main.cpp

#include <windows.h>
#include <Setupapi.h>
#include <stdio.h>
#include <tchar.h>
#include <cfgmgr32.h>
#include <devguid.h>
#include <string>
#pragma comment(lib,"setupapi.lib")
using namespace std;

#define WIN32_LEAN_AND_MEAN

typedef basic_string<TCHAR> tstring;
DEFINE_GUID(GUID_DEVCLASS_BLUETOOTH, {0xe0cbf06cL, 0xcd8b, 0x4647, {0xbb, 0x8a, 0x26, 0x3b, 0x43, 0xf0, 0xf9, 0x74}});


LPTSTR GetGenericBluetoothAdapterInstanceID(void)
{
    unsigned i;
    CONFIGRET r;
    HDEVINFO hDevInfo;
    SP_DEVINFO_DATA DeviceInfoData;
    PTSTR deviceInstanceID = new TCHAR[MAX_DEVICE_ID_LEN];

    // Find all bluetooth radio modules
    hDevInfo = SetupDiGetClassDevs(&GUID_DEVCLASS_BLUETOOTH, NULL, NULL, DIGCF_PRESENT);

    if (hDevInfo == INVALID_HANDLE_VALUE)
        return NULL;

    // Get first Generic Bluetooth Adapter InstanceID
    for (i = 0; ; i++)
    {
        DeviceInfoData.cbSize = sizeof (DeviceInfoData);

        if (!SetupDiEnumDeviceInfo(hDevInfo, i, &DeviceInfoData))
            break;

        r = CM_Get_Device_ID(DeviceInfoData.DevInst, deviceInstanceID , MAX_PATH, 0);

        if (r != CR_SUCCESS)
            continue;

        if (_tcsncmp(_TEXT("USB"), deviceInstanceID, 3) == 0)
        {
            return deviceInstanceID;
        }
    }

    return NULL;
}

void find_and_replace(LPTSTR source, LPCTSTR strFind, LPCTSTR strReplace)
{
    tstring s = tstring(source);
    tstring f = tstring(strFind);
    tstring r = tstring(strReplace);
    size_t j;

    for ( ; (j = s.find( f )) != string::npos ; )
    {
        s.replace( j, f.length(), r );
    }

    _tcscpy(source, s.c_str());
}

int _tmain(int argc, TCHAR *argv[])
{
    if ( argc != 2 )
    {
        _tprintf( TEXT("Invalid parameters number. "
            TEXT("Usage: Bthrmmodifier.exe <radio module local name>\n")));
        return 1;
    }

    LPTSTR instanceID = GetGenericBluetoothAdapterInstanceID();

    if (instanceID == NULL)
    {
        _tprintf(_TEXT("Failed to get Generic Bluetooth Adapter InstanceID\n"));
        return 1;
    }

    LPTSTR instanceIDModified = new TCHAR[_tcslen(instanceID)];
    _tcscpy(instanceIDModified, instanceID);
    find_and_replace(instanceIDModified, _TEXT("\\"), _TEXT("#"));

    HANDLE hDevice;
    TCHAR fileName[1024] = { 0 };
    _tcscpy(fileName, _TEXT("\\\\.\\"));
    _tcscat(fileName, instanceIDModified);
    _tcscat(fileName, _TEXT("#{a5dcbf10-6530-11d2-901f-00c04fb951ed}"));

    hDevice = CreateFile(fileName, GENERIC_WRITE, 0, NULL, OPEN_EXISTING, 0, NULL);

    if (hDevice == INVALID_HANDLE_VALUE)
    {
        _tprintf(_TEXT("Failed to open device. Error code: %d\n"), GetLastError());
        return EXIT_FAILURE;
    }

    //Change radio module local name in registry
    LPTSTR RMLocalName = argv[1];
    CHAR bufRMLocalName[256];

    int nLength = WideCharToMultiByte(CP_UTF8, 0, RMLocalName,
        -1, NULL, 0, NULL, NULL);
    WideCharToMultiByte(CP_UTF8, 0, RMLocalName,
        -1, bufRMLocalName, nLength, NULL, NULL);

    HKEY hKey;
    TCHAR rmLocalNameKey[1024] = { 0 };
    LSTATUS ret;
    _tcscpy(rmLocalNameKey, _TEXT("SYSTEM\\ControlSet001\\Enum\\"));
    _tcscat(rmLocalNameKey, instanceID);
    _tcscat(rmLocalNameKey, _TEXT("\\Device Parameters"));

    ret = RegOpenKeyEx(HKEY_LOCAL_MACHINE, rmLocalNameKey,
        0L, KEY_SET_VALUE , &hKey);

    if(ret != ERROR_SUCCESS)
    {
        _tprintf(TEXT("Failed to open registry key. Error code: %d\n"), ret);
        return EXIT_FAILURE;
    }

    ret = RegSetValueEx(hKey, _TEXT("Local Name"), 0, REG_BINARY,
        (LPBYTE)bufRMLocalName, nLength);

    if (ret != ERROR_SUCCESS)
    {
        _tprintf(TEXT("Failed to set registry key. Error code: %d\n"), ret);
        return EXIT_FAILURE;
    }

    RegCloseKey(hKey);

    // This check decides what IO control code to use based on if we're in XP or Vista (and later).
    OSVERSIONINFO osver;
    osver.dwOSVersionInfoSize = sizeof(osver);
    GetVersionEx(&osver);

    UINT ctlCode = (UINT)(6 > osver.dwMajorVersion ? 0x220fd4 : 0x411008);
    long reload = 4;  // tells the control function to reset or reload or similar...
    DWORD bytes = 0; // merely a placeholder

    // Send radio module driver command to update device information
    if (!DeviceIoControl(hDevice, ctlCode, &reload, 4, NULL, 0, &bytes, NULL))
    {
        _tprintf(TEXT("Failed to update radio module local name. Error code: %d\n"), GetLastError());
        return EXIT_FAILURE;
    }

    _tprintf(TEXT("Done\n"));

    return EXIT_SUCCESS;
}