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函数返回值。如果这个函数是执行完返回的话将包含就有实际意义的数据，如果立即返回则包含状态信息--发送成功与否，并不能说明执行的如何。HRESULT A value returned from a function call to an interface, consisting of a severity code, context information, a facility code, and a status code that describes the result。 For 16-bit Windows systems, the HRESULT is an opaque result handle defined to be zero for a successful return from a function, and nonzero if error or status information is to be returned。 To convert an HRESULT into a more detailed SCODE (or return value), applications call GetSCode()。 See SCODE。 。