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InSendMessageEx function

Applies to: desktop apps only

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

Syntax

Copy

DWORD WINAPI InSendMessageEx(
  __reserved  LPVOID lpReserved
);

Parameters

lpReserved

Type: LPVOID

Reserved; must be NULL.

Return value

Type:

Type: DWORD

If the message was not sent, the return value is ISMEX_NOSEND (0x00000000). Otherwise, the return value is one or more of the following values.

Return code/value	Description
ISMEX_CALLBACK 0x00000004	The message was sent using the SendMessageCallback function. The thread that sent the message is not blocked.
ISMEX_NOTIFY 0x00000002	The message was sent using the SendNotifyMessage function. The thread that sent the message is not blocked.
ISMEX_REPLIED 0x00000008	The window procedure has processed the message. The thread that sent the message is no longer blocked.
ISMEX_SEND 0x00000001	The message was sent using the SendMessage or SendMessageTimeout function. If ISMEX_REPLIED is not set, the thread that sent the message is blocked.

Remarks

To determine if the sender is blocked, use the following test:

fBlocked = ( InSendMessageEx(NULL) & (ISMEX_REPLIED|ISMEX_SEND) ) == ISMEX_SEND;

Requirements