Intermec Trakker T2090, User Manual

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im_tm_callback_register
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fDisable Specifies whether the callback is enabled or disabled if the
application does not control the screen. Use this constant only:
IM_FALSE Enable callback whether or not the application controls the
screen.
OUT Parameters
index Index number for the function in the timer callback database.
Return Value
This function returns one of these codes:
IM_SUCCESS Success.
IM_TMCALLBK_TABLE_FULL Timer callback database table is full.
IM_INVALID_TMCALLBK_PERIOD The period value is out of range.
IM_INVALID_TMCALLBK_REPETITION The repeat_count value is out
of range.
Notes You must specify the index value when you use im_tm_callback_cancel to
remove the function from the timer callback database.
Because the T2090 is a DOS unitasking environment, the application always
controls the screen. The application does not release control of the screen
until all the callbacks have been completed or until the user terminates the
function call by entering Q to quit the loop. Therefore, you set the fDisable
parameter to IM_FALSE.
See Also im_tm_callback_cancel