)\Dev-Cpp\MinGW32\bin\mingw32-make.exe
- Command: mingw32-make.exe -f "C:\Users\Giovanni\Desktop\test\GioGame\Makefile.win" all

g++.exe -c 01_hello_SDL.cpp -o 01_hello_SDL.o -I"C:/Program Files (x86)/Dev-Cpp/MinGW32/include" -I"C:/Program Files (x86)/Dev-Cpp/MinGW32/mingw32/include" -I"C:/Program Files (x86)/Dev-Cpp/MinGW32/lib/gcc/mingw32/4.8.1/include" -I"C:/Program Files (x86)/Dev-Cpp/MinGW32/lib/gcc/mingw32/4.8.1/include/c++" -I"C:/Users/Giovanni/Desktop/test/SDL2.0.3/include/SDL2" -g3

g++.exe 01_hello_SDL.o -o GioGame.exe -L"C:/Program Files (x86)/Dev-Cpp/MinGW32/lib" -L"C:/Program Files (x86)/Dev-Cpp/MinGW32/mingw32/lib" -L"C:/Users/Giovanni/Desktop/test/SDL2.0.3/lib" -static-libstdc++ -static-libgcc -lmingw32 -lSDL2main -lSDL2 -g3


Compilation Results...
--------
- Errors: 0
- Warnings: 0
- Output Size: 143.41796875 KiB
- Compilation Time: 2.86s

Finally solved. As I had a feeling, it was some problem with Windows or Windows 8.1 just shafting me for fun. I was very careful and redownloaded SDL2.0.3 and reapplied that patch thing for SDL_platform.h. THEN I completely uninstalled ALL of the IDEs that I tried, reinstalled Dev C++ in Windows 7 compatibility mode AS an administrator ON the desktop (ie not in Program Files x86). Then, I setup everything again and bam it worked.

Could be a problem with Windows 8.1 administrator BS shenanigans, or compatibility mode, or a corrupt download earlier, or the SDL I was using OR even the fact that it was installed to program files x86 which has a space in the file path and limited rights because windows.

So problem: because windows.

Upvotes: 1

Views: 2294

Answers (3)

Giovanni
Giovanni

Reputation: 33

Finally solved. As I had a feeling, it was some problem with Windows or Windows 8.1 just shafting me for fun. I was very careful and redownloaded SDL2.0.3 and reapplied that patch thing for SDL_platform.h. THEN I completely uninstalled ALL of the IDEs that I tried, reinstalled Dev C++ in Windows 7 compatibility mode AS an administrator ON the desktop (ie not in Program Files x86). Then, I setup everything again and bam it worked.

Could be a problem with Windows 8.1 administrator BS shenanigans, or compatibility mode, or a corrupt download earlier, or the SDL I was using OR even the fact that it was installed to program files x86 which has a space in the file path and limited rights because windows.

So problem: because windows.

Upvotes: 1

PeterT
PeterT

Reputation: 8284

The issue is that you are never letting windows enter the event-loop. The tutorial you are reading from assumes that the window will just show without ever handling the events, which will not happen on all platforms.

Just doing SDL_Delay( 2000 ); will just sleep for 2 seconds, but it will not let the thread handle events in the meantime.

If you replace that one line with 

        SDL_Event e;
        bool quit=false;
        while(!quit)
        {
            while( SDL_PollEvent( &e ) != 0 )
            {
                if( e.type == SDL_QUIT )
                {
                    quit = true;
                }
            }
        }

It will work fine (although it's busy waiting, but you can care about that later)

Upvotes: 4

mukunda
mukunda

Reputation: 2995

You should be getting a compiler error; your arguments for SDL_CreateWindow are transposed.

SDL_CreateWindow( "SDL Tutorial", SDL_WINDOWPOS_UNDEFINED, 
                  SCREEN_WIDTH, SCREEN_HEIGHT, SDL_WINDOW_SHOWN );

Declaration:

SDL_Window * SDLCALL SDL_CreateWindow( const char *title,
                                       int x, int y, int w,
                                       int h, Uint32 flags);

You are missing the y parameter, should be:

SDL_CreateWindow( "SDL Tutorial", SDL_WINDOWPOS_UNDEFINED, SDL_WINDOWPOS_UNDEFINED, 
                  SCREEN_WIDTH, SCREEN_HEIGHT, SDL_WINDOW_SHOWN );`

Upvotes: 0

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