Archive for the ‘Delphi’ Category
Posted by jpluimers on 2013/05/21
One of the things you must be careful with is reentrancy in your application through a message loop.
The most obvious way is Application.ProcessMessages: it will loop until all messages from the Windows message queue are processed, whether your application is ready for them or not.
A less obvious way is because of modal dialogs or forms. They have their own message loop which might cause global reentrancy in your application (for instance through TTimer objects).
That was the case for this problem: stack overflow with repeated DispatchMessageW in the call stack.
A couple of ways to try to avoid these issues:
- Don’t cause a secondary message loop.
You can refrain from calling Application.ProcessMessages, but you cannot always avoid modal dialogs.
- Protect each of your event handlers by disabling the path to it as soon as it gets called.
This means disabling the Enabled property for instances of TTimer, TControl, TAction, or other objects that cause events.
–jeroen
via: windows – stack overflow with repeated DispatchMessageW in the call stack – Stack Overflow.
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Posted in Delphi, Development, Software Development | 2 Comments »
Posted by jpluimers on 2013/05/15
It is unwise to pass objects allocated in one framework over a DLL boundary to a different framework.
In the case of Using C dll in delphi return nothing, someone tries to pass an Interface to some memory in the C side over to Delphi.
Unless that interface is COM based, don’t do that!
In a more general way: don’t pass memory allocated on the DLL side over to the client side, no matter what kind of client you have.
From the DLL, either pass simple types, or fill buffers allocated at the client side.
–jeroen
via: Using C dll in delphi return nothing – Stack Overflow.
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Posted in Delphi, Delphi 1, Delphi 2005, Delphi 2006, Delphi 2007, Delphi 2009, Delphi 2010, Delphi 3, Delphi 4, Delphi 5, Delphi 6, Delphi 7, Delphi 8, Delphi x64, Delphi XE, Delphi XE2, Delphi XE3, Development, Software Development | 5 Comments »
Posted by jpluimers on 2013/05/14
I had some notes on Delphi WSDL and SOAP peculiarities somewhere, but I misplaced them.
Luckily, I found some links that explain most of my notes well:
–jeroen
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Posted in Delphi, Delphi 2007, Delphi 2009, Delphi 2010, Delphi XE, Delphi XE2, Delphi XE3, Development, SOAP/WebServices, Software Development | Leave a Comment »
Posted by jpluimers on 2013/05/09
Posted in .NET, C++, Cloud Development, COBOL, CommandLine, Delphi, Development, Fortran, iSeries, Java, Pascal, RegEx, Scripting, Software Development, Web Development, xCode/Mac/iPad/iPhone/iOS/cocoa | 3 Comments »
Posted by jpluimers on 2013/05/08
Lucida Console Sample (thanks Wikimedia!)
I’m in search to see if there is a better programmers font than the monospaced Lucida Console mainly to be used in Visual Studio, Delphi, the Windows console, Xcode and Eclipse.
What I love about Lucida Console design is the relatively large x-height combined with a small leading (often called “line height”).
This combines very readable text, and a lot of code lines in view.
Lucida has two small drawbacks, see the second image at the right:
- The captial O and digit 0 (zero) are very similar.
- Some uppercase/lowercase character pairs are alike (because of the large x-height)
But, since the font hasn’t been updated for a very long time, lots of Unicode code points that are now in current fonts, are missing from Lucida Console (unless you buy the most recent version that has 666 characters from Fonts.com)
Well, there are dozens of monospaced fonts around, so I wonder: which ones do you like?
In the mean while, I’m going to do some experimenting with fonts mentioned in these lists:
A few fonts I’m considering (I only want scalable fonts, so .fon files are out):
I have tried Adobe Source Code Pro about half a year ago. That didn’t cut it: problem with italics in Delphi, and note enough lines per screen.
New Open Source monospaced font from Adobe: Source Code Pro « The Wiert Corner – irregular stream of stuff.
–jeroen
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Posted in .NET, Apple, Delphi, Delphi 2007, Delphi XE3, Development, Font, Mac, OS X, Power User, Programmers Font, Software Development, Typography, Visual Studio 11, Visual Studio 2005, Visual Studio 2008, Visual Studio 2010, Visual Studio and tools, Windows, Windows 7, Windows 8, Windows Server 2008 R2, Windows XP, xCode/Mac/iPad/iPhone/iOS/cocoa | 36 Comments »
