PureBasic

Get Compressed ZIP Entry Data as Base64 Using ZipEntry.CopyToBase64

See more Zip Examples

This example creates a small ZIP archive containing a text file added from memory, writes the ZIP to disk, re-opens it, and then uses ZipEntry.CopyToBase64 to retrieve the compressed data for the text file as a Base64-encoded string.

The Base64 string returned by CopyToBase64 represents the compressed bytes stored for the entry inside the ZIP archive. It is not the original uncompressed text data.

PureBasic

IncludeFile "CkZip.pb"
IncludeFile "CkZipEntry.pb"

Procedure ChilkatExample()

    success.i = 0

    ; ------------------------------------------------------------
    ; First create a sample ZIP archive containing a small text file.

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

    success = CkZip::ckNewZip(zip,"c:/temp/sampleText.zip")
    If success = 0
        Debug CkZip::ckLastErrorText(zip)
        CkZip::ckDispose(zip)
        ProcedureReturn
    EndIf

    ; Add a small text file from memory.
    ; The text is stored in the ZIP as "hello.txt".
    success = CkZip::ckAddString(zip,"hello.txt","Hello from a ZIP entry!","utf-8")
    If success = 0
        Debug CkZip::ckLastErrorText(zip)
        CkZip::ckDispose(zip)
        ProcedureReturn
    EndIf

    ; Write the ZIP archive to disk and close it.
    success = CkZip::ckWriteZipAndClose(zip)
    If success = 0
        Debug CkZip::ckLastErrorText(zip)
        CkZip::ckDispose(zip)
        ProcedureReturn
    EndIf

    ; ------------------------------------------------------------
    ; Now open the ZIP archive we just created.

    zip2.i = CkZip::ckCreate()
    If zip2.i = 0
        Debug "Failed to create object."
        ProcedureReturn
    EndIf

    success = CkZip::ckOpenZip(zip2,"c:/temp/sampleText.zip")
    If success = 0
        Debug CkZip::ckLastErrorText(zip2)
        CkZip::ckDispose(zip)
        CkZip::ckDispose(zip2)
        ProcedureReturn
    EndIf

    ; Get the text file entry.
    entry.i = CkZipEntry::ckCreate()
    If entry.i = 0
        Debug "Failed to create object."
        ProcedureReturn
    EndIf

    success = CkZip::ckEntryOf(zip2,"hello.txt",entry)

    If success = 0
        Debug "Entry not found."
        CkZip::ckDispose(zip)
        CkZip::ckDispose(zip2)
        CkZipEntry::ckDispose(entry)
        ProcedureReturn
    EndIf

    ; Get the compressed ZIP entry data as Base64.
    ; 
    ; This is the compressed data stored inside the ZIP file,
    ; not the uncompressed text "Hello from a ZIP entry!".
    b64.s = CkZipEntry::ckCopyToBase64(entry)

    Debug "Base64 compressed ZIP entry data:"
    Debug b64

    CkZip::ckCloseZip(zip2)

    Debug "Done."


    CkZip::ckDispose(zip)
    CkZip::ckDispose(zip2)
    CkZipEntry::ckDispose(entry)


    ProcedureReturn
EndProcedure