Classic ASP

Extract Embedded Files from PDF

Demonstrates how to get information about the embedded files (if any) contained within a PDF, and shows how to extract each file.

Note: This example requires Chilkat v9.5.0.95 or greater.

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Classic ASP

<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
</head>
<body>
<%
success = 0

'  This example requires the Chilkat API to have been previously unlocked.
'  See Global Unlock Sample for sample code.

set pdf = Server.CreateObject("Chilkat.Pdf")

success = pdf.LoadFile("qa_data/pdf/embedded_files/my_embedded_files_test.pdf")
If (success = 0) Then
    Response.Write "<pre>" & Server.HTMLEncode( pdf.LastErrorText) & "</pre>"
    Response.End
End If

'  Note: The embedded file functionality was added in Chilkat v9.5.0.95

'  How many embedded files exist within the opened PDF?
numFiles = pdf.NumEmbeddedFiles
Response.Write "<pre>" & Server.HTMLEncode( "Number of embedded files: " & numFiles) & "</pre>"

set json = Server.CreateObject("Chilkat.JsonObject")
json.EmitCompact = 0

set bd = Server.CreateObject("Chilkat.BinData")

'  Get information about each file, and extract each to the filesystem.
i = 0
Do While i < numFiles

    success = pdf.GetEmbeddedFileInfo(i,json)
    If (success = 0) Then
        Response.Write "<pre>" & Server.HTMLEncode( pdf.LastErrorText) & "</pre>"
        Response.End
    End If

    Response.Write "<pre>" & Server.HTMLEncode( json.Emit()) & "</pre>"

    '  Get the filename from the JSON.
    filename = "someFile.dat"

    '  The filename SHOULD always be present..
    If (json.HasMember("filename") = 1) Then
        filename = json.StringOf("filename")
    End If

    '  Get the file data.
    success = pdf.GetEmbeddedFileBd(i,bd)
    If (success = 0) Then
        Response.Write "<pre>" & Server.HTMLEncode( pdf.LastErrorText) & "</pre>"
        Response.End
    End If

    '  Save the contents of the bd to the filename (in the current working directory) in the filesystem.
    success = bd.WriteFile(filename)
    If (success = 0) Then
        Response.Write "<pre>" & Server.HTMLEncode( "Failed to write output file.") & "</pre>"
    End If

    i = i + 1
Loop

'  Sample output for the above code:

'  Number of embedded files: 3
'  {
'    "filename": "employees.json",
'    "desc": "JSON",
'    "subType": "application/json",
'    "size": 159,
'    "creationDate": "D:20230715170506-05'00'",
'    "modDate": "D:20160207153838-05'00'"
'  }
'  
'  {
'    "filename": "rsaPubKey.pem",
'    "desc": "RSA Public Key PEM",
'    "size": 451,
'    "creationDate": "D:20230715170546-05'00'",
'    "modDate": "D:20150724133153-05'00'"
'  }
'  
'  {
'    "filename": "starfish.jpg",
'    "desc": "Starfish JPG",
'    "subType": "image/jpeg",
'    "size": 6229,
'    "creationDate": "D:20230715170356-05'00'",
'    "modDate": "D:20080529103055-05'00'"
'  }

%>
</body>
</html>