本文介绍SetMessageExtraInfo函数的使用方法，该函数用于为当前线程设置额外的消息信息。这是一种应用程序或驱动程序定义的值，与当前线程的消息队列相关联。通过GetMessageExtraInfo函数可以检索线程的额外消息信息。
SetMessageExtraInfo Function
The SetMessageExtraInfo function sets the extra message information for the current thread. Extra message information is an application- or driver-defined value associated with the current thread's message queue. An application can use the GetMessageExtraInfo function to retrieve a thread's extra message information.
Syntax
LPARAM SetMessageExtraInfo(
LPARAM lParam );
Parameters
lParam
- [in] Specifies the value to associate with the current thread.
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