import win.ui;
import godking.vlistEx;
import thread.works
/*DSG{{*/
var mainForm = win.form(text="aardio form";right=1031;bottom=551)
mainForm.add(
button={cls="button";text="停止下载";left=296;top=480;right=448;bottom=528;z=2};
button2={cls="button";text="开始下载";left=520;top=480;right=672;bottom=528;z=3};
vlist={cls="vlistEx";left=10;top=10;right=1024;bottom=464;db=1;dl=1;dr=1;dt=1;edge=1;transparent=1;z=1}
)
/*}}*/

var t = { fields={"序号","url","保存文件","下载进度"} };
for(i=1;50;1){
    ..table.push(t,{"序号"="[@rowindex]"});
}

mainForm.vlist.setTable(t,/*列标题*/,{scale=true,0.5,5,3,2}/*列宽*/,1/*对齐方式*/,/*字典转为数组*/,/*字符串转为Utf8*/,true/*是否克隆新表*/);
mainForm.vlist.fillParent();
..io.createDir("\down");

import thread.command
thread.command.instance().setinfo = function(row,v,url,file){
    if #url mainForm.vlist.setCellText(row,2,url);
    if #file mainForm.vlist.setCellText(row,3,file);
    mainForm.vlist.setCellText(row,4,v:0);
}

var work = thread.works(5,
    function(param) {
        if thread.var("stop").get() return ;
        import godking.http;
        import thread.command;
        thread.command.setinfo(param.index,"开始 "++param.index,param.url);
        var t,n={info = "超时或终止"},0;
        var callback = function(id,v,all,url,file){
            thread.command.setinfo(id,..math.round((v:0)*100/all,2)++"%",url,file);
            return thread.var("stop").get();
        }; 
        do{
            n++;
            if n>3 or thread.var("stop").get() break; // 下载失败重试，共3次后结束。
            _,_,t = godking.http({
                url = param.url; 
                callback = callback; 
                callbackID = param.index;
                file = "\down\QQ_"+param.index+".exe"; 
                fileResume = true; 
            })
        } while ( !t.success and t.info!=="下载被终止" )
        if t.success===true {
            thread.command.setinfo(param.index,"下载完毕",param.url,t.file);
        } elseif t.success===false {
            thread.command.setinfo(param.index,"下载失败:"++(t.info:"")++..math.round(t.downsize*100/t.allsize,2)++"%",param.url,t.file);
        } else {
           thread.command.setinfo(param.index,"下载失败:"++(t.info:""));
        }
        return ;
    } 
);
mainForm.show();

mainForm.button.oncommand = function(id,event){
	thread.var("stop").set(true);
}

mainForm.button2.oncommand = function(id,event){
	thread.var("stop").set(false);
	mainForm.vlist.setTable(t,/*列标题*/,{scale=true,0.5,5,3,2}/*列宽*/,1/*对齐方式*/,/*字典转为数组*/,/*字符串转为Utf8*/,true/*是否克隆新表*/);
	for(i=1;50;1){
		// ★★★★★ 需要特别注意的知识点：
		// 已添加的工作未执行完毕前，本循环会被打断，处于等待状态，直到works需要获取新工作时，再继续执行，给works添加新工作。
		// 所以，如果需要停止全部工作时，则不要再继续添加。
    	if thread.var("stop").get() return ;
    	work.push({index=i,url="https://dldir1.qq.com/qqfile/qq/QQNT/Windows/QQ_9.9.15_240902_x86_01.exe"});
	}
}

mainForm.onClose = function(hwnd,message,wParam,lParam){
    import process
    process().terminate();
} 

// 定时刷新虚表
mainForm.vlist.autoRedraw = false;
mainForm.setInterval( 
    function(){
        mainForm.vlist.redraw(true)
    },200
)

// 添加工作任务
mainForm.button2.oncommand()
	
win.loopMessage();

注意：

有些系统可能默认最大连接数为2，也就是最多同时下载两个。可以用下面的函数修改后在下载：

import godking.http;
godking.http.setMaxConnections(10)