ReportBuilder + cxGrid = Error: "canvas does not allow drawing"

Question

Is there a cxGrid and a ReportBuilder report, linked to the same DataSource. When I am printing the report, it show error: "canvas does not allow drawing".

This is my code to solve.

  Screen.Cursor := crHourGlass;
  cxGridModeloDBTableView1.DataController.DataSource := nil;
  try
    pprReportBuilder.Print;
  finally
    cxGridModeloDBTableView1.DataController.DataSource := dsModeloView;
    Screen.Cursor := crDefault;
  end;

Anyone can help me to solve this problem by another way? Thanks!

ah, got it. So report printing fails while datasource link remains in effect, right? — OnTheFly, Apr 04 '13 at 02:00
My guess is that ReportBuilder is navigating the dataset to create the report, but the cxGrid does not expect that. Try using `cxGrid.BeginUpdate` and `cxGrid.EndUpdate` before and after `pprReportBuilder.Print` — Guillem Vicens, Apr 04 '13 at 06:59
glad to hear that. I'll post it as an answer just in case someone has the same problem. Feel free to accept it if you want :P — Guillem Vicens, Apr 04 '13 at 13:17

score 5 · Accepted Answer · answered Apr 04 '13 at 13:19

My guess is that ReportBuilder is navigating the dataset to create the report, but the cxGrid does not expect that.

Instead of decoupling the datasource, try using cxGrid.BeginUpdate and cxGrid.EndUpdatebefore and after pprReportBuilder.Print like this:

  Screen.Cursor := crHourGlass;
  cxGridModeloDBTableView1.BeginUpdate;
  try
    pprReportBuilder.Print;
  finally
    cxGridModeloDBTableView1.EndUpdate;
    Screen.Cursor := crDefault;
  end;

HTH

ReportBuilder + cxGrid = Error: "canvas does not allow drawing"

1 Answers1