Search for a specific COM port on Win10

#include <windows.h>
#include <setupapi.h>
#include <stdio.h>
#include <devguid.h>
#include <wchar.h>

#define SEARCH_STRINT "Cinterion PLSx3 USB Com Port1 "


int main() {

    // Get a handle to a device information set for COM ports
    HDEVINFO hdevinfo;
    
    //GUID ClassGuid = {0x4d36e978,0xe325,0x11ce,{0xbf,0xc1,0x08,0x00,0x2b,0xe1,0x03,0x18}};
    GUID guid = {0x4d36e978,0xe325,0x11ce,{0xbf,0xc1,0x08,0x00,0x2b,0xe1,0x03,0x18}}; //GUID_DEVCLASS_PORTS
    
    //查到資料大多這樣寫，devguid.h也宣告了
    //但mingw64編譯卻一直說找不到GUID_DEVCLASS_USB @@
    //所以改用查guid碼方式來避開
    //hDevInfo = SetupDiGetClassDevs(&GUID_DEVCLASS_USB, 0, 0, DIGCF_PRESENT);
    
    
    hdevinfo = SetupDiGetClassDevs((LPGUID)&guid, NULL, NULL, DIGCF_PRESENT );

    if (hdevinfo == INVALID_HANDLE_VALUE) {
        printf("SetupDiGetClassDevs failed with error code %d\n", GetLastError());
        return 1;
    }

    // Enumerate through the COM ports
    SP_DEVINFO_DATA devinfoData;
    devinfoData.cbSize = sizeof(SP_DEVINFO_DATA);

    SP_DEVICE_INTERFACE_DATA interfaceData;
    interfaceData.cbSize = sizeof(SP_DEVICE_INTERFACE_DATA);

    DWORD index = 0;
    for(index=0; SetupDiEnumDeviceInfo(hdevinfo, index, &devinfoData); index++)
    {
        wchar_t friendlyName[128];

        if (SetupDiGetDeviceRegistryProperty(hdevinfo, &devinfoData, SPDRP_HARDWAREID, NULL, (BYTE*)friendlyName, sizeof(friendlyName), NULL))
        {
            // Check if the COM port information matches the USB modem's VID and PID
            //printf("friendlyName=%s\n", friendlyName);
            char cpy[128];
            char comport[COMPORT_SIZE];
            strcpy(cpy, (char *)friendlyName);
            //printf("%d. cpy=%s\n", (int)index, cpy);
            if (strcmp(cpy, SEARCH_STR0))
                continue;

            if (SetupDiGetDeviceRegistryProperty(hdevinfo, &devinfoData, SPDRP_FRIENDLYNAME, NULL, (BYTE*)friendlyName, sizeof(friendlyName), NULL))
            {
                strcpy(cpy, (char *)friendlyName);
                //printf("%d. cpy=%s\n", (int)index, cpy);

                char *p;
                p = strtok(cpy, SEARCH_STR2);
                for (; p != NULL; )
                {
                    //printf( "pp=%s\n", p );
                    p = strtok(NULL, "M");
                    if(p)
                        strncpy(comport, p, COMPORT_SIZE);
                }
            }
            //printf("p=%s, len=%zu\n", comport, strlen(comport));
            comport[strlen(comport)-1]='\0';
            //printf("comport=%s\n", comport);
            strcpy(com, comport);
            //printf("com=%s\n", com);
        }
    }

    // Clean up
    SetupDiDestroyDeviceInfoList(hdevinfo);

    return 0;
}

Ref: ChatGPT