Enum com ports ignore modems etc

Thread View: borland.public.cppbuilder.nativeapi

3 messages

[T] Back to Threads [V] Tree View [G] Group Articles

3 total messages Started by northern_RATT Thu, 29 Nov 2007 04:25

#995

Author: northern_RATT
Date: Thu, 29 Nov 2007 04:25

17 lines
1353 bytes

Hi Folks;

I need to populate a menu w/ 
available COM ports. I know how to 
do this with CreatFile(dwAccess=0).
Fine & Dandy, But if this port is 
attached to a modem, IR port, 
Bluetooth device then I want to 
skip it. I'm only interested in 
RS232, 9 pin D connector, COM 
ports. So my question is: If I get 
a valid handle back form CreateFile 
is there a good way to determine 
what is on the other end?

Thanks
Drew

Re: Enum com ports ignore modems etc

#997

Author: Colin B Maharaj
Date: Thu, 29 Nov 2007 23:39

124 lines
4411 bytes

Nope, you may need to do some further digging
to enumerate modems in the registry, then probably
subtract this from all available ports.

I have some quick and dirty code to enumerate
existing COM ports, weather open or not.
However, it is not perfect, and you will need to
clean it up yourself. :)

Good luck....

//-----------------------------------------------------------------------------

bool COM1,COM2,COM3,COM4,COM5,COM6,COM7,COM8;

bool COMExists(char *ComStr)
{
    HKEY hKey;
    DWORD keyType   = 0;
    DWORD retValue  = 0;
    DWORD keyLength = 0;
    char *t = new char [MAX_PATH];
    char *CV = new char [256];
    strcpy(CV, "Hardware\\DeviceMap\\SerialComm"); // safe
    retValue = RegOpenKeyEx(HKEY_LOCAL_MACHINE, CV, NULL, KEY_READ, &hKey);
    if (retValue != ERROR_SUCCESS)
    {
      delete []CV;
      delete []t;
      return false;
    }
    RegQueryValueEx(hKey, ComStr, NULL, &keyType, NULL, &keyLength);
    retValue = RegQueryValueEx(hKey, ComStr, NULL, &keyType, (UCHAR *)t, 
&keyLength);
    RegCloseKey(hKey);

    if (retValue != ERROR_SUCCESS)
    {
       delete []CV;
       delete []t;
       return false;
    }
    if (strcmp(t, "COM1")==0) COM1 = true;
    if (strcmp(t, "COM2")==0) COM2 = true;
    if (strcmp(t, "COM3")==0) COM3 = true;
    if (strcmp(t, "COM4")==0) COM4 = true;
    if (strcmp(t, "COM5")==0) COM5 = true;
    if (strcmp(t, "COM6")==0) COM6 = true;
    if (strcmp(t, "COM7")==0) COM7 = true;
    if (strcmp(t, "COM8")==0) COM8 = true;
    delete []CV;
    delete []t;
    return true;
}

//-----------------------------------------------------------------------------

AnsiString EnumSerialPorts()
{
    AnsiString COMcsv = "";
   OSVERSIONINFO osv;
   osv.dwOSVersionInfoSize = sizeof(osv);
   GetVersionEx(&osv);
   if (osv.dwPlatformId == VER_PLATFORM_WIN32_NT)
    {
      COMExists("\\Device\\Serial0");
      COMExists("\\Device\\Serial1");
      COMExists("\\Device\\Serial2");
      COMExists("\\Device\\Serial3");
      COMExists("\\Device\\Serial4");
      COMExists("\\Device\\Serial5");
      COMExists("\\Device\\Serial6");
      COMExists("\\Device\\Serial7");
    }
    else
    {
      COMExists("COM1");
      COMExists("COM2");
      COMExists("COM3");
      COMExists("COM4");
      COMExists("COM5");
      COMExists("COM6");
      COMExists("COM7");
      COMExists("COM8");
    }
    if (COM1 == true) COMcsv = "COM1";
    if (COM2 == true) COMcsv += "\,COM2";
    if (COM3 == true) COMcsv += "\,COM3";
    if (COM4 == true) COMcsv += "\,COM4";
    if (COM5 == true) COMcsv += "\,COM5";
    if (COM6 == true) COMcsv += "\,COM6";
    if (COM7 == true) COMcsv += "\,COM7";
    if (COM8 == true) COMcsv += "\,COM8";

    return  COMcsv;
}

//-----------------------------------------------------------------------------





northern_RATT wrote:
> Hi Folks;
> 
> I need to populate a menu w/ 
> available COM ports. I know how to 
> do this with CreatFile(dwAccess=0).
> Fine & Dandy, But if this port is 
> attached to a modem, IR port, 
> Bluetooth device then I want to 
> skip it. I'm only interested in 
> RS232, 9 pin D connector, COM 
> ports. So my question is: If I get 
> a valid handle back form CreateFile 
> is there a good way to determine 
> what is on the other end?
> 
> Thanks
> Drew 
> 
>

Re: Enum com ports ignore modems etc

#947

Author: Boba
Date: Tue, 01 Jan 2008 04:16

5 lines
1134 bytes

"Colin B Maharaj" <noreply@myhost.com> wrote in message
news:474f4db2$1@newsgroups.borland.com...
> ...

just wondering what is the reason for you to use advapi and not kernel?

Thread Navigation

This is a paginated view of messages in the thread with full content displayed inline.

Messages are displayed in chronological order, with the original post highlighted in green.

Use pagination controls to navigate through all messages in large threads.

Back to All Threads