function dl(mainWindow, lang_path, base, dirname) {
	const electron = require("electron");
	const shell = electron.shell;
	const fs = require("fs");
	const { download } = require('electron-dl');
	const BrowserWindow = electron.BrowserWindow;
	const dialog = electron.dialog;
	var updatewin = null;
	var ipc = electron.ipcMain;
	const app = electron.app;
	const join = require('path').join;
	ipc.on('update', function (e, x, y) {

		var platform = process.platform;
		var bit = process.arch;
		if (platform != "others") {
			updatewin = new BrowserWindow({
				webPreferences: {
					webviewTag: false,
					nodeIntegration: false,
					contextIsolation: true,
					preload: join(dirname,"js", "platform", "preload.js")
				},
				width: 600,
				height: 400,
				"transparent": false, // ウィンドウの背景を透過
				"frame": false, // 枠の無いウィンドウ
				"resizable": false
			})
			var lang = fs.readFileSync(lang_path, 'utf8');
			updatewin.loadURL(base + lang + '/update.html');
			return "true"
		} else {
			return false;
		}
	})
	//アプデDL
	ipc.on('download-btn', (e, args) => {
		function dl(url, file, dir, e) {

			e.sender.webContents.send('mess', "ダウンロードを開始します。");
			const opts = {
				directory: dir,
				openFolderWhenDone: true,
				onProgress: function (event) {
					e.sender.webContents.send('prog', event);
				},
				saveAs: false
			};
			download(updatewin,
				url, opts)
				.then(dl => {
					e.sender.webContents.send('mess', "ダウンロードが完了しました。");
					app.quit();
				})
				.catch(console.error);
		}
		var platform = process.platform;
		var bit = process.arch;
		dialog.showSaveDialog(null, {
			title: 'Save',
			defaultPath: app.getPath('home') + "/" + args[1]
		}, (savedFiles) => {
			console.log(savedFiles);
			if (!savedFiles) {
				return false;
			}
			if (platform == "win32") {
				var m = savedFiles.match(/(.+)\\(.+)$/);
			} else {
				var m = savedFiles.match(/(.+)\/(.+)$/);
			}
			//console.log(m);
			if (isExistFile(savedFiles)) {
				fs.unlinkSync(savedFiles);
			}
			dl(args[0], args[1], m[1], e);
		});
	});

	function isExistFile(file) {
		try {
			fs.statSync(file);
			return true
		} catch (err) {
			if (err.code === 'ENOENT') return false
		}
	}


	ipc.on('general-dl', (event, args) => {

		var name = "";
		var platform = process.platform;
		var bit = process.arch;
		if (args[1] == "") {
			if (platform == "win32") {
				var dir = app.getPath('home') + "\\Pictures\\TheDesk";
			} else if (platform == "linux" || platform == "darwin") {
				var dir = app.getPath('home') + "/Pictures/TheDesk";
			}
		} else {
			var dir = args[1];
		}
		const opts = {
			directory: dir,
			filename: name,
			openFolderWhenDone: false,
			onProgress: function (e) {
				event.sender.webContents.send('general-dl-prog', e);
			},
			saveAs: false
		};
		download(BrowserWindow.getFocusedWindow(),
			args[0], opts)
			.then(dl => {
				event.sender.webContents.send('general-dl-message', dir);
			})
			.catch(console.error);
	});
	ipc.on('open-finder', (e, folder) => {

		shell.showItemInFolder(folder)
	});
}
exports.dl = dl;