错误码

do {
    try await viewModel.join(with: token)
} catch let error as SRTCError {
    switch error {
    case .tokenExpired, .tokenInvalid:
        // 重新获取 Token
        break
    case .captureError(let message):
        print("采集失败:", message)
    default:
        print("SRTC error:", error.localizedDescription)
    }
} catch {
    print("Unknown error:", error.localizedDescription)
}