# Hydra **URL:** https://talk.remobjects.com/c/hydra/5.md [Latest](https://talk.remobjects.com/latest.md) · [Categories](https://talk.remobjects.com/categories.md) · [Tags](https://talk.remobjects.com/tags.md) --- ## [Hydra vNext: New features](https://talk.remobjects.com/t/hydra-vnext-new-features/23813)
**Author:** [@antonk](https://talk.remobjects.com/u/antonk)\ **Replies:** 12\ **Last updated:** [August 18, 2026, 2:37pm UTC](https://talk.remobjects.com/t/hydra-vnext-new-features/23813 "2026-08-18T14:37:38Z")
This topic will contain brief information about interesting new features, significant bugfixes and breaking changes in the next releases of Hydra. --- ## [Hydra licensing issue](https://talk.remobjects.com/t/hydra-licensing-issue/33778)
**Author:** [@ron.sanmartino](https://talk.remobjects.com/u/ron.sanmartino)\ **Replies:** 1\ **Last updated:** [August 11, 2026, 7:05am UTC](https://talk.remobjects.com/t/hydra-licensing-issue/33778 "2026-08-11T07:05:22Z")
Hi, We are using Hydra Version 6.6.0.1301 with a Delphi Host and a Visual Studio C# plugin. Our license expired 2 days ago and we now get a licensing error when trying to build the C# plugin. I thought that when you pai… --- ## [Handle bug in Hydra](https://talk.remobjects.com/t/handle-bug-in-hydra/33492)
**Author:** [@plillejo](https://talk.remobjects.com/u/plillejo)\ **Replies:** 2\ **Last updated:** [June 15, 2026, 9:33am UTC](https://talk.remobjects.com/t/handle-bug-in-hydra/33492 "2026-06-15T09:33:56Z")
I just upgraded from Delphi 12.3, RemObjects Hydra - 6.6.0.1325, RemObjects Remoting SDK - 10.0.0.1585 to Delphi 13.1, RemObjects Hydra - 6.6.0.1367, RemObjects Remoting SDK - 10.0.0.1621. I have a Remobject server usi… --- ## [License issue](https://talk.remobjects.com/t/license-issue/32979)
**Author:** [@fiplan](https://talk.remobjects.com/u/fiplan)\ **Replies:** 2\ **Last updated:** [February 17, 2026, 10:31am UTC](https://talk.remobjects.com/t/license-issue/32979 "2026-02-17T10:31:17Z")
"Hello everyone, Could someone help me with a license issue? Whenever I start my application, I get the error: “A valid license could not be granted for the type ‘RemObjects.Hydra.NonVisualPlugin’. Please contact the m… --- ## [OLE 80131015 when trying to unload the plugin](https://talk.remobjects.com/t/ole-80131015-when-trying-to-unload-the-plugin/32978)
**Author:** [@allen](https://talk.remobjects.com/u/allen)\ **Replies:** 1\ **Last updated:** [February 17, 2026, 10:19am UTC](https://talk.remobjects.com/t/ole-80131015-when-trying-to-unload-the-plugin/32978 "2026-02-17T10:19:07Z")
Delphi 11.3 Host, VB.net plugin (visual studio 2022), Current version of Hydra. When I unload the plugin, I get the OLE error 80131015. I’ve read the other 3 threads on this subject from 2013 and 2016. Is there any u… --- ## [Object synchronization method was called from an unsynchronized block of code](https://talk.remobjects.com/t/object-synchronization-method-was-called-from-an-unsynchronized-block-of-code/32970)
**Author:** [@allen](https://talk.remobjects.com/u/allen)\ **Replies:** 1\ **Last updated:** [February 16, 2026, 10:32am UTC](https://talk.remobjects.com/t/object-synchronization-method-was-called-from-an-unsynchronized-block-of-code/32970 "2026-02-16T10:32:53Z")
Delphi 11.3 VB.Net plugin module. The Host delphi application is not threaded. I am able to create load the module and create the visual plugin The dll is implementing a 3rd party .net visual assembly. It is all wor… --- ## [Multiple user interfaces active from a single hydra .net dll](https://talk.remobjects.com/t/multiple-user-interfaces-active-from-a-single-hydra-net-dll/32933)
**Author:** [@allen](https://talk.remobjects.com/u/allen)\ **Replies:** 1\ **Last updated:** [February 10, 2026, 9:20am UTC](https://talk.remobjects.com/t/multiple-user-interfaces-active-from-a-single-hydra-net-dll/32933 "2026-02-10T09:20:50Z")
Is it possible to have a single dll that has multiple pages that can be active at the same time in a Delphi application. All the panels would share the same global .net core but have different pages active on multiple … --- ## [Call back events from WPF .Net framework Visual basic plugin to Delphi host application](https://talk.remobjects.com/t/call-back-events-from-wpf-net-framework-visual-basic-plugin-to-delphi-host-application/32904)
**Author:** [@allen](https://talk.remobjects.com/u/allen)\ **Replies:** 11\ **Last updated:** [February 6, 2026, 8:27am UTC](https://talk.remobjects.com/t/call-back-events-from-wpf-net-framework-visual-basic-plugin-to-delphi-host-application/32904 "2026-02-06T08:27:38Z")
I have created the WPF VB.net plugin that is hosted by a Delphi 11.3 application. The plugin works, but I’m trying to establish callback events from vb.net to delphi. Here is my .net Interface Imports System.Runtime.I… --- ## [Installation problem/question Visual Studio 2022](https://talk.remobjects.com/t/installation-problem-question-visual-studio-2022/32905)
**Author:** [@allen](https://talk.remobjects.com/u/allen)\ **Replies:** 2\ **Last updated:** [February 5, 2026, 6:31pm UTC](https://talk.remobjects.com/t/installation-problem-question-visual-studio-2022/32905 "2026-02-05T18:31:51Z")
I have installed the latest stable Hydra. In visual studio 2022 I don’t have the option to “Import interface from Delphi Unit” I believe it should be under “Tools” \> Hydra \> Import… But Hydra doesn’t exist in that menu… --- ## [Using Hydra to interface my Delphi application with the Dragon Medical Speechkit .NET SDK](https://talk.remobjects.com/t/using-hydra-to-interface-my-delphi-application-with-the-dragon-medical-speechkit-net-sdk/32717)
**Author:** [@allen](https://talk.remobjects.com/u/allen)\ **Replies:** 1\ **Last updated:** [January 19, 2026, 11:19am UTC](https://talk.remobjects.com/t/using-hydra-to-interface-my-delphi-application-with-the-dragon-medical-speechkit-net-sdk/32717 "2026-01-19T11:19:34Z")
Hello. I currently use Dragon Medical SpeechKit COM interface for a medical speech recognition interface with my Delphi application. Microsoft has purchased the product (from Nuance) and has discontinued the COM version… --- ## [Hydra with RAD Studio 13](https://talk.remobjects.com/t/hydra-with-rad-studio-13/32474)
**Author:** [@Van\_Buggenhout\_Karin](https://talk.remobjects.com/u/Van_Buggenhout_Karin)\ **Replies:** 1\ **Last updated:** [November 25, 2025, 9:21am UTC](https://talk.remobjects.com/t/hydra-with-rad-studio-13/32474 "2025-11-25T09:21:54Z")
Hello, I want to upgrade from RAD Studio 11 to 13. Now I’m using the RemOjects\_\*D28 and Hydra\_\*D28 packages to make the bridge with .NET in my code. I see there’s also D29 packages but it seems it’s used for RAD Studi… --- ## [Error installing Hydra on Delphi Alexandria 11.3 - RemObjects Hydra - 6.7.0.1365](https://talk.remobjects.com/t/error-installing-hydra-on-delphi-alexandria-11-3-remobjects-hydra-6-7-0-1365/32311)
**Author:** [@e.maldonado](https://talk.remobjects.com/u/e.maldonado)\ **Replies:** 3\ **Last updated:** [October 22, 2025, 3:05pm UTC](https://talk.remobjects.com/t/error-installing-hydra-on-delphi-alexandria-11-3-remobjects-hydra-6-7-0-1365/32311 "2025-10-22T15:05:44Z")
I got this error in log after installing this version. It would be nice when the script .train is compatible for Delphi 11.3 too. --- ## [Silent Hydra Installation through cmd or powershell script commands](https://talk.remobjects.com/t/silent-hydra-installation-through-cmd-or-powershell-script-commands/32324)
**Author:** [@e.maldonado](https://talk.remobjects.com/u/e.maldonado)\ **Replies:** 3\ **Last updated:** [October 21, 2025, 11:38am UTC](https://talk.remobjects.com/t/silent-hydra-installation-through-cmd-or-powershell-script-commands/32324 "2025-10-21T11:38:52Z")
Is it possible to install Hydra with a powershell or cmd script command? where I specify everything I need, for example: /platforms= win64, win32 /ides=bds28, bds29, bds37, vs2022… etc. --- ## [NET 10 SUpport](https://talk.remobjects.com/t/net-10-support/32304)
**Author:** [@sebastian.may](https://talk.remobjects.com/u/sebastian.may)\ **Replies:** 1\ **Last updated:** [October 14, 2025, 3:04pm UTC](https://talk.remobjects.com/t/net-10-support/32304 "2025-10-14T15:04:09Z")
Hello, is embedding WPF plugins developed in NET (Core) 10 into a Delphi VCL host supported? Thanks, Sebastian --- ## [Compiling Hydra Visual Plugin Module Project, but error "lc.exe exited with code -1"](https://talk.remobjects.com/t/compiling-hydra-visual-plugin-module-project-but-error-lc-exe-exited-with-code-1/32300)
**Author:** [@Anderson\_Gregorio](https://talk.remobjects.com/u/Anderson_Gregorio)\ **Replies:** 7\ **Last updated:** [October 14, 2025, 12:13pm UTC](https://talk.remobjects.com/t/compiling-hydra-visual-plugin-module-project-but-error-lc-exe-exited-with-code-1/32300 "2025-10-14T12:13:26Z")
Hi I’m trying compile a Hydra Project, but often got the error in Visual Studio “Error “lc.exe exited with code -1”. Redownload the licences throgh Everwood, but the error persists. So I’ve checket the licence file “l… --- ## [.NET 8 or 9 Winforms host with Delphi (12)](https://talk.remobjects.com/t/net-8-or-9-winforms-host-with-delphi-12/32107)
**Author:** [@robhoney72](https://talk.remobjects.com/u/robhoney72)\ **Replies:** 3\ **Last updated:** [August 28, 2025, 12:43pm UTC](https://talk.remobjects.com/t/net-8-or-9-winforms-host-with-delphi-12/32107 "2025-08-28T12:43:53Z")
Hello, I am just trying to work out whether a C# (.NET 8 or 9) Winforms host can work with Delphi (12) plugins (some visual, some not). I see .NET Core host support is mentioned in 6.6, but as a work in progress. So I’… --- ## [Crashes after upgrading .NET framework version](https://talk.remobjects.com/t/crashes-after-upgrading-net-framework-version/31719)
**Author:** [@GijbelsConsulting](https://talk.remobjects.com/u/GijbelsConsulting)\ **Replies:** 2\ **Last updated:** [May 21, 2025, 9:42am UTC](https://talk.remobjects.com/t/crashes-after-upgrading-net-framework-version/31719 "2025-05-21T09:42:48Z")
Hi, We are maintaining a Delphi 2010 application, which uses Hydra for displaying screens that are implemented in .NET Framework. We were having some issues (slow response times and white screens) so we decided to upgra… --- ## [Delphi 12 Host + .NET Core 8 WPF Plugin Runtime Exception](https://talk.remobjects.com/t/delphi-12-host-net-core-8-wpf-plugin-runtime-exception/31505)
**Author:** [@Tobias\_Kocherscheidt](https://talk.remobjects.com/u/Tobias_Kocherscheidt)\ **Replies:** 1\ **Last updated:** [March 20, 2025, 10:28am UTC](https://talk.remobjects.com/t/delphi-12-host-net-core-8-wpf-plugin-runtime-exception/31505 "2025-03-20T10:28:23Z")
I’m working on a project integrating .NET Core 8 into a Delphi application. I encountered a problem with the System.Runtime.dll assembly. When I run my application, I receive the following error message: The file or ass… --- ## [Hydra capability query 64 vs 32 bit](https://talk.remobjects.com/t/hydra-capability-query-64-vs-32-bit/31366)
**Author:** [@mjtrainor](https://talk.remobjects.com/u/mjtrainor)\ **Replies:** 2\ **Last updated:** [February 5, 2025, 6:41pm UTC](https://talk.remobjects.com/t/hydra-capability-query-64-vs-32-bit/31366 "2025-02-05T18:41:36Z")
I’m pretty sure I know the answer, based on testing, but any previous post I found on the subject was a decade old. Is there any reasonable way to have one end of the chain, the plugin in this case, be 32bit and have th… --- ## [Visual Studio imported interface problems](https://talk.remobjects.com/t/visual-studio-imported-interface-problems/31359)
**Author:** [@mjtrainor](https://talk.remobjects.com/u/mjtrainor)\ **Replies:** 7\ **Last updated:** [February 5, 2025, 7:30am UTC](https://talk.remobjects.com/t/visual-studio-imported-interface-problems/31359 "2025-02-05T07:30:57Z")
As before: Registered Hydra 6.7.0.1345, Delphi 11, Visual Studio 2022 17.12.4 .NET8 with a test project created from the VS2022 wizard. Non visual plugin only I have imported a Delphi interface to VS2022 in a Framework… --- ## [Visual Studio import plugin](https://talk.remobjects.com/t/visual-studio-import-plugin/31351)
**Author:** [@mjtrainor](https://talk.remobjects.com/u/mjtrainor)\ **Replies:** 8\ **Last updated:** [February 11, 2026, 9:00am UTC](https://talk.remobjects.com/t/visual-studio-import-plugin/31351 "2026-02-11T09:00:53Z")
Registered Hydra 6.7.0.1345, Delphi 11, Visual Studio 2022 17.12.4 I’ve created a very simple non-visual plugin in Delphi (probably incorrectly), with just as single function that returns an int as a test. I’d like to i… --- ## [Need to install Hydra Build 6.2.101 build number 1237](https://talk.remobjects.com/t/need-to-install-hydra-build-6-2-101-build-number-1237/31287)
**Author:** [@hariram.balasubraman](https://talk.remobjects.com/u/hariram.balasubraman)\ **Replies:** 1\ **Last updated:** [January 13, 2025, 5:57am UTC](https://talk.remobjects.com/t/need-to-install-hydra-build-6-2-101-build-number-1237/31287 "2025-01-13T05:57:50Z")
I need to install a older version of Hydra Remobjects 6.2.101.1237. How will I be able to do it? --- ## [Hydra package does not install on XE11](https://talk.remobjects.com/t/hydra-package-does-not-install-on-xe11/30994)
**Author:** [@fvancrae](https://talk.remobjects.com/u/fvancrae)\ **Replies:** 2\ **Last updated:** [November 12, 2024, 10:53am UTC](https://talk.remobjects.com/t/hydra-package-does-not-install-on-xe11/30994 "2024-11-12T10:53:11Z")
We upgraded to hydra 6.6.0.1301 but on one VM the package does not install in delphi XE11 We get error below How can we fix this? FYI: We are installing XE12 side by side the XE11 (which is why we upgraded the h… --- ## [Is it possible to use Hydra .NET Core WinForm plugin in an MFC application?](https://talk.remobjects.com/t/is-it-possible-to-use-hydra-net-core-winform-plugin-in-an-mfc-application/30992)
**Author:** [@wuping1](https://talk.remobjects.com/u/wuping1)\ **Replies:** 1\ **Last updated:** [November 12, 2024, 7:13am UTC](https://talk.remobjects.com/t/is-it-possible-to-use-hydra-net-core-winform-plugin-in-an-mfc-application/30992 "2024-11-12T07:13:46Z")
I understand the underlying mechanism is COM-based. and wonder if it is possible to use a Hydra .NET Core WinForm plugin in an MFC application (assuming the MFC can consume those COM interfaces)? --- ## [Help! Delphi Host + .NET Core 8 (WinForms) Plugin](https://talk.remobjects.com/t/help-delphi-host-net-core-8-winforms-plugin/30981)
**Author:** [@wuping1](https://talk.remobjects.com/u/wuping1)\ **Replies:** 7\ **Last updated:** [November 11, 2024, 6:04am UTC](https://talk.remobjects.com/t/help-delphi-host-net-core-8-winforms-plugin/30981 "2024-11-11T06:04:14Z")
Can someone help me to point out where can I find a DEMO illustrating Delphi Host + .NET Core (WinForms) ? Thank you --- ## [Incorrect Package Reference in RemObjects Hydra Package Checker for Delphi 12](https://talk.remobjects.com/t/incorrect-package-reference-in-remobjects-hydra-package-checker-for-delphi-12/30822)
**Author:** [@thomas.meixner](https://talk.remobjects.com/u/thomas.meixner)\ **Replies:** 2\ **Last updated:** [September 20, 2024, 12:30pm UTC](https://talk.remobjects.com/t/incorrect-package-reference-in-remobjects-hydra-package-checker-for-delphi-12/30822 "2024-09-20T12:30:11Z")
Hello, I’m currently using RAD Studio 12, and each time I start my project, the RemObjects Hydra Package Checker displays a warning suggesting that DIRegEx\_D12.dcp should be replaced with DIRegEx\_D29.dcp (screenshot). H… --- ## [Unloading and reloading modules in ModuleManager](https://talk.remobjects.com/t/unloading-and-reloading-modules-in-modulemanager/29985)
**Author:** [@simona](https://talk.remobjects.com/u/simona)\ **Replies:** 6\ **Last updated:** [July 17, 2024, 10:32am UTC](https://talk.remobjects.com/t/unloading-and-reloading-modules-in-modulemanager/29985 "2024-07-17T10:32:41Z")
I need to unload a dll from the modulemanager to allow it to be updated, then reload the dll once the file has been updated. When I do this the module is re-loaded but it reloads the old version of the dll. Is this becau… --- ## [Missing IHYVisualPlugin Interface in Hydra v6.6.0.1335 for Delphi](https://talk.remobjects.com/t/missing-ihyvisualplugin-interface-in-hydra-v6-6-0-1335-for-delphi/29922)
**Author:** [@thomas.meixner](https://talk.remobjects.com/u/thomas.meixner)\ **Replies:** 1\ **Last updated:** [June 21, 2024, 10:50am UTC](https://talk.remobjects.com/t/missing-ihyvisualplugin-interface-in-hydra-v6-6-0-1335-for-delphi/29922 "2024-06-21T10:50:23Z")
Hi, We recently upgraded from Hydra v6.1.97.1215 to v6.6.0.1335 and noticed that the uHYIntf unit, which included the IHYVisualPlugin interface, is no longer present. Our application heavily relies on this interface, an… --- ## [Host and plugin should be compiled with Hydra\_VCL package](https://talk.remobjects.com/t/host-and-plugin-should-be-compiled-with-hydra-vcl-package/29724)
**Author:** [@eduardobamorim](https://talk.remobjects.com/u/eduardobamorim)\ **Replies:** 3\ **Last updated:** [May 3, 2024, 6:26am UTC](https://talk.remobjects.com/t/host-and-plugin-should-be-compiled-with-hydra-vcl-package/29724 "2024-05-03T06:26:24Z")
I’m trying to migrate a project from XE8 to Athens. Remobjects 8.3 to 10. I have already made all the code changes where there were build problems. However, when I run the system, and it loads the modules, (in the fir… --- ## [Error installing Hydra on Delphi Alexandria 11.3 - RemObjects Hydra - 6.6.0.1301](https://talk.remobjects.com/t/error-installing-hydra-on-delphi-alexandria-11-3-remobjects-hydra-6-6-0-1301/29617)
**Author:** [@Anderson\_Gregorio](https://talk.remobjects.com/u/Anderson_Gregorio)\ **Replies:** 5\ **Last updated:** [April 10, 2024, 8:11am UTC](https://talk.remobjects.com/t/error-installing-hydra-on-delphi-alexandria-11-3-remobjects-hydra-6-6-0-1301/29617 "2024-04-10T08:11:26Z")
Hi, We’ve got the error below while installing this Hydra version on this Delphi Version. There’s just Delphi 11.3 installed at the O.S. DataAbstract and Elements both works fine. Information: O.S: Windows 11 Delph… [Next page](https://talk.remobjects.com/c/hydra/5.md?page=1)