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PDFium.Net User  
#1 Posted : Wednesday, September 19, 2018 8:07:01 AM(UTC)
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Hello,

we're using the PDFViewer in our Application, we buied a Site License.

If I print a Document via Patagames.Pdf.Net.Controls.WinForms.PdfPrintDocument,
it's rendered a Bitmap.

If we print to a Virtual Printer like "Microsoft XPS Document Writer",
the text is also rendered as Image.

I've looked over the PDFfium DLL and I think it's possible to print as EMF instead
as Bitmap. It will also have a great effect of minimizing the print document size.

E.g we use third party tools, where we print the document in a printcontroller and add it
to another document, and it remains as vector.

Could you check if's possible to take this changes.

Regards, B.Bücher
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Paul Rayman  
#2 Posted : Wednesday, September 19, 2018 8:23:15 AM(UTC)
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Hi,
I do not have the slightest idea how this can be done.
We render the PDF directly into the printer Device Context and it does not seems that this can be done as a vector.

Could you please point me the right direction, where and what did you look in Pdfium.dll
This is very interesting functionality and we could explore it.
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PDFium.Net User  
#3 Posted : Wednesday, October 3, 2018 10:49:03 AM(UTC)
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Hello,

sorry for my late answer.

The forum didn't inform me, that there's a reply.

I asked because I'd found an article on stackoverflow.com: Article on Stackoverflow.

There they posted the following sample code:

Code:
void WriteEmf(FPDF_PAGE page, const char* pdf_name, int num) {
  int width = static_cast<int>(FPDF_GetPageWidth(page));
  int height = static_cast<int>(FPDF_GetPageHeight(page));

  char filename[256];
  snprintf(filename, sizeof(filename), "%s.%d.emf", pdf_name, num);

  HDC dc = CreateEnhMetaFileA(nullptr, filename, nullptr, nullptr);

  HRGN rgn = CreateRectRgn(0, 0, width, height);
  SelectClipRgn(dc, rgn);
  DeleteObject(rgn);

  SelectObject(dc, GetStockObject(NULL_PEN));
  SelectObject(dc, GetStockObject(WHITE_BRUSH));
  // If a PS_NULL pen is used, the dimensions of the rectangle are 1 pixel less.
  Rectangle(dc, 0, 0, width + 1, height + 1);

  FPDF_RenderPage(dc, page, 0, 0, width, height, 0,
                  FPDF_ANNOT | FPDF_PRINTING | FPDF_NO_CATCH);

  DeleteEnhMetaFile(CloseEnhMetaFile(dc));
}


This sample refers to the sample on googlesource: Sample on Googlesource

So i think it's possible to export as emf.
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Paul Rayman  
#4 Posted : Wednesday, October 3, 2018 4:54:35 PM(UTC)
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Well ... The PdfPrintdocument does exactly the same thing. It renders to device context (dc) directly as in your example. For one exception, in your example dc is obtained by the CreateMetaFile function, but PdfPrintDocument get it from the target printer.

You can easily reproduce the code you provided in .Net

Code:
[DllImport(@"gdi32.dll", EntryPoint = "CreateEnhMetaFileA", SetLastError = true)]
private static extern IntPtr CreateEnhMetaFileA(IntPtr hdc, [MarshalAs(UnmanagedType.LPStr)]string file, IntPtr rect, IntPtr desc);

[DllImport(@"gdi32.dll", EntryPoint = "CloseEnhMetaFile", SetLastError = true)]
private static extern IntPtr CloseEnhMetaFile(IntPtr hdc);

[DllImport(@"gdi32.dll", EntryPoint = "DeleteEnhMetaFile", SetLastError = true)]
private static extern bool DeleteEnhMetaFile(IntPtr hMetaFile);


Code:
using (var doc = PdfDocument.Load(@"d:\0\1\review.pdf"))
{
    var page = doc.Pages[0];
    int width = (int)page.Width;
    int height = (int)page.Height;


    IntPtr hdc = CreateEnhMetaFileA(IntPtr.Zero, @"d:\9\test.emf", IntPtr.Zero, IntPtr.Zero);

    using (var g = System.Drawing.Graphics.FromHdc(hdc))
    {
        g.SetClip(new Rectangle(0, 0, width, height));
        g.FillRectangle(Brushes.White, 0, 0, width, height);
        page.Render(hdc, 0, 0, width, height, PageRotate.Normal, RenderFlags.FPDF_PRINTING | RenderFlags.FPDF_ANNOT | RenderFlags.FPDF_NO_CATCH);
    }

    DeleteEnhMetaFile(CloseEnhMetaFile(hdc));
}
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