serial ports

[danielflerisoler]

Access to the port 'COM4' is denied (vb.net). i tried the /noSerialMice switch in boot.ini. the 1st string i sent was ok then the second says the port is closed (which it wasn't) and cannot be opened (by the SAME application. anyone?

[Plater]

Uhh well I guess first things first
Do you HAVE a COM4?
Are you sure it's not in use by anything else (Modem/internal/external device)?
It's not open already, say in a hyperterminal window?

[danielflerisoler]

Uhh well I guess first things first
Do you HAVE a COM4?
Are you sure it's not in use by anything else (Modem/internal/external device)?
It's not open already, say in a hyperterminal window?

hi! aha com4 exists. there's no modems or anything and no other apps incl hyperterminal using it. thing is i send the 1st command (device in question is a card reader) to initialise it... that's ok, response and all but the second time i try to send something, the port's .isopened value is false so i can't send. i try opening the port but get the 'Access to the port 'COM4' is denied.' error. i don't know why it's closed in the 1st place.

[Plater]

An error occured would be my guess.
The card reader doesn't have any other drivers that windows might try and use does it?
Is your hardware/software handshaking in the right state?
(i.e probably OFF?)

[danielflerisoler]

actually it doesn't. interestingly enough, the same code in VB6 works fine! :s

[danielflerisoler]

An error occured would be my guess.
The card reader doesn't have any other drivers that windows might try and use does it?
Is your hardware/software handshaking in the right state?
(i.e probably OFF?)

the problem was i was initiating a new class with the same port number more than once! thanks anyway