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   源码介绍

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USB打印小票DEMO

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Drawing.Printing;
using System.IO;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace LptPrint_test
{
    public partial class Form2 : Form
    {
        public Form2()
        {
            InitializeComponent();
        }

        private void Form2_Load(object sender, EventArgs e)
        {

        }

        private StringReader sr;

        public bool Print(string sb)
        {
            bool result = true;
            try
            {

                sr = new StringReader(sb.ToString());

                PrintDocument pd = new PrintDocument();
                pd.PrintController = new System.Drawing.Printing.StandardPrintController();
                pd.DefaultPageSettings.Margins.Top = 2;
                pd.DefaultPageSettings.Margins.Left = 0;
                //pd.DefaultPageSettings.PaperSize.Width = 320;
                //pd.DefaultPageSettings.PaperSize.Height = 5150;
                pd.PrinterSettings.PrinterName = pd.DefaultPageSettings.PrinterSettings.PrinterName;//默认打印机
                pd.PrintPage  = new PrintPageEventHandler(this.pd_PrintPage);
                pd.Print();

            }
            catch (Exception ex)
            {
                result = false;
            }
            finally
            {
                if (sr != null)
                    sr.Close();
            }
            return result;
        }

        private void pd_PrintPage(object sender, PrintPageEventArgs ev)
        {
            //注意：此方法不管是串口，并口，还是USB接口的打印机都可以调用，前提是一定要将打印机设为默认打印机。

            Font printFont = new Font("Arial", 9);//打印字体

            float linesPerPage = 0;
            float yPos = 0;
            int count = 0;
            float leftMargin = ev.MarginBounds.Left;
            float topMargin = ev.MarginBounds.Top;
            String line = "";

            linesPerPage = ev.MarginBounds.Height / printFont.GetHeight(ev.Graphics);
            while (count < linesPerPage && ((line = sr.ReadLine()) != null))
            {
                yPos = topMargin   (count * printFont.GetHeight(ev.Graphics));
                ev.Graphics.DrawString(line, printFont, Brushes.Black,
                   leftMargin, yPos, new StringFormat());
                count  ;
            }

            // If more lines exist, print another page.
            if (line != null)
                ev.HasMorePages = true;
            else
                ev.HasMorePages = false;
        }

        private void button1_Click(object sender, EventArgs e)
        {
            StringBuilder sb = new StringBuilder();
            sb.Append("     农资管理系统  \n");
            sb.Append("*************************************\n");
            sb.Append("商品："   DateTime.Now.ToString()   "\n");
            sb.Append("客户："   DateTime.Now.ToString()   "\n");
            sb.Append("数量："   DateTime.Now.ToString()   "\n");
            sb.Append("金额："   DateTime.Now.ToString()   "\n");
            sb.Append("应收："   DateTime.Now.ToString()   "\n");
            sb.Append("实收："   DateTime.Now.ToString()   "\n");
            sb.Append("时间："   DateTime.Now.ToString()   "\n");
            sb.Append("*************************************\n");

            Print(sb.ToString());
        }
    }
}