ttf Text wont show up in SDL - render

Question

No matter what i try i cant get my text to load into a texture in SDL 2.0 using SDL_ttf.
Here is my textToTexture code
void sdlapp::textToTexture(string text, SDL_Color textColor,SDL_Texture* textTexture)
{
//free prevoius texture in textTexture if texture exists
if (textTexture != nullptr || NULL)
{
SDL_DestroyTexture(textTexture);
}
SDL_Surface* textSurface = TTF_RenderText_Solid(m_font, text.c_str(), textColor);
textTexture = SDL_CreateTextureFromSurface(m_renderer, textSurface);
//free surface
SDL_FreeSurface(textSurface);
}
And then here is me loading the texture and text
bool sdlapp::loadMedia()
{
bool success = true;
//load media here
//load font
m_font = TTF_OpenFont("Fonts/MotorwerkOblique.ttf", 28);
//load text
SDL_Color textColor = { 0x255, 0x255, 0x235 };
textToTexture("im a texture thing", textColor, m_font_texture);
return success;
}
And then this is the code i am using to render it
void sdlapp::render()
{
//clear the screen
SDL_RenderClear(m_renderer);
//do render stuff here
SDL_Rect rect= { 32, 64, 128, 32 };
SDL_RenderCopy(m_renderer, m_font_texture, NULL, NULL);
//update the screen to the current render
SDL_RenderPresent(m_renderer);
}
Does anyone know what i am doing wrong?
Thanks in Advance, JustinWeq.

Answer 1

textToTexture renders the text with SDL_ttf, the resulting SDL_Texture address is then assigned to a variable called textTexture. Problem is, textTexture is a local variable pointing to the same address as m_font_texture. They're not the same variable, they're different variables poiting to the same place, thus you're not changing any callee variables.
For clarification on pointers, I'd recommend seeing question 4.8 of the C-FAQ
I'd make textToTexture return the new texture address, and don't bother freeing resources that are not managed by it (m_font_texture belongs to sdlapp, it should be managed by it).