\n \n<\/p>\n
\nThis example works by looking for a specific USB device VID and PID and was made to work with devices using Microchips USB CDC USB firmware stack. However it will work with all sorts of USB devices.\n<\/p>\n
\r\n\r\n\tusing namespace System::IO::Ports;\t\t\/\/< Needed for USB serial port\r\n\tusing namespace Microsoft::Win32;\t\t\/\/< Needed to access registry\r\n<\/code><\/pre>\n\r\n\r\n\tint Count;\r\n\tint CharPosn;\r\n\tint CheckEachPortCount;\r\n\tString ^RegistryMainFolder;\r\n\tString ^Port;\r\n\tarray<String^> ^Names;\r\n\tString ^Name;\r\n\tarray<String^> ^FoundCommPorts = gcnew array<String^>(0);\r\n\r\n\r\n\t\/\/----- FIND OUR USB SERIAL PORT DEVICE -----\r\n\ttry\r\n\t{\r\n\t\t\/\/----- DISCOVER ALL AVAILABLE SERIAL PORTS -----\r\n\t\tarray<String^> ^AvailableSerialPorts;\r\n\t\t AvailableSerialPorts = SerialPort::GetPortNames();\r\n\r\n\t\t\/\/>>>>>>>>>>>>>>>> DEBUG SIMULATE COM PORT CONNECTED\r\n\t\t\/\/Array::Resize(AvailableSerialPorts, AvailableSerialPorts->Length + 1);\r\n\t\t\/\/AvailableSerialPorts[AvailableSerialPorts->Length - 1] = "COM3";\r\n\t\t\/\/<<<<<<<<<<<<<<<<<<<\r\n\r\n\t\t\/\/----- CHECK REGISTRY TO FIND MATCHING USB DEVICES AND ONLY INCLUDE THOSE COMM PORTS -----\r\n\t\t\/\/(We only show comm ports for our devices that are currently connected)\r\n\t\t\/\/This is the registry path we're interested\r\n\t\t\/\/HKEY_LOCAL_MACHINE\\SYSTEM\\CurrentControlSet\\Enum\\USB\\[VID_VID+PID_PID]\\[RandomName]\\DeviceParameters\\PortName\r\n\r\n\t\t\/\/Retrieve all the subkeys for the specified key.\r\n\t\tRegistryMainFolder= L"SYSTEM\\\\CurrentControlSet\\\\Enum\\\\USB";\r\n\t\tRegistryKey ^rkey = Registry::LocalMachine;\r\n\t\trkey = rkey->OpenSubKey(RegistryMainFolder);\r\n\t\tNames = rkey->GetSubKeyNames();\r\n\r\n\t\tfor each (Name in Names)\r\n\t\t{\r\n\t\t\t\/\/----- CHECK NEXT USB DEVICE IN THE REGISTRY -----\r\n\t\t\t\/\/This example is based on finding only devices where the USB name includes a specific VID and PID value like this:\r\n\t\t\t\/\/name = VID_04D8&PID_F677\r\n\r\n\t\t\tif (\r\n\t\t\t\t(Name->Contains("VID_04D8")) &&\t\t\/\/<<<<<<< OUR VID VALUE OUR USB DEVICE NAME WILL CONTAIN\r\n\t\t\t\t(Name->Contains("PID_F677"))\t\t\/\/<<<<<<< OUR PID VALUE OUR USB DEVICE NAME WILL CONTAIN\r\n\t\t\t)\r\n\t\t\t{\r\n\t\t\t\t\/\/----- THIS REGISTRY ENTRY LISTS ALL USB DEVICES WITH OUR VID AND PID -----\r\n\t\t\t\tRegistryKey ^rkey2 = Registry::LocalMachine;\r\n\t\t\t\trkey2 = rkey2->OpenSubKey(RegistryMainFolder);\r\n\t\t\t\trkey2 = rkey2->OpenSubKey(Name);\r\n\t\t\t\tNames = rkey2->GetSubKeyNames();\r\n\t\t\t\tfor each (Name in Names)\r\n\t\t\t\t{\r\n\t\t\t\t\t\/\/----- GET NEXT USB DEVICE ENTRY -----\r\n\t\t\t\t\ttry\r\n\t\t\t\t\t{\r\n\t\t\t\t\t\tRegistryKey ^rkey3 = Registry::LocalMachine;\r\n\t\t\t\t\t\trkey3 = rkey2->OpenSubKey(Name + L"\\\\Device Parameters");\r\n\t\t\t\t\t\tPort = Convert::ToString(rkey3->GetValue("PortName"));\t\t\t\/\/Will be "COM1" etc\r\n\r\n\t\t\t\t\t\t\/\/IS THIS USB DEVICE CURRENTLY CONNECTED?\r\n\t\t\t\t\t\tfor (CheckEachPortCount = 0; CheckEachPortCount < AvailableSerialPorts->Length; CheckEachPortCount++)\r\n\t\t\t\t\t\t{\r\n\t\t\t\t\t\t\tif (AvailableSerialPorts[CheckEachPortCount]->ToString() == Port->ToString())\r\n\t\t\t\t\t\t\t{\r\n\t\t\t\t\t\t\t\t\/\/THIS PORT EXISTS SO DEVICE IS CONNECTED - ADD IT TO THE ARRAY OF FOUND DEVICES\r\n\t\t\t\t\t\t\t\tArray::Resize(FoundCommPorts, FoundCommPorts->Length + 1);\r\n\t\t\t\t\t\t\t\tFoundCommPorts[FoundCommPorts->Length - 1] = Port;\r\n\t\t\t\t\t\t\t\tbreak;\r\n\t\t\t\t\t\t\t}\r\n\t\t\t\t\t\t}\r\n\t\t\t\t\t\trkey3->Close();\r\n\t\t\t\t\t}\r\n\t\t\t\t\tcatch(System::Exception ^)\r\n\t\t\t\t\t{\r\n\t\t\t\t\t}\t\t\t\t\t\t\r\n\t\t\t\t}\r\n\t\t\t\trkey2->Close();\r\n\t\t\t}\r\n\t\t}\r\n\t\trkey->Close();\r\n\r\n\t\t\/\/ADD EACH OF THE FOUND DEVICES TO THE COMM PORT COMBO BOX\r\n\t\tif (FoundCommPorts->Length)\r\n\t\t{\r\n\t\t\tArray::Sort(FoundCommPorts);\t\t\/\/Sort by port number\r\n\r\n\t\t\tfor (Count = 0; Count < FoundCommPorts->Length; Count++)\r\n\t\t\t{\r\n\t\t\t\tcmbCommPort->Items->Add(FoundCommPorts[Count]);\r\n\t\t\t}\r\n\r\n\t\t}\r\n\t}\r\n\tcatch(System::Exception^ e)\r\n\t{\r\n\t\t\/\/MessageBox::Show(L"Error looking for USB device:\\n" + e, L"Error", MessageBoxButtons::OK, MessageBoxIcon::Error);\r\n\t}\r\n<\/code><\/pre>\n\n \n<\/p>\n
\n \n<\/p>\n
\n \n<\/p>\n
\n <\/p>\n","protected":false},"excerpt":{"rendered":"
How To Find Specific USB Devices That Are Connected This example works by looking for a specific USB device VID and PID and was made to work with devices using Microchips USB CDC USB firmware stack. However it will work with all sorts of USB devices. using namespace System::IO::Ports; \/\/< Needed for USB serial port […]<\/p>\n","protected":false},"author":5,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[57],"tags":[],"class_list":["post-866","post","type-post","status-publish","format-standard","hentry","category-serial-port"],"_links":{"self":[{"href":"https:\/\/ibex.tech\/visualcpp\/wp-json\/wp\/v2\/posts\/866","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/ibex.tech\/visualcpp\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/ibex.tech\/visualcpp\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/ibex.tech\/visualcpp\/wp-json\/wp\/v2\/users\/5"}],"replies":[{"embeddable":true,"href":"https:\/\/ibex.tech\/visualcpp\/wp-json\/wp\/v2\/comments?post=866"}],"version-history":[{"count":4,"href":"https:\/\/ibex.tech\/visualcpp\/wp-json\/wp\/v2\/posts\/866\/revisions"}],"predecessor-version":[{"id":1017,"href":"https:\/\/ibex.tech\/visualcpp\/wp-json\/wp\/v2\/posts\/866\/revisions\/1017"}],"wp:attachment":[{"href":"https:\/\/ibex.tech\/visualcpp\/wp-json\/wp\/v2\/media?parent=866"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/ibex.tech\/visualcpp\/wp-json\/wp\/v2\/categories?post=866"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/ibex.tech\/visualcpp\/wp-json\/wp\/v2\/tags?post=866"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}