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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 InSendMessageEx(
LPVOID lpReserved
);
Parameters
lpReserved
Type: LPVOID
Reserved; must be NULL.
Return value
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 |
|---|---|
|
The message was sent using the SendMessageCallback function. The thread that sent the message is not blocked. |
|
The message was sent using the SendNotifyMessage function. The thread that sent the message is not blocked. |
|
The window procedure has processed the message. The thread that sent the message is no longer blocked. |
|
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
| Requirement | Value |
|---|---|
| Minimum supported client | Windows 2000 Professional [desktop apps only] |
| Minimum supported server | Windows 2000 Server [desktop apps only] |
| Target Platform | Windows |
| Header | winuser.h (include Windows.h) |
| Library | User32.lib |
| DLL | User32.dll |
| API set | ext-ms-win-ntuser-message-l1-1-0 (introduced in Windows 8) |
See also
Conceptual
Reference