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can't overwrite .ini value

I'm trying to save the changes I make to the FullscreenMode key in GameUserSettings.ini

The changes are applied and the value is written into the GameUserSettings.ini but I can't seem to overwrite the value once it's set. In the DefaultGameUserSettings.ini I have FullscreenMode=2, in the GameUserSettings.ini I have FullscreenMode=0.

I'm following Rama's Guide. This is what I got:

 static FString GetIni(FString WhatIni)
     FString s = "";

     if (WhatIni == "GGameIni") s = GGameIni;
     if (WhatIni == "GScalabilityIni") s = GScalabilityIni;
     if (WhatIni == "GEngineIni") s = GEngineIni;
     if (WhatIni == "GGameUserSettingsIni") s = GGameUserSettingsIni;
     return s;

 UFUNCTION(BlueprintCallable, Category = Config)
 static void SaveStringToConfig (FString Section, FString RootDir, FString WhatText, FString WhatIni)
     if (!GConfig) return;

     FString TargetIni = GetIni(WhatIni);

     GConfig->SetString(*Section, *RootDir, *WhatText, TargetIni);

     //void Flush( bool Read, const FString& Filename=TEXT("") );
     GConfig->Flush(false, TargetIni);

I also tried it with GConfig->SetInt(...) but it made no difference. Any idea what I'm doing wrong?

Product Version: UE older version
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asked Jan 09 '17 at 05:01 PM in C++ Programming

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