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SDL fails to display image?

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0

My code doesn't display anything. All I get is a window with no image.

#include <iostream>
#include <stdio.h>
#include <SDL2/SDL.h>

using namespace std;

SDL_Window *gWindow=NULL;
SDL_Surface *gScreenSurface=NULL;
SDL_Surface *gHelloWorld=NULL;

const int SCREEN_WIDTH=640, SCREEN_HEIGHT=480;
bool init()
 bool success = true;

 if(SDL_Init (SDL_INIT_VIDEO) < 0 ) 
 printf("SDL could not initialize! SDL_Error : %s n", SDL_GetError() );
 success=false;
 
 else
 gWindow = SDL_CreateWindow ( "SDL Tutorial", SDL_WINDOWPOS_UNDEFINED, SDL_WINDOWPOS_UNDEFINED, SCREEN_WIDTH, SCREEN_HEIGHT, SDL_WINDOW_SHOWN );
 if( gWindow == NULL )
 printf( "Window could not be created! SDL_Error: %sn", SDL_GetError() );
 success=false;
 
 else 
 gScreenSurface = SDL_GetWindowSurface (gWindow);
 
 
 return success;


bool loadMedia()
 bool success=true;

 gHelloWorld = SDL_LoadBMP ( "hello_world.bmp" );
 if (gHelloWorld == NULL )
 printf( "Unable to load image %s! SDL Error: %sn", "hello_world.bmp", SDL_GetError() );
 success=false;
 
 return success;


void close()
 SDL_FreeSurface( gHelloWorld );
 gHelloWorld=NULL;

 SDL_DestroyWindow( gWindow );
 gWindow=NULL;

 SDL_Quit();


int main(int argc, char* args[]){
 if(!init())
 printf( "failed to initialize!n" );
 
 else 
 if( !loadMedia() ) 
 printf ("failed to laod media! n");
 
 else 
 SDL_BlitSurface( gHelloWorld, NULL, SDL_GetWindowSurface(gWindow), NULL );
 SDL_UpdateWindowSurface ( gWindow );
 SDL_Delay (2000);
 
 
 close();

I expect it to show me a bmp image which is in the path specified here in the loadBMP() function but all I get is an empty transparent window.

I am using KDE Konsole, if that has to do something with this.

c++ linux sdl

share|improve this question

edited Mar 28 at 17:43

genpfault

43.4k99 gold badges5757 silver badges102102 bronze badges

asked Mar 28 at 12:09

Deepak SharmaDeepak Sharma

411 bronze badge

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Do you get your "Unable to load image %s! SDL Error: %sn" error message on console?
  
  – Scheff
  Mar 28 at 12:16
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Have you tried a different .bmp file? Your code worked fine for me after I installed sdl2 and compiled with clang++ main.cpp `sdl2-config --libs`. Also, I'm assuming your image is in the same directory as your executable?
  
  – David Vereb
  Mar 28 at 12:29
  
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  I cannot imagine that g++ vs. clang++ has an effect on this... ;-)
  
  – Scheff
  Mar 28 at 12:35
  
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  You should have proper update loop and redraw when window manager asks you to (or just redraw unconditionally). Draw&delay is not a way to display things.
  
  – keltar
  Mar 28 at 18:55
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  @MiguelÁngelRetamozoSanchez: I think that's only an issue with C compilers or if you declare close() as extern "C" so that C++ doesn't name-mangle it into the default file- or translation-unit-local anonymous namespace.
  
  – genpfault
  Mar 29 at 13:43
  

  
  
  
  

 | 
show 11 more comments

0

My code doesn't display anything. All I get is a window with no image.

#include <iostream>
#include <stdio.h>
#include <SDL2/SDL.h>

using namespace std;

SDL_Window *gWindow=NULL;
SDL_Surface *gScreenSurface=NULL;
SDL_Surface *gHelloWorld=NULL;

const int SCREEN_WIDTH=640, SCREEN_HEIGHT=480;
bool init()
 bool success = true;

 if(SDL_Init (SDL_INIT_VIDEO) < 0 ) 
 printf("SDL could not initialize! SDL_Error : %s n", SDL_GetError() );
 success=false;
 
 else
 gWindow = SDL_CreateWindow ( "SDL Tutorial", SDL_WINDOWPOS_UNDEFINED, SDL_WINDOWPOS_UNDEFINED, SCREEN_WIDTH, SCREEN_HEIGHT, SDL_WINDOW_SHOWN );
 if( gWindow == NULL )
 printf( "Window could not be created! SDL_Error: %sn", SDL_GetError() );
 success=false;
 
 else 
 gScreenSurface = SDL_GetWindowSurface (gWindow);
 
 
 return success;


bool loadMedia()
 bool success=true;

 gHelloWorld = SDL_LoadBMP ( "hello_world.bmp" );
 if (gHelloWorld == NULL )
 printf( "Unable to load image %s! SDL Error: %sn", "hello_world.bmp", SDL_GetError() );
 success=false;
 
 return success;


void close()
 SDL_FreeSurface( gHelloWorld );
 gHelloWorld=NULL;

 SDL_DestroyWindow( gWindow );
 gWindow=NULL;

 SDL_Quit();


int main(int argc, char* args[]){
 if(!init())
 printf( "failed to initialize!n" );
 
 else 
 if( !loadMedia() ) 
 printf ("failed to laod media! n");
 
 else 
 SDL_BlitSurface( gHelloWorld, NULL, SDL_GetWindowSurface(gWindow), NULL );
 SDL_UpdateWindowSurface ( gWindow );
 SDL_Delay (2000);
 
 
 close();

I expect it to show me a bmp image which is in the path specified here in the loadBMP() function but all I get is an empty transparent window.

I am using KDE Konsole, if that has to do something with this.

c++ linux sdl

share|improve this question

edited Mar 28 at 17:43

genpfault

43.4k99 gold badges5757 silver badges102102 bronze badges

asked Mar 28 at 12:09

Deepak SharmaDeepak Sharma

411 bronze badge

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Do you get your "Unable to load image %s! SDL Error: %sn" error message on console?
  
  – Scheff
  Mar 28 at 12:16
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Have you tried a different .bmp file? Your code worked fine for me after I installed sdl2 and compiled with clang++ main.cpp `sdl2-config --libs`. Also, I'm assuming your image is in the same directory as your executable?
  
  – David Vereb
  Mar 28 at 12:29
  
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  I cannot imagine that g++ vs. clang++ has an effect on this... ;-)
  
  – Scheff
  Mar 28 at 12:35
  
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  You should have proper update loop and redraw when window manager asks you to (or just redraw unconditionally). Draw&delay is not a way to display things.
  
  – keltar
  Mar 28 at 18:55
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  @MiguelÁngelRetamozoSanchez: I think that's only an issue with C compilers or if you declare close() as extern "C" so that C++ doesn't name-mangle it into the default file- or translation-unit-local anonymous namespace.
  
  – genpfault
  Mar 29 at 13:43
  

  
  
  
  

 | 
show 11 more comments

My code doesn't display anything. All I get is a window with no image.

#include <iostream>
#include <stdio.h>
#include <SDL2/SDL.h>

using namespace std;

SDL_Window *gWindow=NULL;
SDL_Surface *gScreenSurface=NULL;
SDL_Surface *gHelloWorld=NULL;

const int SCREEN_WIDTH=640, SCREEN_HEIGHT=480;
bool init()
 bool success = true;

 if(SDL_Init (SDL_INIT_VIDEO) < 0 ) 
 printf("SDL could not initialize! SDL_Error : %s n", SDL_GetError() );
 success=false;
 
 else
 gWindow = SDL_CreateWindow ( "SDL Tutorial", SDL_WINDOWPOS_UNDEFINED, SDL_WINDOWPOS_UNDEFINED, SCREEN_WIDTH, SCREEN_HEIGHT, SDL_WINDOW_SHOWN );
 if( gWindow == NULL )
 printf( "Window could not be created! SDL_Error: %sn", SDL_GetError() );
 success=false;
 
 else 
 gScreenSurface = SDL_GetWindowSurface (gWindow);
 
 
 return success;


bool loadMedia()
 bool success=true;

 gHelloWorld = SDL_LoadBMP ( "hello_world.bmp" );
 if (gHelloWorld == NULL )
 printf( "Unable to load image %s! SDL Error: %sn", "hello_world.bmp", SDL_GetError() );
 success=false;
 
 return success;


void close()
 SDL_FreeSurface( gHelloWorld );
 gHelloWorld=NULL;

 SDL_DestroyWindow( gWindow );
 gWindow=NULL;

 SDL_Quit();


int main(int argc, char* args[]){
 if(!init())
 printf( "failed to initialize!n" );
 
 else 
 if( !loadMedia() ) 
 printf ("failed to laod media! n");
 
 else 
 SDL_BlitSurface( gHelloWorld, NULL, SDL_GetWindowSurface(gWindow), NULL );
 SDL_UpdateWindowSurface ( gWindow );
 SDL_Delay (2000);
 
 
 close();

I expect it to show me a bmp image which is in the path specified here in the loadBMP() function but all I get is an empty transparent window.

I am using KDE Konsole, if that has to do something with this.

c++ linux sdl

share|improve this question

edited Mar 28 at 17:43

genpfault

43.4k99 gold badges5757 silver badges102102 bronze badges

asked Mar 28 at 12:09

Deepak SharmaDeepak Sharma

411 bronze badge

#include <iostream>
#include <stdio.h>
#include <SDL2/SDL.h>

using namespace std;

SDL_Window *gWindow=NULL;
SDL_Surface *gScreenSurface=NULL;
SDL_Surface *gHelloWorld=NULL;

const int SCREEN_WIDTH=640, SCREEN_HEIGHT=480;
bool init()
 bool success = true;

 if(SDL_Init (SDL_INIT_VIDEO) < 0 ) 
 printf("SDL could not initialize! SDL_Error : %s n", SDL_GetError() );
 success=false;
 
 else
 gWindow = SDL_CreateWindow ( "SDL Tutorial", SDL_WINDOWPOS_UNDEFINED, SDL_WINDOWPOS_UNDEFINED, SCREEN_WIDTH, SCREEN_HEIGHT, SDL_WINDOW_SHOWN );
 if( gWindow == NULL )
 printf( "Window could not be created! SDL_Error: %sn", SDL_GetError() );
 success=false;
 
 else 
 gScreenSurface = SDL_GetWindowSurface (gWindow);
 
 
 return success;


bool loadMedia()
 bool success=true;

 gHelloWorld = SDL_LoadBMP ( "hello_world.bmp" );
 if (gHelloWorld == NULL )
 printf( "Unable to load image %s! SDL Error: %sn", "hello_world.bmp", SDL_GetError() );
 success=false;
 
 return success;


void close()
 SDL_FreeSurface( gHelloWorld );
 gHelloWorld=NULL;

 SDL_DestroyWindow( gWindow );
 gWindow=NULL;

 SDL_Quit();


int main(int argc, char* args[]){
 if(!init())
 printf( "failed to initialize!n" );
 
 else 
 if( !loadMedia() ) 
 printf ("failed to laod media! n");
 
 else 
 SDL_BlitSurface( gHelloWorld, NULL, SDL_GetWindowSurface(gWindow), NULL );
 SDL_UpdateWindowSurface ( gWindow );
 SDL_Delay (2000);
 
 
 close();

share|improve this question

edited Mar 28 at 17:43

genpfault

43.4k99 gold badges5757 silver badges102102 bronze badges

asked Mar 28 at 12:09

Deepak SharmaDeepak Sharma

411 bronze badge

share|improve this question

edited Mar 28 at 17:43

genpfault

43.4k99 gold badges5757 silver badges102102 bronze badges

asked Mar 28 at 12:09

Deepak SharmaDeepak Sharma

411 bronze badge

edited Mar 28 at 17:43

genpfault

43.4k99 gold badges5757 silver badges102102 bronze badges

edited Mar 28 at 17:43

genpfault

43.4k99 gold badges5757 silver badges102102 bronze badges

asked Mar 28 at 12:09

Deepak SharmaDeepak Sharma

411 bronze badge

asked Mar 28 at 12:09

Deepak SharmaDeepak Sharma

411 bronze badge

1 Answer
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1

KDE eh? Plasma composites by default; try disabling compositing or add a proper event-handling loop so your process has a chance to handle repaint events.

share|improve this answer

edited Mar 28 at 19:53

answered Mar 28 at 17:47

genpfaultgenpfault

43.4k99 gold badges5757 silver badges102102 bronze badges

add a comment
 | 

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1

KDE eh? Plasma composites by default; try disabling compositing or add a proper event-handling loop so your process has a chance to handle repaint events.

share|improve this answer

edited Mar 28 at 19:53

answered Mar 28 at 17:47

genpfaultgenpfault

43.4k99 gold badges5757 silver badges102102 bronze badges

add a comment
 | 

1

KDE eh? Plasma composites by default; try disabling compositing or add a proper event-handling loop so your process has a chance to handle repaint events.

share|improve this answer

edited Mar 28 at 19:53

answered Mar 28 at 17:47

genpfaultgenpfault

43.4k99 gold badges5757 silver badges102102 bronze badges

add a comment
 | 

KDE eh? Plasma composites by default; try disabling compositing or add a proper event-handling loop so your process has a chance to handle repaint events.

share|improve this answer

edited Mar 28 at 19:53

answered Mar 28 at 17:47

genpfaultgenpfault

43.4k99 gold badges5757 silver badges102102 bronze badges

share|improve this answer

edited Mar 28 at 19:53

answered Mar 28 at 17:47

genpfaultgenpfault

43.4k99 gold badges5757 silver badges102102 bronze badges

answered Mar 28 at 17:47

genpfaultgenpfault

43.4k99 gold badges5757 silver badges102102 bronze badges

answered Mar 28 at 17:47

genpfaultgenpfault

43.4k99 gold badges5757 silver badges102102 bronze badges