vbs 多线程下载实现代码

 
'by wankoilz 

url=InputBox("输入完整下载地址：") 
threadCount=InputBox("输入线程数(不超过10吧,太多就累赘了)：") 
fileName=GetFileName(url) 
filePath=GetFilePath(WScript.ScriptFullName) 
Set ohttp=CreateObject("msxml2.xmlhttp") 
Set ado=CreateObject("adodb.stream") 
Set fso=CreateObject("scripting.filesystemobject") 
ado.Type=1 
ado.Mode=3 
ado.Open 
ohttp.open "Head",url,True 
ohttp.send 
Do While ohttp.readyState<>4 
WScript.Sleep 200 
Loop 
'获得文件大小 
fileSize=ohttp.getResponseHeader("Content-Length") 
ohttp.abort 
'创建一个和下载文件同样大小的临时文件,供下面ado分段重写 
fso.CreateTextFile(filePath&"TmpFile",True,False).Write(Space(fileSize)) 
ado.LoadFromFile(filePath&"TmpFile") 

blockSize=Fix(fileSize/threadCount):remainderSize=fileSize-threadCount*blockSize 
upbound=threadCount-1 
'定义包含msxml2.xmlhttp对象的数组,·成员数量便是线程数 
'直接 Dim 数组名(变量名) 是不行的，这里用Execute变通了一下 
Execute("Dim arrHttp("&upbound&")") 
For i=0 To UBound(arrHttp) 
startpos=i*blockSize 
endpos=(i+1)*blockSize-1 
If i=UBound(arrHttp) Then endpos=endpos+remainderSize 
Set arrHttp(i)=CreateObject("msxml2.xmlhttp") 
arrHttp(i).open "Get",url,True 
'分段下载 
arrHttp(i).setRequestHeader "Range","bytes="&startpos&"-"&endpos 
arrHttp(i).send 
Next 
Do 
WScript.Sleep 200 
For i=0 To UBound(arrHttp) 
If arrHttp(i).readystate=4 Then 
'每当一个线程下载完毕就将其写入临时文件的相应位置 
ado.Position=i*blockSize 
MsgBox "线程"&i&"下载完毕！" 
ado.Write arrHttp(i).responseBody 
arrHttp(i).abort 
complete=complete+1 
End If 
Next 
If complete=UBound(arrHttp)+1 Then Exit Do 
timeout=timeout+1 
If timeout=5*30 Then 
'根据文件大小设定 
MsgBox "30秒超时！" 
WScript.Quit 
End If 
Loop 
If fso.FileExists(filePath&fileName) Then fso.DeleteFile(filePath&fileName) 
fso.DeleteFile(filePath&"TmpFile") 
ado.SaveToFile(filePath&fileName) 
MsgBox "文件下载完毕！" 

Function GetFileName(url) 
arrTmp=Split(url,"/") 
GetFileName=arrTmp(UBound(arrTmp)) 
End Function 

Function GetFilePath(fullname) 
arrTmp=Split(fullname,"") 
For i=0 To UBound(arrTmp)-1 
GetFilePath=GetFilePath&arrTmp(i)&"" 
Next 
End Function 

 
//www.laike.net/images/logo.gif 

 
Dim IE 
Set IE = CreateObject("InternetExplorer.Application") 
IE.Navigate "about:blank" 
Set window = IE.Document.parentWindow 
id = window.setTimeout(GetRef("on_timeout"),3000,"VBScript") 
name = InputBox("Please enter your name","InputBox Timeout") 
window.clearTimeout id 
If name <> "" Then MsgBox "Hello," & name 
IE.Quit 

'By Demon 
'http://demon.tw 

Sub on_timeout() 
Dim WshShell 
set WshShell = CreateObject("wscript.Shell") 
WshShell.SendKeys "{ESC}" 
End Sub