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- !!NEWSFLASH!!
- !List of Errors Returned from pGetLastError
- Can you do a FileCopy to an Active Port
- Capture Caller ID Information from a Modem
- Comport Being Accessed by More than one Program
- Default X-10 Monitor Sample Code
- Detect if a Line is Busy
- Detecting Valid COM Ports
- Digital Multimeters with Serial Ports
- Direct Serial Connection - No Modem
- Framing Error with Serial Extender
- Hardware Overrun Error
- How to Force a Modem to Continue
- How to Handle the Multiple Downloads with pRecvFile
- Kermit Type Transfers
- Paging and pPutLine
- pComControl
- pComOpen Error 100
- pModemDial Clicking but not Audibly Dialing
- pRecFile Failure
- pSendFile bad port handle
- Receiving Mouse Button Info on Serial Port
- Receiving Parity Error with pRecvFile
- Send Power On Hex Command to a Nec Display
- Sending Control Characters to Com Port
- Serial Communications Problems with pWaitfor
- Serial Extender - Timeouts - Boxes Functions
- Serial Extender and PPP connections
- Serial Modem Transferring Files
- Uploading Text Files using Serial Extender
- Using pCapture to Capture Log
- VT100 Emulation - ANSI chars and Serial Extender
- X-10 Control Sample Script II
- X-10 Control Sample Script
- X-10 FAQ
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How to Detect Valid COM Ports
Keywords: pComOpen pGetLastError(1)
Question:
I want to be able to search for a modem on COM ports 1-4. If a modem isn't found on any of those ports, I'll display a message to that effect. But if I get all the way to COM4 without finding a modem, I get a WIL error I don't understand. Here's the relevant part of the batch:
display(3,"Please wait...","Looking for modem on COM4")
port=pComOpen("COM4",0,9600,"8N1","XONXON")
pPutString(port,"ATZ")
pPutString(port,@cr)
if pWaitFor(port,"OK","",0,3000)==0
pComClose(port,-1)
goto NO_MODEM
else
ComPort=4
goto SHOWCOMPORT
endif
goto NO_MODEM
The error message is:
WIL Extender Error---------
port=pComOpen("COM4",0,9600,"8N1","XONXON")
Winbatch 32.97D
WIL Version 2.4dbp
There is no number in the Error Message, only a series of dashes.
The PC on which this error message was generated does not have a COM4, but I've
tested the same script on a PC that does, and get the same message. Is there a way to
check either the validity of a COM port, or for an error message from pComOpen() ?
Answer:
Try the following code instead...
;=======================snip===========================
DirChange("c:\program files\WinBatch\system")
AddExtender("wwser34I.dll")
debug(1)
display(3,"Please wait...","Looking for modem on COM4")
ErrorMode(@off)
port=pComOpen("COM4",0,9600,"8N1","XONXON")
ErrorMode(@cancel)
code=pGetLastError(1)
Message("Open err msg",code)
if port==- then exit
pPutString(port,"ATZ")
pPutString(port,@cr)
if pWaitFor(port,"OK","",0,3000)==0
pComClose(port,-1)
goto NO_MODEM
else
ComPort=4
goto SHOWCOMPORT
endif
goto NO_MODEM
;=======================================================
After capturing the error code, do a StrIndex to test whether the
code indicated an invalid port. Works great.
Article ID: W12570
Filename: Detecting Valid COM Ports.txt
File Created: 2001:03:01:15:25:26
Last Updated: 2001:03:01:15:25:26