Thread: problem with sdl and vectors

hi im having a problem when i call a function for an object in a vector. when i call the objects function when its not in the vector, it works fine, but if i call it in the vector i get an sdl error telling me the surface needs to be locked, even though i dont ever need pixel access, and it doesnt cause the error when called normally. heres what im doing :

Code:

     testTile.draw(20,20);
     testTile.draw(40,20);
     testTile.draw(40,40);

     tiles[0][0].draw(80, 70);

BlitSurface errorSurfaces must not be locked during blit is the error i get.

the tiles are all initializing fine, coz other methods work, so im not sure whats causing the problem.

any help will be great.

thanks rob

below is the code in full context

Code:

bool Map::init(char *mapName){

     ifstream mapFile(mapName);

     if(!mapFile.is_open()){ // could not open file

          cout << "Unable to open Map " << mapName << "\n";
          mapFile.close();
          return false;

     }
     else{ // continue to read map

          cout << mapName << " loaded\n";

          mapFile >> mapWidth >> mapHeight >> tileWidth >> tileHeight >> xOffset >> yOffset; 

          vector< vector<Tile> > loadedTiles(mapHeight, vector<Tile>(mapWidth)); 

          testTile.init("stone.bmp", 1, 1);
          
          for(int j = 0; j < 1; j++){ // also here if i make this loop any larger i get Fatal signal: Segmentation Fault (SDL Parachute Deployed)
               for(int i = 0; i < mapWidth; i++){                    

                    char filename[256];
                    int passable, transparent;

                    mapFile >> filename >> passable >> transparent;
                    loadedTiles[i][j].init(filename, passable, transparent);
                    loadedTiles[i][j].toString();
               }
          }

          mapFile.close();
          tiles = loadedTiles;

          return true;
     }
     
} // end init


bool Map::draw(){

     testTile.draw(20,20);
     testTile.draw(40,20);
     testTile.draw(40,40); // ALL DRAW FINE

     tiles[0][0].toString();  // WORKS
     tiles[0][0].draw(80, 70); // CAUSES SDL ERROR
     

     /*
     for(int j = 0; j < mapHeight; j++){
          for(int i = 0; i < mapWidth; i++){
          
               tiles[i][j].toString();

          }
     }*/

     return true;
} // end draw

>> when i call the objects function when its not in the vector, it works fine,...
Make a copy of the object and see if it works on the copy.

gg

when i copy the object i get the same error, so this would suggest some problem with the initialization of the object? just cant see what, any ideas?

ive now tryed the whole thing using a 2d array instead of a vector of vectors, and it works!

*NEW PROBLEM*

i need the array to be dynamicaly sized. any ideas how to do this, or how to fix the problem i have with the vectors?

cheers rob

>> when i copy the object i get the same error, so this would suggest some problem with the initialization of the object?
Close. Your copy constructors are not right. Either go with a solution that does not involve copying your objects are fix your objects so that they can be copied without side effects.

gg