Use of InternetReadFile

[Samy]

I am writing a small ftp program and have a question -

I realize there is a function called FtpGetFile but this does not allow for the monitoring of bytes recieved. If it does then I am not aware of how to use it.

I am trying to create a recieving progress bar. I already have the send progress bar and use InternetWriteFile to accomplish this. With InternetWriteFile I assumed I could use InternetReadFile in about the same way. Below is my current - non working - idea


Dim Data_A(99) As Byte
Dim Written As Long, szFileRemote As String, szFileLocal As String
Dim bDoLoop As Boolean

szFileRemote = List1.Text
szFileLocal = List1.Text

hFile = FtpOpenFile(hConnection, szFileRemote, &H40000000, dwType, 0)

If hFile = 0 Then
ErrorOut Err.LastDllError, "FtpOpenFile"
Exit Function
End If
Open szFileLocal For Binary As #1
bDoLoop = True
While bDoLoop
InternetReadFile hFile, Data_A(0), Len(Data_A(0)), Written
Put #1, , Left$(Data_A(0), Written)
If Not CBool(Written) Then bDoLoop = False
Wend

Close #1

InternetCloseHandle (hFile)

Please if someone could help me with this I would be very gracious.

Not sure if this'll help, but here is an example from the API-Guide (http://www.allapi.net) using the InternetReadFile API function.

Const scUserAgent = "API-Guide test program"
Const INTERNET_OPEN_TYPE_DIRECT = 1
Const INTERNET_OPEN_TYPE_PROXY = 3
Const INTERNET_FLAG_RELOAD = &H80000000
Const sURL = "http://www.microsoft.com/index.htm"
Private Declare Function InternetOpen Lib "wininet" Alias "InternetOpenA" (ByVal sAgent As String, ByVal lAccessType As Long, ByVal sProxyName As String, ByVal sProxyBypass As String, ByVal lFlags As Long) As Long
Private Declare Function InternetCloseHandle Lib "wininet" (ByVal hInet As Long) As Integer
Private Declare Function InternetReadFile Lib "wininet" (ByVal hFile As Long, ByVal sBuffer As String, ByVal lNumBytesToRead As Long, lNumberOfBytesRead As Long) As Integer
Private Declare Function InternetOpenUrl Lib "wininet" Alias "InternetOpenUrlA" (ByVal hInternetSession As Long, ByVal lpszUrl As String, ByVal lpszHeaders As String, ByVal dwHeadersLength As Long, ByVal dwFlags As Long, ByVal dwContext As Long) As Long
Private Sub Form_Load()
    'KPD-Team 1999
    'URL: http://www.allapi.net/
    'E-Mail: [email protected]
       
    Dim hOpen As Long, hFile As Long, sBuffer As String, Ret As Long
    'Create a buffer for the file we're going to download
    sBuffer = Space(1000)
    'Create an internet connection
    hOpen = InternetOpen(scUserAgent, INTERNET_OPEN_TYPE_DIRECT, vbNullString, vbNullString, 0)
    'Open the url
    hFile = InternetOpenUrl(hOpen, sURL, vbNullString, ByVal 0&, INTERNET_FLAG_RELOAD, ByVal 0&)
    'Read the first 1000 bytes of the file
    InternetReadFile hFile, sBuffer, 1000, Ret
    'clean up
    InternetCloseHandle hFile
    InternetCloseHandle hOpen
    'Show our file
    MsgBox sBuffer
End Sub

[cLocKwOrk]

Matthew, how do u avoid the program locking when the url u pass it doesn't resolve?

I have looked through loads of documentation and can't find anything to validate that the URL is available for connection.

Any ideas?