PureBasic

Extract data:image/png;base64 from HTML

See more Base64 Examples

Demonstrates how to extract base64 image data from HTMl and save to files. PureBasic

IncludeFile "CkStringBuilder.pb"
IncludeFile "CkBinData.pb"

Procedure ChilkatExample()

    success.i = 0

    sb.i = CkStringBuilder::ckCreate()
    If sb.i = 0
        Debug "Failed to create object."
        ProcedureReturn
    EndIf

    bd.i = CkBinData::ckCreate()
    If bd.i = 0
        Debug "Failed to create object."
        ProcedureReturn
    EndIf

    sbFilename.i = CkStringBuilder::ckCreate()
    If sbFilename.i = 0
        Debug "Failed to create object."
        ProcedureReturn
    EndIf

    index.i = 1

    success = CkStringBuilder::ckLoadFile(sb,"qa_data/html/oresp body.txt","utf-8")
    ; Assume success.
    Debug "length = " + Str(CkStringBuilder::ckLength(sb))

    mayHaveMore.i = 1
    While mayHaveMore = 1

        ; Get the base64 between the 1st occurrence "data:image/png;base64," and "'"
        sBase64.s = CkStringBuilder::ckGetBetween(sb,"data:image/png;base64,","'")

        ; If nothing is found, then we'll exit the loop because there are no more.
        mayHaveMore = CkStringBuilder::ckLastMethodSuccess(sb)

        If CkStringBuilder::ckLastMethodSuccess(sb) = 1
            ; Found something.
            ; Load into bd and save.
            success = CkBinData::ckLoadEncoded(bd,sBase64,"base64")

            CkStringBuilder::ckSetString(sbFilename,"qa_output/png_")
            CkStringBuilder::ckAppendInt(sbFilename,index)
            CkStringBuilder::ckAppend(sbFilename,".png")

            CkBinData::ckWriteFile(bd,CkStringBuilder::ckGetAsString(sbFilename))

            ; Replace "data:image/png;base64" with "data:image-png;base64" so the next iteration finds the next occurrence.
            CkStringBuilder::ckReplaceFirst(sb,"data:image/png;base64","data:image-png;base64")
        EndIf

        index = index + 1
    Wend

    ; Restore our replacements..
    count.i = CkStringBuilder::ckReplace(sb,"data:image-png;base64","data:image/png;base64")

    Debug "All done."


    CkStringBuilder::ckDispose(sb)
    CkBinData::ckDispose(bd)
    CkStringBuilder::ckDispose(sbFilename)


    ProcedureReturn
EndProcedure