using system;
using system.drawing;
using system.collections;
using system.componentmodel;
using system.windows.forms;
using system.data;
using system.net;
using system.io;
using system.threading;
namespace mygetcar
{
///
/// form1 的摘要说明。
///
public class form1 : system.windows.forms.form
{
private system.windows.forms.label label1;
private system.windows.forms.label label2;
private system.windows.forms.textbox srcaddress;
private system.windows.forms.textbox taraddress;
private system.windows.forms.statusbar statusbar;
private system.windows.forms.button start;
private webclient client = new webclient();
///
/// 必需的设计器变量。
///
private system.componentmodel.container components = null;
public form1()
{
//
// windows 窗体设计器支持所必需的
//
initializecomponent();
//
// todo: 在 initializecomponent 调用后添加任何构造函数代码
//
}
///
/// 清理所有正在使用的资源。
///
protected override void dispose( bool disposing )
{
if( disposing )
{
if (components != null)
{
components.dispose();
}
}
base.dispose( disposing );
}
#region windows form designer generated code
///
/// 设计器支持所需的方法 - 不要使用代码编辑器修改
/// 此方法的内容。
///
private void initializecomponent()
{
this.label1 = new system.windows.forms.label();
this.label2 = new system.windows.forms.label();
this.srcaddress = new system.windows.forms.textbox();
this.taraddress = new system.windows.forms.textbox();
this.statusbar = new system.windows.forms.statusbar();
this.start = new system.windows.forms.button();
this.button1 = new system.windows.forms.button();
this.suspendlayout();
//
// label1
//
this.label1.location = new system.drawing.point(8, 32);
this.label1.name = "label1";
this.label1.size = new system.drawing.size(72, 23);
this.label1.tabindex = 0;
this.label1.text = "文件地址：";
this.label1.textalign = system.drawing.contentalignment.middleright;
//
// label2
//
this.label2.location = new system.drawing.point(8, 72);
this.label2.name = "label2";
this.label2.size = new system.drawing.size(72, 23);
this.label2.tabindex = 1;
this.label2.text = "另存到：";
this.label2.textalign = system.drawing.contentalignment.middleright;
//
// srcaddress
//
this.srcaddress.location = new system.drawing.point(80, 32);
this.srcaddress.name = "srcaddress";
this.srcaddress.size = new system.drawing.size(216, 21);
this.srcaddress.tabindex = 2;
this.srcaddress.text = "";
//
// taraddress
//
this.taraddress.location = new system.drawing.point(80, 72);
this.taraddress.name = "taraddress";
this.taraddress.size = new system.drawing.size(216, 21);
this.taraddress.tabindex = 3;
this.taraddress.text = "";
//
// statusbar
//
this.statusbar.location = new system.drawing.point(0, 151);
this.statusbar.name = "statusbar";
this.statusbar.size = new system.drawing.size(312, 22);
this.statusbar.tabindex = 4;
//
// start
//
this.start.flatstyle = system.windows.forms.flatstyle.flat;
this.start.location = new system.drawing.point(216, 112);
this.start.name = "start";
this.start.size = new system.drawing.size(75, 24);
this.start.tabindex = 5;
this.start.text = "开始下载";
this.start.click += new system.eventhandler(this.start_click);
//
// form1
//
this.autoscalebasesize = new system.drawing.size(6, 14);
this.clientsize = new system.drawing.size(312, 173);
this.controls.add(this.button1);
this.controls.add(this.start);
this.controls.add(this.statusbar);
this.controls.add(this.taraddress);
this.controls.add(this.srcaddress);
this.controls.add(this.label2);
this.controls.add(this.label1);
this.maximizebox = false;
this.name = "form1";
this.text = "文件下载器";
this.resumelayout(false); }
#endregion
///
/// 应用程序的主入口点。
///
[stathread]
static void main()
{
application.run(new form1());
}
private void startdownload()
{
start.enabled = false;
string url = srcaddress.text;
int n = url.lastindexof("?");
string urladdress = url;
//string urladdress = url.substring(0,n);
string filename = url.substring(n+1,url.length-n-1);
string dir = taraddress.text;
string path = dir+filename;
try
{
webrequest myre=webrequest.create(urladdress);
}
catch(webexception exp)
{
messagebox.show(exp.message,"error");
}
try
{
statusbar.text = "开始下载文件...";
client.downloadfile(urladdress,filename);
stream str = client.openread(urladdress);
//streamreader reader = new streamreader(str); ,这句没有什么必要！个人认为
byte[] mbyte = new byte[100000];
int allmybyte = (int)mbyte.length;
int startmbyte = 0;
statusbar.text = "正在接收数据...";
//写入到byte数组中，起缓冲作用
while(allmybyte>0)
{
int m = str.read(mbyte,startmbyte,allmybyte);
if(m==0)
break;
startmbyte+=m;
allmybyte-=m;
}
filestream fstr = new filestream(path,filemode.openorcreate,fileaccess.write);
fstr.write(mbyte,0,startmbyte);
str.close();
fstr.close();
statusbar.text = "下载完毕！";
}
catch(webexception exp)
{
messagebox.show(exp.message,"error");
statusbar.text = "";
}
start.enabled = true;
}
private void start_click(object sender, system.eventargs e)
{
thread th = new thread(new threadstart(startdownload));
th.start();
}
}
}
