/// <summary>
/// 核心代码是从网上找的，但是那些代码是运行于winform环境下的剪切板，要在WPF下，需要改进，已经改进完毕
/// </summary>
/// <param name="pageIndex"></param>
/// <param name="action"></param>
private void UsingImage(int pageIndex, Action <Bitmap> action)
{
var page = (CAcroPDPage)_document.AcquirePage(pageIndex);
try
{
var point = (CAcroPoint)page.GetSize();
//WPF下，需要转换逻辑像素到物理像素
//double resolution = SystemScreen.DPI.ScalingY; //设置图片的分辨率，数字越大越清晰，默认值为1
double resolution = 1.5;
int imgWidth = (int)((double)point.x * resolution);
int imgHeight = (int)((double)point.y * resolution);
_rect.Left = 0;
_rect.right = (short)imgWidth;
_rect.Top = 0;
_rect.bottom = (short)imgHeight;
using (MemoryStream ms = GetStream(page, resolution))
{
using (var image = new Bitmap(ms))
{
action(image);
}
}
}
catch (Exception ex)
{
throw ex;
}
finally
{
if (page != null)
{
Marshal.ReleaseComObject(page);
}
}
}
private Bitmap pdfPageToBitmap(int pageNumber)
{
var pdfPage = (CAcroPDPage)_pdfDoc.AcquirePage(pageNumber);
if (pdfPage == null)
{
throw new InvalidOperationException(BadFileErrorMessage);
}
var pdfPoint = (CAcroPoint)pdfPage.GetSize();
_pdfRect.Left = 0;
_pdfRect.right = pdfPoint.x;
_pdfRect.Top = 0;
_pdfRect.bottom = pdfPoint.y;
pdfPage.CopyToClipboard(_pdfRect, 0, 0, 100);
Bitmap pdfBitmap = null;
var thread = new Thread(() =>
{
var data = Clipboard.GetDataObject();
if (data != null && data.GetDataPresent(DataFormats.Bitmap))
{
pdfBitmap = (Bitmap)data.GetData(DataFormats.Bitmap);
}
});
thread.SetApartmentState(ApartmentState.STA);
thread.Start();
thread.Join();
Marshal.ReleaseComObject(pdfPage);
return(pdfBitmap);
}
//http://www.myexception.cn/c-sharp/1506415.html
//http://www.aspose.com/docs/display/pdfnet/Generate+Thumbnail+Images+from+PDF+Documents
public static void ConvertPDF2Image(string pdfInputPath, string imageOutputPath,
string imageName, int startPageNum, int endPageNum, ImageFormat imageFormat, double resolution)
{
CAcroPDDoc pdfDoc = null;
CAcroPDPage pdfPage = null;
CAcroRect pdfRect = null;
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 = (CAcroPDDoc)Microsoft.VisualBasic.Interaction.CreateObject("AcroExch.PDDoc", "");
// validate parameter
if (!pdfDoc.Open(pdfInputPath))
{
throw new 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 = (CAcroPDPage)pdfDoc.AcquirePage(i - 1);
pdfPoint = (CAcroPoint)pdfPage.GetSize();
pdfRect = (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 != null && clipboardData.GetDataPresent(DataFormats.Bitmap))
{
string _dir = Path.Combine(imageOutputPath, imageName);
string _path = _dir + "_" + i.ToString() + ".jpg";
if (File.Exists(_path))
{
File.Delete(_path);
}
Bitmap pdfBitmap = (Bitmap)clipboardData.GetData(DataFormats.Bitmap);
pdfBitmap.Save(_path, imageFormat);
pdfBitmap.Dispose();
}
}
pdfDoc.Close();
Marshal.ReleaseComObject(pdfPage);
Marshal.ReleaseComObject(pdfRect);
Marshal.ReleaseComObject(pdfDoc);
Marshal.ReleaseComObject(pdfPoint);
}
public String getPageRangeBetweenStrings(String szPdfPathConst, String HeaderStr, String FooterStr, Boolean includeFirstPageInRange, Boolean includeLastPageInRange)
{
CAcroApp avApp;
CAcroAVDoc avDoc;
CAcroAVPageView avPage;
avApp = new AcroAppClass();
avDoc = new AcroAVDocClass();
avDoc.Open(szPdfPathConst, "");
CAcroPDDoc pdDoc = (CAcroPDDoc)avDoc.GetPDDoc();
List <int> PageListHeader = new List <int>();
List <int> PageListFooter = new List <int>();
//AcroPDDoc pdDoc = getPDDoc(szPdfPathConst);
int TotalNumberOfPages = pdDoc.GetNumPages();
AcroPDPage page;
//set AVPage View object
avPage = (CAcroAVPageView)avDoc.GetAVPageView();
avApp.Show();
for (int i = 0; i < TotalNumberOfPages; i++)
{
page = (AcroPDPage)pdDoc.AcquirePage(i);
Boolean TextCheck = avDoc.FindText(HeaderStr, 1, 1, 0);
if (TextCheck == true)
{
int PageNum = avPage.GetPageNum();
PageListHeader.Add(PageNum);
}
}
List <int> PagesWithHeaderWords = DeDuplicateArray(PageListHeader);
for (int i = 0; i < TotalNumberOfPages; i++)
{
page = (AcroPDPage)pdDoc.AcquirePage(i);
Boolean TextCheck = avDoc.FindText(FooterStr, 1, 1, 0);
if (TextCheck == true)
{
int PageNum = avPage.GetPageNum();
PageListFooter.Add(PageNum);
}
}
List <int> PagesWithFooterWords = DeDuplicateArray(PageListFooter);
int MinimumFooterRange = 0;
int MinimumHeaderRange = 0;
if (PagesWithFooterWords.Count == 0 || PagesWithHeaderWords.Count == 0)
{
return("No Range Found");
}
MinimumFooterRange = PagesWithFooterWords.Min();
MinimumHeaderRange = PagesWithFooterWords.Min();
int HeaderFinalPageNumber = MinimumHeaderRange + 1;
int FooterFinalPageNumber = MinimumFooterRange + 1;
if (!includeFirstPageInRange)
{
HeaderFinalPageNumber++;
}
if (!includeLastPageInRange)
{
FooterFinalPageNumber--;
}
return(HeaderFinalPageNumber + "-" + FooterFinalPageNumber);
}