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public IActionResult Download([FromBody] Dictionary<string, string> jsonObject)
{
//Initialize the PDF Viewer
object with memory cache object
PdfRenderer pdfviewer = new PdfRenderer(_cache);
string documentBase = pdfviewer.GetDocumentAsBase64(jsonObject);
string base64Data = documentBase.Split("base64,")[1];
byte[] document1 = Convert.FromBase64String(base64Data);
PdfLoadedDocument ldoc = new PdfLoadedDocument(document1);
FileStream fontStream = new FileStream(GetDocumentPath("SIMSUN.ttf"), FileMode.Open);
for (int i = 0; i < ldoc.Pages.Count; i++)
{
PdfLoadedPage
lpage
= ldoc.Pages[i] as PdfLoadedPage;
for (int j = 0; j < lpage.Annotations.Count; j++)
{
PdfLoadedFreeTextAnnotation
lAnnot
= lpage.Annotations[j] as PdfLoadedFreeTextAnnotation;
if (lAnnot != null)
{
if (IsChineseCharacter(lAnnot.MarkUpText))
{
lAnnot.Font = new PdfTrueTypeFont(fontStream, lAnnot.Font.Size);
lAnnot.ComplexScript = true;
lAnnot.SetAppearance(true);
}
}
}
}
MemoryStream stream = new MemoryStream();
ldoc.Save(stream);
string base64string = Convert.ToBase64String((stream as MemoryStream).ToArray());
ldoc.EnableMemoryOptimization = true;
ldoc.Close(true);
ldoc.EnableMemoryOptimization = true;
ldoc.Close(true);
stream.Dispose();
return Content("data:application/pdf;base64," + base64string);
}
public static bool IsChineseCharacter(string input)
{
foreach (char c in input)
{
if (c >= '\u4e00' && c <= '\u9fff')
{
return true;
}
}
return false;
}
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