Question

I am trying to load a file with a cocoa app but the app cant find the file

I use SDL_image, the code is:

SDL_Surface* surface = IMG_Load(file);

the file is: “/Resources/cursor.png”

I have tried using some lines in Objective-C but the app won’t run since it’s written in c++

Thanks,
Daniel

Update:

Texture loading code:

GLuint CGLTexture::load_texture(const char* file, bool wrap)
{
SDL_Surface* surface = IMG_Load(file);

if (!surface) {
    printf("Error, probably the file isn't there :S");
    return 0;
}

GLuint texture;
glPixelStorei(GL_UNPACK_ALIGNMENT,4);
glGenTextures(1, &texture);
glBindTexture(GL_TEXTURE_2D, texture);
SDL_PixelFormat *format = surface->format;

// select modulate to mix texture with color for shading
glTexEnvf( GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE );

// when texture area is small, bilinear filter the closest mipmap
glTexParameterf( GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER,
                GL_LINEAR_MIPMAP_NEAREST );
// when texture area is large, bilinear filter the first mipmap
glTexParameterf( GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR );

// if wrap is true, the texture wraps over at the edges (repeat)
//       ... false, the texture ends at the edges (clamp)
glTexParameterf( GL_TEXTURE_2D, GL_TEXTURE_WRAP_S,
                wrap ? GL_REPEAT : GL_CLAMP );
glTexParameterf( GL_TEXTURE_2D, GL_TEXTURE_WRAP_T,
                wrap ? GL_REPEAT : GL_CLAMP );

if (format->Amask)
{
    gluBuild2DMipmaps(GL_TEXTURE_2D, 4,
                      surface->w, surface->h, GL_RGBA,GL_UNSIGNED_BYTE, surface->pixels);
}
else
{
    gluBuild2DMipmaps(GL_TEXTURE_2D, 3,
                      surface->w, surface->h, GL_RGB, GL_UNSIGNED_BYTE, surface->pixels);
}
SDL_FreeSurface(surface);
return texture;
}

I call this function like this:

cursorTexture = CGLTexture::load_texture("/Resources/cursor.png",false);

The file is never found, I think this is somewhere in the app’s bundle, but, how can i access it with c++?

Answer 1

You can use objective-c++, then you have c++ and objective-c features.
To use objetive c in a portable environment use this:

header file:

std::string GetTextureFilename(const char *Name);

implementation file that ends with .mm and included only in mac:

std::string GetTextureFilename(const char *Name)
{
    return [[[NSBundle mainBundle]
                  pathForResource:
                      [NSString stringWithUTF8String: Name
                                              ofType: nil] toUTF8String];
}

source file that ends with .cpp and included only on other platforms:

std::string GetTextureFilename(const char *Name)
{
    return Name;
}