To enable report parameter printing in List & Label set the option LL_OPTION_REPORT_PARAMETERS_REALDATAJOBPARAMETER to a value unequal to 0.
Please note that this option has to be set for each LL-job that should support report parameter printing:
// activate report
parameter pane for current LL-Job
::LlSetOption(hJob,
LL_OPTION_REPORT_PARAMETERS_REALDATAJOBPARAMETER,
(LPARAM)&oMyReportParameters);
To deactivate report parameter printing for this LL-job set the option to NULL:
// deactivate
report parameter pane for current LL-Job
::LlSetOption(hJob,
LL_OPTION_REPORT_PARAMETERS_REALDATAJOBPARAMETER, NULL);
The parameter passed with this option can be used freely, for example as a pointer to an internal data structure or objects. This parameter will be passed unchanged in the callback for your use (scLlDrillDownJob._nUserParam). Please make sure the parameter is not 0 or NULL unless you want to deactivate report parameter printing.
Via the callback LL_NTFY_VIEWERDRILLDOWN (for further description, please see chapter Drilldown Reports in Preview) List & Label informs about the current task. This callback will always be called in the context of the preview thread, regardless if initiated from designer or preview print.
When you use structure members, e.g. like _nUserParam, please ensure that the thread has evaluated or copied them before you pass control back to List & Label, as the structure will no longer be valid then – this is true for all Callbacks!