Using parallel port to output to a connected circuit in VB6

[mayan]

hi!hope somebody can help me..
im currently involved in a project that uses VB6 in Windows XP to lock/unlock the door. There is a barcode reader connected to the serial port which accepts/scan the barcode number and verifies if it is valid and is in the database.by the way,the door can be locked/unlocked only by authorized persons.So if the barcode is correct, the circuit connected in the parallel port will activate or lock/unlock the door..since i am a beginner in vb6 interfacing,i downloaded a simple program which lights up a LED connected to the port.but the problem is,an error message of 'Sub or Function not defined' appears when i run the program..i dont know whaT caused this or how to solve it since i already copied the inpout32.dll into the /systems32/drivers of my pc and declared the necessary declarations (which is also in the downloaded program) in a module..please,somebody help me... thanks!

[flyingman]

I use VB6 with IO.dll to write to EPROM by LPT port.
I have a problem with reading data from EPROM. Can anyone help me? Thanks

[lionking]

[quote="an error message of 'Sub or Function not defined' appears when i run the program..i dont know whaT caused this or how to solve it since i already copied the inpout32.dll into the /systems32/drivers of my pc and declared the necessary declarations (which is also in the downloaded program) in a module..please,somebody help me... thanks![/quote]

may I know what error message did you got ? thanks.

dan

[matthew]

inpout32.bas

Add a new module to your project and call it inpout32.bas (or just download it from www.lvr.com - it comes as part of the Parallel Port Complete disk/book - The book is really really useful, I've got 2 of Jan's books and I'm about to order a third).

In the module you need to put the following code:


'Inp and Out declarations for port I/O using inpout32.dll.

Public Declare Function Inp Lib "inpout32.dll" Alias "Inp32" _
(ByVal PortAddress As Integer) _
As Integer

Public Declare Sub Out Lib "inpout32.dll" Alias "Out32" _
(ByVal PortAddress As Integer, _
ByVal Value As Integer)

This declares the functions in the dll, you will need to do this for all your projects. I suggest you keep a copy of inpout32.dll in c:\windows\system\ or just the windows dir. (It might work from the drivers folder but I'm not sure).

Hope this helps.

Matthew