c# - 如何使用 PrintDocument 在热敏打印机上打印文本文件？

Question

我正在使用 C# 和 Winforms 创建一个应用程序，现在我需要在热敏打印机上打印销售收据。为此，我正在创建一个文本文件并读取它以使用 PrintDocument 进行打印，但我无法执行此操作，因为我不知道如何配置纸张大小、在纸张上对齐文本中心以及其他配置。当我打印时，文本文件被打印出来了，但是很乱，打印结束后纸张就不会停止。

我该怎么做？

尝试。

private PrintDocument printDocument = new PrintDocument();
private static String RECEIPT = Environment.CurrentDirectory + @"\comprovantes\comprovante.txt";
private String stringToPrint = "";

private void button1_Click(object sender, EventArgs e)
{
    generateReceipt();
    printReceipt();
}

private void generateReceipt()
{
    FileStream fs = new FileStream(COMPROVANTE, FileMode.Create);
    StreamWriter writer = new StreamWriter(fs);
    writer.WriteLine("==========================================");
    writer.WriteLine("          NOME DA EMPRESA AQUI            ");
    writer.WriteLine("==========================================");
    writer.Close();
    fs.Close();
}

private void printReceipt()
{
    FileStream fs = new FileStream(COMPROVANTE, FileMode.Open);
    StreamReader sr = new StreamReader(fs);
    stringToPrint = sr.ReadToEnd();
    printDocument.PrinterSettings.PrinterName = DefaultPrinter.GetDefaultPrinterName();
    printDocument.PrintPage += new PrintPageEventHandler(printPage);
    printDocument.Print();
    sr.Close();
    fs.Close();
}

private void printPage(object sender, PrintPageEventArgs e)
{
    int charactersOnPage = 0;
    int linesPerPage = 0;
    Graphics graphics = e.Graphics;

    // Sets the value of charactersOnPage to the number of characters 
    // of stringToPrint that will fit within the bounds of the page.
    graphics.MeasureString(stringToPrint, this.Font,
        e.MarginBounds.Size, StringFormat.GenericTypographic,
        out charactersOnPage, out linesPerPage);

    // Draws the string within the bounds of the page
    graphics.DrawString(stringToPrint, this.Font, Brushes.Black,
        e.MarginBounds, StringFormat.GenericTypographic);

    // Remove the portion of the string that has been printed.
    stringToPrint = stringToPrint.Substring(charactersOnPage);

    // Check to see if more pages are to be printed.
    e.HasMorePages = (stringToPrint.Length > 0);
}

我正在尝试创建这种收据模型。

使用RDLC，但是开始打印很慢。我关注这个 example

//works but slow
private void Run() {
    LocalReport report = new LocalReport();
    report.ReportPath = @"..\..\reports\ReciboDeVenda.rdlc";
    Export(report);
    Print();
}

private void Export(LocalReport report) {
    string deviceInfo =
      @"<DeviceInfo>
        <OutputFormat>EMF</OutputFormat>
        <PageWidth>8.5in</PageWidth>
        <PageHeight>11in</PageHeight>
        <MarginTop>0.25in</MarginTop>
        <MarginLeft>0.25in</MarginLeft>
        <MarginRight>0.25in</MarginRight>
        <MarginBottom>0.25in</MarginBottom>
    </DeviceInfo>";
    Warning[] warnings;
    m_streams = new List<Stream>();
    report.Render("Image", deviceInfo, CreateStream,
       out warnings);
    foreach (Stream stream in m_streams)
        stream.Position = 0;
}

private Stream CreateStream(string name, string fileNameExtension, 
                            Encoding encoding, string mimeType, bool willSeek) {
        Stream stream = new MemoryStream();
        m_streams.Add(stream);
        return stream;
}

private void Print() {
    if (m_streams == null || m_streams.Count == 0)
        throw new Exception("Error: no stream to print.");
    PrintDocument printDoc = new PrintDocument();
    printDoc.PrinterSettings.PrinterName = DefaultPrinter.GetDefaultPrinterName();
    if (!printDoc.PrinterSettings.IsValid) {
        throw new Exception("Error: cannot find the default printer.");
    }else {
        printDoc.PrintPage += new PrintPageEventHandler(PrintPage);
        m_currentPageIndex = 0;
        printDoc.Print();
    }
}

private void PrintPage(object sender, PrintPageEventArgs ev) {
    Metafile pageImage = new Metafile(m_streams[m_currentPageIndex]);

    // Adjust rectangular area with printer margins.
    Rectangle adjustedRect = new Rectangle(
        ev.PageBounds.Left - (int)ev.PageSettings.HardMarginX,
        ev.PageBounds.Top - (int)ev.PageSettings.HardMarginY,
        ev.PageBounds.Width,
        ev.PageBounds.Height);

    // Draw a white background for the report
    ev.Graphics.FillRectangle(Brushes.White, adjustedRect);

    // Draw the report content
    ev.Graphics.DrawImage(pageImage, adjustedRect);

    // Prepare for the next page. Make sure we haven't hit the end.
    m_currentPageIndex++;
    ev.HasMorePages = (m_currentPageIndex < m_streams.Count);
}

Answer 1

如果我想自己创建报告，而不是尝试创建文本文件，我将使用 HTML 进行呈现。另外为了使渲染逻辑和混合 html 标签和数据更简单，我会使用 T4 Run-time Text Templates .然后我可以将数据传递给 html 模板并简单地呈现报告。然后将输出字符串分配给 WebBrowser 的 DocumentText 属性就足够了并称其为Print方法。

下载

您可以从 r-aghaei/HtmlUsingRuntimeT4 克隆或下载工作示例.

为什么是 HTML？

因为格式简单灵活。您可以使用 html 标签和 css 样式的所有功能来格式化文本。它确实比使用 DrawString 好。

为什么要使用运行时文本模板？

因为它使混合数据和 html 变得非常容易，并且您可以使用 C# 语言执行一些任务，例如计算总和、迭代模型记录等。它使用 T4 模板引擎，让您可以在运行时使用模板并将数据提供给模板。

示例

1- 向项目添加模型:

using System;
using System.Collections.Generic;

namespace Sample
{
    public class ReportModel
    {
        public string CustomerName { get; set; }
        public DateTime Date { get; set; }
        public List<OrderItem> OrderItems { get; set; }
    }
    public class OrderItem
    {
        public string Name { get; set; }
        public int Price { get; set; }
        public int Count { get; set; }
    }
}

2- 将运行时文本模板(也称为预处理文本模板)添加到项目并将其命名为 ReportTemplate.tt。打开它并添加这样的代码:

<#@ template language="C#"#>
<#@ import namespace="System.Linq" #>
<#@ import namespace="System.Collections.Generic" #>
<#@ parameter name="Model" type="Sample.ReportModel"#>
<html>
<head>
    <title></title>
    <style type="text/css">
        body { font-family: Calibri;width:400px;}
        table { text-align:center; }
        .container {width:400px; height:100%;}
    </style>
</head>
<body>
<div class="container">
<h1 style="text-align:center;">Order</h1>
<hr/>
<table style="width:100%">
    <tr>
        <td>Customer: <#=Model.CustomerName#></td>
        <td>Order Date: <#=Model.Date#></td>
    </tr>
</table>
<hr/>
<table style="width:100%">
    <tr><th>Index</th><th>Name</th><th>Price</th><th>Count</th><th>Sum</th></tr>
    <#
    int index =1;
    foreach(var item in Model.OrderItems) 
    {
    #>
    <tr>
        <td><#=index#></td>
        <td><#=item.Name#></td>
        <td><#=item.Price#></td>
        <td><#=item.Count#></td>
        <td><#=item.Count * item.Price#></td>
    </tr>
    <#
        index++;
    }
    var total= Model.OrderItems.Sum(x=>x.Count * x.Price);
    #>
    <tr><td></td><td></td><td></td><th>Total:</th><th><#=total#></th></tr>
</table>
<div>
</body>
</html>

3- 将 WebBrowser 控件放在窗体上，并在要生成报告的位置编写此类代码:

var rpt = new ReportTemplate();
rpt.Session = new Dictionary<string, object>();
rpt.Session["Model"] = new Sample.ReportModel
{
    CustomerName = "Reza",
    Date = DateTime.Now,
    OrderItems = new List<Sample.OrderItem>()
    {
        new Sample.OrderItem(){Name="Product 1", Price =100, Count=2 },
        new Sample.OrderItem(){Name="Product 2", Price =200, Count=3 },
        new Sample.OrderItem(){Name="Product 3", Price =50, Count=1 },
    }
};
rpt.Initialize();
this.webBrowser1.DocumentText= rpt.TransformText();

4- 如果你想打印报告，你可以调用:

this.webBrowser1.Print();

您应该在文档完成后调用Print。因此，如果您想直接打印而不向用户显示输出，您可以处理 DocumentCompleted 事件并在那里调用 Print。

结果如下: