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The URLDownloadToFile API is available on all versions of the Windows operating system (except Win3, WinNT3.x). By
passing the remote file name and the local file path and name, the API downloads the bits of the specified file saving them
as the target name. The function works with all file types - plain text, images, html, mpg, wav and zip files etc. without
modification to the routine or concern for the file being downloaded, nor is there any apparent size restriction or limitation.
The downloaded file can then be either opened and displayed in VB (as the illustration shows for a html file), or the path
and filename can be passed to ShellExecute or ShellExecuteEx for opening in the associated application. For multiple files
It downloads them one at a time, and the wrapper returns true if the download of each file was successful.
The pCaller member of the API is used to specify the address of the controlling IUnknown interface when the call is used
in an ActiveX controls. For use in an application, 0& (null) is passed.

This code is loosely based on a msnews newsgroup posting by Matthew Gates.


BAS Module Code
None.

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Form Code

Drop a command button (Command1) and a text box (Text1) onto a form and set the Multiline property to True. Add the
following code and change the remote URL to a valid file on a server, and the local file name to valid a valid folder on your
system:

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Option Explicit

Private 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

Private Const ERROR_SUCCESS As Long = 0

Private Sub Form_Load()
Command1.Caption = "Download File"
End Sub


Private Sub Command1_Click()

Dim sourceUrl As String
Dim targetFile As String
Dim hfile As Long

sourceUrl = "http://www.mvps.org/vbnet/faq/main/fileloadtext.htm"
targetFile = "c:\deleteme.htm"

Label1.Caption = sourceUrl
Label2.Caption = targetFile

If DownloadFile(sourceUrl, targetFile) Then

hfile = FreeFile
Open targetFile For Input As #hfile
Text1.Text = Input$(LOF(hfile), hfile)
Close #hfile

End If

End Sub


Public Function DownloadFile(ByVal sURL As String, _
ByVal sLocalFile As String) As Boolean

Dim lngRetVal As Long

'if the API returns ERROR_SUCCESS (0),
'return True from the function
DownloadFile = URLDownloadToFile(0&, _
sURL, _
sLocalFile, _
0&, _
0&) = ERROR_SUCCESS

End Function

 Downloading Files using URLDownloadToFile

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