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Replace vague instructions for Mono with precise ones #1633

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Replace vague instructions for Mono with precise ones #1633

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23 changes: 18 additions & 5 deletions docs/CrossPlatform.md
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Expand Up @@ -46,8 +46,21 @@ by adding one of the following properties your `.csproj` file:

### Mono

Getting Magick.NET working on Mono sometimes requires an extra step. The Magick.NET.Native library is not always automatically copied
to the output directory when the NuGet reference is added to the project. The copy does not happens when the project is build on Windows
instead of a Linux machine. The native library located in the folder `runtimes/linux-x64/native` of the NuGet package should then be
copied to the output folder of the project. And it is possible that you will need to rename the native library and prefix it with
`lib` (e.g `libMagick.NET-Q8-x64.Native.dll.so`).
Getting Magick.NET working for legacy Framework targets under Mono requires an extra step.
As part of the NuGet restore for the relevant Magick.NET package, native libraries from are automatically copied to the project output,
but when you have a `net4*` target the SDK assumes that Windows native libraries are desired. On a Windows host, this isn't a problem.
The solution is to copy the correct library from the `runtimes` dir of the NuGet package, and optionally delete the incorrect versions,
by adding something like this to the `.csproj`:
```xml
<ItemGroup>
<PackageReference Include="Magick.NET-Q8-AnyCPU" GeneratePathProperty="true" /> <!-- add `GeneratePathProperty` so `$(PkgMagick_NET-Q8-AnyCPU)` is usable -->
</ItemGroup>
<Target Name="PostBuild" AfterTargets="PostBuildEvent" Condition=" '$(OS)' != 'WINDOWS_NT' ">
<ItemGroup>
<ToDelete Include="$(OutputPath)Magick.Native-*.dll" />
<ToCopy Include="$(PkgMagick_NET-Q8-AnyCPU)/runtimes/linux-x64/native/*.dll.so" /> <!-- change `linux-x64` to match host -->
</ItemGroup>
<Delete Files="@(ToDelete)" />
<Copy SourceFiles="@(ToCopy)" DestinationFiles="@(ToCopy->'$(OutputPath)lib%(Filename)%(Extension)')" /> <!-- without a DllMap, Mono looks for e.g. `libmagick.dll.so` when a `[DllImport("magick.dll")]` is used, so this transforms the filename to the expected format -->
</Target>
```