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Running & Exporting Same Crystal Report

Posted on 2009-06-29
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Last Modified: 2013-11-15
Hi there,
I have a report which takes a parameter ScriptRef and return the result. I am using the code below to export that report as an HTML to a web page. Code works fine for running this report once. But I'd like to run the same report more than once (in a loop) and export the content to a stream and finally flush that combined stream in a Response.End function.
When I run the web application in a debug mode I found out that it would just run the report once and then give an error when it iterates through the loop the second time.

'Attempted to read or write protected memory. This is often an indication that other memory is corrupt.'

The reason I want to run multiple reports in one final stream is so that user can do a batch print.

Any help will be highly appreciated.

Regards,
Fawad.

protected override void OnPreRender(EventArgs e)
    {
        string Script_Reference = "241-002-002";
        string userName = ConfigurationManager.AppSettings["UserID"];
        string password = ConfigurationManager.AppSettings["Password"];
        string serverName = ConfigurationManager.AppSettings["ServerName"];
        string databaseName = ConfigurationManager.AppSettings["DatabaseName"];
        string reportName1 = "";
        // using System.IO
        MemoryStream oStream2 = new MemoryStream(); 
 
        Response.Clear();
        Response.Buffer = true;
        //Response.ContentType = "application/pdf";
        for (int i = 0; i < 2; i++)
        {
            Label1.Text += ": Hi ";
            if (Script_Reference != null)
            {
                //try
                //{
                    lblScriptRef.Text = Script_Reference;
                    Label1.Text = "";// "Script_Reference";
                    reportName1 = AccessScript.GetScriptType(Script_Reference).Trim() + ".rpt";
                    report.Load("Path\\" + reportName1);
                    report.FileName = "Path\\" + reportName1;
                    report.SetParameterValue("Script_Reference", Script_Reference.Trim());
                    report.SetDatabaseLogon(userName, password, serverName, databaseName);
                    //CrystalReportViewer1.ReportSource = report;
                    MemoryStream oStream ;
                    oStream = (MemoryStream)
        report.ExportToStream(
        CrystalDecisions.Shared.ExportFormatType.HTML40);
                    oStream.WriteTo(oStream2);
                    oStream.Close();
                    oStream.Dispose();
                    oStream = null;
                    Script_Reference = "241-002-003";
                    report.Close();
 
                //}
                //catch (Exception ex)
                //{
                //    Label1.Text = "Please select Script from the prescription screen. " + ex.Message + " Report Name: " + reportName1;
                //}
                //CrystalReportViewer1.ReportSource = report;
            }
        }
        Response.BinaryWrite(oStream.ToArray()); 
        Response.End();
    }

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Question by:OrionPMS
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3 Comments
 
LVL 8

Accepted Solution

by:
Bob Hoffman earned 2000 total points
ID: 24740185
crystal creates temp .rpt files that are alive on your web servers hard drive until you dispose of the report file. Try disposing of the report file after you close it. Then recreate it at the top of your loop.
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Author Comment

by:OrionPMS
ID: 24743469
Thank you for your reply.

I used the report.Dispose() method and now I am not getting the error!

But now I've got another problem the final stream (ostream2) displays both report on top of each other. Is there any way I could add a page break at the end of the loop so that the next report is displayed after the first one.


Regards,
0

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