// A delegate type for hooking up change notifications.
public delegate void ProgressChangingEventHandler(object sender, string e);
/// <summary>
/// Author:ESMAEEL ZENDEHDEL zendehdell@yahoo.com
/// DATE: 88/11/17
/// Description: A Class For Exporting Image From PDF Files
/// License : Free For All
/// //Acrobat com
/// </summary>
class PDFConvertor
{
public int pageCount = 0;
Acrobat.CAcroPDDoc pdfDoc = new Acrobat.AcroPDDoc();
Acrobat.CAcroPDPage pdfPage = null;
Acrobat.CAcroRect pdfRect = new Acrobat.AcroRect();
Acrobat.AcroPoint pdfPoint =new Acrobat.AcroPoint();
public event ProgressChangingEventHandler ExportProgressChanging;
protected virtual void OnExportProgressChanging(string e)
{
Thread.SpinWait(100);
if (ExportProgressChanging != null)
ExportProgressChanging(this, e);
}
#region Convert
/// <summary>
/// Converting PDF Files TO Specified Image Format
/// </summary>
/// <param name="sourceFileName">Source PDF File Path</param>
/// <param name="DestinationPath">Destination PDF File Path</param>
/// <param name="outPutImageFormat">Type Of Exported Image</param>
/// <returns>Returns Count Of Exported Images</returns>
public int Convert(string sourceFileName, string DestinationPath, ImageFormat outPutImageFormat)
{
if (pdfDoc.Open(sourceFileName))
{
// pdfapp.Hide();
pageCount = pdfDoc.GetNumPages();
for (int i = 0; i < pageCount; i++)
{
pdfPage = (Acrobat.CAcroPDPage)pdfDoc.AcquirePage(i);
pdfPoint = (Acrobat.AcroPoint)pdfPage.GetSize();
pdfRect.Left = 0;
pdfRect.right = pdfPoint.x;
pdfRect.Top = 0;
pdfRect.bottom = pdfPoint.y;
pdfPage.CopyToClipboard(pdfRect, 0, 0, 100);
string outimg = "";
string filename=sourceFileName.Substring(sourceFileName.LastIndexOf("\\"));
if (pageCount == 1)
outimg = DestinationPath + "\\" + filename + "." + outPutImageFormat.ToString();
else
outimg = DestinationPath + "\\" + filename + "_" + i.ToString() + "." + outPutImageFormat.ToString();
Clipboard.GetImage().Save(outimg, outPutImageFormat);
////////////Firing Progress Event
OnExportProgressChanging(outimg);
}
Dispose();
}
else
{
Dispose();
throw new System.IO.FileNotFoundException(sourceFileName +" Not Found!");
}
return pageCount;
}
#endregion
#region Convert With Zoom
/// <summary>
/// Converting PDF Files TO Specified Image Format
/// </summary>
/// <param name="sourceFileName">Source PDF File Path</param>
/// <param name="DestinationPath">Destination PDF File Path</param>
/// <param name="outPutImageFormat">Type Of Exported Image</param>
/// <param name="width">Width Of Exported Images</param>
/// <param name="height">Heiht Of Exported Images</param>
/// <param name="zoom">Zoom Percent</param>
/// <returns>Returns Count Of Exported Images</returns>
public int Convert(string sourceFileName, string DestinationPath, ImageFormat outPutImageFormat, short width, short height, short zoom)
{
if (pdfDoc.Open(sourceFileName))
{
// pdfapp.Hide();
pageCount = pdfDoc.GetNumPages();
for (int i = 0; i < pageCount; i++)
{
pdfPage = (Acrobat.CAcroPDPage)pdfDoc.AcquirePage(i);
// pdfPoint = (Acrobat.CAcroPoint)pdfPage.GetSize();
pdfRect.Left = 0;
pdfRect.right = width; //pdfPoint.x;
pdfRect.Top = 0;
pdfRect.bottom = height; //pdfPoint.y;
pdfPage.CopyToClipboard(pdfRect, 0, 0, zoom);
string outimg = "";
string filename = sourceFileName.Substring(sourceFileName.LastIndexOf("\\"));
if (pageCount == 1)
outimg = DestinationPath + "\\" + filename + "." + outPutImageFormat.ToString();
else
outimg = DestinationPath + "\\" + filename + "_" + i.ToString() + "." + outPutImageFormat.ToString();
Clipboard.GetImage().Save(outimg, outPutImageFormat);
////////////Firing Progress Event
OnExportProgressChanging(outimg);
}
Dispose();
}
else
{
Dispose();
throw new System.IO.IOException("Specified File Not Found!");
}
return pageCount;
}
#endregion
#region Destractor
~PDFConvertor()
{
GC.Collect();
if (pdfPage!=null)
Marshal.ReleaseComObject(pdfPage);
Marshal.ReleaseComObject(pdfPoint);
Marshal.ReleaseComObject(pdfRect);
Marshal.ReleaseComObject(pdfDoc);
}
public void Dispose()
{
GC.Collect();
if (pdfPage != null)
Marshal.ReleaseComObject(pdfPage);
Marshal.ReleaseComObject(pdfPoint);
Marshal.ReleaseComObject(pdfRect);
Marshal.ReleaseComObject(pdfDoc);
}
#endregion
}
/// <summary>
///
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void btnConvert_Click(object sender, EventArgs e)
{
ImageFormat imageFormat = new ImageFormat(Guid.Empty);
switch (comboBox1.SelectedItem.ToString() )
{
case "Jpeg": imageFormat = ImageFormat.Jpeg; break;
case "Bmp": imageFormat = ImageFormat.Bmp; break;
case "Png": imageFormat = ImageFormat.Png; break;
case "Gif": imageFormat = ImageFormat.Gif; break;
}
pdf = new PDFConvertor();
pdf.ExportProgressChanging += new ProgressChangingEventHandler(p_ExportProgressChanging);
progressBar1.Visible = true;
int filescount= pdf.Convert(txtInput.Text, txtOutPut.Text, imageFormat);
progressBar1.Visible = false ;
progressBar1.Value = 0;
this.Text = filescount + " Items Exported!";
lblCurrentFileName.Text = "";
System.Diagnostics.Process.Start(txtOutPut.Text);
}
/// <summary>
///
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
void p_ExportProgressChanging(object sender, string e)
{
lblCurrentFileName.Text = " Extracting " + e.Substring(e.LastIndexOf("\\")) + " !";
progressBar1.Maximum = pdf.pageCount;
progressBar1.Value += 1;
this.Text=lblCount.Text =string.Format("{0}/{1} Extracted!",progressBar1.Value,progressBar1.Maximum);
lblCount.Update();
lblCurrentFileName.Update();
}
pdf = new PDFConvertor();
imageFormat = ImageFormat.Jpeg;
inputfile = Server.MapPath("pdffile/Top1000WorldBanks2014.pdf");
outpubfile = Server.MapPath("exportimage");
//WEB不可以
// int filescount = pdf.Convert(inputfile, outpubfile, imageFormat);
DateTime startTime = DateTime.Now;
// string inputFile = files[n].ToString();
string outputFile = outpubfile + inputfile.Substring(inputfile.LastIndexOf(@"\") + 1).Replace(".pdf", ".png");
pdfDoc = (Acrobat.CAcroPDDoc)Microsoft.VisualBasic.Interaction.CreateObject("AcroExch.PDDoc", "");
bool ret = pdfDoc.Open(inputfile);
if (!ret)
{
throw new FileNotFoundException();
}
// Get the number of pages (to be used later if you wanted to store that information)
int pageCount = pdfDoc.GetNumPages();
// Get the first page
pdfPage = (Acrobat.CAcroPDPage)pdfDoc.AcquirePage(0);
pdfPoint = (Acrobat.CAcroPoint)pdfPage.GetSize();
pdfRect = (Acrobat.CAcroRect)Microsoft.VisualBasic.Interaction.CreateObject("AcroExch.Rect", "");
pdfRect.Left = 0;
pdfRect.right = pdfPoint.x;
pdfRect.Top = 0;
pdfRect.bottom = pdfPoint.y;
int numPages = pdfDoc.GetNumPages();
//System.Web.HttpContext.Current.Response.Write("numPages: " + numPages);
//System.Web.HttpContext.Current.Response.Write("Size: " + pdfPoint.x + "x" + pdfPoint.y);
double ratio = (double)pdfPoint.x / (double)pdfPoint.y;
// 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
// see http://www.adobe.com/support/techdocs/1dd72.htm
bool copyToClipBoardSuccess = pdfPage.CopyToClipboard(pdfRect, 0, 0, 100);
IDataObject clipboardData = Clipboard.GetDataObject();
Response.Write("copyToClipBoardSuccess: " + copyToClipBoardSuccess + ", Clipboard.ContainsImage: " + Clipboard.ContainsImage() + ", Clipboard.ContainsData: " + Clipboard.ContainsData(DataFormats.Bitmap));
//if (clipboardData.GetDataPresent(DataFormats.Bitmap))
//{
// Bitmap pdfBitmap = (Bitmap)clipboardData.GetData(DataFormats.Bitmap);
// // Size of generated thumbnail in pixels
// int biggestSize = 500;
// int thumbnailWidth = 0;
// int thumbnailHeight = 0;
// if (pdfPoint.x >= pdfPoint.y)
// {
// thumbnailWidth = biggestSize;
// thumbnailHeight = Convert.ToInt32((double)thumbnailWidth * ratio);
// }
// else
// {
// thumbnailHeight = biggestSize;
// thumbnailWidth = Convert.ToInt32((double)thumbnailHeight * ratio);
// }
// // Render to small image using the bitmap class
// System.Drawing.Image pdfImage = pdfBitmap.GetThumbnailImage(thumbnailWidth, thumbnailHeight, null, IntPtr.Zero);
// // Create new blank bitmap
// Bitmap thumbnailBitmap = new Bitmap(thumbnailWidth, thumbnailHeight, System.Drawing.Imaging.PixelFormat.Format32bppArgb);
// using (Graphics thumbnailGraphics = Graphics.FromImage(thumbnailBitmap))
// {
// // Draw rendered pdf image to new blank bitmap
// thumbnailGraphics.DrawImage(pdfImage, 2, 2, thumbnailWidth, thumbnailHeight);
// // Save as .png file
// thumbnailBitmap.Save(outputFile, System.Drawing.Imaging.ImageFormat.Png);
// //System.Web.HttpContext.Current.Response.Write("Generated thumbnail... " + outputFile);
// }
// pdfDoc.Close();
// // Not sure how why it is to do this, but Acrobat is not the best behaved COM object
// // see http://blogs.msdn.com/yvesdolc/archive/2004/04/17/115379.aspx
// Marshal.ReleaseComObject(pdfPage);
// Marshal.ReleaseComObject(pdfRect);
// Marshal.ReleaseComObject(pdfDoc);
// TimeSpan ts = new TimeSpan(DateTime.Now.Ticks - startTime.Ticks);
// //System.Web.HttpContext.Current.Response.Write("Parsning tog: " + ts.TotalMilliseconds + " ms");
// //System.Web.HttpContext.Current.Response.Write("");
//}
from: https://www.codeproject.com/articles/57100/simple-and-free-pdf-to-image-conversion
来源：oschina
链接：https://my.oschina.net/u/4368132/blog/4322145