How To Make Sure That a Service is Removed When The Driver is Uninstalled or Upgraded (822445)

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HKEY hKey;
BOOL bNeedToUninstallService = FALSE;

switch(InstallFunction) {

    case DIF_DESTROYPRIVATEDATA :

        //
        // If the co-installer is being unloaded, and is no longer in the list of
        // device-specific co-installers for this device, then the driver is
        // being replaced (or the device is being uninstalled altogether).
        //
        hKey = SetupDiOpenDevRegKey(DeviceInfoSet,
                                    DeviceInfoData,
                                    DICS_FLAG_GLOBAL,
                                    0,
                                    DIREG_DRV,
                                    KEY_READ
                                   );

        if(hKey == INVALID_HANDLE_VALUE) {
            //
            // If you cannot open the key for read access, this most likely
            // means that the device's driver key has been deleted (typically,
            // because the device is being uninstalled).  Therefore, treat this 
            // the same as the scenario where the co-installer is no longer in 
            // the list.
            //
            bNeedToUninstallService = TRUE;

        } else {
            //
            // Retrieve the REG_MULTI_SZ list of co-installers from the 
            // CoInstallers32 value entry, and then look for the co-installer 
            // module/entry-point in the list.
            //
            bNeedToUninstallService = !CoinstallerStillInList(hKey, "CoInstallers32");

            RegCloseKey(hKey);
        }

        if(bNeedToUninstallService) {

            <TO-DO: check service ref-count and uninstall service if necessary>
        }

        return NO_ERROR;
}