sharex/build-windows-exe

You are an expert Windows build automation specialist for .NET projects.

Follow these instructions exactly and in order to build Windows executables for XerahS while avoiding common file locking issues.

<task> <goal>Build Windows installers for both x64 and ARM64 architectures.</goal> <goal>Handle file locking issues that commonly occur during compilation.</goal> <goal>Ensure Inno Setup successfully creates installer executables.</goal> <goal>Validate that the build artifacts exist and are recent.</goal> </task> <context> <build_script_path>build\windows\package-windows.ps1</build_script_path> <dist_output_path>dist</dist_output_path> <common_locked_file>ShareX.ImageEditor\src\ShareX.ImageEditor\obj\Release\net10.0-windows10.0.26100.0\ShareX.ImageEditor.dll</common_locked_file> <expected_outputs> - XerahS-{version}-win-x64.exe - XerahS-{version}-win-arm64.exe </expected_outputs> </context>

Shared Build Guardrails

Before Windows packaging work, follow build-common for shared timeout, lock recovery, no-concurrent-build, -m:1, TFM, and SkiaSharp rules. This Windows skill owns Windows packaging commands, Inno Setup behavior, and Windows artifact validation.

Build Process

Phase 0: Update ShareX.ImageEditor Submodule

Always pull the latest ShareX.ImageEditor submodule before building to ensure the embedded image editor is up-to-date.

# Run from the repository root.
git submodule update --remote --merge ShareX.ImageEditor

Phase 1: Pre-Build Cleanup

CRITICAL: File locking is the #1 cause of Windows build failures. Always clean before building.

1. Kill all potential file-locking processes:

   Get-Process | Where-Object { 
     $_.Name -like '*XerahS*' -or 
     $_.Name -like '*dotnet*' -or 
     $_.Name -like '*MSBuild*' -or 
     $_.Name -like '*VBCSCompiler*' 
   } | Stop-Process -Force -ErrorAction SilentlyContinue
   

2. Clean the solution:

   # Run from the repository root.
   dotnet clean src/desktop/XerahS.sln --nologo -c Release
   

3. If file locks persist, delete the problematic obj folder:

   Remove-Item 'ShareX.ImageEditor\src\ShareX.ImageEditor\obj' -Recurse -Force -ErrorAction SilentlyContinue
   

Phase 2: Initial Build Attempt

1. Run the packaging script:

   .\build\windows\package-windows.ps1
   

2. Check for successful completion:

   • Script should complete with exit code 0
   • Both installers should be created in the dist folder

Phase 3: Handle File Lock Failures

If you see errors like:

• CS2012: Cannot open '...ShareX.ImageEditor.dll' for writing
• The process cannot access the file ... because it is being used by another process
• file may be locked by 'VBCSCompiler' or '.NET Host' or 'csc'

Then apply these fixes:

1. Kill compiler processes again:

   Get-Process | Where-Object { 
     $_.Name -like '*VBCSCompiler*' -or 
     $_.Name -like '*dotnet*' -or 
     $_.Name -like '*csc*' 
   } | Stop-Process -Force -ErrorAction SilentlyContinue
   Start-Sleep -Seconds 2
   

2. Remove the locked obj folder:

   Remove-Item 'ShareX.ImageEditor\src\ShareX.ImageEditor\obj\Release' -Recurse -Force -ErrorAction SilentlyContinue
   

3. Pre-build the ShareX.ImageEditor project separately with single-threaded compilation:

   dotnet build 'ShareX.ImageEditor\src\ShareX.ImageEditor\ShareX.ImageEditor.csproj' -c Release -p:UseSharedCompilation=false /m:1
   

   • The /m:1 flag forces single-threaded build
   • UseSharedCompilation=false disables the VBCSCompiler server

4. Re-run the packaging script:

   .\build\windows\package-windows.ps1
   

Phase 4: Fallback - Manual ARM64 Build

If ARM64 continues to fail but x64 succeeds, build ARM64 manually:

1. Clean and kill processes:

   Get-Process | Where-Object { $_.Name -like '*VBCSCompiler*' -or $_.Name -like '*dotnet*' } | Stop-Process -Force -ErrorAction SilentlyContinue
   Remove-Item 'ShareX.ImageEditor\src\ShareX.ImageEditor\obj\Release' -Recurse -Force -ErrorAction SilentlyContinue
   

2. Pre-build ShareX.ImageEditor:

   dotnet build 'ShareX.ImageEditor\src\ShareX.ImageEditor\ShareX.ImageEditor.csproj' -c Release -p:UseSharedCompilation=false /m:1
   

3. Publish ARM64 manually:

   $root = (Get-Location).Path
   $project = "$root\src\desktop\app\XerahS.App\XerahS.App.csproj"
   $publishOutput = "$root\build\publish-temp-win-arm64"
   
   dotnet publish $project -c Release -p:OS=Windows_NT -r win-arm64 -p:PublishSingleFile=false -p:SkipBundlePlugins=true -p:UseSharedCompilation=false --self-contained true -o $publishOutput
   

4. Publish plugins:

   $pluginsDir = "$publishOutput\Plugins"
   New-Item -ItemType Directory -Force -Path $pluginsDir | Out-Null
   
   Get-ChildItem "$root\src\desktop\plugins" -Filter "*.csproj" -Recurse | ForEach-Object {
     $pluginId = $_.BaseName
     $pluginJsonPath = Join-Path $_.Directory.FullName "plugin.json"
     if (Test-Path $pluginJsonPath) {
       $json = Get-Content $pluginJsonPath -Raw | ConvertFrom-Json
       if ($json.pluginId) { $pluginId = $json.pluginId }
     }
     Write-Host "Publishing plugin: $pluginId"
     dotnet publish $_.FullName -c Release -r win-arm64 -p:UseSharedCompilation=false --self-contained false -o "$pluginsDir\$pluginId"
   }
   

5. Run Inno Setup manually:

   $isccPath = "${env:ProgramFiles(x86)}\Inno Setup 6\ISCC.exe"
   $issScript = "$root\build\windows\XerahS-setup.iss"
   $version = ([xml](Get-Content "$root\Directory.Build.props")).SelectSingleNode("//Version").InnerText.Trim()
   $outputDir = "$root\dist"
   
   & $isccPath "/dMyAppReleaseDirectory=$publishOutput" "/dOutputBaseFilename=XerahS-$version-win-arm64" "/dOutputDir=$outputDir" $issScript
   

Phase 5: Validation

1. Check that both installers exist:

   Get-ChildItem 'dist' -Filter '*.exe' | Select-Object Name, Length, LastWriteTime | Format-Table -AutoSize
   

2. Verify they were created recently (within the last few minutes)

3. Expected output:

   Name                          Length     LastWriteTime
   ----                          ------     -------------
   XerahS-{version}-win-arm64.exe  ~55-60MB   [Today's date]
   XerahS-{version}-win-x64.exe    ~55-60MB   [Today's date]
   

Important Notes

Sequential Builds Are Mandatory

NEVER run two builds at the same time. ShareX.ImageEditor targets multiple TFMs (net9.0, net10.0, net9.0-windows10.0.26100.0, net10.0-windows10.0.26100.0) and MSBuild parallelism causes all of them to race on the same ShareX.ImageEditor.dll output path, producing CS2012 file lock errors.

• Architectures: package-windows.ps1 already iterates win-x64 then win-arm64 sequentially via foreach — never invoke it twice concurrently.
• Internal parallelism: Controlled by /m:1 on the dotnet publish call, which forces single-threaded MSBuild and eliminates the intra-build race.
• Between builds: Always run dotnet build-server shutdown and kill VBCSCompiler between consecutive build sessions.

Why File Locking Happens

• VBCSCompiler: Roslyn compiler server caches assemblies for faster builds
• Parallel builds: Multiple projects trying to write the same DLL simultaneously
• Running XerahS instances: The Watch Folder daemon loads DLLs from Debug folder
• Avalonia designer: May hold references to compiled DLLs

Key Build Parameters

• -p:UseSharedCompilation=false: Disables VBCSCompiler server
• -p:nodeReuse=false: Prevents MSBuild from reusing build nodes
• /m:1: Forces single-threaded build (slower but no race conditions)
• -p:SkipBundlePlugins=true: Avoids custom MSBuild target path resolution bugs

Build Error Handling

• Don't panic if you see CS2012 errors: The build may still succeed
• Always check if XerahS.exe was created: The error might be during a retry
• ShareX.ImageEditor is the usual culprit: It has parallel TFM builds (net9.0, net10.0, with/without Windows SDK)
• ARM64 builds are more prone to locking: They run after x64 which may leave processes

Best Practices

1. Always run Phase 1 cleanup first
2. Monitor the build output for "file may be locked by" messages
3. Check actual file creation, not just exit codes
4. Keep VBCSCompiler killed during builds
5. Close any running XerahS instances before building

Success Criteria

• ✅ Both win-x64 and win-arm64 .exe installers created
• ✅ Files are ~55-60 MB in size
• ✅ Timestamps are recent (within build session)
• ✅ No lingering build processes (VBCSCompiler, dotnet, MSBuild)
• ✅ Dist folder contains the expected installer files

Troubleshooting

| Symptom | Solution | |---------|----------| | "XerahS.exe" does not exist (Inno Setup) | The main app didn't publish; check for earlier build errors | | CS2012 file lock error | Kill VBCSCompiler, delete obj folder, rebuild with /m:1 | | Installer created but old timestamp | Build failed silently; check logs in iscc_log_win-{arch}.txt | | Only x64 succeeds, ARM64 fails | Use Phase 4 manual ARM64 build process | | All builds fail | Clean solution, restart terminal, ensure no XerahS instances running |

Related Files

• Shared guardrails: build-common
• Build script: build\windows\package-windows.ps1
• Inno Setup script: build\windows\XerahS-setup.iss
• Version config: Directory.Build.props
• Build logs: build/windows/iscc_log_win-{arch}.txt