/// <summary>
/// Get page count
/// </summary>
/// <param name="pdf">Pdf</param>
/// <returns>Page count</returns>
public int GetPageCount(byte[] pdf)
{
using (var stream = new MemoryStream(pdf))
{
using (var pdfInstance = GdPictureHelper.GetPDFInstance())
{
pdfInstance.LoadFromStream(stream);
var count = pdfInstance.GetPageCount();
pdfInstance?.CloseDocument();
return(count);
}
}
}
/// <summary>
/// Split pdf by page range
/// </summary>
/// <param name="pdf">Pdf to split</param>
/// <param name="ranges">List of page ranges</param>
/// <returns>List of splitted pdfs</returns>
public IList <PdfSplitResult> Split(byte[] pdf, IList <PageNumberRange> ranges)
{
var result = new List <PdfSplitResult>();
using (var stream = new MemoryStream(pdf))
{
using (var pdfInstance = GdPictureHelper.GetPDFInstance())
{
pdfInstance.LoadFromStream(stream);
if (ranges == null || ranges.Count == 0)
{
return new List <PdfSplitResult> {
}
}
;
foreach (var range in ranges.Where(x => x.PageCount > 0 && x.StartPageNumber + (x.PageCount - 1) <= pdfInstance.GetPageCount()))
{
using (var newPdf = GdPictureHelper.GetPDFInstance())
{
newPdf.NewPDF();
for (int i = 0; i < range.PageCount; i++)
{
newPdf.ClonePage(pdfInstance, range.StartPageNumber + i);
}
using (var targetStream = new MemoryStream())
{
newPdf.SaveToStream(targetStream);
targetStream.Position = 0;
result.Add(new PdfSplitResult
{
Pdf = targetStream.ToArray(),
PageCount = range.PageCount,
Barcode = range.Barcode,
BarcodeType = range.BarcodeType
});
}
}
}
}
}
return(result);
}
/// <summary>
/// Split pdf by page number
/// </summary>
/// <param name="pdf">Pdf to split</param>
/// <param name="ranges">List of page number</param>
/// <returns>Splitted pdfs</returns>
public PdfSplitResult SplitByPageNumbers(byte[] pdf, IList <int> pageNumbers)
{
var result = new PdfSplitResult();
using (var stream = new MemoryStream(pdf))
{
using (var pdfInstance = GdPictureHelper.GetPDFInstance())
{
pdfInstance.LoadFromStream(stream);
if (pageNumbers == null || pageNumbers.Count == 0)
{
return new PdfSplitResult {
Pdf = pdf, PageCount = pdfInstance.GetPageCount()
}
}
;
using (var newPdf = GdPictureHelper.GetPDFInstance())
{
newPdf.NewPDF();
foreach (var page in pageNumbers)
{
newPdf.ClonePage(pdfInstance, page);
}
using (var targetStream = new MemoryStream())
{
newPdf.SaveToStream(targetStream);
targetStream.Position = 0;
result = new PdfSplitResult {
Pdf = targetStream.ToArray(), PageCount = pageNumbers.Count
};
}
}
}
}
return(result);
}
}
/// <summary>
/// Adds a text annotation
/// </summary>
/// <param name="pdf">Pdf</param>
/// <param name="pageNumber">Page number on which the annotation will be placed</param>
/// <param name="annotation">The annotation which will be added</param>
/// <returns>The modified Pdf-blob</returns>
public byte[] AddTextAnnotation(byte[] pdf, int pageNumber, PdfAnnotation annotation)
{
using (var stream = new MemoryStream(pdf))
{
using (var pdfInstance = GdPictureHelper.GetPDFInstance())
{
pdfInstance.LoadFromStream(stream);
pdfInstance.SelectPage(pageNumber);
pdfInstance.SetOrigin(PdfOrigin.PdfOriginTopLeft);
pdfInstance.SetMeasurementUnit(PdfMeasurementUnit.PdfMeasurementUnitMillimeter);
pdfInstance.AddFreeTextAnnotation(annotation.Left, annotation.Top + annotation.Height, annotation.Width, annotation.Height, annotation.HasBorder, "", "", annotation.Content, annotation.FontName, annotation.FontSize, annotation.FontColor.R, annotation.FontColor.G, annotation.FontColor.B, annotation.BackgroundColor.R, annotation.BackgroundColor.G, annotation.BackgroundColor.B, annotation.Opacity);
using (var targetStream = new MemoryStream())
{
pdfInstance.SaveToStream(targetStream);
targetStream.Position = 0;
pdfInstance?.CloseDocument();
return(targetStream.ToArray());
}
}
}
}
/// <summary>
/// Adds an empty page to the given pdf.
/// </summary>
/// <param name="pdf">Pdf</param>
/// <param name="pageNumber">Index of the new page, starting with 1 which will insert an empty page as the first page</param>
/// <returns>The resulting Pdf-blob</returns>
public byte[] AddEmptyPage(byte[] pdf, int pageNumber)
{
using (var stream = new MemoryStream(pdf))
{
using (var pdfInstance = GdPictureHelper.GetPDFInstance())
{
pdfInstance.LoadFromStream(stream);
pdfInstance.SelectPage(1);
float pageWidth = pdfInstance.GetPageWidth();
float pageHeight = pdfInstance.GetPageHeight();
pdfInstance.InsertPage(pageWidth, pageHeight, pageNumber);
using (var targetStream = new MemoryStream())
{
pdfInstance.SaveToStream(targetStream);
targetStream.Position = 0;
pdfInstance?.CloseDocument();
return(targetStream.ToArray());
}
}
}
}