DTWAIN_IsTwainMsg

The DTWAIN_IsTwainMsg function is called to determine whether a message is a TWAIN message.

DTWAIN_BOOL DTWAIN_IsTwainMsg ( LPMSG lpmsg );

Parameters

lpmsg

Points to a MSG structure that receives message information from the thread's message queue.

Return Values

If the function returns, TRUE, the message is a TWAIN related message. If the function returns FALSE, the message is a normal Window's message.

Comments

The DTWAIN_IsTwainMsg function must be called by an application that uses modeless TWAIN processing. The call to DTWAIN_IsTwainMsg should be made before the Windows API functions TranslateMessage and DispatchMessage. If DTWAIN_IsTwainMsg returns TRUE, the message is a TWAIN message and should not be processed by the application.

If the application uses modal TWAIN processing, the call to DTWAIN_IsTwainMsg is not necessary, and will cause undefined behavior if called by the application.

TWAIN State Transitions

None

Prerequisite Calls

None.

Optional Prerequisite Calls

None.