.Net 对于PDF生成以及各种转换的操作
程序员文章站
2022-05-06 09:29:13
...
1、生成PDF
这里用到了 Spire.Pdf 这个类库可以在NuGet里面搜索到
public static void abc()
{
//创建PDF文档
Spire.Pdf.PdfDocument doc = new Spire.Pdf.PdfDocument();
//添加一页
PdfPageBase page = doc.Pages.Add();
//设置字体
PdfTrueTypeFont font = new PdfTrueTypeFont(new System.Drawing.Font("Microsoft Yahei", 20f), true);
PdfTrueTypeFont font1 = new PdfTrueTypeFont(new System.Drawing.Font("Microsoft Yahei", 11f), true);
//创建一个PdfGrid对象
PdfGrid grid = new PdfGrid();
//这一段的内容是在表格只玩显示一些数据 根据坐标定位 第一个是内容，第二个是字体，第三个是颜色，第四第五是坐标
page.Canvas.DrawString("XXXXXXXX管理中心回单",
font,
new PdfSolidBrush(System.Drawing.Color.Black), 130, 10);
page.Canvas.DrawString("编号：31231",
font1,
new PdfSolidBrush(System.Drawing.Color.Black), 380, 60);
page.Canvas.DrawString("经办人：XXXX",
font1,
new PdfSolidBrush(System.Drawing.Color.Black), 60, 250);
page.Canvas.DrawString("打印日期：2020/06/15",
font1,
new PdfSolidBrush(System.Drawing.Color.Black), 380, 250);
//设置单元格边距
grid.Style.CellPadding = new PdfPaddings(1, 1, 4, 4);
//设置表格默认字体
grid.Style.Font = new PdfTrueTypeFont(new System.Drawing.Font("Microsoft Yahei", 12f), true);
//添加4行4列
PdfGridRow row1 = grid.Rows.Add();
PdfGridRow row2 = grid.Rows.Add();
PdfGridRow row3 = grid.Rows.Add();
PdfGridRow row4 = grid.Rows.Add();
PdfGridRow row5 = grid.Rows.Add();
PdfGridRow row6 = grid.Rows.Add();
grid.Columns.Add(4);
//设置列宽
foreach (PdfGridColumn col in grid.Columns)
{
col.Width = 120f;
}
//写入数据 第一行第一个格式的值，第一行第二个格子的值
row1.Cells[0].Value = "收款单位";
row1.Cells[1].Value = "{DW}";
row2.Cells[0].Value = "收款单位";
row2.Cells[1].Value = "{DW}";
row3.Cells[0].Value = "汇款时间";
row3.Cells[1].Value = "2016/06/02";
row3.Cells[2].Value = "金额小写";
row3.Cells[3].Value = "￥231";
row4.Cells[0].Value = "金额合计大写";
row4.Cells[1].Value = "大苏打实打实";
row5.Cells[0].Value = "用途:" +
"付XXXX2020年04月至2020年04月";
row6.Cells[0].Value = "提示:回单可重复打印，请勿重复XXX";
//row5.Cells[0].Height = (float)20;
//水平和垂直合并单元格 从那个格子开始合并几个（包含当前格子）
row1.Cells[1].ColumnSpan = 3;
row2.Cells[1].ColumnSpan = 3;
row4.Cells[1].ColumnSpan = 3;
row5.Cells[0].ColumnSpan = 2;
row5.Cells[2].ColumnSpan = 2;
row6.Cells[0].ColumnSpan = 2;
row6.Cells[2].ColumnSpan = 2;
//这个是垂直合并，但是我之前合并的没有效果
row5.Cells[1].RowSpan = 2;
//设置单元格内文字对齐方式
row1.Cells[0].StringFormat = new PdfStringFormat(PdfTextAlignment.Center);
row1.Cells[1].StringFormat = new PdfStringFormat(PdfTextAlignment.Center);
row2.Cells[0].StringFormat = new PdfStringFormat(PdfTextAlignment.Center);
row2.Cells[1].StringFormat = new PdfStringFormat(PdfTextAlignment.Center);
row3.Cells[0].StringFormat = new PdfStringFormat(PdfTextAlignment.Center);
row3.Cells[1].StringFormat = new PdfStringFormat(PdfTextAlignment.Center);
row3.Cells[2].StringFormat = new PdfStringFormat(PdfTextAlignment.Center);
row3.Cells[3].StringFormat = new PdfStringFormat(PdfTextAlignment.Center);
row4.Cells[0].StringFormat = new PdfStringFormat(PdfTextAlignment.Center);
row4.Cells[1].StringFormat = new PdfStringFormat(PdfTextAlignment.Center);
row5.Cells[0].StringFormat = new PdfStringFormat(PdfTextAlignment.Center);
row6.Cells[0].StringFormat = new PdfStringFormat(PdfTextAlignment.Center);
//设置单元格背景颜色
//row1.Cells[0].Style.BackgroundBrush = PdfBrushes.Gray;
//row3.Cells[3].Style.BackgroundBrush = PdfBrushes.Green;
//row4.Cells[3].Style.BackgroundBrush = PdfBrushes.MediumVioletRed;
//设置边框颜色、粗细
PdfBorders borders = new PdfBorders();
borders.All = new PdfPen(System.Drawing.Color.Black, 0.1f);
foreach (PdfGridRow pgr in grid.Rows)
{
foreach (PdfGridCell pgc in pgr.Cells)
{
pgc.Style.Borders = borders;
}
}
//保存到文档
//在指定为绘入表格
grid.Draw(page, new PointF(30, 80));
doc.SaveToFile(@"路径");
//这句是在浏览器重打开这个PDF
System.Diagnostics.Process.Start(@"路径");
}
保存我们看一下
2、之后就是关于PDF一些转换的操作了（PDF转base64，转图片之类的，我把代码贴到下面）
- 这个用到了iTextSharp类库，也可以在Nuget下载到
/// <summary>
/// 图片转pdf
/// </summary>
/// <param name="jpgfile"></param>
/// <param name="pdf"></param>
public static bool ConvertJPG2PDF(string jpgfile, string pdf)
{
try
{
var document = new iTextSharp.text.Document(iTextSharp.text.PageSize.A4, 25, 25, 25, 25);
using (var stream = new FileStream(pdf, FileMode.Create, FileAccess.Write, FileShare.None))
{
PdfWriter.GetInstance(document, stream);
document.Open();
using (var imageStream = new FileStream(jpgfile, FileMode.Open, FileAccess.Read, FileShare.ReadWrite))
{
var image = iTextSharp.text.Image.GetInstance(imageStream);
if (image.Height > iTextSharp.text.PageSize.A4.Height - 25)
{
image.ScaleToFit(iTextSharp.text.PageSize.A4.Width - 25, iTextSharp.text.PageSize.A4.Height - 25);
}
else if (image.Width > iTextSharp.text.PageSize.A4.Width - 25)
{
image.ScaleToFit(iTextSharp.text.PageSize.A4.Width - 25, iTextSharp.text.PageSize.A4.Height - 25);
}
image.Alignment = iTextSharp.text.Image.ALIGN_MIDDLE;
document.NewPage();
document.Add(image);
}
document.Close();
}
return true;
}
catch (Exception ex)
{
throw ex;
}
}
- 这个用的是（O2S.Components.PDFRender4NET）
/// <summary>
/// pdf转img
/// </summary>
/// <param name="path">pdf位置</param>
/// <param name="path2">img位置</param>
public static void Pdf2Img(string path, string path2)
{
PDFFile pdfFile = PDFFile.Open(path);
//实例化一个PdfDocument类对象，并加载PDF文档
using (Spire.Pdf.PdfDocument doc = new Spire.Pdf.PdfDocument())
{
doc.LoadFromFile(path);
//调用方法SaveAsImage()将PDF第一页保存为Bmp格式
System.Drawing.Image bmp = doc.SaveAsImage(0);
// //调用另一个SaveAsImage()方法，并将指定页面保存保存为Emf、Png
System.Drawing.Image emf = doc.SaveAsImage(0, Spire.Pdf.Graphics.PdfImageType.Bitmap);
System.Drawing.Image zoomImg = new Bitmap((int)(emf.Size.Width * 2), (int)(emf.Size.Height * 2));
using (Graphics g = Graphics.FromImage(zoomImg))
{
g.ScaleTransform(2.0f, 2.0f);
g.DrawImage(emf, new System.Drawing.Rectangle(new System.Drawing.Point(0, 0), emf.Size), new System.Drawing.Rectangle(new System.Drawing.Point(0, 0), emf.Size), GraphicsUnit.Pixel);
zoomImg.Save(path2, ImageFormat.Jpeg);
zoomImg.Dispose();
emf.Dispose();
bmp.Dispose();
}
doc.Close();
doc.Dispose();
}
}
- 这个和上面用的也是同一个（我觉得这个比较好用一些）
/// <summary>
/// 将PDF文档转换为图片的方法
/// </summary>
/// <param name="pdfInputPath">PDF文件路径</param>
/// <param name="imageOutputPath">图片输出路径</param>
/// <param name="imageName">生成图片的名字</param>
/// <param name="startPageNum">从PDF文档的第几页开始转换</param>
/// <param name="endPageNum">从PDF文档的第几页开始停止转换</param>
/// <param name="imageFormat">设置所需图片格式</param>
/// <param name="definition">设置图片的清晰度，数字越大越清晰</param>
public static void ConvertPDF2Image(string pdfInputPath, string imageOutputPath,
string imageName, int startPageNum, int endPageNum, ImageFormat imageFormat, Definition definition)
{
PDFFile pdfFile = null;
FileStream fs = null;
try
{
fs = new FileStream(pdfInputPath, FileMode.OpenOrCreate, FileAccess.ReadWrite, FileShare.ReadWrite);
pdfFile = PDFFile.Open(fs);
if (startPageNum <= 0)
{
startPageNum = 1;
}
if (endPageNum > pdfFile.PageCount)
{
endPageNum = pdfFile.PageCount;
}
if (startPageNum > endPageNum)
{
int tempPageNum = startPageNum;
startPageNum = endPageNum;
endPageNum = startPageNum;
}
string path = imageOutputPath + imageName + "1" + "." + imageFormat.ToString();
Logger.WriteLogs("PDFIMG:" + path);
using (Bitmap pageImage = pdfFile.GetPageImage(0, 56 * (int)definition))
{
if (!File.Exists(path))
{
using (FileStream f = new FileStream(path, FileMode.OpenOrCreate, FileAccess.ReadWrite, FileShare.ReadWrite))
{
pageImage.Save(f, ImageFormat.Jpeg);
pageImage.Dispose();
}
}
}
fs.Flush();
}
catch (Exception ex)
{
throw new Exception(ex.Message);
}
finally
{
if (pdfFile != null)
{
pdfFile.Dispose();
}
else if (fs != null)
{
fs.Close();
fs.Dispose();
}
}
}
public enum Definition
{
One = 1, Two = 2, Three = 3, Four = 4, Five = 5, Six = 6, Seven = 7, Eight = 8, Nine = 9, Ten = 10
}
- PDF转Base64
-
/// <summary> /// pdf转base64 /// </summary> /// <param name="filePath"></param> /// <returns></returns> public static string PdfWord_To_Base64(string filePath) { try { if (!string.IsNullOrWhiteSpace(filePath.Trim())) { FileStream fileStream = new FileStream(filePath, FileMode.OpenOrCreate); byte[] bt = new byte[fileStream.Length]; fileStream.Read(bt, 0, bt.Length); fileStream.Close(); fileStream.Dispose(); return Convert.ToBase64String(bt); } else { return "请输入正确的路径"; } } catch (Exception ex) { throw ex; } }我主要也就用到这些，之后在发现，我在往上加
链接: https://pan.baidu.com/s/16xEpLBJ3-8fGjNPyvHUSmA
提取码: p9qi
这个是O2S.Components.PDFRender4NET的文件，我看评论里有问的，之前忘记发了，网上有的是收费的，Nuget里面带后缀的我没用过。
上一篇： ubuntu+yolo3+gtx1060复制别人的人数识别程序
下一篇： C语言大作业之班费管理系统