Thursday, August 14, 2008

Use Crystal Reports in Delphi ISAPI Web Application

Well obviously, you may have tried to use the VCL component, and cashed and burned repeatedly. I took my a long time to properly integrate Crystal reports with an Isapi application through delphi. After literally weeks of research in 2004 I was able to properly utilize almost all of Crystal's functionality inside an ISAPI.

Why am I just now writing about this? Well.. As time rolls on, the technology is still viable. Especially if you have a tone of Crystal reports you'd like your users to be able to download in .Doc or .PDF formats.

Here Goes...

Import the Crystal Reports type library, save it as CRAXDRT_TLB; (into new unit) This would apply to Crystal Reports version 9. Don't forget to add the "cr" in front of the object names!!!


Here's the source code example: Please forgive any poor formatting on my part I wrote an automated .Pas to HTML conversion program, in about ten minutes, and right now it's imperfect. So I will work on that program as I continue to post Delphi Tips. Thanks and enjoy.

PLEASE LEAVE ME A COMMENT IF YOU LIKE!


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procedure TWebModule1.WebModule1WaExportReportAction(Sender: TObject;
Request: TWebRequest; Response: TWebResponse; var Handled: Boolean);
var CrReport : Report;
NewStream : TStream;
TheReportType :CRExportFormatType;
S, TheCType : String;
begin
try


//For Initilization purposes only

TheReportType:= CRAXDRT_TLB.crEFTPortableDocFormat;

//End Initialization

////Use the value of a web page radio button to determine the type of export ////the users desires.

If TheButtonVal='PDF' then begin
TheReportType:= CRAXDRT_TLB.crEFTPortableDocFormat;
TheCType:='application/pdf'
end;
If TheButtonVal='DOC' then begin
TheReportType:= CRAXDRT_TLB.crEFTWordForWindows;
TheCType:='application/doc'
end;
If TheButtonVal='XLS' then begin
TheReportType:= CRAXDRT_TLB.crEFTExcel80;
TheCType:='application/xls'
end;
If TheButtonVal='RTF' then begin
TheReportType:= CRAXDRT_TLB.crEFTExactRichText;
TheCType:='application/rtf'
end;

///You could use the actual report name added to a select element using ///Delphi's ///FindFiles...
CrReport := Application1.OpenReport('DirectoryName\'+TheReportName);

CrReport.DiscardSavedData;
CrReport.EnableParameterPrompting:=False;
CrReport.DisplayProgressDialog:=False;
if TheButtonVal='PDF' then
CrReport.ExportOptions.PDFExportAllPages;

if CrReport.ParameterFields.Count=1 then
CrReport.ParameterFields.Item[1].AddCurrentValue(Code1);
////Depending upon any parameter values the Report uses and how they are //configured, these lines could change.
if CrReport.ParameterFields.Count=2 then begin
CrReport.ParameterFields.Item[1].AddCurrentValue(Code2);
CrReport.ParameterFields.Item[2].AddCurrentValue(Code3);
end;
CrReport.ExportOptions.FormatType :=TheReportType ;
CrReport.ExportOptions.DestinationType :=CRAXDRT_TLB.crEDTDiskFile;

/////Give the created report a destination on disk, and name
CrReport.ExportOptions.DiskFileName :=

CrReport.Export(False);

NewStream:=TFileStream.Create(the name you created above),
fmOpenRead and fmShareDenyWrite);
Response.ContentStream:=NewStream;
//IMPORTANT
Response.ContentType:=TheCType;
Response.SetCustomHeader('content-disposition', 'attachment; filename=YourShortFileName));
Except
Response.SendRedirect('Your Error Handling Page')
end;
end;
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