Hello, I'm working on the SDL Game Development book tutorial and I'm having trouble with displaying an image using SDL. There are no error messages, but the image isn't showing up. Can you help me with this issue?

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Yes, I can help you with that. Here are some steps you can take to troubleshoot the issue:

1. Verify that the image file you are trying to display exists and is in the correct location.
2. Check that SDL is initialized correctly before attempting to load the image.
3. Make sure the image is loaded correctly by checking the return value of the SDL_LoadBMP() function.
4. Verify that the image is actually blitted to the surface by checking that the return value of the SDL_BlitSurface() function is 0.
5. Ensure that the surface is updated by calling SDLUpdateWindowSurface() or SDLFlip().

If none of these steps help resolve the issue, please provide more details about your code so we can better assist you.