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<!-- Enter a brief description/summary of your PR here. What does it fix/what does it change/how was it tested (even manually, if necessary)? --> ## Summary of the Pull Request SettingsUtils is initialized multiple times over the whole solution. This creates one singeltone instance (with the default settings), so it only has to be initialized once (and improve performance a bit with that) <!-- Please review the items on the PR checklist before submitting--> ## PR Checklist - [ ] Closes: #xxx <!-- - [ ] Closes: #yyy (add separate lines for additional resolved issues) --> - [ ] **Communication:** I've discussed this with core contributors already. If the work hasn't been agreed, this work might be rejected - [ ] **Tests:** Added/updated and all pass - [ ] **Localization:** All end-user-facing strings can be localized - [ ] **Dev docs:** Added/updated - [ ] **New binaries:** Added on the required places - [ ] [JSON for signing](https://github.com/microsoft/PowerToys/blob/main/.pipelines/ESRPSigning_core.json) for new binaries - [ ] [WXS for installer](https://github.com/microsoft/PowerToys/blob/main/installer/PowerToysSetup/Product.wxs) for new binaries and localization folder - [ ] [YML for CI pipeline](https://github.com/microsoft/PowerToys/blob/main/.pipelines/ci/templates/build-powertoys-steps.yml) for new test projects - [ ] [YML for signed pipeline](https://github.com/microsoft/PowerToys/blob/main/.pipelines/release.yml) - [ ] **Documentation updated:** If checked, please file a pull request on [our docs repo](https://github.com/MicrosoftDocs/windows-uwp/tree/docs/hub/powertoys) and link it here: #xxx <!-- Provide a more detailed description of the PR, other things fixed, or any additional comments/features here --> ## Detailed Description of the Pull Request / Additional comments <!-- Describe how you validated the behavior. Add automated tests wherever possible, but list manual validation steps taken as well --> ## Validation Steps Performed
File Explorer
End user facing:
Developing
- Add new C++ DLL project in the preview pane folder. This DLL is actual preview handler, i.e. implements IPreviewHandler/IThumbnailProvider interface.
- Add new .NET EXE project in the preview pane folder. This EXE is being spawned by C++ DLL to generate preview/thumbnail.
Installation
MSI (Recommended)
To add a new Previewer update the Product.wxs file in PowerToysSetup similar to existing Previewer to register the Preview Handler. More details about registration of Preview Handlers can be found here. - implemented in modulesRegistry.h.
Directly registering/unregistering DLL's
[Important] This method of registering Preview Handler DLL's is not recommended. It could lead to registry corruption.
Registering Preview Handler
- Restart Visual studio as administrator.
- Sign
XYZPreviewHandlerand its dependencies. To sign an assembly in VS, follow steps given Create and sign an assembly with a strong name by using Visual Studio. - Build
XYZPreviewHandlerproject. - Open developer command prompt from
Tools > Command Line > Developer Command Prompt. - Run following command for each nuget and project dependency to add them to Global Assembly Cache(GAC).
gacutil -i <path to dependency>
- Run following commands to register preview handler.
cd C:\Windows\Microsoft.NET\Framework64\4.0.x.x
gacutil -i <path to XYZPreviewHandler.dll>
RegAsm.exe /codebase <path to XYZPreviewHandler.dll>
- Restart Windows Explorer process.
Unregistering Preview Handler
- Run following commands in elevated developer command prompt to unregister preview handler.
cd C:\Windows\Microsoft.NET\Framework64\4.0.x.x
RegAsm.exe /unregister <path to XYZPreviewHandler.dll>
gacutil -u XYZPreviewHandler
Debugging
Since in-process preview handlers run under a surrogate hosting process (prevhost.exe by default), to debug a preview handler, you need to attach the debugger to the host process.
- Click on a file with registered extension to start host process.
- Attach debugger in Visual studio from
Debug->Attach to Processand selectprevhost.exewith typeManaged(version), x64.
Managing Preview Handlers
After successful integration, your preview handler should appear in the PowerToys settings UI under the File Explorer Preview Tab. In here you should be able to enable and disable all the preview handles.
