Re: Open port USB with vb.net in PDA | Abrir el puerto USB con vb.net en PDA
From: Slobodan Brcin \(eMVP\) (sbrcin_at_ptt.yu)
Date: 04/27/04
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Date: Wed, 28 Apr 2004 01:58:24 +0200
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
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"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: Ann Adamson: "tasklist and taskkill"
- Previous message: Sean Gahan: "Re: Open port USB with vb.net in PDA | Abrir el puerto USB con vb.net en PDA"
- In reply to: Sean Gahan: "Re: Open port USB with vb.net in PDA | Abrir el puerto USB con vb.net en PDA"
- Next in thread: Sean Gahan: "Re: Open port USB with vb.net in PDA | Abrir el puerto USB con vb.net en PDA"
- Reply: Sean Gahan: "Re: Open port USB with vb.net in PDA | Abrir el puerto USB con vb.net en PDA"
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