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Jeroen W. Pluimers on .NET, C#, Delphi, databases, and personal interests

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Archive for the ‘Windows Development’ Category

A COM Object Collection (IEnumVARIANT) – Delphi Tips – CJC Delphi (Cool Delphi Tips)

Posted by jpluimers on 2019/07/04

Summary of [WayBack] A COM Object Collection (IEnumVARIANT) – Delphi Tips – CJC Delphi (Cool Delphi Tips)

Question: How to implements object collection that support Visual Basic’s For Each construct ?

In order to implements an object collection your object has to return  IEnumVariant pointer from a special property named _NewEnum.

Via: [WayBack] What interface to I need to implement to allow ForEach in VBA on a COM object written in delphi? – Stack Overflow


Posted in COM/DCOM/COM+, Delphi, Development, Software Development, Windows Development | Leave a Comment »

Detecting if a debugger is present is different from detecting if an IDE is present.

Posted by jpluimers on 2019/04/04

I have seen this happen in various environments: people wanting to detect if their debugger is present, but trying to detect their IDE, or vice versa.

Similar reasoning is for detecting for being running on a console, or your project having been built to run on a console.

People use these decisions, for instance to determine if their application should behave as a service, or as a regular process.

Ways to determine the various permutation points:

  • Running inside a debugger: use the [WayBackIsDebuggerPresent function (which can be true, even if Delphi DebugHook stays zero).
  • Check for the IDE: tricky; as IDEs have different behaviour over time. For Delphi, check for any TAppBuilder Window class with the [WayBack] FindWindow function.
  • Compiled for console: for Delphi check IsConsole, for .NET I could not find good information.
  • Running on a console: check if you can allocate a handle to stdout
  • Running as a service: check the hosting assembly or hosting process

Related links:


Posted in .NET, Delphi, Development, Software Development, Windows Development | Leave a Comment »

sorting – Is there a Windows equivalent to the Unix uniq? – Super User

Posted by jpluimers on 2019/03/08


  • Windows 10 has an undocumented /unique switch for sort
  • git for Windows ships with uniq (in a default x64 install, it is at C:\Program Files\Git\usr\bin\uniq.exe)

From [WayBack] sorting – Is there a Windows equivalent to the Unix uniq? – Super User

This works fine:

dir /s /b *0*.pas *1*.pas *2*.pas *3*.pas *4*.pas *5*.pas *6*.pas *7*.pas*8*.pas *9*.pas | sort /unique > pas-files-with-numeric-names.txt

I need remove duplicate lines from a text file, it is simple in Linux usingcat file.txt |sort | uniqwhen file.txt containsaaabbbaaacccIt will output aaabbbcccIs there a Windows


Posted in Development, Power User, Software Development, Windows, Windows Development | Leave a Comment »

Breaking in the Delphi debugger without a breakpoint

Posted by jpluimers on 2019/02/20

You can fire a debugger breakpoint using either of these two:

  • asm int 3 end which is the x86 debug interrupt
  • DebugBreak() which is the Windows API function wrapping the above interrupt

I’m not sure how accurate it is (in the past it would fail under some debuggers other than the Delphi IDE), but as of Delphi 2, there is a DebugHook variable that is non-zero when running under the Delphi debugger, so you can protect your code.

Via [WayBackI remember some time ago, Jeroen Pluijmers posted a snippet of how to place a breakpoint directly in the Delphi source without relying on the F5 key. – Alberto Paganini – Google+



Posted in Delphi, Development, Software Development, Windows Development | Leave a Comment »

A 90-byte “whereis” program – The Old New Thing

Posted by jpluimers on 2018/11/23

I needed a “get only the first result” of WHERE (which is present after Windows 2000, so XP, Server 2003 and up), so based on [WayBackA 90-byte “whereis” program – The Old New Thing I came up with this:

@echo off
:: based on
::for %%f in (%1) do @echo.%%~$PATH:f
for %%e in (%PATHEXT%) do @for %%i in (%1 %~n1%%e) do (
  @if NOT "%%~$PATH:i"=="" (
    echo %%~$PATH:i
    goto :eof
:: note: WHERE lists all occurrences of a file on the PATH in PATH order
goto :eof

Two changes:

  • it takes into account the extension if you specify it (unlike WHERE.EXE)
  • it bails out at the first match (like WHERE.EXE)



Posted in Batch-Files, Development, Power User, Scripting, Software Development, The Old New Thing, Windows, Windows Development | Leave a Comment »

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