Notifies the application program of the length of the pre-editing space.
The IMTextStart subroutine is called by the input method when the pre-editing is started, but prior to calling the IMTextDraw callback subroutine. This subroutine notifies the input method of the length, in terms of bytes, of pre-editing space. It sets the length of the available space (>=0) on the display to the integer pointed to by the Space parameter. A value of -1 indicates that the pre-editing space is dynamic and has no limit.
This subroutine is provided by applications that use input methods.
| Item | Description |
|---|---|
| IM | Indicates the input method instance. |
| Space | Maximum length of pre-editing string. |
| UData | An argument passed by the IMCreate subroutine. |