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Thread: Vb6: Winsock data arrival multiple packets

  1. #1

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    Vb6: Winsock data arrival multiple packets

    I am receiving a large request from a website, and data arrives in multiple parts. like on 2 parts
    how can i get data to textbox in one part?

    Private Sub winsock_DataArrival(ByVal bytesTotal As Long)
    Dim strResponse As String\
    winsock.GetData strResponse, vbString, bytesTotal
    strResponse = FormatLineEndings(strResponse)
    ' we append this to the response box becuase data arrives
    ' in multiple packets
    txtResponse.Text = txtResponse.Text & strResponse
    End sub

  2. #2
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    Re: Vb6: Winsock data arrival multiple packets

    You have to use a buffer, append the data to the buffer as it arrives then read the data from your buffer when the time is right. You can not get the data in one go when all of the data is not there yet, you have to buffer and wait which is basically what is being done above by appending it to the textbox but normally this would be done with a variable rather than a display control.

  3. #3

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    Re: Vb6: Winsock data arrival multiple packets

    Quote Originally Posted by DataMiser View Post
    You have to use a buffer, append the data to the buffer as it arrives then read the data from your buffer when the time is right. You can not get the data in one go when all of the data is not there yet, you have to buffer and wait which is basically what is being done above by appending it to the textbox but normally this would be done with a variable rather than a display control.
    please give me code to do it, i am a newbie
    thank you

  4. #4
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    Re: Vb6: Winsock data arrival multiple packets

    Try it, it is pretty simple and that is how you learn.

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    Re: Vb6: Winsock data arrival multiple packets

    Quote Originally Posted by DataMiser View Post
    Try it, it is pretty simple and that is how you learn.
    i told you i am a newbie i searched everywhere in goolge and couldnt find code
    how can write code when i am a newbie ?
    just say you dont want to help

  6. #6
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    Re: Vb6: Winsock data arrival multiple packets

    What is not working in your 1st post?
    Code:
    Private Sub winsock_DataArrival(ByVal bytesTotal As Long)
      Dim strResponse As String
      
      winsock.GetData strResponse, vbString, bytesTotal
      strResponse = FormatLineEndings(strResponse)
      ' we append this to the response box becuase data arrives
      ' in multiple packets
     txtResponse.Text = txtResponse.Text & strResponse
    End sub

  7. #7
    PowerPoster wqweto's Avatar
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    Re: Vb6: Winsock data arrival multiple packets

    This line

    txtResponse.Text = txtResponse.Text & strResponse

    . . . already appends to your buffer.

    > how can i get data to textbox in one part?

    So you want a single txtResponse.Text = m_sBuffer then you have to change above buffering code to

    m_sBuffer = m_sBuffer & strResponse

    . . . so that it appends to a member string variable m_sBuffer instead.

    The real problem is how to figure out when is the full response complete in the buffer? When are there no more chunks expected to arrive from the server?

    This depends on the network protocol used e.g. for http there is "Content-Length" header and its value has to be parsed when headers are received and then checked on each m_sBuffer = m_sBuffer & strResponse if buffer is full enough according "Content-Length" value.

    So for proper http protocol parsing you have to implement a simple state machine. First state is "receiving headers". Once there are two consequtive new-lines in m_sBuffer then parse "Content-Length" header value and change state to "receiving body". On data receive if Len(m_sBuffer) >= lContentLength + lHeadersLength then all is complete by assigning txtResponse.Text = m_sBuffer which is your original wish.

    Not very simple, not terribly complicated. Just interesting assignment for a junior dev.

    cheers,
    </wqw>

  8. #8

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    Re: Vb6: Winsock data arrival multiple packets

    Quote Originally Posted by wqweto View Post
    This line

    txtResponse.Text = txtResponse.Text & strResponse

    . . . already appends to your buffer.

    > how can i get data to textbox in one part?

    So you want a single txtResponse.Text = m_sBuffer then you have to change above buffering code to

    m_sBuffer = m_sBuffer & strResponse

    . . . so that it sppends to a member string variable m_sBuffer instead.

    The real problem is how to figure out when is the full response complete in the buffer? When are there no more chunks expected to arrive from the server?

    This depends on the network protocol used e.g. for http there is "Content-Length" header and its value has to be parsed when headers are received and then checked on each m_sBuffer = m_sBuffer & strResponse if buffer is full enough according "Content-Length" value.

    So for proper http protocol parsing you have to implement a simple state machine. First state is "receiving headers". Once there are two consequtive new-lines in m_sBuffer then parse "Content-Length" header value and change state to "receiving body". On data receive if Len(m_sBuffer) >= lContentLength + lHeadersLength then all is complete by assigning txtResponse.Text = m_sBuffer which is your original wish.

    Not very simple, not terribly complicated. Just interesting assignment for a junior dev.

    cheers,
    </wqw>
    i already thought about content lenght and i cant use it, because the website give different content each time, so content length is not fixed
    could you please help with the code? i have looked everywhere online and found nothing

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    Re: Vb6: Winsock data arrival multiple packets

    The answer is that you cannot unless you are able to understand the protocol. TCP is a stream that is sent to you in chunks as the network is able to transmit it. Unless you can come to an arrangement with the owner of the website to add some kind of length field at the beginning of the request there is no way for you to know when its done unless it closes the connection when its finished. If that is the case you could just buffer until you get a close event fires.

    The other complication to this is you will most likely receive a different amount of "messages" depending on the network (LAN/WAN/Other)

    In addition if the traffic is HTTPS you are screwed unless you can decode it and also have some length field at the beginning.

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    Re: Vb6: Winsock data arrival multiple packets

    Quote Originally Posted by vbwins View Post
    The answer is that you cannot unless you are able to understand the protocol. TCP is a stream that is sent to you in chunks as the network is able to transmit it. Unless you can come to an arrangement with the owner of the website to add some kind of length field at the beginning of the request there is no way for you to know when its done unless it closes the connection when its finished. If that is the case you could just buffer until you get a close event fires.

    The other complication to this is you will most likely receive a different amount of "messages" depending on the network (LAN/WAN/Other)

    In addition if the traffic is HTTPS you are screwed unless you can decode it and also have some length field at the beginning.
    im not convinced with what you telling me, i know the solution but im a newbie i dont know what code i should write
    i have to get all buffer to memory first and only then copy it to textbox, i tried this code but it showed error

    Private Sub tcpClient_DataArrival(ByVal bytesTotal As Long)
    ' determine the data type and process it

    ' get the buffer contents
    ReDim gbIOBuff(bytesTotal)
    tcpClient.GetData gbIOBuff, vbArray + vbByte, bytesTotal

    If copyPtr = 0 Then ' we are at the beginning of a new reply
    ' save size & type of reply
    CopyMemory recLen, gbIOBuff(0), 4
    recLen = ntohl(recLen)
    CopyMemory codeCheck, gbIOBuff(52), 2
    codeCheck = ntohs(codeCheck)
    ReDim gbReplyBuff(bytesTotal) ' clear old data record & start new one
    Else
    ReDim Preserve gbReplyBuff(copyPtr + bytesTotal) ' retain data & bump the size
    End If

    ' copy the received data to the work buffer at location referenced by copyptr
    CopyMemory gbReplyBuff(copyPtr), gbIOBuff(0), bytesTotal
    If UBound(gbReplyBuff) = recLen Then
    ' we got the entire record
    If recLen = gilocLen Or recLen = gijobLen Or recLen = giSockRtn Then
    If codeCheck = glLocRequest Then
    Process_Locations ' 1 time only at Form_Load
    Else
    If codeCheck = glJobRequest Then
    Process_JobStats
    Else
    Beep
    sbStatus.Panels(2).Text = "Error: " & codeCheck & ", No text returned"
    intTics = 0 ' reset display timer
    End If
    End If
    End If
    copyPtr = 0 ' reset the flag\pointer
    Else
    ' save the current record length\next copy location
    copyPtr = UBound(gbReplyBuff)
    End If

    End Sub

  11. #11
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    Re: Vb6: Winsock data arrival multiple packets

    Why all of this nonsense anyway?

    Ignoring the SSL/TLS issue (which can be hacked around with a ton of effort as some have done) almost everything you are struggling with is handled by existing HTTP classes like WinHttpRequest, or XMLHTTP, or even the crusty old ITC ("WinInet control").

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    Re: Vb6: Winsock data arrival multiple packets

    Quote Originally Posted by dilettante View Post
    Why all of this nonsense anyway?

    Ignoring the SSL/TLS issue (which can be hacked around with a ton of effort as some have done) almost everything you are struggling with is handled by existing HTTP classes like WinHttpRequest, or XMLHTTP, or even the crusty old ITC ("WinInet control").
    winhttp + xmlhttp + inet i tried all of them and they cant grab cookies
    only choice i have left is winsock bcoz only with winsock i could grab cookies

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    Re: Vb6: Winsock data arrival multiple packets

    Quote Originally Posted by dilettante View Post
    Ignoring the SSL/TLS issue (which can be hacked around with a ton of effort as some have done)
    Btw, there is no TLS 1.3 client built-in on latest Win10 and there is no TLS 1.2 client built-in on XP (and 2000/NT) which is why I would have to use a custom impl if need be.

    cheers,
    </wqw>

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    Re: Vb6: Winsock data arrival multiple packets

    Quote Originally Posted by dilettante View Post
    Why all of this nonsense anyway?

    Ignoring the SSL/TLS issue (which can be hacked around with a ton of effort as some have done) almost everything you are struggling with is handled by existing HTTP classes like WinHttpRequest, or XMLHTTP, or even the crusty old ITC ("WinInet control").
    winhttp + xmlhttp + inet i tried all of them and they cant grab cookies
    only choice i have left is winsock bcoz only with winsock i could grab cookies

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    Re: Vb6: Winsock data arrival multiple packets

    Quote Originally Posted by geekmaro View Post
    i told you i am a newbie i searched everywhere in goolge and couldnt find code
    how can write code when i am a newbie ?
    just say you dont want to help
    I did help, more than once already. I showed you how to append the text, I told you that normally you would use a buffer variable.
    I am not going to write the code for you so you can just paste it in, you learn nothing that way.

    As for how you write code as a newbie, you start by typing in some code, modifying examples, test and repeat until it works. This is how you learn to be a coder. If you do not want to put in some effort to learn to do it then you should forget about being a coder and look for something better suited to you.

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    Re: Vb6: Winsock data arrival multiple packets

    Quote Originally Posted by geekmaro View Post
    i already thought about content lenght and i cant use it, because the website give different content each time, so content length is not fixed
    could you please help with the code? i have looked everywhere online and found nothing
    That is why you read the content length from the header then you know what to expect. So it is not a matter of you can't use it it is a matter of you can't hard code it to some preset value you have to actually write a few lines of code to see what it is.

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    Re: Vb6: Winsock data arrival multiple packets

    Quote Originally Posted by wqweto View Post
    Btw, there is no TLS 1.3 client built-in on latest Win10
    Really?

    Well currently it is still considered "experimental" but you can still turn the option on in SChannel via "Internet Options."

    Name:  sshot.png
Views: 126
Size:  8.3 KB

    From all reports this should leave experimental status and be on by default in the next Win10 update (20H2) coming soon.

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    Vb6: Winsock get data fix ( i pay $200 to who can fix this)

    i want to grab all page source using winsock from this site: http://apache.org
    but problem is on data arrival event i get data on 2 parts
    i need to get all data at once into textbox
    i offer $200, can pay with any payment method you prefer; paypal, bitcoin etc..
    thank u all

  19. #19
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    Re: Vb6: Winsock get data fix ( i pay $200 to who can fix this)

    the API URLDownloadToFile is quite handy when grabbing files.
    what u need is the directory list of the page, if the http server is allowing browsing.
    if the page is generated or html, u can create a parser for that purpose. usually its all about looking at the html and check for "similarities" of the files you want to grab.

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    Re: Vb6: Winsock get data fix ( i pay $200 to who can fix this)

    Quote Originally Posted by baka View Post
    the API URLDownloadToFile is quite handy when grabbing files.
    what u need is the directory list of the page, if the http server is allowing browsing.
    if the page is generated or html, u can create a parser for that purpose. usually its all about looking at the html and check for "similarities" of the files you want to grab.
    already tried that didnt work
    need solution that use buffer to get all data first then paste it to textbox

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    Re: Vb6: Winsock get data fix ( i pay $200 to who can fix this)

    didnt work? I have a site-grabber program and I use this API.

    u want the page source of http://apache.org/? like index.html?
    or is it something else you want? maybe its not apache.org you want but a generic page downloader or a page that uses php?

  22. #22

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    Re: Vb6: Winsock get data fix ( i pay $200 to who can fix this)

    Quote Originally Posted by baka View Post
    didnt work? I have a site-grabber program and I use this API.

    u want the page source of http://apache.org/? like index.html?
    or is it something else you want? maybe its not apache.org you want but a generic page downloader or a page that uses php?
    i must use only winsock, no other control
    i dont need downloader, i only need to grab page source code to winsock using data arrival event

  23. #23
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    Re: Vb6: Winsock get data fix ( i pay $200 to who can fix this)

    that is very basic, you should show the code you are using and we could help you out what you did wrong.
    the importance is the handshake/header when you send the GET command so that the server will send you the whole page back.
    using URLDownloadToFile you will not need anything like that, just 1 line to grab the index.html and a vb6 open as input to get the data into the textbox.

  24. #24
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    Re: Vb6: Winsock get data fix ( i pay $200 to who can fix this)

    example:

    Code:
    Private Declare Function URLDownloadToFileA Lib "urlmon" (ByVal pCaller As Long, ByVal szURL As String, ByVal szFileName As String, ByVal dwReserved As Long, ByVal lpfnCB As Long) As Long
    
    Private Sub Form_Load()
        Dim ff%, sLocalFile$, Data() As Byte
        
        sLocalFile = App.Path & "\tmp.txt"
        Call URLDownloadToFileA(0&, "http://apache.org/index.html", sLocalFile, &H10, 0&)
        ff = FreeFile
        ReDim Data(0 To FileLen(sLocalFile) - 1)
        Open sLocalFile For Binary As #ff
            Get #ff, , Data
        Close #ff
        Text1.Text = StrConv(Data, vbUnicode)
    End Sub
    this will download the page source and put it in text1.text, remember to change text1 to MultiLine
    also textbox is limited how much it can show. so its not broken.
    use RichTextBox instead.
    Last edited by baka; Oct 10th, 2020 at 11:25 AM.

  25. #25

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    Re: Vb6: Winsock get data fix ( i pay $200 to who can fix this)

    Quote Originally Posted by baka View Post
    example:

    Code:
    Private Declare Function URLDownloadToFileA Lib "urlmon" (ByVal pCaller As Long, ByVal szURL As String, ByVal szFileName As String, ByVal dwReserved As Long, ByVal lpfnCB As Long) As Long
    
    Private Sub Form_Load()
        Dim ff%, sLocalFile$, Data() As Byte
        
        sLocalFile = App.Path & "\tmp.txt"
        Call URLDownloadToFileA(0&, "http://apache.org/index.html", sLocalFile, &H10, 0&)
        ff = FreeFile
        ReDim Data(0 To FileLen(sLocalFile) - 1)
        Open sLocalFile For Binary As #ff
            Get #ff, , Data
        Close #ff
        Text1.Text = StrConv(Data, vbUnicode)
    End Sub
    this will download the page source and put it in text1.text, remember to change text1 to MultiLine
    also textbox is limited how much it can show. so its not broken.
    use RichTextBox instead.
    i told you i cannot use any other control than winsock
    my project require strictly winsock, because i must login first and then obtain cookies and only then grab page source
    so please only winsock with data arrival event
    not any other control

  26. #26

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    Re: Vb6: Winsock get data fix ( i pay $200 to who can fix this)

    still searching for someone who can fix this..

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    Re: Vb6: Winsock get data fix ( i pay $200 to who can fix this)

    You keep throwing in these oddball requirements. Why can't you use any other controls? Every thread of yours is very odd.

    Also, we all know you aren't scraping www.apache.org. Why are you hiding you true intentions? What are you afraid of?

  28. #28
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    Re: Vb6: Winsock data arrival multiple packets

    Quote Originally Posted by geekmaro View Post
    winhttp + xmlhttp + inet i tried all of them and they cant grab cookies
    only choice i have left is winsock bcoz only with winsock i could grab cookies
    WinHttpRequest manages cookies automatically if used properly. Just keep re-using the same instance per "session."

    Why would you need to "grab" cookies? Sounds like something nefarious is going on here.


    If they wanted to permit bots and non-web clients to access their site they would provide a web service. Use that. It is hard to imagine any responsible financial web site that would tolerate web scraping.

  29. #29

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    Re: Vb6: Winsock get data fix ( i pay $200 to who can fix this)

    Quote Originally Posted by OptionBase1 View Post
    You keep throwing in these oddball requirements. Why can't you use any other controls? Every thread of yours is very odd.

    Also, we all know you aren't scraping www.apache.org. Why are you hiding you true intentions? What are you afraid of?
    why should i show you my url? who are you ?
    either you give me code and get paid, or please stay away from my topic
    thank you

  30. #30
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    Re: Vb6: Winsock get data fix ( i pay $200 to who can fix this)

    No thanks.

  31. #31

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    Re: Vb6: Winsock get data fix ( i pay $200 to who can fix this)

    Quote Originally Posted by OptionBase1 View Post
    No thanks.
    better.

  32. #32
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    Re: Vb6: Winsock data arrival multiple packets

    Quote Originally Posted by dilettante View Post
    From all reports this should leave experimental status and be on by default in the next Win10 update (20H2) coming soon.
    I have it switched on here on my 2004 and SSPI/Schannel is not working against TLS 1.3 only servers at all.

    Code:
    Connecting to tls13.1d.pw
    Error: The message received was unexpected or badly formatted. Protocol version.
    Quote Originally Posted by dilettante View Post
    Sounds like something nefarious is going on here.
    He just wants to donate $200 to some charity, no?

    cheers,
    </wqw>

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    Re: Vb6: Winsock get data fix ( i pay $200 to who can fix this)

    Try that, I haven't used it for a long time, I don't know if it will work
    Code:
    Private Sub Command1_Click()
     With Winsock
        .RemoteHost = "apache.org"
        .RemotePort = 80
        .Close
        .Connect
     End With
    End Sub
     
    Private Sub Winsock_Connect()
        Winsock.SendData "GET www.apache.org HTTP/1.0" & vbCrLf _
            & "Host: apache.org" & vbCrLf _
            & "Accept: */*" & vbCrLf & vbCrLf
    End Sub
     
    Private Sub Winsock_DataArrival(ByVal bytesTotal As Long)
    Dim X As String
        Winsock.GetData X
        Text1.Text = X
    End Sub
     
    Private Sub Winsock_Error(ByVal Number As Integer, Description As String, ByVal Scode As Long, ByVal Source As String, ByVal HelpFile As String, ByVal HelpContext As Long, CancelDisplay As Boolean)
        Text1.Text = "Error " & Description
    End Sub

  34. #34
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    Re: Vb6: Winsock get data fix ( i pay $200 to who can fix this)

    Quote Originally Posted by geekmaro View Post
    why should i show you my url? who are you ?
    either you give me code and get paid, or please stay away from my topic
    thank you
    It's a valid question, and a good one. The site you are actually targeting doesn't prohibit what you are doing, so being clearly disingenuous about the site and everything else just has a bad smell to it. The site you are working with has an even worse smell about it, but it's your money, and you are free to make whatever mistake you want. However, lying about your intentions is clearly wrong, and nobody who has seen these threads believe you are being honest about this. Therefore, the thread is closed.
    My usual boring signature: Nothing

  35. #35

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    Re: Vb6: Winsock data arrival multiple packets

    Quote Originally Posted by wqweto View Post
    I have it switched on here on my 2004 and SSPI/Schannel is not working against TLS 1.3 only servers at all.

    Code:
    Connecting to tls13.1d.pw
    Error: The message received was unexpected or badly formatted. Protocol version.


    He just wants to donate $200 to some charity, no?

    cheers,
    </wqw>
    is is strange i cant find a single serious coder to write me code for my project
    i been searching for over 1 month now
    and not a single one of you guys could give me code
    all what you do is just blablablabla

  36. #36
    PowerPoster wqweto's Avatar
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    Re: Vb6: Winsock data arrival multiple packets

    Here is a generic downloader that implements the state machine for the http protocol:

    Code:
    Private Enum UcsStateEnum
        ucsIdle
        ucsWaitRecvHeaders
        ucsWaitRecvBody
        ucsWaitSendBody
        ucsWaitBoundary
    End Enum
    It does not currently support cookies or any headers customization though and is based on cAsyncSocket class, not Winsock control.

    Also note that http://bbhyip.ru site momentarily redirects to https secure version so you need http over TLS to access anything there.

    cheers,
    </wqw>
    p.s. Full sample here.

  37. #37

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    Re: Vb6: Winsock data arrival multiple packets

    Quote Originally Posted by wqweto View Post
    Here is a generic downloader that implements the state machine for the http protocol:

    Code:
    Private Enum UcsStateEnum
        ucsIdle
        ucsWaitRecvHeaders
        ucsWaitRecvBody
        ucsWaitSendBody
        ucsWaitBoundary
    End Enum
    It does not currently support cookies or any headers customization though and is based on cAsyncSocket class, not Winsock control.

    Also note that http://bbhyip.ru site momentarily redirects to https secure version so you need http over TLS to access anything there.

    cheers,
    </wqw>
    p.s. Full sample here.
    i dont need downloader, because i have to login into site and browse it, i get source code only to detect if specific keyword detected then move to another page
    that is why i use winsock control with data arrival event

  38. #38
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    Re: Vb6: Winsock data arrival multiple packets

    Quote Originally Posted by geekmaro View Post
    is is strange i cant find a single serious coder to write me code for my project
    i been searching for over 1 month now
    and not a single one of you guys could give me code
    all what you do is just blablablabla
    why not ask the Mod's to close this Thread if your not Happy with the response you get.

    your response ....all what you do is just blablablabla..... to the
    People that are trying to help is just insulting
    to hunt a species to extinction is not logical !
    since 2010 the number of Tigers are rising again in 2016 - 3900 were counted. with Baby Callas it's 3901, my wife and I had 2-3 months the privilege of raising a Baby Tiger.

  39. #39

    Thread Starter
    Addicted Member
    Join Date
    Mar 2016
    Posts
    143

    Re: Vb6: Winsock data arrival multiple packets

    Quote Originally Posted by ChrisE View Post
    why not ask the Mod's to close this Thread if your not Happy with the response you get.

    your response ....all what you do is just blablablabla..... to the
    People that are trying to help is just insulting
    you just arrived you dont know what happened before
    i asked for help for a whole month to give me code to fix issue
    i even offered $200 to anyone who can write me code
    but people just kept talking and no one solved my problem
    that is why i said that

  40. #40
    Frenzied Member
    Join Date
    Dec 2014
    Posts
    1,177

    Re: Vb6: Winsock data arrival multiple packets

    this is not a "pay for code" site, but a discussion, sharing, educational, helping, teaching forum.
    I will never take a job, and most of the other members will not as well.
    in the other thread you created, I pointed out what to do to fix your issue, but the response was:

    "friend im tired
    just give me code please"

    instead of thanks I will look into it, and next you try to figure it out yourself, if you fail after many attempts, you post another question, with a new code that you dont understand or want help with.
    all the energy you put to post here and insult people or ask the same question over and over could be used to actually fix your program.

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