Close COM port

[Champak]

Is there a way to close a specific COM port that is in use...not in use by my script? I've looked at the commg udf, but see nothing of use for me.

[Blue_Drache]

As martin is actively developing this, I think I'd have to defer to him and possibly ask in his if this is a feature he could add.

[atzoref]

I have the same question,

How can I Open/Close a specific ComPort?

[FireFox]

Hi,

Code from MKISH :

#include <WinAPI.au3>
$RESULT = _WinAPI_CreateFile(".COM3", 2, 2)
If $RESULT = 0 then
msgbox(16, "", "Port not available, please plug in your device")
EndIf

This is for opening the COM port 3, maybe to close a port you have to open and close it.

Hope that helps.

Br, FireFox.

[stormbreaker]

Some extension to above:

#include <WinAPI.au3>
$RESULT = _WinAPI_CreateFile(".COM3", 2, 2)
msgbox(64, "", "Port opened.")
_WinAPI_CloseHandle($RESULT)
msgbox(64, "", "Handle closed.")

[AlainB]

Hi,

It is not working for me, I mean for the closing of the port. For the opening, It is working well.

What could be the problem?

Alain

#include <WinAPI.au3>

Global $Port = "COM1"

_OpenAndClosePort()

Func _OpenAndClosePort()

$Open = _WinAPI_CreateFile($Port, 2, 2)

If $Open = False then
msgbox(0, "", "The port is not open" ,3)
Exit
EndIf

msgbox(0, "", "The port is open",2)

$Closed =_WinAPI_CloseHandle($Port)

If $Closed = False then
msgbox(0, "", "The port is not closed",3)
Exit
EndIf

msgbox(0, "", "The port is closed",3)

EndFunc

Edited September 22, 2012 by AlainB

[stormbreaker]

_WinAPI_CloseFile() closes a handle created with _WinAPI_CreateFile() (or so). So, you need to do something like:

_WinAPI_CloseFile($Open)

AND NOT: _WinAPI_CloseFile($Port)

Hope, all's clear now...

[AlainB]

Thank you MKISH, very informative post, as usual.

It is working now. Here is the edited code:

#include <WinAPI.au3>

Global $Port = "COM1"

_OpenAndClosePort()

Func _OpenAndClosePort()
Local $Port1 = _WinAPI_CreateFile($Port, 2, 2)

If $Port1 = False then
msgbox(0, "", "The port is not open" ,3)
exit
EndIf

msgbox(0, "", "The port is open",2)

Local $Closed =_WinAPI_CloseHandle($Port1)

if $Closed = False then
msgbox(0, "", "The port is not closed",3)
exit
EndIf

msgbox(0, "", "The port is closed",3)
EndFunc

(On edit: It is working for me with _WinAPI_CloseHandle but not with _WinAPI_CloseFile. Is this a typo? It gives the error Unknown function name.)

Edited September 23, 2012 by AlainB

[stormbreaker]

The error speaks for itself: There is no such function defined in WinAPI UDF (or in Windows probably)

[AlainB]

Yes, it is true... when you have acquired a sufficient knowledge on how Autoit is working. The concept of including UDF in a script and what it is doing is not necessary very obvious for a newbee. If one know, he could go under the "Include" sub directory of autoit and see that there is a file called WINAPI.AU3 among many other ones. Opening this file, he will see that the content is a set of functions that may be used when the file is included in a script. When you know all that then yes...the error speaks for itself.

Just taking this occasion to try to explain a bit what are included files for others newbees like me. All this is probably in a help file somewhere anyway.

Edited September 24, 2012 by AlainB