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OpenCV v4 UDF


smbape
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  • 2 weeks later...

@smbape can you move developing your UDF to github ?
I think then we can start involving.

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Signature last update: 2023-04-24

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Signature beginning:
Please remember: "AutoIt"..... *  Wondering who uses AutoIt and what it can be used for ? * Forum Rules *
ADO.au3 UDF * POP3.au3 UDF * XML.au3 UDF * IE on Windows 11 * How to ask ChatGPT for AutoIt Codefor other useful stuff click the following button:

Spoiler

Any of my own code posted anywhere on the forum is available for use by others without any restriction of any kind. 

My contribution (my own projects): * Debenu Quick PDF Library - UDF * Debenu PDF Viewer SDK - UDF * Acrobat Reader - ActiveX Viewer * UDF for PDFCreator v1.x.x * XZip - UDF * AppCompatFlags UDF * CrowdinAPI UDF * _WinMergeCompare2Files() * _JavaExceptionAdd() * _IsBeta() * Writing DPI Awareness App - workaround * _AutoIt_RequiredVersion() * Chilkatsoft.au3 UDF * TeamViewer.au3 UDF * JavaManagement UDF * VIES over SOAP * WinSCP UDF * GHAPI UDF - modest begining - comunication with GitHub REST APIErrorLog.au3 UDF - A logging Library * Include Dependency Tree (Tool for analyzing script relations) * Show_Macro_Values.au3 *

 

My contribution to others projects or UDF based on  others projects: * _sql.au3 UDF  * POP3.au3 UDF *  RTF Printer - UDF * XML.au3 UDF * ADO.au3 UDF SMTP Mailer UDF * Dual Monitor resolution detection * * 2GUI on Dual Monitor System * _SciLexer.au3 UDF * SciTE - Lexer for console pane

Useful links: * Forum Rules * Forum etiquette *  Forum Information and FAQs * How to post code on the forum * AutoIt Online Documentation * AutoIt Online Beta Documentation * SciTE4AutoIt3 getting started * Convert text blocks to AutoIt code * Games made in Autoit * Programming related sites * Polish AutoIt Tutorial * DllCall Code Generator * 

Wiki: Expand your knowledge - AutoIt Wiki * Collection of User Defined Functions * How to use HelpFile * Good coding practices in AutoIt * 

OpenOffice/LibreOffice/XLS Related: WriterDemo.au3 * XLS/MDB from scratch with ADOX

IE Related:  * How to use IE.au3  UDF with  AutoIt v3.3.14.x * Why isn't Autoit able to click a Javascript Dialog? * Clicking javascript button with no ID * IE document >> save as MHT file * IETab Switcher (by LarsJ ) * HTML Entities * _IEquerySelectorAll() (by uncommon) * IE in TaskSchedulerIE Embedded Control Versioning (use IE9+ and HTML5 in a GUI) * PDF Related:How to get reference to PDF object embeded in IE * IE on Windows 11

I encourage you to read: * Global Vars * Best Coding Practices * Please explain code used in Help file for several File functions * OOP-like approach in AutoIt * UDF-Spec Questions *  EXAMPLE: How To Catch ConsoleWrite() output to a file or to CMD *

I also encourage you to check awesome @trancexx code:  * Create COM objects from modules without any demand on user to register anything. * Another COM object registering stuffOnHungApp handlerAvoid "AutoIt Error" message box in unknown errors  * HTML editor

winhttp.au3 related : * https://www.autoitscript.com/forum/topic/206771-winhttpau3-download-problem-youre-speaking-plain-http-to-an-ssl-enabled-server-port/

"Homo sum; humani nil a me alienum puto" - Publius Terentius Afer
"Program are meant to be read by humans and only incidentally for computers and execute" - Donald Knuth, "The Art of Computer Programming"
:naughty:  :ranting:, be  :) and       \\//_.

Anticipating Errors :  "Any program that accepts data from a user must include code to validate that data before sending it to the data store. You cannot rely on the data store, ...., or even your programming language to notify you of problems. You must check every byte entered by your users, making sure that data is the correct type for its field and that required fields are not empty."

Signature last update: 2023-04-24

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Hi @malcev

The environment variable is intended to override the embeded manifest.
It is not needed for scripting languages, but for compiled languages.
That being said, I kept it just in case.

For example, to use registration-free COM at compile time for opencv and mediapipe, the manifest used for activation context must have all the dependencies.
Since each of the libraries has its own manifest, environment varaibles are a way to reduce the complexity of specifying a manifest per library.

The following manisfest was put in a file
 

<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<assembly xmlns="urn:schemas-microsoft-com:asm.v1" manifestVersion="1.0">
    <assemblyIdentity type="win32" name="mediapipe.sxs" version="0.3.0.0" />

    <dependency>
        <dependentAssembly>
            <assemblyIdentity type="win32" name="autoit_opencv_com470.sxs" version="2.3.1.0" />
        </dependentAssembly>
    </dependency>

    <dependency>
        <dependentAssembly>
            <assemblyIdentity type="win32" name="autoit_mediapipe_com-0.9.1-470.sxs" version="0.3.0.0" />
        </dependentAssembly>
    </dependency>
</assembly>

and the environment variables point to that file, like in this c# example

https://github.com/smbape/node-autoit-mediapipe-com/blob/main/autoit-mediapipe-com/test/test.cs#L242

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Thank You for explanation.

Can We activate manifest only 1 time at start with DllActivateManifest, and deactivate it only before exit script with DllDeactivateActCtx?

Can be some memory leaks?

Also if We exit script without calling DllDeactivateActCtx, will be some memory leaks?

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I thought about it, but there are cases where the current activation context changes and that's because the activation contexts are per thread.
When a callback registered with DllCallbackRegister is called, the activation context changes.
Therefore, creating objects (in a c++ method or in autoit) will no longer work since the current activation context is not the one that contains the information about the COM objects.

There is also the case where different activation contexts are needed for different objects. For example if you use opencv and mediapipe at the same time.
To handle such a case, the manifest used for activation must have all dependencies, i.e. opencv and mediapipe.
But this is not enough, because the use in callbacks will not work.

From Microsoft about Isolating Components

Quote

Well-authored components do not perturb the environment of the hosting application, nor do they leak activation contexts. Well-authored components perform their own context management rather than relying on the hosting application's environment.

Activating before creating an object (_OpenCV_ObjCreate) or before calling a method/property (c++ GetTypeInfo/GetIDsOfNames/Invoke) ensures that the library objects always work.
Deactivating the context ensures that the library does not perturb the the environment of the hosting application.

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1 hour ago, malcev said:

Can be some memory leaks?

I don't understand the question.
What makes you think of memory leaks.

 

1 hour ago, malcev said:

Also if We exit script without calling DllDeactivateActCtx, will be some memory leaks?

No, when your script dies, the memory associated with your script dies too.
Perhaps you mean something else.

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