URLDownloadToFile question

Hey All,

I found this code on one of the threads...

Code:

---

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 Function DownloadFile(URL As String, _
    LocalFilename As String) As Boolean
    Dim lngRetVal As Long
    lngRetVal = URLDownloadToFile(0, URL, LocalFilename, 0, 0)
    If lngRetVal = 0 Then DownloadFile = True
End Function

---

I was wondering if anyone could find any problem with changing
the last "IF" statement to something like the following...

Code:

---

If lngRetVal = 0 Then
  DownloadFile = True
  MsgBox "Download Complete!"
Else
  DownloadFile = False
  MsgBox "You are NOT Connected to the Internet!"
End If

---

Thanks in advance,
Ron

I see no problem with it. Have you tried it?

Greetings and Salutatiions!


Just wanted to drop a note to say thanks for the code sample. It was just what I was looking for.

Returns one of the following values:
Private Const E_OUTOFMEMORY As Long = &H8007000E
The buffer length is invalid or there was insufficient memory to complete the operation.
Private Const S_OK As Long = &H0
The operation succeeded.


URLDownloadToFile will only return a non-zero value only if it doesn't have enough memory to do what it needs to.

Try using InternetGetConnectedState to see if the user is online or not.

VB Code:

Private Const INTERNET_CONNECTION_CONFIGURED = &H40
Private Const INTERNET_CONNECTION_LAN = &H2
Private Const INTERNET_CONNECTION_MODEM = &H1
Private Const INTERNET_CONNECTION_OFFLINE = &H20
Private Const INTERNET_CONNECTION_PROXY = &H4
Private Const INTERNET_RAS_INSTALLED = &H10
Private Declare Function InternetGetConnectedState Lib "wininet.dll" (ByRef lpdwFlags As Long, ByVal dwReserved As Long) As Long
Private Sub Form_Load()
    'KPD-Team 2001
    'URL: [url]http://www.allapi.net/[/url]
    'E-Mail: [email][email protected][/email]
    Dim Ret As Long
    Me.AutoRedraw = True
    'retrieve the connection status
    InternetGetConnectedState Ret, 0&
    'show the result
    If (Ret And INTERNET_CONNECTION_CONFIGURED) = INTERNET_CONNECTION_CONFIGURED Then Me.Print "Local system has a valid connection to the Internet, but it may or may not be currently connected."
    If (Ret And INTERNET_CONNECTION_LAN) = INTERNET_CONNECTION_LAN Then Me.Print "Local system uses a local area network to connect to the Internet."
    If (Ret And INTERNET_CONNECTION_MODEM) = INTERNET_CONNECTION_MODEM Then Me.Print "Local system uses a modem to connect to the Internet."
    If (Ret And INTERNET_CONNECTION_OFFLINE) = INTERNET_CONNECTION_OFFLINE Then Me.Print "Local system is in offline mode."
    If (Ret And INTERNET_CONNECTION_PROXY) = INTERNET_CONNECTION_PROXY Then Me.Print "Local system uses a proxy server to connect to the Internet."
    If (Ret And INTERNET_RAS_INSTALLED) = INTERNET_RAS_INSTALLED Then Me.Print "Local system has RAS installed."
End Sub

Quote:

---

Originally posted by rdcody
Hey All,

I found this code on one of the threads...

Code:

---

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 Function DownloadFile(URL As String, _
    LocalFilename As String) As Boolean
    Dim lngRetVal As Long
    lngRetVal = URLDownloadToFile(0, URL, LocalFilename, 0, 0)
    If lngRetVal = 0 Then DownloadFile = True
End Function

---

I was wondering if anyone could find any problem with changing
the last "IF" statement to something like the following...

Code:

---

If lngRetVal = 0 Then
  DownloadFile = True
  MsgBox "Download Complete!"
Else
  DownloadFile = False
  MsgBox "You are NOT Connected to the Internet!"
End If

---

Thanks in advance,
Ron

---

The code is perfectly fine the way it is

VB Code:

If DownloadFile("http://www.vbforums.com/", "c:\a.txt") then
 Msgbox "Download Complete"
else
 Mesgbox "There was some kind of error"
End If