Handling Invalid Window IDs

If you pass an invalid windowID to SDL_GetWindowFromID(), the function will return nullptr. SDL uses nullptr to indicate that no window exists with the given ID.

Common Scenarios for Invalid IDs

• A window was destroyed, and its ID is no longer valid.
• You accidentally passed an uninitialized or incorrect ID.
• Bugs in your program caused the wrong ID to be stored or retrieved.

Here’s an example:

1// Invalid ID
2SDL_Window* window = SDL_GetWindowFromID(9999);
3if (!window) {
4  std::cerr << "Error: Invalid window ID\n";
5}

Best Practices

• Always check for nullptr after calling SDL_GetWindowFromID().
• Use SDL_DestroyWindow() cautiously to avoid dangling references.
• Log or debug IDs to ensure they are correct.

By handling invalid IDs gracefully, you can avoid crashes and improve the robustness of your application.