Canvas does not allow drawing

1. offizieller Beitrag

    Hi
    I am having a problem writing large PDF files.
    I am trying to write a two page letter for 5000 students. Each letter is added to a PDF file using WPPDFExport.Print.
    After about 4800 writes to the file I get the following error.
    Canvas does not allow drawing

    I think the problem is that the Method TWPDFEnhMetafile.BeginDraw
    has the code

    Code
    if RefDC = 0 then
      dc := GetDc(0)
    else dc := RefDC;
    try
BUT THEN
    finally
      if RefDC <> 0 then
        ReleaseDC(0, dc);

    So the DC resorce is not released.
    What do you think?
    Is this the problem or is there something else I sould be doing?

    Thanks in advance

    Jeff