SQL Server

Iterate Through ZIP Entries Using EntryAt and ZipEntry.GetNext

See more Zip Examples

This example demonstrates how to iterate through all entries in a ZIP archive using:

• Zip.EntryAt to obtain the first entry
• ZipEntry.GetNext to advance through the remaining entries

The example prints each ZIP entry's stored filename and whether the entry is a file or directory.

This approach is useful when sequentially processing ZIP entries without repeatedly calling EntryAt by index.

Suppose the ZIP archive contains:

docs/
docs/readme.txt
images/logo.png
hello.txt

The example iterates through each entry in the order stored within the ZIP archive.

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
    DECLARE @iTmp0 int
    -- Important: Do not use nvarchar(max).  See the warning about using nvarchar(max).
    DECLARE @sTmp0 nvarchar(4000)
    DECLARE @success int
    SELECT @success = 0

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

    -- Open an existing ZIP archive.
    EXEC sp_OAMethod @zip, 'OpenZip', @success OUT, 'c:/temp/example.zip'
    IF @success = 0
      BEGIN
        EXEC sp_OAGetProperty @zip, 'LastErrorText', @sTmp0 OUT
        PRINT @sTmp0
        EXEC @hr = sp_OADestroy @zip
        RETURN
      END

    -- A ZIP archive may contain zero entries.
    EXEC sp_OAGetProperty @zip, 'NumEntries', @iTmp0 OUT
    IF @iTmp0 = 0
      BEGIN


        PRINT 'The ZIP archive is empty.'

        EXEC sp_OAMethod @zip, 'CloseZip', NULL
        EXEC @hr = sp_OADestroy @zip
        RETURN
      END

    -- ------------------------------------------------------------
    -- Get the first ZIP entry.
    -- 
    -- EntryAt(0,entry) initializes the ZipEntry object so that
    -- it represents the first entry in the ZIP archive.
    -- 
    DECLARE @entry int
    EXEC @hr = sp_OACreate 'Chilkat.ZipEntry', @entry OUT

    EXEC sp_OAMethod @zip, 'EntryAt', @success OUT, 0, @entry
    IF @success = 0
      BEGIN
        EXEC sp_OAGetProperty @zip, 'LastErrorText', @sTmp0 OUT
        PRINT @sTmp0
        EXEC @hr = sp_OADestroy @zip
        EXEC @hr = sp_OADestroy @entry
        RETURN
      END

    -- ------------------------------------------------------------
    -- Iterate through all ZIP entries.
    -- 
    -- GetNext updates the same ZipEntry object so that it
    -- represents the next entry in the ZIP archive.
    -- 
    WHILE (@success = 1)
      BEGIN

        EXEC sp_OAGetProperty @entry, 'IsDirectory', @iTmp0 OUT
        IF @iTmp0 = 1
          BEGIN


            EXEC sp_OAGetProperty @entry, 'FileName', @sTmp0 OUT
            PRINT '[Directory] ' + @sTmp0

          END
        ELSE
          BEGIN


            EXEC sp_OAGetProperty @entry, 'FileName', @sTmp0 OUT
            PRINT '[File] ' + @sTmp0
          END

        -- Advance to the next entry.
        EXEC sp_OAMethod @entry, 'GetNext', @success OUT
      END

    EXEC sp_OAMethod @zip, 'CloseZip', NULL


    PRINT 'Done.'

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


END
GO