Re: Open port USB with vb.net in PDA | Abrir el puerto USB con vb.net en PDA
From: Sean Gahan (sean_at_optistreams.net)
Date: 04/28/04
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Date: Wed, 28 Apr 2004 08:19:59 -0700
Slobodan,
Ok, so I was ½ correct ;)
Is there any part of the Windows OS that you are not familiar with?
Regards,
Sean Gahan
"Slobodan Brcin (eMVP)" <sbrcin@ptt.yu> wrote in message
news:ety7tOLLEHA.1484@tk2msftngp13.phx.gbl...
> User application can not access 378h port of 3f8, 2f8, or any other port
for
> that matter.
>
> But you can use drivers that control that ports some other ports or
virtual
> devices or what ever to communicate in well in some way unified manners.
>
> You can do only what driver that you have opened trough CreateFile let you
> do trough its functionality. (You have no idea if this is real hardware
some
> simulation or how it is implemented when you look at it from user mode)
>
> Regards,
> Slobodan
>
> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> Have an opinion on the effectiveness of Microsoft Embedded newsgroups?
Tell
> Microsoft!
> https://www.windowsembeddedeval.com/community/newsgroups
> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>
> "Sean Gahan" <sean@optistreams.net> wrote in message
> news:e7$AzILLEHA.3016@tk2msftngp13.phx.gbl...
> > Slobodan,
> > I was under the impression that NT had two I/O privilege levels and user
> > level applications did not have the appropriate privileges to access the
> > port. Thank you for clarifying that for me.
> >
> > Regards,
> >
> > Sean Gahan
> >
> >
> > "Slobodan Brcin (eMVP)" <sbrcin@ptt.yu> wrote in message
> > news:unJBKlKLEHA.2716@tk2msftngp13.phx.gbl...
> > > Hi Sean,
> > >
> > > > I didn't think that you cant use WriteFile() on a printer port with
> the
> > NT
> > > > kernel, but is this ok with USB?
> > >
> > > ??? I fail to see what you are saying/asking. ???
> > >
> > > If you are asking if you can use LPT with WriteFile to print raw text
or
> > > data then answer is positive. You can write directly to LPT port.
> > >
> > > Also you can write to any other thing like COM, USB COM, or any other
> > > virtual COM for that matter.
> > >
> > > Implementation or ReadFile, WriteFile, DeviceIoControl is not kernel
> > > related, but more it is related to driver implementation that you
opened
> > > with CreateFile.
> > >
> > > Regards,
> > > Slobodan
> > >
> > > ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> > > Have an opinion on the effectiveness of Microsoft Embedded newsgroups?
> > Tell
> > > Microsoft!
> > > https://www.windowsembeddedeval.com/community/newsgroups
> > > ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> > >
> > > > Regards,
> > > >
> > > > Sean Gahan
> > > >
> > > >
> > > > "Slobodan Brcin (eMVP)" <sbrcin@ptt.yu> wrote in message
> > > > news:ejS%23H2JLEHA.3904@TK2MSFTNGP09.phx.gbl...
> > > > > API functions usually won't throw exceptions.
> > > > > Assuming that your CreateFile is successful and you have obtained
> > valid
> > > > > handle.
> > > > >
> > > > > WriteFile function will work. Or at least it worked on all USB COM
> > ports
> > > I
> > > > > have used so far.
> > > > >
> > > > > I fail to see what DeviceIoControl code you have tried to use.
> > > > >
> > > > > BTW: make sure that GetLastError function returns 0 in all cases
> after
> > > > each
> > > > > function you call.
> > > > >
> > > > >
> > > > > Regards,
> > > > > Slobodan
> > > > >
> > > > > ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> > > > > Have an opinion on the effectiveness of Microsoft Embedded
> newsgroups?
> > > > Tell
> > > > > Microsoft!
> > > > > https://www.windowsembeddedeval.com/community/newsgroups
> > > > > ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> > > > >
> > > > > "Edgar Hdz" <ragdeh@hotmail.com> wrote in message
> > > > > news:#0pLefJLEHA.1484@tk2msftngp13.phx.gbl...
> > > > > > Thanks Slobodan
> > > > > >
> > > > > > But, my code don't return error or Exception code;
> > > > > > I use GetLastError() and all Ok,
> > > > > > At this moment I can open the COM9 but now I need to send text
to
> > USB
> > > > port
> > > > > > for RS232
> > > > > > I use WriteFile() and it doesn't send nothing or even return
error
> > or
> > > > > > exception code
> > > > > > I also use DeviceIOcontrol() and it doesn't send nothing or
even
> > > return
> > > > > > error or exception code
> > > > > >
> > > > > > can you help me?
> > > > > >
> > > > > > I need a number for IOCTL_XXXXX maybe you can send it with them
!
> > > > > >
> > > > > > Thanks
> > > > > > Edgar Hdz
> > > > > >
> > > > > > |<Español>|
> > > > > > Gracias Slobodan
> > > > > >
> > > > > > Pero mi codigo no regresa codigo de error o excepción;
> > > > > > uso GetLastError() y todo funciona,
> > > > > > en este momento he logrado abrir el puerto COM9 pero ahora
> necesito
> > > > > enviarle
> > > > > > datos a el puerto para RS232
> > > > > > uso WriteFile() y no envia nada ni regresa codigo de error o
> > excepción
> > > > > > tambien uso DeviceIOcontrol() y no envia nada ni regresa codigo
> de
> > > > error
> > > > > o
> > > > > > excepción
> > > > > >
> > > > > > Puede ayudarme?
> > > > > >
> > > > > > Necesito los numeros para IOCTL_XXXXX quizá pueda enviarlo con
> esto!
> > > > > >
> > > > > > Gracias
> > > > > > Edgar Hdz
> > > > > >
> > > > > >
> > > > > >
> > > > > >
> > > > > >
> > > > > > "Slobodan Brcin (eMVP)" <sbrcin@ptt.yu> escribió en el mensaje
> > > > > > news:uKFcaFJLEHA.1272@tk2msftngp13.phx.gbl...
> > > > > > > Edgar this is probably wrong NG.
> > > > > > >
> > > > > > > You should check errors returned by CreateFile and other
> > functions.
> > > > > > >
> > > > > > > Use GetLastError to get error code.
> > > > > > > Without this error code there is a little that we can do to
help
> > > you.
> > > > > > >
> > > > > > > BTW: In case that open fails on COM9: try \\.\COM9:
> > > > > > >
> > > > > > > Regards,
> > > > > > > Slobodan
> > > > > > >
> > > > > > > ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> > > > > > > Have an opinion on the effectiveness of Microsoft Embedded
> > > newsgroups?
> > > > > > Tell
> > > > > > > Microsoft!
> > > > > > > https://www.windowsembeddedeval.com/community/newsgroups
> > > > > > > ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> > > > > > >
> > > > > > > "Edgar Hdz" <ragdeh@hotmail.com> wrote in message
> > > > > > > news:utXtUAJLEHA.1644@TK2MSFTNGP09.phx.gbl...
> > > > > > > > Hi everybody |<es>| Hola a todos
> > > > > > > >
> > > > > > > > I have a problem with a USB; I can´t open USB port with
VB.net
> > for
> > > > PDA
> > > > > > > > |<es>| Tengo un problema con el USB; no he logrado abrir el
> > puerto
> > > > USB
> > > > > > con
> > > > > > > > VB.net
> > > > > > > >
> > > > > > > > I need send text to a printer RS232 but i can´t;
> > > > > > > > |<es>| Necesito enviar texto a una impresora RS232 pero no
> > puedo
> > > > > > > > I have USB to RS232 (Chip PL2303)
> > > > > > > > |<es>| Tengo un cable USB a RS232 (Chip PL2303)
> > > > > > > >
> > > > > > > > can you help me? can you tell me how open the port?
> > > > > > > > |<es>| Prodrian ayudarme? podrian decirme como abrir el
> puerto?
> > > > > > > >
> > > > > > > > I use CreateFile() and WriteFile() but it dosen't works
> > > > > > > > |<es>| He usado CreateFile() y WriteFile() pero no funcina
> > > > > > > >
> > > > > > > > I also use CreateFile() and DeviceIOcontrol() but it dosen't
> > works
> > > > > > > > |<es>| Tambien he usado CreateFile() y DeviceIOcontrol() y
no
> > > > funciona
> > > > > > > >
> > > > > > > >
> > > > > > > > Example Code
> > > > > > > >
> > > > > > > > <DllImport("coredll.dll")> _
> > > > > > > > Private Shared Function CreateFile(ByVal lpFileName As
> > String,
> > > _
> > > > > > > > ByVal dwDesiredAccess As Integer, ByVal dwShareMode
As
> > > > > Integer,
> > > > > > _
> > > > > > > > ByVal lpSecurityAttributes As Integer, ByVal
> > > > > > dwCreationDisposition
> > > > > > > > As Integer, _
> > > > > > > > ByVal dwFlagsAndAttributes As Integer, ByVal
> > hTemplateFile
> > > > As
> > > > > > > > Integer) As Integer
> > > > > > > > End Function
> > > > > > > > <DllImport("coredll.dll")> _
> > > > > > > > Private Shared Function DeviceIoControl( _
> > > > > > > > ByVal hDevice As Int32, ByVal dwIoControlCode
As
> > > Int32,
> > > > _
> > > > > > > > ByRef lpInBuffer As Int32, ByVal nInBufferSize
As
> > > Int32,
> > > > _
> > > > > > > > ByRef lpOutBuffer As String, ByVal
nOutBufferSize
> As
> > > > > Int32,
> > > > > > _
> > > > > > > > ByRef lpBytesReturned As Int32, ByRef
> lpOverlapped
> > As
> > > > > > Int32)
> > > > > > > As
> > > > > > > > Int32
> > > > > > > > End Function
> > > > > > > > <DllImport("coredll.dll")> _
> > > > > > > > Private Shared Function WriteFile( _
> > > > > > > > ByVal hFile As Int32, ByVal Buffer As Byte(),
ByVal
> > > > > > > > nNumberOfBytesToWrite As Int32, _
> > > > > > > > ByVal lpNumberOfBytesWritten As Int32, ByVal
> overlapped
> > > As
> > > > > > Int32)
> > > > > > > > As Int32
> > > > > > > > End Function
> > > > > > > >
> > > > > > > > Function PrinterDeviceIO()
> > > > > > > > idPort = CreateFile("COM9:", GENERIC_READ Or
> GENERIC_WRITE,
> > 0,
> > > > 0,
> > > > > > > > OPEN_EXISTING, 0, 0)
> > > > > > > >
> > > > > > > > intBF = DeviceIoControl(idPort, FILE_GENERIC_WRITE,
> 2048,
> > > 1,
> > > > > > > > strValue, strValue.Length, intReturn, intOver)
> > > > > > > > End Function
> > > > > > > >
> > > > > > > > Function PrinterWriter()
> > > > > > > > idPort = CreateFile("COM9:", GENERIC_READ Or
> GENERIC_WRITE,
> > 0,
> > > > 0,
> > > > > > > > OPEN_EXISTING, 0, 0)
> > > > > > > >
> > > > > > > > intBF = WriteFile(idPort, bytBuffer, bytBuffer.Length,
> 1024,
> > > 0)
> > > > > > > > End Function
> > > > > > > >
> > > > > > > >
> > > > > > > >
> > > > > > > >
> > > > > > > >
> > > > > > >
> > > > > > >
> > > > > >
> > > > > >
> > > > >
> > > > >
> > > >
> > > >
> > >
> > >
> >
> >
>
>
- Next message: Brad Combs: "Re: GEODE"
- Previous message: Barbara: "Embedded spyware in registry"
- In reply to: Slobodan Brcin \(eMVP\): "Re: Open port USB with vb.net in PDA | Abrir el puerto USB con vb.net en PDA"
- Next in thread: Slobodan Brcin \(eMVP\): "Re: Open port USB with vb.net in PDA | Abrir el puerto USB con vb.net en PDA"
- Reply: Slobodan Brcin \(eMVP\): "Re: Open port USB with vb.net in PDA | Abrir el puerto USB con vb.net en PDA"
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