How can I fix SFML errors in VS 2019 on windows?

Question

I followed a video on LinkedIn to setup SFML, but when I tried compiling the code get several errors, some of which are:

C2065 'Fullscreen': undeclared identifier
C3861 'RenderWindow':identifier not found
C2871 'sf': a namespace with this name does not exist
C2653 'Style':is not a class or namespace name
C2065 'VideoMode':undeclared identifier
C3861 'vm' :identifier not found
C2065 'vm' :undeclared identifier
C26444 Don't try to declare a local variable with no name(es.84)
C2146 syntax error:missing ';' before identifier 'vm'

Your bug is your don't have #include "pch.h" as the first line. In Visual Studio when using precompiled headers the compiler ignores every line above #include "pch.h" — drescherjm
– drescherjm, Commented Sep 2, 2020 at 13:10
Although, in this particular case, your 'bug' is apparent, you really should post your code as a (code-formatted) text block, rather than as an image. Otherwise, your question is likely to be closed as "Needs details or clarity!" I would recommend you edit your question to do that. — Adrian Mole
– Adrian Mole, Commented Sep 2, 2020 at 13:20

Adrian Mole · Accepted Answer · 2020-09-02 13:22:17Z

1

Assuming (from its name) that "pch.h" generates and/or uses the precompiled header for your build, then that has to be the very first header included in any source file. Otherwise, anything 'gleaned' from headers included before it will be lost, as the compiler only looks in that precompiled header and files included afterwards.

So, just rearrange your top three lines as follows:

#include "pch.h" // MUST be the first header included!
#include <iostream>
#include <SFML/Graphics.hpp>

For an interesting (and informative) discussion about precompiled headers in Visual Studio, see this Stack Overflow question, and the answers there: Precompiled Headers.

edited Sep 2, 2020 at 13:22

answered Sep 2, 2020 at 13:11

Adrian Mole

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