PowerShellでアプリケーションアイコンを作ってみる。

$outPath = "./output.ico"

$Bitmap = [System.Drawing.Bitmap]::new(64, 64, [System.Drawing.Imaging.PixelFormat]::Format24bppRgb)
$g = [System.Drawing.Graphics]::FromImage($Bitmap)
# 黒で塗りつぶし
$rect = [System.Drawing.Rectangle]::new(0, 0, 64, 64)
$g.FillRectangle([System.Drawing.Brushes]::Black, $rect);
# 文字を描く
$font = [System.Drawing.Font]::new("MS UI Gothic", 20);
$g.DrawString("あい", $font, [System.Drawing.Brushes]::White, 0, 2);
$g.DrawString("こん", $font, [System.Drawing.Brushes]::White, 12, 34);
$g.Dispose()

$icon = [System.Drawing.Icon]::FromHandle($Bitmap.GetHicon())
$fs = [System.IO.FileStream]::new($outPath, [System.IO.FileMode]::Create, [System.IO.FileAccess]::Write)
$icon.Save($fs)
$fs.Close()
$icon.Dispose()
$Bitmap.Dispose()

using System;
using System.Windows.Forms;

// csc IconTest.cs /win32icon:output.ico

class Form1 : Form
{
    [STAThread]
    static void Main()
    {
        Application.Run(new Form1());
    }
}