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Add debugging section in preview pane (#6717)

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* Added info on directly registering dll

* Update README.md

* Update README.md

* Update to regasm x64

* Add information related to assembly signing in readme preview pane handler

* Bold warning for taking registry route for installation
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Divyansh Srivastava 2020-09-29 14:36:28 -07:00 committed by GitHub
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src/modules/previewpane/README.md
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@ -83,7 +83,7 @@ FileExplorerPreviewSettings(
## Installation
### MSI
### 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.](https://docs.microsoft.com/en-us/windows/win32/shell/how-to-register-a-preview-handler)
@ -123,6 +123,38 @@ To add a new Previewer update the `Product.wxs` file in `PowerToysSetup` similar
</Component>
```
### 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
1. Restart Visual studio as administrator.
2. Sign `XYZPreviewHandler` and it's dependencies. To sign an assembly in VS, follow steps given [here](https://docs.microsoft.com/en-us/dotnet/standard/assembly/sign-strong-name#create-and-sign-an-assembly-with-a-strong-name-by-using-visual-studio).
3. Build `XYZPreviewHandler` project.
4. Open developer command prompt from `Tools > Command Line > Developer Command Prompt`.
5. Run following command for each nuget and project dependency to add them to Global Assembly Cache(GAC).
```
gacutil -i <path to dependency>
```
6. 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>
```
7. Restart Windows Explorer process.
#### Unregistering Preview Handler
1. 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.
1. Click on a file with registered extension to start host process.
2. Attach debugger in Visual studio from `Debug->Attach to Process` and select `prevhost.exe` with type `Managed(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 your preview handler.