Delphi Com Port Sample
Hello,how can I detect all available COM-Ports? Is this somewhere stored inthe registry?
If yes, where is it? If not, is there any other known method?How does it come that a USB-Port extender with an builtin RS232 alwaysgets another RS232 port number if attached to another USB-Host on thesame PC? And why are the other previously uses COM-ports then reservedwhen the device is moved to another USB-socket?
Is this the driver ofthe device, or is this windows? And how to detect whether a found portis reserved or not?GreetingsMarkus.
Quote Markus Humm wrote: Hello, how can I detect all available COM-Ports? Is this somewhere stored in the registry? If yes, where is it? If not, is there any other known method?
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How does it come that a USB-Port extender with an builtin RS232 always gets another RS232 port number if attached to another USB-Host on the same PC? And why are the other previously uses COM-ports then reserved when the device is moved to another USB-socket? Is this the driver of the device, or is this windows? And how to detect whether a found port is reserved or not? Greetings MarkusThis will enumerate the ports.
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Call it from a loop of from say 1 to 16 orwhatever the highst number you would expect. Put windows in the uses clause.Sorry I cannot answer your other questions.MikeRfunction Tfrm1.ComPortExists(port: integer): Boolean;varudtComConfig: TCommConfig;lUDTSize: DWord;pname: pchar;tmp: string;constCOMportMask = 'COM%u';begintmp:= SysUtils.Format(COMportMask, Port);lUDTSize:= Sizeof(CommConfig);pname:= PChar(tmp);Result:= GetDefaultCommConfig(pname, udtComConfig, lUDTSize);end.
Quote MikeR wrote: This will enumerate the ports. Call it from a loop of from say 1 to 16 or whatever the highst number you would expect. Put windows in the uses clause. Sorry I cannot answer your other questions.
MikeR function Tfrm1.ComPortExists(port: integer): Boolean; var udtComConfig: TCommConfig; lUDTSize: DWord; pname: pchar; tmp: string; const COMportMask = 'COM%u'; begin tmp:= SysUtils.Format(COMportMask, Port); lUDTSize:= Sizeof(CommConfig); pname:= PChar(tmp); Result:= GetDefaultCommConfig(pname, udtComConfig, lUDTSize); end;That will show only ports named COM., which is typical, but notguaranteed. In reality, they can be named anything. Some modem driverswill name the port odd names, for example, like MODEM1.This will pull the port list from the registry:Function EnumPorts: TStrings;Var I: Integer;N: TStringList;BeginN:= TStringList.Create;With TRegistry.create DotryRootKey:= HKEYLOCALMACHINE;Access:= KEYREAD;If keyexists('HARDWAREDEVICEMAPSERIALCOMM') ThenIf openkey('HARDWAREDEVICEMAPSERIALCOMM', False) ThenBeginGetValueNames(N);For I:= 0 to N.count - 1 doNI:= ReadString(NI);N.Sort;Endfinallyfree;Result:= N;end;End;Modify as needed. Don't forget to free the returned stringlist when youare through with it.HTH,Jeff.P.S. Code probably came from Peter Below, but I have forgotten exactlywhen/where I got it. Quote Jeff Wormsley wrote: That will show only ports named COM., which is typical, but not guaranteed.
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In reality, they can be named anything. Some modem drivers will name the port odd names, for example, like MODEM1. This will pull the port list from the registry: Function EnumPorts: TStrings; Var I: Integer; N: TStringList; Begin N:= TStringList.Create; With TRegistry.create Do try RootKey:= HKEYLOCALMACHINE; Access:= KEYREAD; If keyexists('HARDWAREDEVICEMAPSERIALCOMM') Then If openkey('HARDWAREDEVICEMAPSERIALCOMM', False) Then Begin GetValueNames(N); For I:= 0 to N.count - 1 do NI:= ReadString(NI); N.Sort; End finally free; Result:= N; end; End; Modify as needed. Don't forget to free the returned stringlist when you are through with it. HTH, Jeff. P.S.
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Code probably came from Peter Below, but I have forgotten exactly when/where I got it.Good point Jeff.