Initial Programm

src-tauri/.gitignore

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+# Generated by Cargo
+# will have compiled files and executables
+/target/
+
+# Generated by Tauri
+# will have schema files for capabilities auto-completion
+/gen/schemas

src-tauri/Cargo.toml

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+[package]
+name = "OH5_QR_Code_Generator"
+version = "0.1.0"
+description = "OH5 QR Code Generator"
+authors = ["jpk aka Shiro"]
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[build-dependencies]
+tauri-build = { version = "2", features = [] }
+
+[dependencies]
+tauri = { version = "2", features = [] }
+tauri-plugin-opener = "2"
+serde = { version = "1", features = ["derive"] }
+serde_json = "1"
+anyhow = "1"
+qrcode = { version = "0.14", features = ["image"] }
+image = "0.25"
+urlencoding = "2.1"
+base64 = "0.22"

src-tauri/build.rs

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+fn main() {
+    tauri_build::build()
+}

src-tauri/capabilities/default.json

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+{
+  "$schema": "../gen/schemas/desktop-schema.json",
+  "identifier": "default",
+  "description": "Capability for the main window",
+  "windows": ["main"],
+  "permissions": [
+    "core:default",
+    "opener:default"
+  ]
+}

src-tauri/src/main.rs

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+#![cfg_attr(not(debug_assertions), windows_subsystem = "windows")]
+
+use serde::{Deserialize, Serialize};
+use qrcode::{QrCode, EcLevel};
+use image::{DynamicImage, ImageFormat, imageops, Luma};
+use base64::Engine;
+use urlencoding::encode;
+
+#[derive(Debug, Deserialize)]
+struct GeneratePayload {
+  name: String,
+  customer_no: String,
+  machine_from: u32,
+  machine_to: Option<u32>,     // None => Single
+  text_body: String,
+  include_icon: bool,
+  icon_bytes: Option<Vec<u8>>, // PNG/JPG bytes (optional)
+  to_email: Option<String>, 
+}
+
+#[derive(Debug, Serialize)]
+struct OutputItem {
+  label: String,
+  filename: String,
+  png_base64: String,
+}
+
+#[derive(Debug, Serialize)]
+struct Output {
+  items: Vec<OutputItem>,
+}
+
+fn build_mailto(
+    to: Option<&str>,
+    name: &str,
+    customer_no: &str,
+    machine_id: u32,
+    body: &str,
+) -> String {
+    // Betreff nur Kundennummer + Fixtext
+    let subject = format!("Kunde: {} hat einen Fehler. QR Code Scan!", customer_no);
+
+    // Body enthält Firmenname, Kundennummer, Maschine + freien Text
+    let full_body = format!(
+        "Kunde: {}\n\nKundennummer: {}\n\nMaschine: {}\n\n{}",
+        name,
+        customer_no,
+        machine_id,
+        body
+    );
+
+    let subject_enc = encode(&subject);
+    let body_enc = encode(&full_body);
+
+    if let Some(addr) = to.filter(|s| !s.is_empty()) {
+        format!("mailto:{}?subject={}&body={}", addr, subject_enc, body_enc)
+    } else {
+        format!("mailto:?subject={}&body={}", subject_enc, body_enc)
+    }
+}
+
+
+
+fn render_qr_png(data: &str, icon_bytes: Option<&[u8]>) -> anyhow::Result<Vec<u8>> {
+  // Hohe Fehlerkorrektur, damit Icon robust ist
+  let code = QrCode::with_error_correction_level(data.as_bytes(), EcLevel::Q)?;
+  let target = 1024u32;
+
+  let qr_luma = code
+      .render::<Luma<u8>>()
+      .min_dimensions(target, target)
+      .quiet_zone(true)
+      .build();
+
+  let mut qr_rgba = DynamicImage::ImageLuma8(qr_luma).to_rgba8();
+
+  if let Some(bytes) = icon_bytes {
+    if let Ok(mut icon) = image::load_from_memory(bytes).map(|i| i.into_rgba8()) {
+      // Icon auf ~20% der QR-Breite skalieren
+      let target_w = (qr_rgba.width() as f32 * 0.20) as u32;
+      let scale = target_w as f32 / icon.width().max(1) as f32;
+      let target_h = (icon.height() as f32 * scale).round().max(1.0) as u32;
+      icon = imageops::resize(&icon, target_w, target_h, imageops::FilterType::Lanczos3);
+
+      let x = (qr_rgba.width() - icon.width()) / 2;
+      let y = (qr_rgba.height() - icon.height()) / 2;
+      imageops::overlay(&mut qr_rgba, &icon, x.into(), y.into());
+    }
+  }
+
+    let dyn_img = DynamicImage::ImageRgba8(qr_rgba);
+    let mut buf = Vec::new();
+    dyn_img.write_to(&mut std::io::Cursor::new(&mut buf), ImageFormat::Png)?;
+    Ok(buf)
+}
+
+#[tauri::command]
+fn generate_qr(payload: GeneratePayload) -> Result<Output, String> {
+  let mut items = Vec::new();
+
+  let from = payload.machine_from;
+  let to = payload.machine_to.unwrap_or(from);
+
+  if to < from {
+    return Err("Ungültiger Bereich: Bis < Von".into());
+  }
+
+  let icon: Option<&[u8]> = if payload.include_icon {
+    payload.icon_bytes.as_deref()
+  } else {
+    None
+  };
+
+  for id in from..=to {
+    let to_addr = payload.to_email.as_deref().filter(|s| !s.is_empty()).unwrap_or("service@oh5.de");
+
+    let data = build_mailto(Some(to_addr), &payload.name, &payload.customer_no, id, &payload.text_body);
+    let png = render_qr_png(&data, icon).map_err(|e| format!("QR-Fehler: {e}"))?;
+    let b64 = base64::engine::general_purpose::STANDARD.encode(png);
+    let label = if from == to {
+      format!("Kunde: {}\nKundennummer: {}\nID: {}", payload.name, payload.customer_no, id)
+    } else {
+      //format!("ID: {}", id)
+        format!("Kunde: {}\nKundennummer: {}\nID: {}", payload.name, payload.customer_no, id)
+    };
+    let filename = format!("qr_{}_{}_{}.png", sanitize(&payload.name), payload.customer_no, id);
+    items.push(OutputItem { label, filename, png_base64: b64 });
+  }
+
+  Ok(Output { items })
+}
+
+// kleine Dateinamen-Helferfunktion
+fn sanitize(s: &str) -> String {
+  let mut out = String::with_capacity(s.len());
+  for ch in s.chars() {
+    if ch.is_ascii_alphanumeric() || ch == '-' || ch == '_' {
+      out.push(ch);
+    } else if ch.is_whitespace() {
+      out.push('_');
+    }
+  }
+  if out.is_empty() { "kunde".to_string() } else { out }
+}
+
+fn main() {
+  tauri::Builder::default()
+    .invoke_handler(tauri::generate_handler![generate_qr])
+    .run(tauri::generate_context!())
+    .expect("error while running tauri application");
+}

src-tauri/tauri.conf.json

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+{
+  "$schema": "https://schema.tauri.app/config/2",
+  "productName": "OH5 QR Code Generator",
+  "version": "0.1.0",
+  "identifier": "com.jpk.oh5-qr-generator",
+  "build": {
+    "frontendDist": "../src"
+  },
+  "app": {
+    "withGlobalTauri": true,
+    "windows": [
+      {
+        "title": "OH5 QR Code Generator",
+        "width": 1280,
+        "height": 700
+      }
+    ],
+    "security": {
+      "csp": null
+    }
+  },
+  "bundle": {
+    "active": true,
+    "targets": "all",
+    "icon": [
+      "icons/icon.png",
+      "icons/icon.ico"
+    ]
+  }
+}