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Thread: [RESOLVED] cDownload on Vista (vbRichClient5)

  1. #1

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    Resolved [RESOLVED] cDownload on Vista (vbRichClient5)

    Hello,
    I want to download a file (History.txt) from my github and process it to let the user know if an update is available.
    I use this code (taken form some Olaf's example):


    Code:
        Dim Downloads As cDownloads, D As cDownload
     
        URL = "https://miorsoft.github.io/Site/PhotoModularFX/History.txt"
    
        Set Downloads = New_c.Downloads
    
        Set D = Downloads.Download(URL)
      
        D.WaitForCompletion 5     '3 '<- 3 seconds timeout, until we cancel the http-Request
    
        If D.DownloadCompleted And D.GetContentLen > 0 Then
    
            'If MainFSO.FolderExists(APP.Path & "\Update") = False Then
            'MainFSO.CreateDirectory (APP.Path & "\Update")
            'End If
    
    
            If MainFSO.FileExists(APP.Path & "\Update") Then MainFSO.DeleteFile APP.Path & "\Update"
    
            D.SaveContentBytesToFile APP.Path & "\Update"
    
            F = MainFSO.ReadTextContent(APP.Path & "\Update")
            ...
            'ELABORATE "F"  and let user kbow about updates
            ...
        Else
            MsgBox "TimeOut  " & D.DownloadErrorStatusString
    
        End If
    In Windows7(32) it works,
    but in WindowsVista(32) it do Not work

    D.DownloadErrorStatusString is "Resource Not Found"

    "WaitForCompletion" seems to be skipped. Since in IDE it's executed instantly.

    Maybe it's not about Windows Operative System, but about the type of Internet connection .... I do not know.

  2. #2
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    Re: cDownload on Vista (vbRichClient5)

    There is an issue with modern SSL-certificates, which can cause problems on older machines
    (running XP or Vista) because they don't have the matching Crypto-extensions (which Systems > Vista usually have).

    Normally (on XP but also on Vista) there were System-Updates (as e.g. latest IE8 for XP or IE9 for Vista, but also Crypto-related ones),
    which install newer Crypto-libs on the OS.

    E.g. on an XP-VM which I tried to keep up-to-date (until support ran out), I don't get your Error.
    (don't have a VISTA-VM here to check).

    But on a quite old (non-updated) XP-VM which did not have IE8 installed - and no patches applied, I was able to reproduce the problem...

    And even when trying to hand over an URL which does not specify the secure protocol, but only "http://" instead,
    it will often not help, because many sites enforce (over a redirect-response) to reload with https instead.

    Here is the (slightly changed) code, which I've ran on that failing XP-machine (using cDownloads WithEvents, to get some more info):
    Code:
    Option Explicit
    
    Private WithEvents Downloads As cDownloads
    
    Private Sub Downloads_DownloadProgress(DownloadObj As vbRichClient5.cDownload, ByVal Percent As Single, ByVal StatusCode As Long, StatusDescription As String, StatusValue As String)
      Debug.Print StatusCode, StatusDescription, StatusValue
    End Sub
    
    Private Sub Form_Load()
      Set Downloads = New_c.Downloads
      MsgBox DownloadHistory
    End Sub
    
    Private Function DownloadHistory() As String
      Const URL = "http://miorsoft.github.io/Site/PhotoModularFX/History.txt"
      Dim D As cDownload
      Set D = Downloads.Download(URL)
    
      If Not D.WaitForCompletion(5) Then ' timeout-seconds, until we cancel the http-Request
         DownloadHistory = "TimeOut: " & D.DownloadErrorStatusString
         Exit Function
      End If
      
      If D.DownloadErrorStatus = 0 And D.GetContentLen > 0 Then
         DownloadHistory = StrConv(D.GetContentData, vbUnicode)
      Else
         DownloadHistory = "Error: " & D.DownloadErrorStatusString
      End If
    End Function
    Running the above on the failing XP-machine in question did print out:
    Code:
     1            Finding resource            miorsoft.github.io
     2            Connecting    151.101.113.147
     11           Sending request             
     3            Redirecting   https://miorsoft.github.io/Site/PhotoModularFX/History.txt
     2            Connecting    151.101.113.147
     2            Connecting    151.101.113.147
    What you could try on your VISTA-machine is either:
    - to update to a recent IE (not sure, whether there is somehing higher avail. for Vista than IE9) and to get "as many Updates as are still available"
    - or to use the WInHttp-5.1 Object with the SSL-Error-Ignore Option (see Code below)

    Code:
    Private Function DownloadHistory2() As String
      Const URL = "https://miorsoft.github.io/Site/PhotoModularFX/History.txt"
      Dim http As New WinHttp.WinHttpRequest
          http.Open "GET", URL, True
          http.Option(WinHttpRequestOption_SslErrorIgnoreFlags) = SslErrorFlag_Ignore_All
          http.Option(WinHttpRequestOption_SecureProtocols) = &HA8
          http.Send
       If Not http.WaitForResponse(5) Then ' timeout-seconds, until we cancel the http-Request
         DownloadHistory2 = "TimeOut: " & http.StatusText
         Exit Function
       End If
      
       If http.Status = 200 Then
         DownloadHistory2 = StrConv(http.ResponseBody, vbUnicode)
       Else
         DownloadHistory2 = "Error: " & http.StatusText
       End If
    End Function
    The MS-WinHttp-Object is the better choice for your case anyways, because it "guarantees no re-usage of cached responses".
    (it is always trying to do a real server-roundtrip, retrieving fresh content - which I assume is, what you want).

    The RC5-cDownload-Object is using the Systems URL-Cache - and should only be used for Downloads of relative static content (as e.g. Image-Resources or something).

    HTH

    Olaf

  3. #3
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    Re: cDownload on Vista (vbRichClient5)

    trying to redo my XP VM, and slipstream all the latest available updates (since 2014) is a pain. There's also a registry hack marking your OS as an embedded POS system, to get the last security updates until 2019. If anyone has any tips let me know.
    I'm almost ready to ditch supporting this OS.
    Imagine what it would be like to set breakpoints in, or step through subclassing code;
    and then being able to hit stop/end/debug or continue, without crashing the IDE.

    VB6.tlb | Bulletproof Subclassing in the IDE (no thunks/assembly/DEP issues)

  4. #4

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    Re: cDownload on Vista (vbRichClient5)

    Thanks!

  5. #5

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    Re: cDownload on Vista (vbRichClient5)

    using the WInHttp-5.1 Object as in your example
    Crashes if there is no internet connection at line

    Code:
     If Not http.WaitForResponse(5) Then
    Name:  http.error.jpg
Views: 324
Size:  11.9 KB

    "0x80072EE7 -2147012889 ERROR_INTERNET_NAME_NOT_RESOLVED The server name could not be resolved."
    Last edited by reexre; Jan 29th, 2018 at 04:02 AM.

  6. #6
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    Re: cDownload on Vista (vbRichClient5)

    Then either check if there is an internet connection before calling the code or trap the error.

  7. #7

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    Re: cDownload on Vista (vbRichClient5)

    Quote Originally Posted by Arnoutdv View Post
    Then either check if there is an internet connection before calling the code or trap the error.
    I thought there was another way.
    I took your advice.
    done

  8. #8

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    Re: [RESOLVED] cDownload on Vista (vbRichClient5)

    I'd like to know if there could be some App-deployment problem using:

    Private Declare Function URLDownloadToFile Lib "urlmon" _
    Alias "URLDownloadToFileA"


    as in this example

    instead of using WinHttp-5.1 Object

  9. #9
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    Re: [RESOLVED] cDownload on Vista (vbRichClient5)

    Quote Originally Posted by reexre View Post
    instead of using WinHttp-5.1 Object
    You also do not need to deploy the WinHttp 5.1..., is there something wrong with it on your end?

    Olaf

  10. #10

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    Re: [RESOLVED] cDownload on Vista (vbRichClient5)

    Quote Originally Posted by Schmidt View Post
    You also do not need to deploy the WinHttp 5.1..., is there something wrong with it on your end?
    Olaf
    on Windows7

    (before it worked, but today)
    Yes gives me error
    Error Code -2147012867
    while "urlmon" works
    Last edited by reexre; Feb 15th, 2018 at 04:16 PM.

  11. #11
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    Re: [RESOLVED] cDownload on Vista (vbRichClient5)

    Quote Originally Posted by reexre View Post
    Yes , before it worked, and today it gives me error ( ON WINDOWS 7 )
    So I changed the code and used "urlmon" that worked perfectly.
    As said - UrlMon works with caching (whilst WinHttp does not) - so, when you check for version-changes by
    downloading a file (with a constant name) you've put on the WebServer, you might not detect a version-switch on the client-PC,
    when the UrlMon-API has served you the "locally cached" version instead.

    And the DownloadHistory2-Routine I've put into post #3 currently only reports "http-Protocol-Errors" directly...
    (I'm more used to writing Library-Code, not Application-Code - and thus rarely put "Extra-Error-Handlers" into my Routines,
    because catching those, is IMO the responsibility of the App-Code).

    To report also "general errors" which could happen directly on the Http-Class-Instance due to:
    - ServerName not resolvable
    - wrong typed URL
    - Internet (or Router) down
    - connection-loss due to a "WLAN-hickup" or something
    ...then you need to wrap the routine (e.g in your timer which does the cyclic polling)
    with an additional (normal VB6-) Error-Handler.

    I'd still say, that WinHttp is the thing you should use in your scenario.

    Olaf

  12. #12

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    Re: [RESOLVED] cDownload on Vista (vbRichClient5)

    About urlmon:
    Code:
       DownloadFile = URLDownloadToFile(0&, _
                                        sSourceUrl, _
                                        sLocalFile, _
                                        BINDF_GETNEWESTVERSION, _
                                        0&) = ERROR_SUCCESS
    For what I understand this flag should download Newest version (overwrite locally cached file)
    EDIT: Maybe I have to use DeleteUrlCacheEntry

    Using DownloadHistory2
    I added
    Code:
     On Error GoTo HandelError
    ...
    HandelError:
        MsgBox "Can't check for updates! " & _
                 vbCrLf & vbCrLf & "Error: " & Err.Number & vbCrLf & Err.Description, vbOKOnly, "Connection Error !"
    It gives me Error Code -2147012867

    - ServerName not resolvable
    - wrong typed URL
    - Internet (or Router) down
    - connection-loss due to a "WLAN-hickup" or something
    I checked the URL (it's exact the same used on "urlmon")
    .... And urlmon works ... so I'd Exclude
    - ServerName not resolvable
    - wrong typed URL
    - Internet (or Router) down

    Yes it's strange , becasue DownloadHistory2 at the beginning worked. Now not.
    Last edited by reexre; Feb 15th, 2018 at 05:18 PM.

  13. #13
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    Re: [RESOLVED] cDownload on Vista (vbRichClient5)

    Quote Originally Posted by reexre View Post
    Yes it's strange , becasue DownloadHistory2 at the beginning worked. Now not.
    Not sure how that can happen (perhaps you should show the exact code - and also your URL, so that I can test this myself).

    We have WinHttp in use in a whole lot of Apps and Services (on a lot of customer-machines and -servers)
    - and it is *very* robust whilst doing its work (also not touching the file-system at all).

    As for the URLMon-API - I've read a lot of threads (though in the past, maybe it's better now),
    that the "Force New Version"-Flags either had no effect, or caused Mem-Leaks - and of course still cluttered the Download-Cache.

    Stuff like it is discussed here, I mean:
    https://stackoverflow.com/questions/...n-as-a-service

    But as said, perhaps it is better now (the appropriate urlmon.dll should have been updated a lot by MS - even on Win7-systems, because it is used also by the IE),
    so if you feel more comfortable with the flat API - and your tests all work nicely (also on XP, in case some of your customers still use it) - why not...

    Olaf

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    Re: [RESOLVED] cDownload on Vista (vbRichClient5)

    The code I used is the same of your DownloadHistory2

    I made some tests by changing the URL:

    I notice:
    - WinHttp works with URLs different from "https://miorsoft.github.io/Site......"
    - "urlmon" instead works with any URLs

    Error is fired at this line
    Code:
        http.Send
        If Not http.WaitForResponse(5) Then
    So is it github server that somehow blocks WinHttp ? Only to me ? Can you try DownloadHistory2 with that URL ?
    Code:
    https://miorsoft.github.io/Site/PhotoModularFX/History.txt

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    Re: [RESOLVED] cDownload on Vista (vbRichClient5)

    some code:
    WinHTTP
    Code:
    Private Function DownloadHistory2() As String
      Const url = "https://miorsoft.github.io/Site/PhotoModularFX/History.txt"
    
     ' On Error GoTo HandelError
        Dim http    As New WinHttp.WinHttpRequest
        http.Open "GET", url, True
        http.Option(WinHttpRequestOption_SslErrorIgnoreFlags) = SslErrorFlag_Ignore_All
        http.Option(WinHttpRequestOption_SecureProtocols) = &HA8
        http.Send
        If Not http.WaitForResponse(5) Then    ' timeout-seconds, until we cancel the http-Request
            DownloadHistory2 = "TimeOut: " & http.StatusText
            Exit Function
        End If
    
        If http.Status = 200 Then
            DownloadHistory2 = StrConv(http.ResponseBody, vbUnicode)
        Else
            DownloadHistory2 = "Error: " & http.StatusText
        End If
    
        Exit Function
    
    HandelError:
    
    End Function
    URLMON
    Code:
    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 Declare Function DeleteUrlCacheEntry Lib "Wininet.dll" _
                                                 Alias "DeleteUrlCacheEntryA" _
                                                 (ByVal lpszUrlName As String) As Long
    
    Private Const ERROR_SUCCESS As Long = 0
    Private Const BINDF_GETNEWESTVERSION As Long = &H10
    Private Const INTERNET_FLAG_RELOAD As Long = &H80000000
    
    Private Function DownloadHistory3() As String
        Const url = "https://miorsoft.github.io/Site/PhotoModularFX/History.txt"
       
        Dim handle  As Long
    
        Dim SaveTo  As String
    
        SaveTo = APP.Path & "\NewHistory.txt"
    
        If DownloadFile(url, SaveTo) Then
            handle = FreeFile
            Open SaveTo For Input As #handle
            DownloadHistory3 = Input$(LOF(handle), handle)
            Close #handle
            Kill SaveTo
        End If
    
    End Function
    
    Public Function DownloadFile(sSourceUrl As String, sLocalFile As String) As Boolean
        DeleteUrlCacheEntry sSourceUrl
        DownloadFile = URLDownloadToFile(0&, sSourceUrl, sLocalFile, BINDF_GETNEWESTVERSION, 0&) = ERROR_SUCCESS
    End Function

  16. #16
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    Re: [RESOLVED] cDownload on Vista (vbRichClient5)

    The workaround with the lowered SSL-requirements is only necessary on XP,
    so you should wrap the two lines which do that, with an appropriate condition as e.g.:

    Code:
    Private Function DownloadHistory2() As String
      Const url = "https://miorsoft.github.io/Site/PhotoModularFX/History.txt"
    
      On Error GoTo 1
        Dim http As New WinHttp.WinHttpRequest
        http.Open "GET", url, False
        
        If Not New_c.IsVistaPlus Then '<- lower the SSL-requirements only for XP
          http.Option(WinHttpRequestOption_SslErrorIgnoreFlags) = SslErrorFlag_Ignore_All
          http.Option(WinHttpRequestOption_SecureProtocols) = &HA8
        End If
        
        http.Send
        
        If Not http.WaitForResponse(5) Then ' timeout-seconds, until we cancel the http-Request
            DownloadHistory2 = "TimeOut: " & http.StatusText
            Exit Function
        End If
    
        If http.Status = 200 Then
            DownloadHistory2 = StrConv(http.ResponseBody, vbUnicode)
        Else
            DownloadHistory2 = "Error: " & http.StatusText
        End If
    
    1   If Err Then DownloadHistory2 = "Error: " & Err.Description
    End Function
    Olaf

  17. #17

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    Re: [RESOLVED] cDownload on Vista (vbRichClient5)

    thanks Olaf... but still in trouble.
    Before the error was -2147012867
    Now, with your last Olaf function (above) the error is:
    Error: Errore nel supporto per il canale di protezione
    -2147012739
    (an error occurred in secure channel support)
    raised by Send

    by the way , I suppose these errors happen only to me... to you it works, right?

    WINDOWS7
    Last edited by reexre; Feb 16th, 2018 at 11:38 AM.

  18. #18

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    Re: [RESOLVED] cDownload on Vista (vbRichClient5)

    I FOUND SOLUTION !!!

    https://support.microsoft.com/en-us/...e-protocols-in

    Using the Easy Fix

    Now I had another question:

    Once user find an update
    How to download it from a link (https://miorsoft.github.io/Site/Phot...oModularFX.zip) using winhttp ?

    EDIT:
    I got it:
    Code:
    If http.Status = 200 Then
            F = FreeFile
            Open sLocalFile For Binary Access Write As F
            Put #F, , http.ResponseBody
            Close F
            DownloadFile = True
    
        Else
    Last edited by reexre; Feb 16th, 2018 at 04:31 PM.

  19. #19

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    Re: [RESOLVED] cDownload on Vista (vbRichClient5)

    noooo

    on vista it gives error - -2147012721 "Protecion Error"

    using last DownloadHistory2 Post#16

    Please can someone download the ZIP and test by pressing "U" button ? Please
    Last edited by reexre; Feb 23rd, 2018 at 07:30 AM.

  20. #20
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    Re: [RESOLVED] cDownload on Vista (vbRichClient5)

    Quote Originally Posted by reexre View Post
    on vista it gives error - -2147012721 "Protecion Error"
    That's just another SSL-error (probably coming from an un-maintained, IE-wise not updated machine).

    Well, you can try to move:

    Code:
        http.Option(WinHttpRequestOption_SslErrorIgnoreFlags) = SslErrorFlag_Ignore_All
    ...out of the "XP-specific" conditional block - and place it before the If-condition
    (since it's really only the second SSL-specific setting, which makes problems on newer systems IIRC).

    That said, ... in your shoes - for the few unmaintained machines where these https-requests might "still fail",
    I'd simply "count" the errors - and store the counter somewhere in a DB - and after more than 10 failed
    attempts or so, I would show a Message on startup (that this machine is "unable to check for newer versions"
    (due to "non-up-to-date SSL-libs" on the system in question).

    The easiest way to update the SSL-stuff for such systems is IMO, to upgrade to IE11 (at least for Win7-machines).
    For Vista- or XP-machines they will have to find a servicepack (like you did already).

    Olaf

  21. #21

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    Re: [RESOLVED] cDownload on Vista (vbRichClient5)

    @Olaf
    on vista
    with http.Option(WinHttpRequestOption_SslErrorIgnoreFlags) = SslErrorFlag_Ignore_All
    Same error
    -2147012721
    adding even
    http.Option(WinHttpRequestOption_SecureProtocols) = &HA8
    error
    -2147012867

  22. #22

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    Re: [RESOLVED] cDownload on Vista (vbRichClient5)

    @Olaf
    on vista
    with http.Option(WinHttpRequestOption_SslErrorIgnoreFlags) = SslErrorFlag_Ignore_All
    Same error
    -2147012721
    0x80072F8F -2147012721 ERROR_INTERNET_SECURE_FAILURE ErrorClockWrong One or more errors were found in the Secure Sockets Layer (SSL) certificate sent by the server.


    adding even
    http.Option(WinHttpRequestOption_SecureProtocols) = &HA8
    error
    -2147012867
    0x80072EFD -2147012867 ERROR_INTERNET_CANNOT_CONNECT The attempt to connect to the server failed.

  23. #23
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    Re: [RESOLVED] cDownload on Vista (vbRichClient5)

    Quote Originally Posted by reexre View Post
    @Olaf
    on vista
    with http.Option(WinHttpRequestOption_SslErrorIgnoreFlags) = SslErrorFlag_Ignore_All
    Same error
    -2147012721
    0x80072F8F -2147012721 ERROR_INTERNET_SECURE_FAILURE ErrorClockWrong One or more errors were found in the Secure Sockets Layer (SSL) certificate sent by the server.
    Yes, that ErrorClockWrong -thingy is mentioned quite often (when you google for it), with regards to Vista-machines
    (which compare the time-frame-validity of a given SSL-cert wrongly).

    What I'm wondering is, why you don't avoid SSL-based https requests altogether (for the transfer of a simple Version- and Release-Info-file) -
    and just go with "direct http-requests".

    Whilst GitHub may always "force" an automatic https-based redirect, your own server (which you have IIRC, or could easily "rent" for a small fee per month),
    would not do so - so why not:
    - place the little file you want to transfer on your own WebServer
    - then performing these "cyclic version-checks" over http (using a new URL, which points to the proper place on your WebServer)

    Olaf

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    Re: [RESOLVED] cDownload on Vista (vbRichClient5)

    Quote Originally Posted by reexre View Post
    Please can someone download the ZIP and test by pressing "U" button ? Please
    ....

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    Re: [RESOLVED] cDownload on Vista (vbRichClient5)

    I've now done that - and it seems to work as it should (reporting the Version-Number)...

    Not sure though, what you were trying to accomplish with that test...


    Olaf

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    Re: [RESOLVED] cDownload on Vista (vbRichClient5)

    I wanted to know if in general (for most users) it worked.

    however, I came back, and for now, clicking the "U" button simply opens the web page. then user can visually check if he has the most up-to-date version.
    Last edited by reexre; Mar 1st, 2018 at 03:03 PM.

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    Re: [RESOLVED] cDownload on Vista (vbRichClient5)

    @Olaf
    Do you think it is possible that I get some problem using your VB6 Simple Async-Download-Ctl for multiple Files
    to download from HTTPS ?

    I'm focusing on using it
    Last edited by reexre; Mar 21st, 2018 at 01:45 PM.

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    Re: [RESOLVED] cDownload on Vista (vbRichClient5)

    WARNING!

    this question drove me crazy

    the main problem seems to be the url from which you want to download

    now, using AsyncRead, I noticed that:

    this url does not work https://miorsoft.github.io/Site/Phot...oModularFX.zip

    while this works https://raw.githubusercontent.com/mi...oModularFX.zip


    ... it seems to me that the above url also works with WinHttp.WinHttpRequest

    So for all those who want to download files from GITHUB I suggest using the RAW URL:
    https://raw.githubusercontent.com/......../

  29. #29
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    Re: [RESOLVED] cDownload on Vista (vbRichClient5)

    https on github.io is using TLS 1.2 only while raw.githubusercontent.com still supports TLS 1.0, 1.1 and 1.2 but this might change in the future too.

    Apparently github switched off the old protocols for some of their online properties on 23 Feb this year: https://blog.github.com/2018-02-23-w...dards-removed/

    cheers,
    </wqw>

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    Re: [RESOLVED] cDownload on Vista (vbRichClient5)

    Quote Originally Posted by reexre View Post
    Do you think it is possible that I get some problem using your VB6 Simple Async-Download-Ctl for multiple Files
    to download from HTTPS ?
    VBs built-in (UserControl-)AsyncRead-functionality is using the same (caching)-APIs under the covers,
    as the RC5-Classes cDownloads and cDownload.

    RC5.cDownloads can be declared WithEvents, and will then allow you to start and monitor "multiple downloads" as well...
    (then allowing, to implement something similar as the UserControl-based "MultiDownload-List" in a cwVList or some
    other Widgets, in case you prefer these kind of Controls in your already mostly "Widget-based" App)...

    As for the https-stuff - this could always fail on "older, not up-to-date Win-Systems" (for the reasons wqweto now pointed out as well).
    GitHub might change to newer TLS-algos in its serverside certificates at any time (also on the "Raw-URLs") -
    so, as said... to be on the safe side, you should consider "renting your own WebSite" for a small monthly fee,
    to have more control over either:
    - plain http-calls (which you do not force into a clientside-redirect, based on https)
    - or your own certificates which you use to enable https-requests on your site

    Olaf

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