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# Bluetenshops Label Print Helper - Leine Apotheke (Hannover) |
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# |
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# Pre-configured for: |
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# Shop: https://cannabis-leineapotheke.de |
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# PDF: DYMO LabelWriter 450 Turbo (single-roll). Product label is 70 x 54 mm |
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# (Charlottenburg-style stock, i.e. DYMO 99015) - set server-side in the |
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# WP plugin, nothing to configure here. |
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# ZPL: none (no Zebra at this location) |
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# Windows: 10/11 |
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# |
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# Tiny HTTP listener on localhost that supports: |
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# POST /print-pdf - body = PDF -> silent print to the Dymo (product labels) |
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# POST /print - body = ZPL -> would route to a Zebra; unused here, kept for compatibility |
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# GET /status - health check |
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# |
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# Run: |
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# powershell -ExecutionPolicy Bypass -File label-print-helper.ps1 |
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# |
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# Auto-start on login is handled by install-helper.ps1 (Startup shortcut). |
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$ErrorActionPreference = 'Stop' |
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$Port = 9100 |
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$ZplPrinterName = '' # No Zebra at this location |
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# CONFIRMED via Get-Printer 2026-07-29. NOTE: this is the queue NAME, which the pharmacy |
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# renamed - the DriverName is "DYMO LabelWriter 450 Turbo" and the port is USB001. |
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# SumatraPDF -print-to matches the NAME column, never the driver/model. |
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$PdfPrinterName = 'LABOR_DYMO450' |
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$AllowOrigin = 'https://cannabis-leineapotheke.de' |
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# Locate a silent-print PDF engine. SumatraPDF (free, https://www.sumatrapdfreader.org/) |
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# is preferred - lightweight, native silent print. Adobe Acrobat / Reader is a fallback. |
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# This is called at startup AND on each /print-pdf request, so installing Sumatra |
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# while the helper is already running just works on the next print attempt. |
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function Find-PdfEngine { |
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$sumatraCandidates = @( |
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(Join-Path $env:LOCALAPPDATA 'SumatraPDF\SumatraPDF.exe'), |
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(Join-Path $env:LOCALAPPDATA 'Programs\SumatraPDF\SumatraPDF.exe'), |
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(Join-Path $env:LOCALAPPDATA 'Programs\SumatraPDF\SumatraPDF-3.exe'), |
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(Join-Path $env:ProgramFiles 'SumatraPDF\SumatraPDF.exe'), |
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(Join-Path ${env:ProgramFiles(x86)} 'SumatraPDF\SumatraPDF.exe') |
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) |
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foreach ($p in $sumatraCandidates) { |
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if ($p -and (Test-Path $p)) { return @{ Path = $p; Type = 'sumatra' } } |
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} |
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# PATH fallback - covers any non-standard install location |
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$cmd = Get-Command 'SumatraPDF.exe' -CommandType Application -ErrorAction SilentlyContinue | Select-Object -First 1 |
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if ($cmd) { return @{ Path = $cmd.Source; Type = 'sumatra' } } |
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$acrobatCandidates = @( |
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'C:\Program Files\Adobe\Acrobat DC\Acrobat\Acrobat.exe', |
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'C:\Program Files (x86)\Adobe\Acrobat Reader DC\Reader\AcroRd32.exe', |
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'C:\Program Files\Adobe\Acrobat Reader DC\Reader\AcroRd32.exe' |
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) |
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foreach ($p in $acrobatCandidates) { |
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if (Test-Path $p) { return @{ Path = $p; Type = 'acrobat' } } |
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} |
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return $null |
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} |
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$PdfEngine = Find-PdfEngine |
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$AcrobatExe = if ($PdfEngine) { $PdfEngine.Path } else { $null } # legacy alias |
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# --- Raw printer P/Invoke (winspool.drv) --------------------------------- |
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Add-Type -TypeDefinition @" |
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using System; |
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using System.Runtime.InteropServices; |
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public class RawPrinter { |
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[StructLayout(LayoutKind.Sequential, CharSet = CharSet.Unicode)] |
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public class DOCINFO { |
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[MarshalAs(UnmanagedType.LPWStr)] public string pDocName; |
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[MarshalAs(UnmanagedType.LPWStr)] public string pOutputFile; |
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[MarshalAs(UnmanagedType.LPWStr)] public string pDataType; |
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} |
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[DllImport("winspool.Drv", EntryPoint="OpenPrinterW", SetLastError=true, CharSet=CharSet.Unicode, ExactSpelling=true, CallingConvention=CallingConvention.StdCall)] public static extern bool OpenPrinter(string p, out IntPtr h, IntPtr pd); |
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[DllImport("winspool.Drv", EntryPoint="ClosePrinter", SetLastError=true, ExactSpelling=true, CallingConvention=CallingConvention.StdCall)] public static extern bool ClosePrinter(IntPtr h); |
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[DllImport("winspool.Drv", EntryPoint="StartDocPrinterW", SetLastError=true, CharSet=CharSet.Unicode, ExactSpelling=true, CallingConvention=CallingConvention.StdCall)] public static extern bool StartDocPrinter(IntPtr h, Int32 lvl, [In, MarshalAs(UnmanagedType.LPStruct)] DOCINFO di); |
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[DllImport("winspool.Drv", EntryPoint="EndDocPrinter", SetLastError=true, ExactSpelling=true, CallingConvention=CallingConvention.StdCall)] public static extern bool EndDocPrinter(IntPtr h); |
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[DllImport("winspool.Drv", EntryPoint="StartPagePrinter", SetLastError=true, ExactSpelling=true, CallingConvention=CallingConvention.StdCall)] public static extern bool StartPagePrinter(IntPtr h); |
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[DllImport("winspool.Drv", EntryPoint="EndPagePrinter", SetLastError=true, ExactSpelling=true, CallingConvention=CallingConvention.StdCall)] public static extern bool EndPagePrinter(IntPtr h); |
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[DllImport("winspool.Drv", EntryPoint="WritePrinter", SetLastError=true, ExactSpelling=true, CallingConvention=CallingConvention.StdCall)] public static extern bool WritePrinter(IntPtr h, IntPtr buf, Int32 cnt, out Int32 written); |
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public static bool Send(string printer, byte[] bytes) { |
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IntPtr h; |
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var di = new DOCINFO { pDocName = "Mini Label", pDataType = "RAW" }; |
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if (!OpenPrinter(printer, out h, IntPtr.Zero)) return false; |
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try { |
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if (!StartDocPrinter(h, 1, di)) return false; |
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try { |
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if (!StartPagePrinter(h)) return false; |
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IntPtr buf = Marshal.AllocCoTaskMem(bytes.Length); |
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try { |
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Marshal.Copy(bytes, 0, buf, bytes.Length); |
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Int32 written; |
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if (!WritePrinter(h, buf, bytes.Length, out written)) return false; |
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} finally { Marshal.FreeCoTaskMem(buf); } |
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EndPagePrinter(h); |
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} finally { EndDocPrinter(h); } |
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} finally { ClosePrinter(h); } |
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return true; |
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} |
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} |
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"@ |
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# --- HTTP listener ------------------------------------------------------- |
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$listener = New-Object System.Net.HttpListener |
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$listener.Prefixes.Add("http://localhost:$Port/") |
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$listener.Prefixes.Add("http://127.0.0.1:$Port/") |
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$listener.Start() |
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Write-Host "Label helper listening on http://localhost:$Port" |
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Write-Host " ZPL printer: $ZplPrinterName" |
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Write-Host " PDF printer: $PdfPrinterName (via $(if ($PdfEngine) { "$($PdfEngine.Type): $(Split-Path -Leaf $PdfEngine.Path)" } else { 'NO PDF ENGINE FOUND - install SumatraPDF or Acrobat Reader' }))" |
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function Set-Cors($resp) { |
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$resp.Headers.Add('Access-Control-Allow-Origin', $AllowOrigin) |
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$resp.Headers.Add('Access-Control-Allow-Methods', 'POST, GET, OPTIONS') |
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$resp.Headers.Add('Access-Control-Allow-Headers', 'Content-Type') |
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$resp.Headers.Add('Vary', 'Origin') |
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} |
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function Send-Text($resp, $code, $text) { |
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$resp.StatusCode = $code |
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$resp.ContentType = 'text/plain; charset=utf-8' |
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$bytes = [Text.Encoding]::UTF8.GetBytes($text) |
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$resp.ContentLength64 = $bytes.Length |
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$resp.OutputStream.Write($bytes, 0, $bytes.Length) |
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$resp.OutputStream.Close() |
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} |
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while ($listener.IsListening) { |
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try { |
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$ctx = $listener.GetContext() |
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$req = $ctx.Request |
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$resp = $ctx.Response |
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Set-Cors $resp |
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# CORS preflight |
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if ($req.HttpMethod -eq 'OPTIONS') { |
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$resp.StatusCode = 204 |
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$resp.Close() |
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continue |
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} |
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# Health check - used by the dialog to detect the helper |
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if ($req.Url.AbsolutePath -eq '/status' -and $req.HttpMethod -eq 'GET') { |
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if (-not $PdfEngine) { $PdfEngine = Find-PdfEngine } # late-installed Sumatra/Acrobat picked up here |
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$pdfReady = if ($PdfEngine) { 'yes' } else { 'no' } |
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# Local must NOT case-collide with the script-scope $PdfEngine hashtable; |
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# PowerShell 5.1 treats $pdfEngine and $PdfEngine as the SAME variable, and |
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# the earlier `$pdfEngine = ...Type` would clobber $PdfEngine with a string, |
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# making the very next /print-pdf call hit Start-Process -FilePath $null. |
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# See bluetenshops/scripts/README.md "PS 5.1 case-insensitivity trap". |
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$pdfEngineLabel = if ($PdfEngine) { $PdfEngine.Type } else { 'none' } |
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# Does the configured printer actually exist on this machine? SumatraPDF |
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# -print-to needs an EXACT name match and fails QUIETLY when it does not, |
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# so surface the mismatch here at install time instead of at print time. |
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$printerFound = 'unknown' |
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try { |
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$names = @(Get-Printer -ErrorAction Stop | Select-Object -ExpandProperty Name) |
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$printerFound = if ($names -contains $PdfPrinterName) { 'yes' } else { 'NO' } |
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} catch { $printerFound = 'unknown' } |
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Send-Text $resp 200 "ok zpl=$ZplPrinterName pdf=$PdfPrinterName pdfReady=$pdfReady pdfEngine=$pdfEngineLabel pdfPrinterFound=$printerFound" |
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continue |
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} |
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# ZPL print endpoint (Zebra) - not used at Leine Apotheke, but kept for protocol compatibility |
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if ($req.Url.AbsolutePath -eq '/print' -and $req.HttpMethod -eq 'POST') { |
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$reader = New-Object IO.StreamReader $req.InputStream, ([Text.Encoding]::UTF8) |
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$zpl = $reader.ReadToEnd() |
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$reader.Close() |
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if (-not $zpl) { Send-Text $resp 400 'empty body'; continue } |
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# Override printer with ?printer=... if provided (e.g. ZD421 alongside ZD410) |
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$targetZplPrinter = $req.QueryString['printer'] |
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if (-not $targetZplPrinter) { $targetZplPrinter = $ZplPrinterName } |
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if (-not $targetZplPrinter) { Send-Text $resp 500 'no zpl printer configured'; continue } |
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$bytes = [Text.Encoding]::ASCII.GetBytes($zpl) |
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$ok = [RawPrinter]::Send($targetZplPrinter, $bytes) |
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if ($ok) { |
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Write-Host ("[{0}] ZPL printed {1} bytes -> {2}" -f (Get-Date -Format HH:mm:ss), $bytes.Length, $targetZplPrinter) |
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Send-Text $resp 200 'printed' |
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} else { |
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Write-Host ("[{0}] ZPL FAILED - printer offline?" -f (Get-Date -Format HH:mm:ss)) |
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Send-Text $resp 500 'print failed' |
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} |
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continue |
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} |
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# PDF print endpoint (Dymo) |
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if ($req.Url.AbsolutePath -eq '/print-pdf' -and $req.HttpMethod -eq 'POST') { |
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if (-not $PdfEngine) { $PdfEngine = Find-PdfEngine } # rescan in case Sumatra/Acrobat got installed after the helper started |
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if (-not $PdfEngine) { Send-Text $resp 500 'no pdf engine installed (install SumatraPDF or Acrobat Reader)'; continue } |
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# Override printer with ?printer=... if provided |
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$targetPrinter = $req.QueryString['printer'] |
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if (-not $targetPrinter) { $targetPrinter = $PdfPrinterName } |
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# Read PDF bytes from request body to a temp file |
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$tmpPdf = Join-Path $env:TEMP ("bs-label-" + [Guid]::NewGuid().ToString() + ".pdf") |
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$fs = [IO.File]::Create($tmpPdf) |
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$req.InputStream.CopyTo($fs) |
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$fs.Close() |
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$size = (Get-Item $tmpPdf).Length |
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if ($size -lt 100) { |
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Remove-Item $tmpPdf -Force -ErrorAction SilentlyContinue |
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Send-Text $resp 400 'pdf too small' |
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continue |
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} |
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try { |
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if ($PdfEngine.Type -eq 'sumatra') { |
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# SumatraPDF: -print-to "Printer" -silent "file.pdf" |
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$argString = "-print-to `"$targetPrinter`" -silent `"$tmpPdf`"" |
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} else { |
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# Acrobat: /n = new instance, /t = silent print to named printer, then close |
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$argString = "/n /t `"$tmpPdf`" `"$targetPrinter`"" |
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} |
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$proc = Start-Process -FilePath $PdfEngine.Path ` |
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-ArgumentList $argString ` |
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-PassThru -WindowStyle Hidden |
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# Engine should exit on its own; give it up to 30 s |
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if (-not $proc.WaitForExit(30000)) { |
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$proc.Kill() |
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Write-Host ("[{0}] PDF TIMEOUT killed {1}" -f (Get-Date -Format HH:mm:ss), $PdfEngine.Type) |
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Send-Text $resp 500 "$($PdfEngine.Type) timeout" |
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continue |
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} |
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Write-Host ("[{0}] PDF printed {1} bytes -> {2} (via {3})" -f (Get-Date -Format HH:mm:ss), $size, $targetPrinter, $PdfEngine.Type) |
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Send-Text $resp 200 'printed' |
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} finally { |
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Remove-Item $tmpPdf -Force -ErrorAction SilentlyContinue |
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} |
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continue |
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} |
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Send-Text $resp 404 'not found' |
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} catch { |
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Write-Host "Error: $_" |
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} |
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} |
