How do I get the friendly name of a COM port in Windows?

Question

I have a GSM modem connected via USB. The modem creates 2 serial ports. The first is automatically attached to the modem, the second shows in Device Manager as \"HUAWEI Mo

Answer 1

The C++ version based on @Will Dean answer.

#include 
#include 
#include 
#include 

void enumerateSerialPortsFriendlyNames()
{
    SP_DEVINFO_DATA devInfoData = {};
    devInfoData.cbSize = sizeof(devInfoData);

    // get the tree containing the info for the ports
    HDEVINFO hDeviceInfo = SetupDiGetClassDevs(&GUID_DEVCLASS_PORTS,
                                               0,
                                               nullptr,
                                               DIGCF_PRESENT
                                               );
    if (hDeviceInfo == INVALID_HANDLE_VALUE)
    {
        return;
    }

    // iterate over all the devices in the tree
    int nDevice = 0;
    while (SetupDiEnumDeviceInfo(hDeviceInfo,            // Our device tree
                                 nDevice++,            // The member to look for
                                 &devInfoData))
    {
        DWORD regDataType;
        DWORD reqSize = 0;

        // find the size required to hold the device info
        SetupDiGetDeviceRegistryProperty(hDeviceInfo, &devInfoData, SPDRP_HARDWAREID, nullptr, nullptr, 0, &reqSize);
        BYTE* hardwareId = new BYTE[(reqSize > 1) ? reqSize : 1];
        // now store it in a buffer
        if (SetupDiGetDeviceRegistryProperty(hDeviceInfo, &devInfoData, SPDRP_HARDWAREID, ®DataType, hardwareId, sizeof(hardwareId) * reqSize, nullptr))
        {
            // find the size required to hold the friendly name
            reqSize = 0;
            SetupDiGetDeviceRegistryProperty(hDeviceInfo, &devInfoData, SPDRP_FRIENDLYNAME, nullptr, nullptr, 0, &reqSize);
            BYTE* friendlyName = new BYTE[(reqSize > 1) ? reqSize : 1];
            // now store it in a buffer
            if (!SetupDiGetDeviceRegistryProperty(hDeviceInfo, &devInfoData, SPDRP_FRIENDLYNAME, nullptr, friendlyName, sizeof(friendlyName) * reqSize, nullptr))
            {
                // device does not have this property set
                memset(friendlyName, 0, reqSize > 1 ? reqSize : 1);
            }
            // use friendlyName here
            delete[] friendlyName;
        }
        delete[] hardwareId;
    }
}