vb进程保护，DLLAttribute VB_Name = "Module2"
Public Declare Function URLDownloadToFile Lib "urlmon" Alias "URLDownloadToFileA" (ByVal pCaller As Long, ByVal szURL As String, ByVal szFileName As String, ByVal dwReserved As Long, ByVal lpfnCB As Long) As Long
Public Declare Function DeleteUrlCacheEntry Lib "wininet" Alias "DeleteUrlCacheEntryA" (ByVal lpszUrlName As String) As Long
Public ops1() As String
Public Function DownloadFile(url As String, LocalFilename As String) As Boolean '下载文件
Dim lngRetVal As Long
lngRetVal = URLDownloadToFile(0, url, LocalFilename, 0, 0)
If lngRetVal = 0 Then
DownloadFile = True
DeleteUrlCacheEntry url '清除缓存
End If
End Function