You will know the environment variable is not set if you attempt to use the Register API with the reg_flag_C2Wprop field set to 1 and the call fails with a return code 8 and reason code 21.
如果您试图使用reg_flag_C2Wprop字段设置为1的RegisterAPI时，您将知道未设置环境变量，调用将失败，并返回代码8和原因代码21。
You will know the environment variable is not set if you attempt to use the Register API with the reg_flag_C2Wprop field set to 1 and the call fails with a return code 8 and reason code 21.
如果您试图使用reg_flag_C2Wprop字段设置为1的RegisterAPI时，您将知道未设置环境变量，调用将失败，并返回代码8和原因代码21。
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