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主题:C#实现PDF转图片

首先就是利用word本身自带的转为pdf格式的文件,再通过Adobe官方Acrobat提供的接口实现该功能。

以下就是北京上课了提供的一种方式,代码如下:

/// <summary>
/// 将PDF文档转换为图片的方法,你可以像这样调用该方法:ConvertPDF2Image("F:\\A.pdf", "F:\\", "A", 0, 0, null, 0);
/// 因为大多数的参数都有默认值,startPageNum默认值为1,endPageNum默认值为总页数,
/// imageFormat默认值为ImageFormat.Jpeg,resolution默认值为1
/// </summary>
/// <param name="pdfInputPath">PDF文件路径</param>
/// <param name="imageOutputPath">图片输出路径</param>
/// <param name="imageName">图片的名字,不需要带扩展名</param>
/// <param name="startPageNum">从PDF文档的第几页开始转换,默认值为1</param>
/// <param name="endPageNum">从PDF文档的第几页开始停止转换,默认值为PDF总页数</param>
/// <param name="imageFormat">设置所需图片格式</param>
/// <param name="resolution">设置图片的分辨率,数字越大越清晰,默认值为1</param>
publicstaticvoid ConvertPDF2Image(string pdfInputPath, string imageOutputPath,
string imageName, int startPageNum, int endPageNum, ImageFormat imageFormat, double resolution)
{
Acrobat.CAcroPDDoc pdfDoc = null;
Acrobat.CAcroPDPage pdfPage = null;
Acrobat.CAcroRect pdfRect = null;
Acrobat.CAcroPoint pdfPoint = null;
 
// Create the document (Can only create the AcroExch.PDDoc object using late-binding)
// Note using VisualBasic helper functions, have to add reference to DLL
pdfDoc = (Acrobat.CAcroPDDoc)Microsoft.VisualBasic.Interaction.CreateObject("AcroExch.PDDoc", "");
 
// validate parameter
if (!pdfDoc.Open(pdfInputPath)) { thrownew FileNotFoundException(); }
if (!Directory.Exists(imageOutputPath)) { Directory.CreateDirectory(imageOutputPath); }
if (startPageNum <= 0) { startPageNum = 1; } if (endPageNum > pdfDoc.GetNumPages() || endPageNum <= 0) { endPageNum = pdfDoc.GetNumPages(); } if (startPageNum > endPageNum) { int tempPageNum = startPageNum; startPageNum = endPageNum; endPageNum = startPageNum; }
if (imageFormat == null) { imageFormat = ImageFormat.Jpeg; }
if (resolution <= 0) { resolution = 1; }
 
// start to convert each page
for (int i = startPageNum; i <= endPageNum; i++)
{
pdfPage = (Acrobat.CAcroPDPage)pdfDoc.AcquirePage(i - 1);
pdfPoint = (Acrobat.CAcroPoint)pdfPage.GetSize();
pdfRect = (Acrobat.CAcroRect)Microsoft.VisualBasic.Interaction.CreateObject("AcroExch.Rect", "");
 
int imgWidth = (int)((double)pdfPoint.x * resolution);
int imgHeight = (int)((double)pdfPoint.y * resolution);
 
pdfRect.Left = 0;
pdfRect.right = (short)imgWidth;
pdfRect.Top = 0;
pdfRect.bottom = (short)imgHeight;
 
// Render to clipboard, scaled by 100 percent (ie. original size)
// Even though we want a smaller image, better for us to scale in .NET
// than Acrobat as it would greek out small text
pdfPage.CopyToClipboard(pdfRect, 0, 0, (short)(100 * resolution));
 
IDataObject clipboardData = Clipboard.GetDataObject();
 
if (clipboardData.GetDataPresent(DataFormats.Bitmap))
{
Bitmap pdfBitmap = (Bitmap)clipboardData.GetData(DataFormats.Bitmap);
pdfBitmap.Save(Path.Combine(imageOutputPath, imageName) + ".jpg", imageFormat);
pdfBitmap.Dispose();
}
}
 
pdfDoc.Close();
Marshal.ReleaseComObject(pdfPage);
Marshal.ReleaseComObject(pdfRect);
Marshal.ReleaseComObject(pdfDoc);
Marshal.ReleaseComObject(pdfPoint);
}

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