🚀 go-pugleaf

Holy..... can't believe I did
that. Saw COM and thought it was
COM port...

That dreaded COM.



Peter Stefanos wrote:
> Colin B Maharaj wrote:
>>
>> Firstly, sorry the code is poorly designed, but works!
>> I cut and paste from some code I have. Call EnumSerialPorts() and
>> return it into an AnsiString. The return value is a csv list of the
>> COM ports that exists. NOTE: This code does not say if it is in use.
>>
>> If you call code to open a comport and it cannot be opened then
>> either it is in use or it does not exists.
>>
> 
> Ahhh you mean COM Port.
> 
> You can test the existance of a COM port using the CreateFile() function.
> 
> Here's a simple function to test if a COM port exists. (It's a little 
> crude)
> 
> bool ComPortExists(int ComPortNumber)
> {
>   HANDLE Handle;
>   char Buffer[100];
>   bool Ret = false;
> 
>   sprintf(Buffer, "\\\\.\\COM%d", ComPortNumber);
>   Handle = CreateFile(Buffer, 0, 0, 0, OPEN_EXISTING,
>     FILE_ATTRIBUTE_NORMAL, 0);
>   // Notes: If Handle == INVALID_HANDLE_VALUE *AND*
>   // if errno == 5 the port does exist, but cannot be opened ...
>   // if errno == 2 doesn't exist, otherwise error.
>   if ((Handle != INVALID_HANDLE_VALUE) || (GetLastError() == 5)) {
>     CloseHandle(Handle); // Not sure if this is necessary. Probably not.
>     Ret = true;
>   }
>   return Ret;
> }