C++ (Cpp) string::substr Examples

Example #1

File: install_svc.cpp Project: FirebirdSQL/firebird

static USHORT svc_query_ex(SC_HANDLE manager)
{
/**********************************************
 *
 *	s v c _ q u e r y _ e x
 *
 **********************************************
 *
 * Functional description
 *	Report (print) the status and configuration
 *  of all installed Firebird services.
 *  If none are installed return FB_FAILURE
 *  so as to allow a call to svc_query for the
 *  status of the default instance.
 *
 **********************************************/
	if (manager == NULL)
		return FB_FAILURE;

	DWORD lpServicesReturned = 0;
	DWORD lpResumeHandle = 0;
	DWORD pcbBytesNeeded = 0;
	USHORT rc = FB_FAILURE;

	EnumServicesStatus(manager, SERVICE_WIN32, SERVICE_STATE_ALL, NULL, 0,
		&pcbBytesNeeded, &lpServicesReturned, &lpResumeHandle);

    if ( GetLastError() == ERROR_MORE_DATA )
	{
		const DWORD dwBytes = pcbBytesNeeded + sizeof(ENUM_SERVICE_STATUS);
		ENUM_SERVICE_STATUS* service_data = FB_NEW ENUM_SERVICE_STATUS [dwBytes];
		EnumServicesStatus(manager, SERVICE_WIN32, SERVICE_STATE_ALL, service_data, dwBytes,
			&pcbBytesNeeded, &lpServicesReturned, &lpResumeHandle);

		if (lpServicesReturned == 0)
			delete[] service_data;
		else
		{
			Firebird::string serverServiceName;
			bool firebirdServicesInstalled = false;

			for ( DWORD i = 0; i < lpServicesReturned; i++ )
			{
				serverServiceName = service_data[i].lpServiceName;
				if ( serverServiceName.substr(0, 8) == "Firebird" )
				{
					svc_query(service_data[i].lpServiceName, service_data[i].lpDisplayName, manager);

					firebirdServicesInstalled = true;
				}
			}

			delete[] service_data;

			if ( firebirdServicesInstalled )
				rc = FB_SUCCESS;
			else
				printf("\nNo named Firebird service instances are installed.\n");
		}
	}

	return rc;
}