PoE2 Window manipulator

Form1.cs

using System.Diagnostics;
using System.Runtime.InteropServices;

namespace PoE2WindowManip;

public struct Conf {
    public int X;
    public int Y;
    public int W;
    public int H;
    public bool B;
}

public partial class Form1 : Form {

    [DllImport("User32.dll", SetLastError = true)] 
    private static extern bool SetWindowPos(IntPtr hWnd, IntPtr hWndInsertAfter, int X, int Y, int cx, int cy, uint uFlags);

    [DllImport("User32.dll", SetLastError = true)] 
    private static extern int SetWindowLong(IntPtr hWnd, int nIndex, int dwNewLong); [DllImport("User32.dll", SetLastError = true)]
    private static extern int GetWindowLong(IntPtr hWnd, int nIndex);

    private int _defaultStyle = -1, _defaultExStyle = -1;

    const int GWL_STYLE = -16; 
    const int GWL_EXSTYLE = -20; 
    const int WS_BORDER = 0x00800000; 
    const int WS_DLGFRAME = 0x00400000; 
    const int WS_CAPTION = WS_BORDER | WS_DLGFRAME; 
    const int WS_SYSMENU = 0x00080000; 
    const int WS_MINIMIZEBOX = 0x00020000; 
    const int WS_MAXIMIZEBOX = 0x00010000; 
    const int WS_THICKFRAME = 0x00040000; 
    const int WS_EX_DLGMODALFRAME = 0x00000001; 
    const int WS_EX_CLIENTEDGE = 0x00000200;
    const int WS_EX_STATICEDGE = 0x00020000;

    private Conf _config;

    public Form1() {
        InitializeComponent();

        if(File.Exists("config")) {
            var cfg = File.ReadAllText("config");
            var cfgp = cfg.Split(',');
            _config = new Conf() {
                X = int.Parse(cfgp[0]),
                Y = int.Parse(cfgp[1]),
                W = int.Parse(cfgp[2]),
                H = int.Parse(cfgp[3]),
                B = bool.Parse(cfgp[4])
            };

            numX.Value = _config.X;
            numY.Value = _config.Y;
            numW.Value = _config.W;
            numH.Value = _config.H;
            cbBorderless.Checked = _config.B;

        }
    }

    private void btnApply_Click(object sender, EventArgs e) {
        _config.X = (int)numX.Value;
        _config.Y = (int)numY.Value;
        _config.W = (int)numW.Value;
        _config.H = (int)numH.Value;
        _config.B = cbBorderless.Checked;
        File.WriteAllText("config", $"{_config.X},{_config.Y},{_config.W},{_config.H},{_config.B}");

        Process? poeProc = null;

        foreach(var p in Process.GetProcesses()) {
            if (p.ProcessName.Contains("path", StringComparison.CurrentCultureIgnoreCase)) {
                poeProc = p;
                break;
            }
        }

        if (poeProc == null) {
            MessageBox.Show("Failed to locate poe process", "Error", MessageBoxButtons.OK, MessageBoxIcon.Error);
            return;
        }

        var poeHwnd = poeProc.MainWindowHandle;

        if(poeHwnd == IntPtr.Zero) {
            MessageBox.Show("Failed to locate poe window", "Error", MessageBoxButtons.OK, MessageBoxIcon.Error);
            return;
        }

        if (_defaultStyle == -1) {
            _defaultStyle = GetWindowLong(poeHwnd, GWL_STYLE);
            _defaultExStyle = GetWindowLong(poeHwnd, GWL_EXSTYLE);
        }

        if(cbBorderless.Checked) {

            var style = GetWindowLong(poeHwnd, GWL_STYLE);
            var exStyle = GetWindowLong(poeHwnd, GWL_STYLE);

            style &= ~(WS_CAPTION | WS_SYSMENU | WS_MINIMIZEBOX | WS_MAXIMIZEBOX | WS_THICKFRAME); 
            exStyle &= ~(WS_EX_DLGMODALFRAME | WS_EX_CLIENTEDGE | WS_EX_STATICEDGE);

            SetWindowLong(poeHwnd, GWL_STYLE, style); 
            SetWindowLong(poeHwnd, GWL_EXSTYLE, exStyle);

        } else {
            SetWindowLong(poeHwnd, GWL_STYLE, _defaultStyle);
            SetWindowLong(poeHwnd, GWL_EXSTYLE, _defaultExStyle);
        }
        

        SetWindowPos(poeHwnd, IntPtr.Zero, (int)numX.Value, (int)numY.Value, (int)numW.Value, (int)numH.Value, 0x0027);
    }
}

Form1.Designer.cs

namespace PoE2WindowManip;

partial class Form1 {
    /// <summary>
    ///  Required designer variable.
    /// </summary>
    private System.ComponentModel.IContainer components = null;

    /// <summary>
    ///  Clean up any resources being used.
    /// </summary>
    /// <param name="disposing">true if managed resources should be disposed; otherwise, false.</param>
    protected override void Dispose(bool disposing) {
        if (disposing && (components != null)) {
            components.Dispose();
        }
        base.Dispose(disposing);
    }

    #region Windows Form Designer generated code

    /// <summary>
    ///  Required method for Designer support - do not modify
    ///  the contents of this method with the code editor.
    /// </summary>
    private void InitializeComponent() {
        numW = new NumericUpDown();
        label1 = new Label();
        label2 = new Label();
        numH = new NumericUpDown();
        label3 = new Label();
        numY = new NumericUpDown();
        label4 = new Label();
        numX = new NumericUpDown();
        cbBorderless = new CheckBox();
        btnApply = new Button();
        ((System.ComponentModel.ISupportInitialize)numW).BeginInit();
        ((System.ComponentModel.ISupportInitialize)numH).BeginInit();
        ((System.ComponentModel.ISupportInitialize)numY).BeginInit();
        ((System.ComponentModel.ISupportInitialize)numX).BeginInit();
        SuspendLayout();
        // 
        // numW
        // 
        numW.Location = new Point(109, 102);
        numW.Maximum = new decimal(new int[] { 10000, 0, 0, 0 });
        numW.Name = "numW";
        numW.Size = new Size(240, 39);
        numW.TabIndex = 0;
        // 
        // label1
        // 
        label1.AutoSize = true;
        label1.Location = new Point(11, 104);
        label1.Name = "label1";
        label1.Size = new Size(78, 32);
        label1.TabIndex = 1;
        label1.Text = "Width";
        // 
        // label2
        // 
        label2.AutoSize = true;
        label2.Location = new Point(11, 149);
        label2.Name = "label2";
        label2.Size = new Size(86, 32);
        label2.TabIndex = 3;
        label2.Text = "Height";
        // 
        // numH
        // 
        numH.Location = new Point(109, 147);
        numH.Maximum = new decimal(new int[] { 10000, 0, 0, 0 });
        numH.Name = "numH";
        numH.Size = new Size(240, 39);
        numH.TabIndex = 2;
        // 
        // label3
        // 
        label3.AutoSize = true;
        label3.Location = new Point(11, 59);
        label3.Name = "label3";
        label3.Size = new Size(27, 32);
        label3.TabIndex = 7;
        label3.Text = "Y";
        // 
        // numY
        // 
        numY.Location = new Point(109, 57);
        numY.Name = "numY";
        numY.Size = new Size(240, 39);
        numY.TabIndex = 6;
        // 
        // label4
        // 
        label4.AutoSize = true;
        label4.Location = new Point(11, 14);
        label4.Name = "label4";
        label4.Size = new Size(28, 32);
        label4.TabIndex = 5;
        label4.Text = "X";
        // 
        // numX
        // 
        numX.Location = new Point(109, 12);
        numX.Name = "numX";
        numX.Size = new Size(240, 39);
        numX.TabIndex = 4;
        // 
        // cbBorderless
        // 
        cbBorderless.AutoSize = true;
        cbBorderless.CheckAlign = ContentAlignment.MiddleRight;
        cbBorderless.Location = new Point(11, 198);
        cbBorderless.Name = "cbBorderless";
        cbBorderless.Size = new Size(156, 36);
        cbBorderless.TabIndex = 8;
        cbBorderless.Text = "Borderless";
        cbBorderless.UseVisualStyleBackColor = true;
        // 
        // btnApply
        // 
        btnApply.Location = new Point(199, 192);
        btnApply.Name = "btnApply";
        btnApply.Size = new Size(150, 46);
        btnApply.TabIndex = 9;
        btnApply.Text = "Apply";
        btnApply.UseVisualStyleBackColor = true;
        btnApply.Click += btnApply_Click;
        // 
        // Form1
        // 
        AutoScaleDimensions = new SizeF(13F, 32F);
        AutoScaleMode = AutoScaleMode.Font;
        ClientSize = new Size(361, 255);
        Controls.Add(btnApply);
        Controls.Add(cbBorderless);
        Controls.Add(label3);
        Controls.Add(numY);
        Controls.Add(label4);
        Controls.Add(numX);
        Controls.Add(label2);
        Controls.Add(numH);
        Controls.Add(label1);
        Controls.Add(numW);
        Name = "Form1";
        Text = "Form1";
        ((System.ComponentModel.ISupportInitialize)numW).EndInit();
        ((System.ComponentModel.ISupportInitialize)numH).EndInit();
        ((System.ComponentModel.ISupportInitialize)numY).EndInit();
        ((System.ComponentModel.ISupportInitialize)numX).EndInit();
        ResumeLayout(false);
        PerformLayout();
    }

    #endregion

    private NumericUpDown numW;
    private Label label1;
    private Label label2;
    private NumericUpDown numH;
    private Label label3;
    private NumericUpDown numY;
    private Label label4;
    private NumericUpDown numX;
    private CheckBox cbBorderless;
    private Button btnApply;
}