DataFlex

Extract data:image/png;base64 from HTML

See more Base64 Examples

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

Use ChilkatAx-win32.pkg

Procedure Test
    Boolean iSuccess
    Handle hoSb
    Handle hoBd
Filename    Handle hoSbFilename
    Integer iIndex
    Boolean iMayHaveMore
    String sSBase64
    Integer iCount
    String sTemp1
    Integer iTemp1
    Boolean bTemp1

    Move False To iSuccess

    Get Create (RefClass(cComChilkatStringBuilder)) To hoSb
    If (Not(IsComObjectCreated(hoSb))) Begin
        Send CreateComObject of hoSb
    End
    Get Create (RefClass(cComChilkatBinData)) To hoBd
    If (Not(IsComObjectCreated(hoBd))) Begin
        Send CreateComObject of hoBd
    End
    Get Create (RefClass(cComChilkatStringBuilder)) To hoSbFilename
    If (Not(IsComObjectCreated(hoSbFilename))) Begin
        Send CreateComObject of hoSbFilename
    End
    Move 1 To iIndex

    Get ComLoadFile Of hoSb "qa_data/html/oresp body.txt" "utf-8" To iSuccess
    // Assume success.
    Get ComLength Of hoSb To iTemp1
    Showln "length = " iTemp1

    Move True To iMayHaveMore
    While (iMayHaveMore = True)

        // Get the base64 between the 1st occurrence "data:image/png;base64," and "'"
        Get ComGetBetween Of hoSb "data:image/png;base64," "'" To sSBase64

        // If nothing is found, then we'll exit the loop because there are no more.
        Get ComLastMethodSuccess Of hoSb To iMayHaveMore

        Get ComLastMethodSuccess Of hoSb To bTemp1
        If (bTemp1 = True) Begin
            // Found something.
            // Load into bd and save.
            Get ComLoadEncoded Of hoBd sSBase64 "base64" To iSuccess

            Get ComSetString Of hoSbFilename "qa_output/png_" To iSuccess
            Get ComAppendInt Of hoSbFilename iIndex To iSuccess
            Get ComAppend Of hoSbFilename ".png" To iSuccess

            Get ComGetAsString Of hoSbFilename To sTemp1
            Get ComWriteFile Of hoBd sTemp1 To iSuccess

            // Replace "data:image/png;base64" with "data:image-png;base64" so the next iteration finds the next occurrence.
            Get ComReplaceFirst Of hoSb "data:image/png;base64" "data:image-png;base64" To iSuccess
        End

        Move (iIndex + 1) To iIndex
    Loop

    // Restore our replacements..
    Get ComReplace Of hoSb "data:image-png;base64" "data:image/png;base64" To iCount

    Showln "All done."


End_Procedure