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ただひたすらに画像を開くだけのImageViewerをC#で作った

Last updated at Posted at 2018-08-03

画像を開くやつを作った

ただひたすらに画像を開き見るだけ
以下二つの起動パターンがある
・起動してからドラッグ&ドロップ
・画像の起動アプリケーションに指定(ダブルクリックで開けるようになる)

理由

・win10フォトの動作が異常に重いときがある(画像サイズに関係ない)
・ていうか画像見たいだけなのでほかの機能いらない
・画像の取り扱い方法をいろいろ調べてた

学び

・コマンドライン引数というものを知る
・Image機能強い
・身近なソフトウェアの簡単な改善は自分ですぐできる

設定とか

・FormのAllowDropをTrueに
・controlSizeChanger()のthis.width,heightパラメータをいじれば
最小のウィンドウサイズを変えられる

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace ImageViewer
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();

            Console.WriteLine(System.Environment.CommandLine);

            string filepath;

            //コマンドライン引数を配列で取得する
            string[] cmds = System.Environment.GetCommandLineArgs();
            //コマンドライン引数を列挙する
            if(cmds.Length >= 2)
            {
                filepath = cmds[1];

                System.Drawing.Image img = System.Drawing.Image.FromFile(filepath);

                controlSizeChanger();

                pictureBox1.Image = img;
            }
        }

        private void Form1_SizeChanged(object sender, EventArgs e)
        {
            this.pictureBox1.Width = this.Width;
            this.pictureBox1.Height = this.Height;

            this.panel1.Width = this.Width - 15;
            this.panel1.Height = this.Height - 37;
        }

        private void Form1_DragEnter(object sender, DragEventArgs e)
        {
            e.Effect = DragDropEffects.All;
        }

        private void Form1_DragDrop(object sender, DragEventArgs e)
        {
            if (!e.Data.GetDataPresent(DataFormats.FileDrop)) return;

            foreach(var filepath in (string[])e.Data.GetData(DataFormats.FileDrop))
            {
                System.Drawing.Image img = Image.FromFile(filepath);
                this.pictureBox1.Image = img;

                controlSizeChanger();
            }
        }

        private void controlSizeChanger()
        {
            this.Width = 700;
            this.Height = 800;

            this.pictureBox1.Width = this.Width;
            this.pictureBox1.Height = this.Height;

            this.panel1.Width = this.Width - 15;
            this.panel1.Height = this.Height - 37;
        }
    }
}

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