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Dave Novo

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Dave Novo last won the day on March 12 2021

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  1. Dave Novo

    TeeChart 11.3 to 12.1

    They did a bunch of work recently to autoscale fonts based on the DPI. There is are some new enums to control this TCanvasZoomText=(ztManual, ztNo, ztAuto); TCanvasZoomPen=(zpManual, zpNo, zpAuto);
  2. Dave Novo

    Docking Example

    Hello all, If you go to the Delphi help Docking (Delphi) - RAD Studio Code Examples (embarcadero.com) You see if refers to a "docking demo". The general help for the built is docking is woefully inadequate. If you go to RAD Studio Code Examples (embarcadero.com) You find that the code examples are supposed to be at Embarcadero Technologies · GitHub or GitHub - Embarcadero/RADStudio11Demos: Delphi and C++Builder Demos for Embarcadero RAD Studio version 11 I cannot find a docking demo in either location. Has this been removed from the demos? Or am I just going crazy and its really there. Searching the github for the work "dock" and also cloning the repo and searching for "dock" does not turn up any files
  3. Hello, Is there an example of how TPropertyChangedEventArgs and associated infrastructure is supposed to be used? I am hoping there is some magic somehow where I can get a notification that a property changed on a class, without having to modify the source of that class to throw an event. Not sure how this would be done, magic code hooks, VMT hijacking or some other craziness. But when I see some of the magic in Spring4D, I can believe that almost anything is possible 🙂
  4. I never meant to imply that it was unnecessary. In fact, I already applied your excellent code to my own code that was writing out CSV files from large 2D matrices of integers. I was just wondering if there was a wider variety of circumstances that I could also leverage this technique that I was not thinking of. In fact, I also have to write out large matrices of floating point values, so will try to modify the Delphi float conversion routines to work on array of char similar to what you proposed below. TBH though, I have not done much timing. I wonder if the overhead of writing the file to disk dwarfs the time it takes for the conversions.
  5. I am trying to understand when this stack based allocation can practically help, because it seems to me that for the most part, you usually are going to have to do something with this array of char, and inevitably transform it to a string which will do some heap allocation and copy the stack data. The one thing that pops to my head is if saving a large number of integers to a file (as strings of course), when you can write to the file directly from the char buffer allocated on the stack. Then you avoid any heap allocation for a large number of conversions. Are there many other circumstances where you can avoid the eventual conversion to a heap allocated string and reap the benefits of the stack based memory allocation? It seems limited to areas where you are doing large numbers of IntToStr and only need to keep the string value within the local method within the loop.
  6. Dave Novo

    Intel Simd-sort library

    Correct, we sort arrays of integers and floats all the time. Both double and single. And have to process these millions of values as well. By "process" I mean perform mathematical operations on them. For us the Dew Research library mtxVec has proven invaluable.
  7. Dave Novo

    Intel Simd-sort library

    We write software that does scientific data analysis. We regularly have to sort arrays of millions of elements of data. But I recognize we are in the minority of developers.
  8. If all threads are fully utilizing the CPU you will more than likely cause slowdowns. The CPU will force one thread to stop, have to push its stack and pop the stack of the new thread, etc etc. As indicated above, for any process where each thread is waiting a lot (not just IO but really anything) you can happily create as many threads as you like (within reason).
  9. Dave Novo

    How to remember tests in VCL GUI Logger

    I figured it out. You have to close the TestRunner Gui properly. Since my test was failing (i.e. crashing) the GuiRunner never closed properly because I stopped running the program after the crash. I had expected that the Guirunner would save the selected tests prior to the test run started.
  10. Dave Novo

    TestInsight dissapeared

    Hello, Does anyone have any idea why my TestInsight could have dissapeared. I do not see it in the View menu, nor can I right click on a project and make it a "test insight" application (ie it just adds the TESTINSIGHT compiler directive". I have uninstalled/reinstalled testinsight 3x already. I am using version that I just installed.
  11. I am a newbie to DunitX so this may be a dumb question. If I select some tests to run in the VCL GUI logger, they run fine. When I recompile my app, all the tests are selected again, even though previously I only selected one. Is there a way to have the VCL GUI logger remember my previous selections so I dont have to keep selecting the same things?
  12. Dave Novo

    Coming soon

    Instead of just using SQL strings, did you think of using some of the existing ORM syntax as a model. There are many examples for Delphi. See TMS Aurelius or Spring4D for examples.
  13. Dave Novo

    Anyone know why?

    I agree with Darian. We have hired many good Devs in the past with and without Delphi experience. Of course the good Devs with no Delphi experience are already good Devs by any definition i.e. smart, know OOP well, diligent workers. But lets face it, the RTL/VCL is 10s or maybe 100s of thousands of lines of code. You cannot expect a Delphi noob to not take a while to learn even what classes are available and what the methods are. Never mind all the Delphi-isms how to most effectively use them. Never mind how to work around all the bugs in the IDE and all the tricks of the Delphi debugger. Never mind the subtleties of Delphi reference counting that can be different from other libraries. etc. etc. IME it takes at least a few years before a good developer becomes a true good Delphi Developer.
  14. ugh. sorry, I was in the middle of creating a whole bunch of templates for different greek letters and was copying and pasting. Just change the \alpha to \sigma. Or replace the sigma symbol inside the CDATA and Description with an alpha. The other thing I found is that the template above will not insert the symbol into a comment. if you change the context to "comments" then it does, although seems to sometimes put it in the wrong spot when inside the comments. It seems to work fine in the method body. Also, inside the comment it is intermittent if it works automatically or you have to press CTRL+J or Ctrl+Space after entering the template name. Below is the alpha template <?xml version="1.0" encoding="utf-8" ?> <codetemplate xmlns="http://schemas.borland.com/Delphi/2005/codetemplates" version="1.0.0"> <template name="\alpha" invoke="auto"> <description> inserts the α symbol based on the latex syntax </description> <author> David Novo-Lake </author> <code language="Delphi" context="comment"><![CDATA[α]]> </code> </template> </codetemplate>
  15. Dave Novo

    restricting floating point range

    Thanks for the suggestions. I was looking for compiler support instead of rolling my own, but all the suggestions above are great.