Visual Basic 6.0

Extract data:image/png;base64 from HTML

See more Base64 Examples

Demonstrates how to extract base64 image data from HTMl and save to files. Visual Basic 6.0

Dim success As Long
success = 0

Dim sb As New ChilkatStringBuilder
Dim bd As New ChilkatBinData
Dim sbFilename As New ChilkatStringBuilder
Dim index As Long
index = 1

success = sb.LoadFile("qa_data/html/oresp body.txt","utf-8")
' Assume success.
Debug.Print "length = " & sb.Length

Dim mayHaveMore As Long
mayHaveMore = 1
Do While mayHaveMore = 1

    ' Get the base64 between the 1st occurrence "data:image/png;base64," and "'"
    Dim sBase64 As String
    sBase64 = sb.GetBetween("data:image/png;base64,","'")

    ' If nothing is found, then we'll exit the loop because there are no more.
    mayHaveMore = sb.LastMethodSuccess

    If (sb.LastMethodSuccess = 1) Then
        ' Found something.
        ' Load into bd and save.
        success = bd.LoadEncoded(sBase64,"base64")

        success = sbFilename.SetString("qa_output/png_")
        success = sbFilename.AppendInt(index)
        success = sbFilename.Append(".png")

        success = bd.WriteFile(sbFilename.GetAsString())

        ' Replace "data:image/png;base64" with "data:image-png;base64" so the next iteration finds the next occurrence.
        success = sb.ReplaceFirst("data:image/png;base64","data:image-png;base64")
    End If

    index = index + 1
Loop

' Restore our replacements..
Dim count As Long
count = sb.Replace("data:image-png;base64","data:image/png;base64")

Debug.Print "All done."