SQL Server

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.

SQL Server

-- Important: See this note about string length limitations for strings returned by sp_OAMethod calls.
--
CREATE PROCEDURE ChilkatSample
AS
BEGIN
    DECLARE @hr int
    -- Important: Do not use nvarchar(max).  See the warning about using nvarchar(max).
    DECLARE @sTmp0 nvarchar(4000)
    DECLARE @success int
    SELECT @success = 0

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

    DECLARE @zip int
    EXEC @hr = sp_OACreate 'Chilkat.Zip', @zip OUT
    IF @hr <> 0
    BEGIN
        PRINT 'Failed to create ActiveX component'
        RETURN
    END

    EXEC sp_OAMethod @zip, 'NewZip', @success OUT, 'c:/temp/sampleText.zip'
    IF @success = 0
      BEGIN
        EXEC sp_OAGetProperty @zip, 'LastErrorText', @sTmp0 OUT
        PRINT @sTmp0
        EXEC @hr = sp_OADestroy @zip
        RETURN
      END

    -- Add a small text file from memory.
    -- The text is stored in the ZIP as "hello.txt".
    EXEC sp_OAMethod @zip, 'AddString', @success OUT, 'hello.txt', 'Hello from a ZIP entry!', 'utf-8'
    IF @success = 0
      BEGIN
        EXEC sp_OAGetProperty @zip, 'LastErrorText', @sTmp0 OUT
        PRINT @sTmp0
        EXEC @hr = sp_OADestroy @zip
        RETURN
      END

    -- Write the ZIP archive to disk and close it.
    EXEC sp_OAMethod @zip, 'WriteZipAndClose', @success OUT
    IF @success = 0
      BEGIN
        EXEC sp_OAGetProperty @zip, 'LastErrorText', @sTmp0 OUT
        PRINT @sTmp0
        EXEC @hr = sp_OADestroy @zip
        RETURN
      END

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

    DECLARE @zip2 int
    EXEC @hr = sp_OACreate 'Chilkat.Zip', @zip2 OUT

    EXEC sp_OAMethod @zip2, 'OpenZip', @success OUT, 'c:/temp/sampleText.zip'
    IF @success = 0
      BEGIN
        EXEC sp_OAGetProperty @zip2, 'LastErrorText', @sTmp0 OUT
        PRINT @sTmp0
        EXEC @hr = sp_OADestroy @zip
        EXEC @hr = sp_OADestroy @zip2
        RETURN
      END

    -- Get the text file entry.
    DECLARE @entry int
    EXEC @hr = sp_OACreate 'Chilkat.ZipEntry', @entry OUT

    EXEC sp_OAMethod @zip2, 'EntryOf', @success OUT, 'hello.txt', @entry

    IF @success = 0
      BEGIN

        PRINT 'Entry not found.'
        EXEC @hr = sp_OADestroy @zip
        EXEC @hr = sp_OADestroy @zip2
        EXEC @hr = sp_OADestroy @entry
        RETURN
      END

    -- 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!".
    DECLARE @b64 nvarchar(4000)
    EXEC sp_OAMethod @entry, 'CopyToBase64', @b64 OUT


    PRINT 'Base64 compressed ZIP entry data:'

    PRINT @b64

    EXEC sp_OAMethod @zip2, 'CloseZip', NULL


    PRINT 'Done.'

    EXEC @hr = sp_OADestroy @zip
    EXEC @hr = sp_OADestroy @zip2
    EXEC @hr = sp_OADestroy @entry


END
GO