Description of "showiptc.asp"

The form data is posted to "showiptc.asp" which uses csASPUpload to extract the uploaded file as well as some other file information. The image data is then passed into the csImageFile component where it is resized and the IPTC text extracted.

Usually the file would then be saved to disk or input into a database but as this is a demonstration using somebody else's image, we have avoided doing this. The file data is stored in a session variable so it can be used later in the script "showiptcimage.asp". This is a technique that should be treated with caution because storing large amounts of data in session variables can use a lot of memory. In this case the image is stored after resizing, and the session variable is reset immediately after use, so there should be no problems. This part of the example is identical to the Upload and Resize example so the description is not repeated here.

Below is some of the code that extracts the IPTC meta data:

If not Image.HasFileInfo and not Image.HasXMP Then
  Response.Write "No meta data in the image."
  Response.Write "<p><b>IPTC text:</b><br>"
  If Image.FFO_Caption <> "" Then
    Response.Write "Caption: " & Server.HTMLEncode(Image.FFO_Caption) & "<br>"
  End If
  If Image.FFO_CaptionWriter <> "" Then
    Response.Write "Caption Writer: " &_
      Server.HTMLEncode(Image.FFO_CaptionWriter) & "<br>"
  End If
  If Image.FFO_Headline <> "" Then
    Response.Write "Headline: " & Server.HTMLEncode(Image.FFO_Headline) & "<br>"
  End If

  If Image.FFO_DateCreated <> 0 Then
    Response.Write "Date Created: " &_
      Server.HTMLEncode(Image.FFO_DateCreated) & "<br>"
  End If
  If Image.FFO_CopyrightFlag = true Then
    Response.Write "Copyright Flag: " &_
      Server.HTMLEncode(Image.FFO_CopyrightFlag) & "<br>"
  End If
  If Image.FFO_KeywordsCount > 0 Then
    Response.Write "Keywords: "
    For I = 0 to Image.FFO_KeywordsCount - 1
      Response.Write Image.FFO_Keywords(I) & " "
    Response.Write "<br>"
  End If
  If Image.FFO_SuppCatCount > 0 Then
    Response.Write "Supplemental Categories: "
    For I = 0 to Image.FFO_SuppCatCount - 1
      Response.Write Image.FFO_SuppCat(I) & " "
    Response.Write "<br>"
  End If
  Response.Write "Urgency: " & Image.FFO_Urgency & "</p>"
End If

Each meta data attribute supported has its own property. Most are string values and only the first three are shown here. The Keywords and SupplementalCategories are lists of values and they are displayed by looping through the list.

People tags are also lists and they require a loop, but the rectangle is optional and is not always present. csImageFile converts the rectangle postion and dimensions into pixels and so the values displayed are relevant to the resized image, not the original. The values stored inside the file are fractions of the image size and so they still locate the same region after resizing the image.

  If Image.XMPPersonTagCount > 0 Then
    For I = 0 to Image.XMPPersonTagCount - 1
      Response.Write "XMPPersonTag: " & Image.XMPPersonTag(I) & "<br />"
      If Image.XMPRectangleWidth(I) > 0 Then
        Response.Write "Rectangle Position: (" & Image.XMPRectangleX(I) & ", " &_ Image.XMPRectangleY(I) & ")<br />"
        Response.Write "Rectangle Size: " & Image.XMPRectangleWidth(I) & " x " &_ Image.XMPRectangleHeight(I) & "<br />"
      End If
  End If

Return to the upload form.


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