Init

.gitignore

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+build/
+result

CMakeLists.txt

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+cmake_minimum_required(VERSION 3.16)
+project(QT LANGUAGES CXX)
+
+set(CMAKE_AUTOMOC ON)
+set(CMAKE_CXX_STANDARD 17)
+set(CMAKE_EXPORT_COMPILE_COMMANDS ON)
+
+find_package(Qt6 REQUIRED COMPONENTS Core Gui Qml Quick QuickControls2)
+
+qt_policy(SET QTP0001 NEW)
+qt_policy(SET QTP0004 NEW)
+
+qt_add_executable(qtapp src/main.cpp)
+
+qt_add_qml_module(qtapp
+    URI App
+    VERSION 1.0
+    QML_FILES
+        src/Main.qml
+    SOURCES
+)
+
+target_include_directories(qtapp PRIVATE src)
+
+target_link_libraries(qtapp PRIVATE
+    Qt6::Core
+    Qt6::Gui
+    Qt6::Qml
+    Qt6::Quick
+    Qt6::QuickControls2
+)
+
+install(TARGETS qtapp DESTINATION ${CMAKE_INSTALL_BINDIR})
+

Launcher.cfg

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+{
+    "Port": 4444,
+    "Build": "Default",
+    "CachingDirectory": "./Resources"
+}

Launcher.log

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+[6/7/2026 21:00:33] [DEBUG] Launcher was invoked as: 'BeamMP-Launcher --no-launch'
+[6/7/2026 21:00:33] [INFO] BeamMP Launcher v2.8.0
+[6/7/2026 21:00:39] [INFO] Launcher version is up to date. Latest version: 2.8.0
+[6/7/2026 21:00:39] [INFO] IMPORTANT: You MUST keep this window open to play BeamMP!
+[6/7/2026 21:00:39] [DEBUG] HTTP Proxy listening on port 55275
+[6/7/2026 21:00:39] [INFO] Game Version : 0.38.6.0
+[6/7/2026 21:00:39] [INFO] Game user path: /home/chris/.local/share/BeamNG/BeamNG.drive/current/
+[6/7/2026 21:00:42] [DEBUG] Core Network on start! port: 4444
+[6/7/2026 21:00:44] [INFO] Game Connected!
+[6/7/2026 21:00:57] [INFO] Attempting to authenticate...
+[6/7/2026 21:00:58] [INFO] Authentication successful!
+[6/7/2026 21:00:58] [DEBUG] Authentication result: Welcome guest9658030
+[6/7/2026 21:01:15] [INFO] Connecting to server
+[6/7/2026 21:01:15] [DEBUG] MAIN LOOP OF GAME SERVER
+[6/7/2026 21:01:16] [ERROR] Client: connect failed! Error code: 111
+[6/7/2026 21:01:17] [DEBUG] Terminating TCP Socket: 24
+[6/7/2026 21:01:17] [WARN] Failed to close socket!
+[6/7/2026 21:01:17] [DEBUG] Terminating GTCP Socket: 22
+[6/7/2026 21:01:17] [DEBUG] (Proxy) accept failed with error: 22
+[6/7/2026 21:01:17] [DEBUG] Waiting for client thread
+[6/7/2026 21:01:17] [DEBUG] Client thread done
+[6/7/2026 21:01:17] [DEBUG] END OF GAME SERVER
+[6/7/2026 21:01:46] [DEBUG] MAIN LOOP OF GAME SERVER
+[6/7/2026 21:01:46] [INFO] Connecting to server
+[6/7/2026 21:01:46] [INFO] Connected!
+[6/7/2026 21:02:26] [DEBUG] (TCP) Connection closing... CheckBytes(16)
+[6/7/2026 21:02:26] [INFO] Terminated!
+[6/7/2026 21:02:26] [DEBUG] Mod info: 
+[6/7/2026 21:02:26] [DEBUG] Failed to receive mod list: [json.exception.parse_error.101] parse error at line 1, column 1: attempting to parse an empty input; check that your input string or stream contains the expected JSON
+[6/7/2026 21:02:26] [DEBUG] Failed to receive new mod list format! This server may be outdated, but everything should still work as expected.
+[6/7/2026 21:02:26] [ERROR] (Game) send failed with error: 9
+[6/7/2026 21:02:29] [DEBUG] Terminating TCP Socket: 24
+[6/7/2026 21:02:29] [WARN] Failed to close socket!
+[6/7/2026 21:02:29] [DEBUG] Terminating GTCP Socket: 22
+[6/7/2026 21:02:29] [DEBUG] (Proxy) accept failed with error: 22
+[6/7/2026 21:02:29] [DEBUG] Waiting for client thread
+[6/7/2026 21:02:29] [DEBUG] Client thread done
+[6/7/2026 21:02:29] [DEBUG] END OF GAME SERVER
+[6/7/2026 21:02:33] [INFO] Connecting to server
+[6/7/2026 21:02:33] [DEBUG] MAIN LOOP OF GAME SERVER
+[6/7/2026 21:02:33] [ERROR] Client: connect failed! Error code: 111
+[6/7/2026 21:02:35] [DEBUG] Terminating TCP Socket: 24
+[6/7/2026 21:02:35] [WARN] Failed to close socket!
+[6/7/2026 21:02:35] [DEBUG] Terminating GTCP Socket: 22
+[6/7/2026 21:02:35] [DEBUG] (Proxy) accept failed with error: 22
+[6/7/2026 21:02:35] [DEBUG] Waiting for client thread
+[6/7/2026 21:02:35] [DEBUG] Client thread done
+[6/7/2026 21:02:35] [DEBUG] END OF GAME SERVER
+[6/7/2026 21:02:41] [INFO] Connecting to server
+[6/7/2026 21:02:41] [DEBUG] MAIN LOOP OF GAME SERVER
+[6/7/2026 21:02:41] [INFO] Connected!
+[6/7/2026 21:03:21] [DEBUG] (TCP) Connection closing... CheckBytes(16)
+[6/7/2026 21:03:21] [INFO] Terminated!
+[6/7/2026 21:03:21] [DEBUG] Mod info: 
+[6/7/2026 21:03:21] [DEBUG] Failed to receive mod list: [json.exception.parse_error.101] parse error at line 1, column 1: attempting to parse an empty input; check that your input string or stream contains the expected JSON
+[6/7/2026 21:03:21] [DEBUG] Failed to receive new mod list format! This server may be outdated, but everything should still work as expected.
+[6/7/2026 21:03:21] [ERROR] (Game) send failed with error: 9
+[6/7/2026 21:03:25] [DEBUG] Terminating TCP Socket: 24
+[6/7/2026 21:03:25] [WARN] Failed to close socket!
+[6/7/2026 21:03:25] [DEBUG] Terminating GTCP Socket: 22
+[6/7/2026 21:03:25] [DEBUG] (Proxy) accept failed with error: 22
+[6/7/2026 21:03:25] [DEBUG] Waiting for client thread
+[6/7/2026 21:03:25] [DEBUG] Client thread done
+[6/7/2026 21:03:25] [DEBUG] END OF GAME SERVER

README.md

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+# Simple QT/Qml + Nix dev env
+
+
+- Run `cmake -B build` and `cmake --build build`
+- Run `nix build -L` to build
+- Add this to helix:
+```ini
+[language-server.qmlls]
+command = "qmlls"
+args = ["-E", "-b", "build"]
+```

compile_commands.json

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+build/compile_commands.json

flake.lock

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+{
+  "nodes": {
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1782723713,
+        "narHash": "sha256-oPXCU/SSUokcGaJREHibG1CBX3+s/W7orDWQOZDsEeQ=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "b5aa0fbd538984f6e3d201be0005b4463d8b09f8",
+        "type": "github"
+      },
+      "original": {
+        "owner": "NixOS",
+        "ref": "nixos-unstable",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "root": {
+      "inputs": {
+        "nixpkgs": "nixpkgs"
+      }
+    }
+  },
+  "root": "root",
+  "version": 7
+}

flake.nix

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+
+{
+  description = "QT Flake";
+
+  inputs = {
+    nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";
+  };
+
+  outputs = {self, nixpkgs}: {
+    defaultPackage.x86_64-linux = let
+      pkgs = import nixpkgs { system = "x86_64-linux"; };
+    in
+    pkgs.stdenv.mkDerivation {
+      name = "QT";
+      src = builtins.path { path = ./.; filter = path: type: baseNameOf path != "build"; };
+      nativeBuildInputs = with pkgs; [
+        cmake
+        qt6.wrapQtAppsHook
+      ];
+      buildInputs = with pkgs; [
+        qt6.qtbase
+        qt6.qtdeclarative
+        qt6.qtwayland
+      ];
+    };
+
+
+    devShell.x86_64-linux = let
+      pkgs = import nixpkgs { system = "x86_64-linux"; };
+    in
+    pkgs.mkShell {
+      buildInputs = with pkgs; [
+        cmake
+        gcc
+        clang-tools
+        qt6.qtbase
+        qt6.qtdeclarative
+        qt6.qtlanguageserver
+        qt6.qttools
+        qt6.qtwayland
+        # qtcreator
+      ];
+
+      shellHook = ''
+        export QML_IMPORT_PATH="${pkgs.qt6.qtdeclarative}/lib/qml"
+      '';
+    };
+  };
+}

src/Main.qml

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+import App
+import QtQuick
+import QtQuick.Controls
+import QtQuick.Layouts
+
+ApplicationWindow {
+    id: root
+    width: 1000; height: 650
+    visible: true
+    title: "Application"
+
+    Label {
+        text: "Application"
+        anchors.centerIn: parent        
+    }
+}

src/main.cpp

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+#include <QGuiApplication>
+#include <QQmlApplicationEngine>
+#include <qcoreapplication.h>
+
+int main(int argc, char *argv[])
+{
+    QGuiApplication app(argc, argv);
+    QCoreApplication::setOrganizationName("hexstudios");
+    QCoreApplication::setApplicationName("dndtool");
+
+    QQmlApplicationEngine engine;
+    QObject::connect(
+        &engine, &QQmlApplicationEngine::objectCreationFailed,
+        &app, []() { QCoreApplication::exit(-1); },
+        Qt::QueuedConnection);
+
+    engine.loadFromModule("App", "Main");
+
+    return app.exec();
+}