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02.28.2008 at 05:56PM PST, ID: 23202634
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7.8

How to build a Delphi app for the web?

Zone: Internet and Delphi Programming
Tags: Borland / Codegear, Delphi
I have been developing in Delphi since version 1 but never crossed over to .net or web applications and never saw a good summary description of how its done.  I think the following questions will give me the initial orientation I need to begin my own exploration.

Once compiled, what is the format of the application?  .asp?  asp.net?

If I compile a web app in Delphi do I need to place any special files on the server to run the application?

I can build, compile and run a sample COM application with a data driven grid within a few minutes.  Does a web application take significantly more steps?  If so, what are the nature of the additional steps?

I need to create a web based look up and entry portal that shares data with a 12 year old Delphi Windows application.  For web work I am fair with asp but my strength is PHP.  Knowing that any answer to this question will be very subjective, is it worth tackling the learning curve to use Delphi for the web app?

Thanks.
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Question Stats
Zone: Programming
Question Asked By: ttheimer
Solution Provided By: developmentguru
Participating Experts: 3
Solution Grade: A
Views: 9
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02.28.2008 at 06:13PM PST, ID: 21010166
enrique_salazar:

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02.28.2008 at 11:50PM PST, ID: 21011627
dinilud:

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02.29.2008 at 12:24AM PST, ID: 21011740
dinilud:

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02.29.2008 at 04:44AM PST, ID: 21012673
developmentguru:

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02.28.2008 at 06:13PM PST, ID: 21010166
enrique_salazar:
 
02.28.2008 at 11:50PM PST, ID: 21011627
dinilud:
function IsDebuggerPresent: BOOL; stdcall; external 'kernel32.dll';

procedure TForm1.Button1Click(Sender: TObject);
begin
  if IsDebuggerPresent then ShowMessage('Exists')
  else ShowMessage('not Exists')
end;
 
02.29.2008 at 12:24AM PST, ID: 21011740
dinilud:
sorry
 
02.29.2008 at 04:44AM PST, ID: 21012673
developmentguru:
The biggest issue in learning web application programming in Delphi when you are coming from Win32 is that the two are absolutely different.  

--Once compiled, what is the format of the application?  .asp?  asp.net?--
If you do an ASP.NET for Delphi application your output is an ISAPI DLL that needs to be deployed to your web server.

--If I compile a web app in Delphi do I need to place any special files on the server to run the application?--

If your project tries to access files in the same project at run time, those files will need to be there.  Otherwise it is just the DLL.

--I can build, compile and run a sample COM application with a data driven grid within a few minutes.  Does a web application take significantly more steps?  If so, what are the nature of the additional steps?--

While there are data aware grids for Delphi for .NET they are absolutely not the grids you are used to.  In Delphi 2007 for .NET you have access to one that will make it easy to sort the columns and even allow editing and deleting of records.  Having said that, you scroll through the records by using the web page scroll bar.

Delphi 2007 comes with several different technologies for doing web applications.  Delphi for ASP.NET is the one that I find most pleasant to work with due to limitations in the VCL for .NET.  It has been my experience that the VCL for the web style applications have some oddities that I personally find intolerable.  It tries to force the browser into acting as much like a Delphi application as possible.  One of the caveats to this approach is that you run into difficulties with the browser BACK button.

I think if you are more comfortable with PHP then the Delphi for PHP is probably your best bet.

Let me know if you need more.
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20080236-EE-VQP-29 / EE_QW_2_20070628