Check for internet connection gives error in windows 8 - vb6

I Have a vb6 code which is used to test whether internet connection is there or not for a PC.I make use of checking google DNS for it.It works fine in Windows XP.But in Windows 8 if internet is connected or not it always returns success(Internet is connected).
I am making use of
Below is part of coding
Private Function CheckForInternet(ByVal ServerIP As String, ByRef IsTimedOut As Boolean) A
s Boolean
On Error GoTo CheckForInternet_EH
Dim Reply As ICMP_ECHO_REPLY
Dim lngSuccess As Long
Dim strIPAddress As String
Dim a As String
Dim startTimer As Single
Dim EndTimer As Single
Const Time_out_in_ms As Integer = 1000
'Get the sockets ready.
If SocketsInitialize() Then
'Address to ping
strIPAddress = ServerIP
'Ping the IP that is passing the address and get a reply.
lngSuccess = ping(strIPAddress, Time_out_in_ms, Reply)
'Clean up the sockets.
SocketsCleanup
''Return Value
If lngSuccess = ICMP_SUCCESS Then
CheckForInternet = True
ElseIf lngSuccess = ICMP_STATUS_REQUEST_TIMED_OUT Then
IsTimedOut = True
End If
'Else
' 'Winsock error failure, initializing the sockets.
' Debug.Print WINSOCK_ERROR
End If
Exit Function
CheckForInternet_EH:
Call msglog(Err.Description & Space(10) & "CheckForInternet", False)
End Function
And below is ping procedure
Public Function ping(ByVal sAddress As String, ByVal time_out As Long, Reply As ICMP_ECHO_REPLY) As Long
On Error GoTo ping_EH
Dim hIcmp As Long
Dim lAddress As Long
Dim lTimeOut As Long
Dim StringToSend As String
'Short string of data to send
StringToSend = "hello"
'ICMP (ping) timeout
lTimeOut = time_out ''ms
'Convert string address to a long representation.
lAddress = inet_addr(sAddress)
If (lAddress <> -1) And (lAddress <> 0) Then
'Create the handle for ICMP requests.
hIcmp = IcmpCreateFile()
If hIcmp Then
'Ping the destination IP address.
Call IcmpSendEcho(hIcmp, lAddress, StringToSend, Len(StringToSend), 0, Reply, Len(Reply), lTimeOut)
'Reply status
ping = Reply.Status
'Close the Icmp handle.
IcmpCloseHandle hIcmp
Else
'Debug.Print "failure opening icmp handle."
ping = -1
End If
Else
ping = -1
End If
Exit Function
ping_EH:
Call msglog(Err.Description & Space(10) & "ping", False)
End Function
It is only a part of coding(I do pass parameters properly such as sAddress with DNS of google etc).Now i have observed that when internet connection is there in windows xp ping = Reply.Status returns 0 (which is for success).Same is the case in Windows 8 also.But when internet connection is not there windows xp returns ping value as 11003(which means no internet connection).But in windows 8 it still returns 0 which is for success.
So i think it is problem with IcmpSendEcho function which returns wrong value
i have defined following also
Private Declare Function IcmpSendEcho Lib "icmp.dll" _
(ByVal IcmpHandle As Long, _
ByVal DestinationAddress As Long, _
ByVal RequestData As String, _
ByVal RequestSize As Long, _
ByVal RequestOptions As Long, _
ReplyBuffer As ICMP_ECHO_REPLY, _
ByVal ReplySize As Long, _
ByVal Timeout As Long) As Long
'This structure describes the options that will be included in the header of an IP packet.
'http://msdn.microsoft.com/library/default.asp?url=/library/en-us/wcetcpip/htm/cerefIP_OPTION_INFORMATION.asp
Private Type IP_OPTION_INFORMATION
Ttl As Byte
Tos As Byte
Flags As Byte
OptionsSize As Byte
OptionsData As Long
End Type
'This structure describes the data that is returned in response to an echo request.
'http://msdn.microsoft.com/library/default.asp?url=/library/en-us/wcesdkr/htm/_wcesdk_icmp_echo_reply.asp
Public Type ICMP_ECHO_REPLY
address As Long
Status As Long
RoundTripTime As Long
DataSize As Long
Reserved As Integer
ptrData As Long
Options As IP_OPTION_INFORMATION
Data As String * 250
End Type
Hint:also in link IcmpSendEcho IP_OPTION_INFORMATION for 64 bit pc is different etc.. etc..
In the link it is mentioned like "A buffer to hold any replies to the echo request. Upon return, the buffer contains an array of ICMP_ECHO_REPLY structures followed by the options and data for the replies. The buffer should be large enough to hold at least one ICMP_ECHO_REPLY structure plus RequestSize bytes of data."
So i want to now how to declare ICMP_ECHO_REPLY32 and IP_OPTION_INFORMATION32 ?(i have used only ICMP_ECHO_REPLY and IP_OPTION_INFORMATION)
So please help me to solve the problem

To check the internet connection I did this two simple functions:
Option Explicit
Private Declare Function InternetCheckConnectionA Lib "wininet.dll" (ByVal lpszUrl As String, ByVal dwFlags As Long, ByVal dwReserved As Long) As Long
Private Const FLAG_ICC_FORCE_CONNECTION As Long = &H1
Public Function IsInternetOn() As Boolean
IsInternetOn = InternetCheckConnectionA("http://www.google.com/", FLAG_ICC_FORCE_CONNECTION, 0&)
End Function
The second one:
Option Explicit
Private Declare Function InternetGetConnectedState Lib "wininet.dll" (ByRef lpdwFlags As Long, ByVal dwReserved As Long) As Long
Private Function IsInternetOn() As Boolean
IsInternetOn = InternetGetConnectedState(0&, 0&)
End Function
Example of call:
Msgbox IsInternetOn()

Related

Calling FindMimeFromData from VB6

Public Declare Function FindMimeFromData Lib "urlmon.dll" ( _
ByVal pbc As Long, _
ByVal pwzUrl As String, _
pBuffer As Any, _
cbSize As Long, _
ByVal pwzMimeProposed As String, _
dwMimeFlags As Long, _
ppwzMimeOut As Long, _
dwReserved As Long) As Long
In VB6, I can't seem to figure out how to pass the pBuffer parameter of the first 256 characters of a file. When I try to use a Dim buffer() As Byte and populate that, and pass it as the parameter, it throws the error of wrong param even those of the definition is Any.
I've tried to use this example, but passing the entire file name from a file system doesn't seem to work. so I have to try sending it like the C# example with the first 256 bytes of the file.
Can anyone help?
I played around with the following Declare, and built up some code around it. There are two wrappers, GetMimeTypeFromUrl() and GetMimeTypeFromData(). I found the former only worked when you used simple URLs such as http://host.com/file.xtn. You may have to play around with the other flags.
However, the other wrapper function sounds like what you need.
Note that all the string pointers are declared As Long, and I pass the underlying UTF-16 VB string as a pointer using StrPtr().
Also note that you have to use CoTaskMemFree() to free the output ppwzMimeOut string pointer, otherwise you will leak memory.
Option Explicit
Private Declare Function FindMimeFromData Lib "Urlmon.dll" ( _
ByVal pBC As Long, _
ByVal pwzUrl As Long, _
ByVal pBuffer As Long, _
ByVal cbSize As Long, _
ByVal pwzMimeProposed As Long, _
ByVal dwMimeFlags As Long, _
ByRef ppwzMimeOut As Long, _
ByVal dwReserved As Long _
) As Long
'
' Flags:
'
' Default
Private Const FMFD_DEFAULT As Long = &H0
' Treat the specified pwzUrl as a file name.
Private Const FMFD_URLASFILENAME As Long = &H1
' Internet Explorer 6 for Windows XP SP2 and later. Use MIME-type detection even if FEATURE_MIME_SNIFFING is detected. Usually, this feature control key would disable MIME-type detection.
Private Const FMFD_ENABLEMIMESNIFFING As Long = &H2
' Internet Explorer 6 for Windows XP SP2 and later. Perform MIME-type detection if "text/plain" is proposed, even if data sniffing is otherwise disabled. Plain text may be converted to text/html if HTML tags are detected.
Private Const FMFD_IGNOREMIMETEXTPLAIN As Long = &H4
' Internet Explorer 8. Use the authoritative MIME type specified in pwzMimeProposed. Unless FMFD_IGNOREMIMETEXTPLAIN is specified, no data sniffing is performed.
Private Const FMFD_SERVERMIME As Long = &H8
' Internet Explorer 9. Do not perform detection if "text/plain" is specified in pwzMimeProposed.
Private Const FMFD_RESPECTTEXTPLAIN As Long = &H10
' Internet Explorer 9. Returns image/png and image/jpeg instead of image/x-png and image/pjpeg.
Private Const FMFD_RETURNUPDATEDIMGMIMES As Long = &H20
'
' Return values:
'
' The operation completed successfully.
Private Const S_OK As Long = 0&
' The operation failed.
Private Const E_FAIL As Long = &H80000008
' One or more arguments are invalid.
Private Const E_INVALIDARG As Long = &H80000003
' There is insufficient memory to complete the operation.
Private Const E_OUTOFMEMORY As Long = &H80000002
'
' String routines
'
Private Declare Function lstrlen Lib "Kernel32.dll" Alias "lstrlenW" ( _
ByVal lpString As Long _
) As Long
Private Declare Sub CopyMemory Lib "Kernel32.dll" Alias "RtlMoveMemory" (ByVal pDest As Long, ByVal pSrc As Long, ByVal nCount As Long)
Private Declare Sub CoTaskMemFree Lib "Ole32.dll" ( _
ByVal pv As Long _
)
Private Function CopyPointerToString(ByVal in_pString As Long) As String
Dim nLen As Long
' Need to copy the data at the string pointer to a VB string buffer.
' Get the length of the string, allocate space, and copy to that buffer.
nLen = lstrlen(in_pString)
CopyPointerToString = Space$(nLen)
CopyMemory StrPtr(CopyPointerToString), in_pString, nLen * 2
End Function
Private Function GetMimeTypeFromUrl(ByRef in_sUrl As String, ByRef in_sProposedMimeType As String) As String
Dim pMimeTypeOut As Long
Dim nRet As Long
nRet = FindMimeFromData(0&, StrPtr(in_sUrl), 0&, 0&, StrPtr(in_sProposedMimeType), FMFD_DEFAULT, pMimeTypeOut, 0&)
If nRet = S_OK Then
GetMimeTypeFromUrl = CopyPointerToString(pMimeTypeOut)
CoTaskMemFree pMimeTypeOut
Else
Err.Raise nRet
End If
End Function
Private Function GetMimeTypeFromData(ByRef in_abytData() As Byte, ByRef in_sProposedMimeType As String) As String
Dim nLBound As Long
Dim nUBound As Long
Dim pMimeTypeOut As Long
Dim nRet As Long
nLBound = LBound(in_abytData)
nUBound = UBound(in_abytData)
nRet = FindMimeFromData(0&, 0&, VarPtr(in_abytData(nLBound)), nUBound - nLBound + 1, StrPtr(in_sProposedMimeType), FMFD_DEFAULT, pMimeTypeOut, 0&)
If nRet = S_OK Then
GetMimeTypeFromData = CopyPointerToString(pMimeTypeOut)
CoTaskMemFree pMimeTypeOut
Else
Err.Raise nRet
End If
End Function
Private Sub Command1_Click()
Dim sRet As String
Dim abytData() As Byte
sRet = GetMimeTypeFromUrl("http://msdn.microsoft.com/en-us/library/ms775107%28v=vs.85%29.aspx", vbNullString)
Debug.Print sRet
abytData() = StrConv("<HTML><HEAD><TITLE>Stuff</TITLE></HEAD><BODY>Test me</BODY></HTML>", vbFromUnicode)
sRet = GetMimeTypeFromData(abytData(), vbNullString)
Debug.Print sRet
End Sub

Fast way to check if a specific computer exists in my network

Well... I think the title says all. I wanna check if a pc exists on my network, for example "JOAN-PC".
Now I'm doing something like this:
Dim oShell As Object
Set oShell = CreateObject("Shell.Application")
MsgBox Not CBool(oShell.NameSpace(CVar("\\JOAN-PC")) Is Nothing)
Works good, but is slow, and my program have to call it a lot of times.
Some of you know a fast way to do the same thing?
Thanks in advance.
Perhaps you could use NetRemoteTOD or a related simple network API, even a "ping" request.
Here's a small example you might adapt. Give it a try, the timeout for machines that don't respond doesn't seem too long (7 or 8 seconds). For legit uses this probably won't be an issue, but it is long enough to discourage malicious "scanners" trying to sweep whole networks by IP address for victim machines.
Option Explicit
'Fetch and display Net Remote Time Of Day from a
'remote Windows system. Supply a UNC hostname,
'DNS name, or IP address - or empty string for
'the local host's time and date.
'
'Form has 3 controls:
'
' txtServer TextBox
' cmdGetTime CommandButton
' lblTime Label
Private Const NERR_SUCCESS As Long = 0
Private Type TIME_OF_DAY_INFO
tod_elapsedt As Long
tod_msecs As Long
tod_hours As Long
tod_mins As Long
tod_secs As Long
tod_hunds As Long
tod_timezone As Long
tod_tinterval As Long
tod_day As Long
tod_month As Long
tod_year As Long
tod_weekday As Long
End Type
Private Declare Function NetApiBufferFree Lib "netapi32" ( _
ByVal lpBuffer As Long) As Long
Private Declare Function NetRemoteTOD Lib "netapi32" ( _
ByRef UncServerName As Byte, _
ByRef BufferPtr As Long) As Long
Private Declare Sub CopyMemory Lib "kernel32" Alias "RtlMoveMemory" ( _
ByRef pTo As Any, _
ByRef uFrom As Any, _
ByVal lSize As Long)
Private Function GetTOD(ByVal Server As String) As Date
Dim bytServer() As Byte
Dim lngBufPtr As Long
Dim todReturned As TIME_OF_DAY_INFO
bytServer = Trim$(Server) & vbNullChar
If NetRemoteTOD(bytServer(0), lngBufPtr) = NERR_SUCCESS Then
CopyMemory todReturned, ByVal lngBufPtr, LenB(todReturned)
NetApiBufferFree lngBufPtr
With todReturned
GetTOD = DateAdd("n", _
-.tod_timezone, _
DateSerial(.tod_year, .tod_month, .tod_day) _
+ TimeSerial(.tod_hours, .tod_mins, .tod_secs))
End With
Else
Err.Raise vbObjectError Or &H2000&, _
"GetTOD", _
"Failed to obtain time from server"
End If
End Function
Private Sub cmdGetTime_Click()
Dim dtServerTime As Date
On Error Resume Next
dtServerTime = GetTOD(txtServer.Text)
If Err.Number <> 0 Then
lblTime.Caption = Err.Description
Else
lblTime.Caption = CStr(dtServerTime)
End If
On Error GoTo 0
txtServer.SetFocus
End Sub

vb6 - how to get the remote computer name based on the given IP address

how can i get the remote computer name based on a given IP Address in vb6? Is there any way that i can list out a list of computers linked to current computer?
If reverse DNS lookup does what you want this might help. This example simplifies the processing of the DNS results, but should get you started and may be enough:
Option Explicit
Private Const DNS_TYPE_PTR = &HC
Private Const DNS_QUERY_STANDARD = &H0
Private Const DnsFreeRecordListDeep = 1&
Private Enum DNS_STATUS
ERROR_BAD_IP_FORMAT = -3&
ERROR_NO_PTR_RETURNED = -2&
ERROR_NO_RR_RETURNED = -1&
DNS_STATUS_SUCCESS = 0&
End Enum
Private Type VBDnsRecord
pNext As Long
pName As Long
wType As Integer
wDataLength As Integer
Flags As Long
dwTTL As Long
dwReserved As Long
prt As Long
others(9) As Long
End Type
Private Declare Function DnsQuery Lib "Dnsapi" Alias "DnsQuery_A" ( _
ByVal Name As String, _
ByVal wType As Integer, _
ByVal Options As Long, _
ByRef aipServers As Any, _
ByRef ppQueryResultsSet As Long, _
ByVal pReserved As Long) As Long
Private Declare Function DnsRecordListFree Lib "Dnsapi" ( _
ByVal pDnsRecord As Long, _
ByVal DnsFreeRecordListDeep As Long) As Long
Private Declare Sub CopyMemory Lib "kernel32" Alias "RtlMoveMemory" ( _
ByRef pTo As Any, _
ByRef uFrom As Any, _
ByVal lSize As Long)
Private Declare Function StrCopyA Lib "kernel32" Alias "lstrcpyA" ( _
ByVal retval As String, _
ByVal PTR As Long) As Long
Private Declare Function StrLenA Lib "kernel32" Alias "lstrlenA" ( _
ByVal PTR As Long) As Long
Public Function IP2HostName(ByVal IP As String, ByRef HostName As String) As Long
Dim Octets() As String
Dim OctX As Long
Dim NumPart As Long
Dim BadIP As Boolean
Dim lngDNSRec As Long
Dim Record As VBDnsRecord
Dim Length As Long
'Returns DNS_STATUS Enum values, otherwise a DNS system error code.
IP = Trim$(IP)
If Len(IP) = 0 Then IP2HostName = ERROR_BAD_IP_FORMAT: Exit Function
Octets = Split(IP, ".")
If UBound(Octets) <> 3 Then IP2HostName = ERROR_BAD_IP_FORMAT: Exit Function
For OctX = 0 To 3
If IsNumeric(Octets(OctX)) Then
NumPart = CInt(Octets(OctX))
If 0 <= NumPart And NumPart <= 255 Then
Octets(OctX) = CStr(NumPart)
Else
BadIP = True
Exit For
End If
Else
BadIP = True
Exit For
End If
Next
If BadIP Then IP2HostName = ERROR_BAD_IP_FORMAT: Exit Function
IP = Octets(3) & "." & Octets(2) & "." & Octets(1) & "." & Octets(0) & ".IN-ADDR.ARPA"
IP2HostName = DnsQuery(IP, DNS_TYPE_PTR, DNS_QUERY_STANDARD, ByVal 0, lngDNSRec, 0)
If IP2HostName = DNS_STATUS_SUCCESS Then
If lngDNSRec <> 0 Then
CopyMemory Record, ByVal lngDNSRec, LenB(Record)
With Record
If .wType = DNS_TYPE_PTR Then
Length = StrLenA(.prt)
HostName = String$(Length, 0)
StrCopyA HostName, .prt
Else
IP2HostName = ERROR_NO_PTR_RETURNED
End If
End With
DnsRecordListFree lngDNSRec, DnsFreeRecordListDeep
Else
IP2HostName = ERROR_NO_RR_RETURNED
End If
'Else
'Return with DNS error code.
End If
End Function
Note however it does not handle NetBIOS names.
According to this Microsoft support article, the standard GetHostByAddr() functions should do it. Unfortunately, I can't find any examples of how to do a GetHostByAddr call in VB6, but perhaps someone else can help with that part. Alternately, you could run a commandline tool like nslookup:
bensonk#hunter ~/Desktop/cont $ nslookup 64.34.119.12
Server: 208.67.222.222
Address: 208.67.222.222#53
Non-authoritative answer:
12.119.34.64.in-addr.arpa name = stackoverflow.com.
That example was run on a linux machine, but the same command will work fine on windows.
MOST SIMPLE TECHNIQUE EVER
To send computer name ,
Do this:
Create a textbox,
Change its multiline property to true.
After that, in the text property of that textbox, write this:
echo %computername% >> C:\temp.txt
then, using Fileinput, input the textfile and input the textfile C:\temp.txt.
If you want to use this for sending over winsock or LAN, Send the text box text using winsock1.sendata
Done

VB6 Lookup Hostname From IP, Specifying DNS Server

I know how to look up a hostname from an IPv4 in VB using the GetHostByAddr Windows API call (this works great). However, that function does not allow one to specify the DNS server to use. Sometimes the default company DNS servers are fine, but other times I need to specify an external DNS server for lookups, and I don't think doing a shell nslookup and parsing the output is the best method, here.
Note: this is actually going to be used as VBA code in an Excel workbook to help someone else do his job, and it's not worth writing a big application when some simple functionality is all he needs.
I thought I had possibly found an answer in the API call getnameinfo but careful reading seems to indicate it does not offer a servername parameter.
After some intense searching, I found reference to the pExtra parameter to the DNSQuery function. But I don't even know how to begin to use that in VB6.
Could anyone help me out in any way with doing a DNS lookup from VB6, specifying the servername to use?
A full working solution would of course be nice, but I'm willing to work: just point me in the right direction.
UPDATE: For some odd reason it didn't click that DNSQuery was a Windows API call. It just didn't sound like one. I certainly would have been able to make more headway on the problem if I'd gathered that one tiny detail.
Try this:
Option Explicit
Private Declare Function DnsQuery Lib "dnsapi" Alias "DnsQuery_A" (ByVal strname As String, ByVal wType As Integer, ByVal fOptions As Long, ByVal pServers As Long, ppQueryResultsSet As Long, ByVal pReserved As Long) As Long
Private Declare Function DnsRecordListFree Lib "dnsapi" (ByVal pDnsRecord As Long, ByVal FreeType As Long) As Long
Private Declare Function lstrlen Lib "kernel32" (ByVal straddress As Long) As Long
Private Declare Sub CopyMemory Lib "kernel32" Alias "RtlMoveMemory" (Destination As Any, ByVal Source As Long, ByVal Length As Long)
Private Declare Function inet_ntoa Lib "ws2_32.dll" (ByVal pIP As Long) As Long
Private Declare Function inet_addr Lib "ws2_32.dll" (ByVal sAddr As String) As Long
Private Const DnsFreeRecordList As Long = 1
Private Const DNS_TYPE_A As Long = &H1
Private Const DNS_QUERY_BYPASS_CACHE As Long = &H8
Private Type VBDnsRecord
pNext As Long
pName As Long
wType As Integer
wDataLength As Integer
flags As Long
dwTel As Long
dwReserved As Long
prt As Long
others(35) As Byte
End Type
Private Sub Command1_Click()
MsgBox Resolve("google.com", "208.67.222.222")
End Sub
Private Function Resolve(sAddr As String, Optional sDnsServers As String) As String
Dim pRecord As Long
Dim pNext As Long
Dim uRecord As VBDnsRecord
Dim lPtr As Long
Dim vSplit As Variant
Dim laServers() As Long
Dim pServers As Long
Dim sName As String
If LenB(sDnsServers) <> 0 Then
vSplit = Split(sDnsServers)
ReDim laServers(0 To UBound(vSplit) + 1)
laServers(0) = UBound(laServers)
For lPtr = 0 To UBound(vSplit)
laServers(lPtr + 1) = inet_addr(vSplit(lPtr))
Next
pServers = VarPtr(laServers(0))
End If
If DnsQuery(sAddr, DNS_TYPE_A, DNS_QUERY_BYPASS_CACHE, pServers, pRecord, 0) = 0 Then
pNext = pRecord
Do While pNext <> 0
Call CopyMemory(uRecord, pNext, Len(uRecord))
If uRecord.wType = DNS_TYPE_A Then
lPtr = inet_ntoa(uRecord.prt)
sName = String(lstrlen(lPtr), 0)
Call CopyMemory(ByVal sName, lPtr, Len(sName))
If LenB(Resolve) <> 0 Then
Resolve = Resolve & " "
End If
Resolve = Resolve & sName
End If
pNext = uRecord.pNext
Loop
Call DnsRecordListFree(pRecord, DnsFreeRecordList)
End If
End Function
It is not an answer, but very important note to wqw post:
Security Warning on lstrlen function (lines 5 & 55):
Using this function incorrectly can compromise the security of your
application. lstrlen assumes that lpString is a null-terminated
string, or NULL. If it is not, this could lead to a buffer overrun or
a denial of service attack against your application.
Consider using one of the following alternatives: StringCbLength or
StringCchLength.
You can use the DNS WMI provider to set the DNS of the system then use GetHostByAddr

Printer Page Size Problem

I am trying to set a custom paper size by doing:
Printer.Height = 2160
Printer.Width = 11900
But it doesn't seen to have any effect. After setting this up, i ask for that values and it returns the default ones. And this:
Printer.PaperSize = 256
Returns an error...
Any ideas??
Either your printer doesn't allow these properties to be set, or you're exceeding their maximum allowed values. From the Visual Basic Reference
If you set the Height and Width
properties for a printer driver that
doesn't allow these properties to be
set, no error occurs and the size of
the paper remains as it was. If you
set Height and Width for a printer
driver that allows only certain values
to be specified, no error occurs and
the property is set to whatever the
driver allows. For example, you could
set Height to 150 and the driver would
set it to 144.
I don't know why you're getting an error when you set the Papersize property to 256. It works for me. Also, the documentation states, "Setting a printer's Height or Width property automatically sets PaperSize to vbPRPSUser.", which equals 256.
I was actually involved with the same problem but I just happen to find a breakthrough.
First you need to create a custom form that defines you custom paper size. Then, you need to
refer to Windows API to check the form name you've just created. You'll get the for name
from an array returned from a function and use the array index where the form name was found.
Finally use it as the value for printer.papersize
Example below:
Public Type PRINTER_DEFAULTS
pDatatype As Long
pDevMode As Long
DesiredAccess As Long
End Type
Public Type FORM_INFO_1
Flags As Long
pName As Long ' String
Size As SIZEL
ImageableArea As RECTL
End Type
Public Declare Function EnumForms Lib "winspool.drv" Alias "EnumFormsA" _
(ByVal hPrinter As Long, ByVal Level As Long, ByRef pForm As Any, _
ByVal cbBuf As Long, ByRef pcbNeeded As Long, _
ByRef pcReturned As Long) As Long
Public Declare Sub CopyMemory Lib "KERNEL32" Alias "RtlMoveMemory" _
(pDest As Any, pSource As Any, ByVal cbLength As Long)
Public Declare Sub Sleep Lib "KERNEL32" (ByVal dwMilliseconds As Long)
Public Declare Function OpenPrinter Lib "winspool.drv" Alias _
"OpenPrinterA" (ByVal pPrinterName As String, phPrinter As Long, _
pDefault As PRINTER_DEFAULTS) As Long
Public Declare Function ClosePrinter Lib "winspool.drv" _
(ByVal hPrinter As Long) As Long
Public Declare Function lstrcpy Lib "KERNEL32" Alias "lstrcpyA" _
(ByVal lpString1 As String, ByRef lpString2 As Long) As Long
'UDF
Public Function PtrCtoVbString(ByVal Add As Long) As String
Dim sTemp As String * 512, x As Long
x = lstrcpy(sTemp, ByVal Add)
If (InStr(1, sTemp, Chr(0)) = 0) Then
PtrCtoVbString = ""
Else
PtrCtoVbString = Left(sTemp, InStr(1, sTemp, Chr(0)) - 1)
End If
End Function
Public Function IsFormExist(ByVal DeviceName As String, ByVal isFormName As String, ByVal PrinterHandle As Long) As Long
Dim NumForms As Long, i As Long
Dim FI1 As FORM_INFO_1
Dim pd As PRINTER_DEFAULTS
Dim aFI1() As FORM_INFO_1 ' Working FI1 array
Dim Temp() As Byte ' Temp FI1 array
Dim FormIndex As Integer
Dim BytesNeeded As Long
Dim RetVal As Long
On Error GoTo cleanup
FormIndex = 0
ReDim aFI1(1)
' First call retrieves the BytesNeeded.
RetVal = OpenPrinter(DeviceName, PrinterHandle, pd)
If (RetVal = 0) Or (PrinterHandle = 0) Then
'Can't access current printer. Bail out doing nothing
Exit Function
End If
RetVal = EnumForms(PrinterHandle, 1, aFI1(0), 0&, BytesNeeded, NumForms)
ReDim Temp(BytesNeeded)
ReDim aFI1(BytesNeeded / Len(FI1))
' Second call actually enumerates the supported forms.
RetVal = EnumForms(PrinterHandle, 1, Temp(0), BytesNeeded, BytesNeeded, _
NumForms)
Call CopyMemory(aFI1(0), Temp(0), BytesNeeded)
For i = 0 To NumForms - 1
With aFI1(i)
If isFormName = PtrCtoVbString(.pName) Then
' Found the desired form
FormIndex = i + 1
Exit For
End If
End With
Next i
IsFormExist = FormIndex ' Returns the number when form is found.
cleanup:
'Release the printer handle
If (PrinterHandle <> 0) Then Call ClosePrinter(PrinterHandle)
End Function
'Here We Go
dim papercode as long, printername as string, formname as string
printername=printer.Devicename
formname = "myform"
papercode=IsFormExist(printername, formname, Printer.hdc)
if papercode<>0 then
printer.papersize=papercode
end if
Give it a try, good luck
Are you sure the error isn't related to the maximum print width of the printer itself? Many printers have a max print width of 8.25" (11880) to allow 1/4" margins on either side of a 8.5" wide paper.
Quickest way to check would be to simply set the print wide to 11880 or lower and see if it works.
Another possibility would be permissions to the printer. If it's a shared network resource it may be locked down.
The solution is to use windows 98. It does not work with win2k, neither winXP. The same code, the same printer.
Regards.
I'm testing this code, but I can not see the custom form I created using printers and scanners in the Control Panel Windows XP Professional SP3.
Note: I could check in regedit that this form exists and its ID is 512 in a string value and it contains the name of the form created in the printers control panel.
Why this function does not return my custom form, I am using an HP Laserjet 1020.

Resources