SQL Server

Iterate Over ZIP Entries Using EntryAt

This example demonstrates how to use the EntryAt method to iterate over all entries contained within a ZIP archive.

The EntryAt method retrieves a ZipEntry object for a given zero-based index.

This is useful for:

• Enumerating all entries in a ZIP archive
• Inspecting filenames, sizes, and timestamps
• Searching or filtering ZIP contents

Suppose the ZIP archive contains:

docs/readme.txt
images/logo.png
data/config.json

The example loops through all ZIP entries and prints information about each entry.

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

    SELECT @success = 0

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

    -- Get the total number of entries in the ZIP archive.
    DECLARE @numEntries int
    EXEC sp_OAGetProperty @zip, 'NumEntries', @numEntries OUT


    PRINT 'Number of ZIP entries = ' + @numEntries

    -- Create a ZipEntry object that will be reused
    -- for each entry retrieved by EntryAt.
    DECLARE @entry int
    EXEC @hr = sp_OACreate 'Chilkat.ZipEntry', @entry OUT

    -- Iterate over all ZIP entries.
    DECLARE @i int
    SELECT @i = 0
    WHILE @i < @numEntries
      BEGIN

        -- Retrieve the entry at index i.
        EXEC sp_OAMethod @zip, 'EntryAt', @success OUT, @i, @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


        PRINT 'Entry ' + @i

        EXEC sp_OAGetProperty @entry, 'FileName', @sTmp0 OUT
        PRINT '  FileName: ' + @sTmp0

        EXEC sp_OAGetProperty @entry, 'UncompressedLength', @iTmp0 OUT
        PRINT '  Uncompressed Length: ' + @iTmp0

        EXEC sp_OAGetProperty @entry, 'CompressedLength', @iTmp0 OUT
        PRINT '  Compressed Length: ' + @iTmp0

        PRINT ''

        SELECT @i = @i + 1
      END

    -- Sample output:
    -- 
    -- Entry 0
    --   FileName: docs/readme.txt
    --   Uncompressed Length: 1204
    --   Compressed Length: 512
    -- 
    -- Entry 1
    --   FileName: images/logo.png
    --   Uncompressed Length: 84211
    --   Compressed Length: 84102
    -- 

    EXEC sp_OAMethod @zip, 'CloseZip', NULL


    PRINT 'Done.'

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


END
GO