Report Builder fetches data and formats blocks of the report. When the formatted blocks cross a page boundary, a page header/footer block set is inserted in the flow and the page is sent to the printer or displayed in preview mode. The report sends SAM_ReportNotify messages as the report blocks are formatted and output into the page buffer. The Before notifications are send before any formatting occurs, the Output notifications are sent when the first line of the report is output and the Done notifications are sent when the entire block is output. Notifications are sent to a top-level window or MDI window that starts the report. Report Builder sends two sets of notifications for each block: When at least one line of the formatted block is output | When the block is finished outputting Check the lParam variable to see which part of the report Report Builder is ready to format. The lParam is one of the RPT_Before* constants in the table below. Report Builder ignores any va

public const int SAM_ReportNotify