InSendMessage function (winuser.h)

Determines whether the current window procedure is processing a message that was sent from another thread (in the same process or a different process) by a call to the SendMessage function.

To obtain additional information about how the message was sent, use the InSendMessageEx function.

Syntax

BOOL InSendMessage();

Return value

Type: BOOL

If the window procedure is processing a message sent to it from another thread using the SendMessage function, the return value is nonzero.

If the window procedure is not processing a message sent to it from another thread using the SendMessage function, the return value is zero.

Requirements

See also

Conceptual

InSendMessageEx

Messages and Message Queues

Reference

SendMessage