Visual studio, intelliSense errors and the project 'put name' has been modified outside the environement.

[Wapiti-Blue]

Hi all,

Im learning c++ and have some issue. When i open or create any c++ projects i have intelliSense errors, and need “reload all” because the project has been modified out the environement.

I didn’t modify the project i just create new c++ class for show you pics.

[Gulli_Gullile]

If I have any weird engine compile errors like this I always do the following:
Delete everything, that is not absolutely necessary to compile the game:

• Binaries
• DerivedDataCache
• Intermediate
• Saved
• In root folder YourGameName.sln

Then keep both editors, unreal and visual studio closed. Go to the file explorer, select your YourGameName.uproject file and klick ‘Generate Visual Studio Files’. That takes a small bit of time, depending on your hardware.

After that you can open the .sln and hit Build. Make sure

• Build Configuration is ‘Development Editor’
• Startup Project is Games->YourGameName.
• In error List in VS choose ‘Build Only’. For Unreal Intellisense feels a bit wonky.

To really get C++ up and running I also needed to

• install the unreal integration

• some more C++ Packages (VS wont stop screaming after you have)

• disable ‘Live Coding’ in Unreal

• fix 2 compile errors from code that was shipped (really easy ones, vs opens the line if you double klick the error in the error list)

I also always compile the code with the engine closed and only open the engine editor with the ‘Local Windows Debugger’ in VS.

Hope that helps

[Wapiti-Blue]

Hey @Gulli_Gullile,

Thank for this complet post is very helpfull for me. I need to delete files and generate visual studio project file for every class or something i create and edit in visual studio?

It’s saved me a lot of time.

[Gulli_Gullile]

Hi,

Add the Cpp files always with tools ‘Add C++’ File in Unreal. This usually works without deleting everything. Deleting everything is something I do if I encounter unexpected compile issues.

[Wapiti-Blue]

@Gulli_Gullile,

Hello, i dont undestand your technique can you put screenshoot please? what do you thing about change source code editor?

[Gulli_Gullile]

I did not mention changing the source control. That is an entirely different story

• In unreal in submenu 1 ‘Tools’ choose ‘Add c++ class’ to add a new class
• In unreal disable live coding enabled in the submenu of 2 in the screenshot

• In Visual studio use DevelopmentEditor as Build Config [1]
• Local Windows debugger starts the debugging process and unreal [2]
• In this screenshot unter Games SilentMountains is the startup project [3]

In the launcher you must install the Visual Studio Integration Tool (Sorry my OS is configured in German ). Without that tool you get all kinds of different weird errors, because Unreal does not use a standarized C++ Compiler.

Please also take a look in the documentation Install Visual Studio Tools for Unreal Engine | Microsoft Learn
Installing Unreal Engine | Unreal Engine 5.3 Documentation