SQL Server

Check if a File is in Gzip Format

See more Gzip Examples

This example demonstrates how to use the ExamineFile method to determine whether a file is in Gzip format.

The method inspects the contents of the specified file and returns true if the file is recognized as a valid Gzip file, or false if it is not. This is useful for validating input files before attempting to decompress them.

If the method fails (for example, if the file does not exist or cannot be accessed), the CHECK_SUCCESS macro reports the error.

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
    -- This example demonstrates how to determine if a file is in Gzip format.

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

    -- The file to examine:
    DECLARE @filePath nvarchar(4000)
    SELECT @filePath = 'test.gz'

    -- Check if the file is a valid Gzip file:
    DECLARE @isGzip int
    EXEC sp_OAMethod @gzip, 'ExamineFile', @isGzip OUT, @filePath

    IF @isGzip = 1
      BEGIN

        PRINT 'The file is a valid Gzip file.'
      END
    ELSE
      BEGIN

        PRINT 'The file isnot a Gzip file.'
      END

    EXEC @hr = sp_OADestroy @gzip


END
GO