C#使用PdfiumViewer库处理PDF文件的实践方法

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dotnet add package PdfiumViewer

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dotnet add package PdfiumViewer.Native.x64

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usingPdfiumViewer;

using(var document = PdfDocument.Load("sample.pdf"))

{

intpageCount = document.PageCount;

Console.WriteLine($"PDF 页数：{pageCount}");

}

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usingPdfiumViewer;

usingSystem.Drawing;

using(var document = PdfDocument.Load("sample.pdf"))

{

intpageIndex = 0;

// 300 DPI 高清渲染

var image = document.Render(

pageIndex,

300,

300,

PdfRenderFlags.Annotations

);

image.Save("page1.png", System.Drawing.Imaging.ImageFormat.Png);

}

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usingPdfiumViewer;

usingSystem.Drawing.Imaging;

voidConvertPdfToImages(stringpdfPath,stringoutputDir)

{

usingvar document = PdfDocument.Load(pdfPath);

Directory.CreateDirectory(outputDir);

for(inti = 0; i < document.PageCount; i++)

{

usingvar image = document.Render(i, 300, 300, PdfRenderFlags.Annotations);

stringpath = Path.Combine(outputDir, $"page_{i + 1}.jpg");

image.Save(path, ImageFormat.Jpeg);

}

}

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usingPdfiumViewer;

usingvar document = PdfDocument.Load("sample.pdf");

var size = document.PageSizes[0];

Console.WriteLine($"宽：{size.Width} pt");

Console.WriteLine($"高：{size.Height} pt");

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intdpi = 300;

intwidthPx = (int)(size.Width / 72 * dpi);

intheightPx = (int)(size.Height / 72 * dpi);

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usingPdfiumViewer;

usingvar document = PdfDocument.Load("sample.pdf");

stringtext = document.GetPdfText(0);

Console.WriteLine(text);

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usingPdfiumViewer;

PdfDocument document = PdfDocument.Load("sample.pdf");

pictureBox1.Image = document.Render(

0,

pictureBox1.Width,

pictureBox1.Height,

true

);

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usingPdfiumViewer;

usingSystem.Drawing;

usingvar document = PdfDocument.Load("sample.pdf");

var pageSize = document.PageSizes[0];

RectangleF crop =newRectangleF(

0,

0,

pageSize.Width / 2,

pageSize.Height / 2

);

usingvar image = document.Render(

0,

300,

300,

crop,

PdfRenderFlags.None

);

image.Save("crop.png");