protected virtual void Dispose(bool disposing)
{
if (!_disposed)
{
if (_form != IntPtr.Zero)
{
NativePdfiumMethods.FORM_DoDocumentAAction(_form, NativePdfiumMethods.FPDFDOC_AACTION.WC);
NativePdfiumMethods.FPDFDOC_ExitFormFillEnviroument(_form);
_form = IntPtr.Zero;
}
if (_document != IntPtr.Zero)
{
NativePdfiumMethods.FPDF_CloseDocument(_document);
_document = IntPtr.Zero;
}
if (_formCallbacksHandle.IsAllocated)
{
_formCallbacksHandle.Free();
}
_disposed = true;
}
}
public byte[] GetPDFPage(int pageNumber)
{
if (_disposed)
{
throw new ObjectDisposedException(GetType().Name);
}
IntPtr newDocument = NativePdfiumMethods.FPDF_CreateNewDocument();
var bl = NativePdfiumMethods.FPDF_ImportPages(newDocument, _document, pageNumber.ToString(), 0);
int pageCount = NativePdfiumMethods.FPDF_GetPageCount(newDocument);
using (MemoryStream ms = new MemoryStream())
{
FPDF_FILEWRITE saveData = new FPDF_FILEWRITE();
saveData.WriteBlock = (WriteBlockCallback)((pThis, buffer, buflen) =>
{
ms.Write(buffer, 0, buffer.Length);
return(true);
});
try
{
NativePdfiumMethods.FPDF_SaveAsCopy(newDocument, saveData, 1);
}
finally
{
GC.KeepAlive((object)saveData);
}
NativePdfiumMethods.FPDF_CloseDocument(newDocument);
return(ms.ToArray());
}
}
