打印预览无法正常工作laravel-dompdf

Question

我正在开发一种用于管理快餐场所的多个分支的应用程序，它位于共享主机中，并尝试使用barryvdh / laravel-dompdf库在热敏打印机（客户端）中打印两张票证（一张用于发票和其他订单）。想法是在发票被注册时，然后显示用于打印两个票证的选项。但是，现在没有显示网络打印预览，仅注册发票并在日志中显示此错误“ PrinterController :: pdf尝试转换时传递了无效字符，这些字符已被忽略”。应用程序使用Laravel 5.8，php 7.3和laravel-dompdf 0.8.5。我将不胜感激，对此我已经坚持了几天...

SalesController：

public function store(Request $request){

        try{

            $data = $request->all();
            $client = json_decode($data['client']);
            $till = Till::where('id', session('till'))->first();

            DB::beginTransaction();

            // ============================= INVOICE CREATION ==================================
            $branch_id = Branch::where('id', auth()->user()->branch_id)->pluck('code')->first();
            $user_code = (integer) substr((string) auth()->user()->ci, -3);
            $previous_id = Invoice::whereRaw("id = (select max(id) from invoices where id like '" . $branch_id . $user_code . "%')")->pluck('id')->first();


            if ($previous_id == null) {
                $pre_id = $branch_id . $user_code;
                $id = str_pad($pre_id, 10, "0", STR_PAD_RIGHT);
            }

            if ($previous_id != null)
                $id = $previous_id + 1;


            $invoice = new Invoice();
            $invoice->id = $id;
            $invoice->payment_id = 1;
            $invoice->client_id = $client->id;
            $invoice->received = $data['total_received'];
            $invoice->total = 0;
            $invoice->save();


            // ============================= INVOICE DETAIL ====================================

            $product_detail = $request->session('products')->all();
            $sum = 0;
            foreach ($product_detail['products'] as $item) {
                $detail = new InvoiceDetail();
                $detail->invoice_id = $invoice->id;
                $detail->product_id = $item->id;
                $detail->quantity = $item->quantity;
                $detail->sub_total = (integer) $item->quantity*(integer) $item->price;// modificar a sub total
                $detail->save();

                $sum += $detail->sub_total;

                $actual_stock = Stock::where('product_id', $item->id)->where('branch_id', auth()->user()->branch_id)->first();
                $new_stock = (integer) $actual_stock->quantity - (integer) $item->quantity;

                if ($item->quantity > $actual_stock->quantity)
                    return redirect()->back()->with('error', 'La cantidad solicitada supera el stock disponible');

                $stock = Stock::find($actual_stock->id);
                $stock->quantity = $new_stock;
                $stock->save();

                $stock_history = new StockHistory();
                $stock_history->stock_id = $stock->id;
                $stock_history->product_id = $item->id;
                $stock_history->type = 'sales';
                $stock_history->old_quantity = $actual_stock->quantity;
                $stock_history->new_quantity = $new_stock;
                $stock_history->ext_trans = $invoice->id;
                $stock_history->user_id = auth()->user()->id;
                $stock_history->save();
            }


            // ================================= ORDER =========================================

            $order = new Order();
            $order->invoice_id = $invoice->id;
            $order->status = 0;
            $order->save();


            // ================================= SALES =========================================

            $sales = new Sales();
            $sales->invoice_id = $invoice->id;
            $sales->client_id = auth()->user()->id;
            $sales->till_id = session('till');
            $sales->save();


            // ============================= TILL_TRANSACTION ==================================

            $invoice = Invoice::find($invoice->id);
            $invoice->total = $sum;
            $invoice->save();

            foreach (session('products') as $item) {
                $old_quantity = Stock::where('product_id', $item->id)->where('branch_id', auth()->user()->branch_id)->first();
                $update = Stock::find($old_quantity->id);
                $update->quantity = $old_quantity->quantity - $item->quantity;
                $update->save();
            }


            $till_transaction = new TillTransaction();
            $till_transaction->till_id = session('till');
            $till_transaction->type_id= 3;
            $till_transaction->detail_id = $sales->id;
            $till_transaction->cash_before_op = $till->actual_cash;
            $till_transaction->cash_after_op = $till->actual_cash + $invoice->total;
            $till_transaction->user_id = auth()->user()->id;
            $till_transaction->save();

            DB::commit();

            $branch = Branch::where('id', auth()->user()->branch_id)->pluck('name')->first();
            $change = $invoice->received - $invoice->total;

            $printer = new PrinterController();
            $printer->printPDF($invoice, $product_detail['products'], $branch, $change, $order);

            session(["products"=>[]]);

            return redirect()->back()->with('success', 'Se ha registrado la venta');

        } catch (\Exception $e){
            DB::rollBack();
            Log::error('SalesController::store ' . $e->getMessage(), ['error_line' => $e->getLine()]);
            return redirect()->back()->with('error', 'Oops parece que ocurrio un error, por favor intente nuevamente.');
        }
    }

PrinterController：

namespace App\Http\Controllers;

use Barryvdh\DomPDF\Facade as PDF;
use Illuminate\Support\Facades\Log;

class PrinterController extends Controller
{
    public function printPDF($invoice, $products, $branch, $change, $order){

        try{

            $data = [
                'invoice' => $invoice,
                'product_detail' => $products,
                'branch' =>  $branch,
                'change' => $change,
                'order' => $order
            ];

            $invoice = PDF::loadView('ticket.invoice', $data);
            return $invoice->stream('test.pdf');


        } catch (\Exception $e){
            Log::error('PrinterController::pdf ' . $e->getMessage(), ['error_line' => $e->getLine()]);
            return redirect()->back()->with('error', 'Oops parece que ocurrio un error al imprimir el ticket.');
        } catch (\Throwable $e) {
            Log::error('PrinterController::pdf ' . $e->getMessage(), ['error_line' => $e->getLine()]);
            return redirect()->back()->with('error', 'Oops parece que ocurrio un error al imprimir el ticket.');
        }

    }
}

发票视图：

<html>
<head>
    <meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>

    <style>
        body {
            font-family: Nunito }

        .detail{
            text-align: end !important;
        }
    </style>
</head>
<body>
<div class="ticket">
    <div>
        <img src="../images/logo.png" style="width: 130px; margin-left: 60px;">
        <h4><strong>Nro de Orden: {{ $order->id }}</strong></h4>
        <br>
        <h5 style="margin-top: -15px"><strong>Nro Factura: {{ $invoice->id }}</strong></h5>
        <h5 style="margin-top: -10px"><strong>Fecha: {{ date( "d/m/Y", strtotime($invoice->created_at)) }} </strong> &nbsp; <strong>Hora: {{ date( "H:i:s", strtotime($invoice->created_at)) }}</strong></h5>

    </div>

    <table>
        <hr>
        <thead>
        <tr style="font-size: 17px">
            <td><strong>Articulo</strong></td>
            <td><strong>Cant.</strong></td>
            <td style="padding-left: 10px"><strong>Precio</strong></td>
            <td style="padding-left: 20px; text-align: right"><strong>Sub Total</strong></td>
        </tr>
        </thead>
        <tbody>

        @foreach($product_detail as $product)
            <tr>
                <td>{{ $product->name  }}</td>
                <td>{{ $product->quantity  }}</td>
                <td style="padding-left: 10px">{{ $product->price }}</td>
                <td style="padding-left: 30px">{{ (integer) $product->quantity * (integer) $product->price  }}</td>
            </tr>
        @endforeach
        </tbody>

        <tfoot>
            <tr class="detail">
                <td colspan="3" style="padding-top: 20px"><strong>Total: </strong></td>
                <td style="padding-top: 20px">{{ $invoice->total }}</td>
            </tr>
            <tr class="detail">
                <td colspan="3"><strong>Recibido: </strong></td>
                <td>{{ $invoice->received }}</td>
            </tr>
            <tr class="detail">
                <td colspan="3"><strong>Su Vuelto: </strong></td>
                <td>{{ $change }}</td>
            </tr>
        </tfoot>
    </table>
    <hr>
    <div style="margin-top: 9px; margin-bottom: -15px">
        <h5 style="margin-bottom: -10px"><strong>Local: {{ $branch  }}</strong></h5>
        <h5><strong>Cajero: {{ auth()->user()->name }}</strong></h5>
        <h4>Gracias por su compra!</h4>
    </div>
    <p>--------------------------------------------</p>
    <p style="font-size: 13px; text-align: center">DOCUMENTO NO VALIDO COMO FACTURA</p>
</div>
</body>
</html>

订单视图：

<html>
<head>
    <!-- Styles -->
    <link href="{{ asset('css/app.css') }}" rel="stylesheet">
    <link href="{{ asset('fontawesome/css/all.css') }}" rel="stylesheet">

    <style>
        .ticket {
            width: 283px;
            max-width: 280px;
        }
    </style>
</head>
<body>
<div class="ticket" >
    <table class="table" style="border-top: hidden">
        <caption style="caption-side: top; text-align: center">ORDEN N° 002517</caption>
        <caption style="caption-side: top; margin-top: -20px; margin-bottom: -15px">=============================</caption>
        <caption style="caption-side: bottom; margin-top: -20px; margin-bottom: -15px">=============================</caption>
        <caption style="caption-side: bottom; margin-bottom: -15px">Solicitado: 2019/12/30 -- 22:51:33</caption>
        <thead>
        <tr>
            <th>Art.</th>
            <th>Cant.</th>
        </tr>
        </thead>
        <tbody>
        <tr>
            <td>Producto de prueba</td>
            <td>10</td>
        </tr>
        </tbody>
    </table>
</div>
</body>
</html>

Answer 1

您看到的错误