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TStringList* availableComPorts = new TStringList(); 
TRegistry *Registry = new TRegistry(KEY_READ); 
AnsiString portNb =""; 
  
Registry->RootKey = HKEY_LOCAL_MACHINE; 
// The com ports are administered in the following directory. 
// false, because no entry is supposed to be created. 
Registry->OpenKey("HARDWARE\\DEVICEMAP\\SERIALCOMM", false); 
  
// Extract the COM port names and store them. 
Registry->GetValueNames(availableComPorts); 
// List the available COM ports in the corresponding combo box. 
for (int i(0); i < availableComPorts->Count; i++) 
{ 
    portNb = Registry->ReadString(availableComPorts->Strings[i]); 
    ComboBox1->AddItem(portNb, NULL); 
} 
delete Registry; 
delete availableComPorts;