InSendMessageEx function

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


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/valueDescription
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

Minimum supported client

Windows 2000 Professional [desktop apps only]

Minimum supported server

Windows 2000 Server [desktop apps only]

Header

Winuser.h (include Windows.h)

Library

User32.lib

DLL

User32.dll

See also

Reference
SendMessage
SendMessageCallback
SendMessageTimeout
SendNotifyMessage
Conceptual
Messages and Message Queues

 

 

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