[This is preliminary documentation and subject to change.]
The 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). This function is similar to the InSendMessage function, but provides additional information about how the message was sent.
DWORD InSendMessageEx(
LPVOID lpReserved // must be NULL
);
If the message was not sent, the return value is ISMEX_NOSEND. Otherwise, the return value is one or more of the following values.
| Value | Meaning |
|---|---|
| ISMEX_CALLBACK | The message was sent using the SendMessageCallback function. The thread that sent the message is not blocked. |
| ISMEX_NOTIFY | The message was sent using the SendNotifyMessage function. The thread that sent the message is not blocked. |
| ISMEX_REPLIED | The window procedure has processed the message. The thread that sent the message is no longer blocked. |
| ISMEX_SEND | The message was sent using the SendMessage or SendMessageTimeout function. If ISMEX_REPLIED is not set, the thread that sent the message is blocked. |
Windows NT: Requires version 5.0 or later.
Windows: Requires Windows 98.
Windows CE: Unsupported.
Header: Declared in winuser.h.
Import Library: Use user32.lib.
Messages and Message Queues Overview, Message and Message Queue Functions, SendMessage, SendMessageCallback, SendMessageTimeout, SendNotifyMessage