134 lines
4.7 KiB
C#
134 lines
4.7 KiB
C#
using iTextSharp.text.pdf;
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using iTextSharp.text;
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using System;
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using System.Collections.Generic;
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using System.Drawing;
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using System.Drawing.Imaging;
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using System.IO;
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using System.Linq;
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using System.Text;
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using System.Threading.Tasks;
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using System.Net.Http;
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using System.Net;
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namespace 心电图绘制
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{
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internal class UniversalFun
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{
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/// <summary>
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/// base64转换成图片
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/// </summary>
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/// <param name="base64String"></param>
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/// <returns></returns>
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public static System.Drawing.Image ConvertFromBase64String(string base64String)
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{
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string [] baseary= base64String.Split(',');
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if(baseary.Length<2)
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{
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return null;
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}
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// 将Base64字符串转换为字节数组
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byte[] imageBytes = Convert.FromBase64String(baseary[1]);
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// 使用字节数组创建MemoryStream
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using (MemoryStream ms = new MemoryStream(imageBytes))
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{
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// 从MemoryStream中创建Image对象
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System.Drawing.Image image = System.Drawing.Image.FromStream(ms);
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return image;
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}
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}
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/// <summary>
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/// 图片转换成base64
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/// </summary>
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/// <param name="bitmap"></param>
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/// <param name="format"></param>
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/// <returns></returns>
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public static string ConvertToBase64String(Bitmap bitmap, ImageFormat format)
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{
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// 将Bitmap保存到MemoryStream中
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using (MemoryStream ms = new MemoryStream())
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{
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bitmap.Save(ms, format); // 可以根据需要选择不同的图片格式，例如ImageFormat.Png或ImageFormat.Jpeg
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// 将流的位置重置到开始位置
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ms.Position = 0;
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// 将MemoryStream中的字节数组编码为Base64字符串
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byte[] imageBytes = ms.ToArray();
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string base64String = Convert.ToBase64String(imageBytes);
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return base64String;
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}
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}
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/// <summary>
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/// 图片转换成PDF
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/// </summary>
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/// <param name="bitmap"></param>
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/// <param name="pdfPath"></param>
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public static void ConvertBitmapToPdf(Bitmap bitmap, string pdfPath)
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{
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string directoryPath = Path.GetDirectoryName(pdfPath);
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if (directoryPath != null && !Directory.Exists(directoryPath))
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{
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Directory.CreateDirectory(directoryPath);
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}
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// 创建一个文档对象
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Document document = new Document();
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// 创建一个PdfWriter实例
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PdfWriter writer = PdfWriter.GetInstance(document, new FileStream(pdfPath, FileMode.Create));
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// 打开文档以便添加内容
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document.Open();
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// 设置页面尺寸与图像尺寸一致
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iTextSharp.text.Rectangle pageSize = new iTextSharp.text.Rectangle(bitmap.Width, bitmap.Height+50);
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document.SetPageSize(pageSize);
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// 将Bitmap转换为iTextSharp的Image对象
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iTextSharp.text.Image image = ConvertBitmapToImageSharp(bitmap);
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// 将图像添加到文档
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document.NewPage();
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document.Add(image);
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// 关闭文档
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document.Close();
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}
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private static iTextSharp.text.Image ConvertBitmapToImageSharp(Bitmap bitmap)
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{
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using (MemoryStream ms = new MemoryStream())
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{
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// 将Bitmap保存到MemoryStream中，使用PNG格式
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bitmap.Save(ms, ImageFormat.Png);
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// 从MemoryStream中创建iTextSharp的Image对象
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return iTextSharp.text.Image.GetInstance(new MemoryStream(ms.ToArray()));
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}
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}
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/// <summary>
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/// 获取指定 URL 的文本文件内容
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/// </summary>
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/// <param name="url">文本文件的 URL</param>
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/// <returns>返回文件内容的字符串，如果失败则返回 null</returns>
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public static string GetTextFileContent(string url)
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{
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// 忽略 SSL 证书错误
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ServicePointManager.ServerCertificateValidationCallback = (sender, certificate, chain, sslPolicyErrors) => true;
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using (WebClient client = new WebClient())
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{
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try
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{
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// 下载文件内容
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return client.DownloadString(url);
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}
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catch (WebException e)
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{
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Console.WriteLine("请求错误: " + e.Message);
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return null;
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}
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}
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}
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}
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}
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