Chilkat Examples

ChilkatHOMEAndroid™Classic ASPCC++C#Mono C#.NET Core C#C# UWP/WinRTDataFlexDelphi ActiveXDelphi DLLVisual FoxProJavaLianjaMFCObjective-CPerlPHP ActiveXPHP ExtensionPowerBuilderPowerShellPureBasicCkPythonChilkat2-PythonRubySQL ServerSwift 2Swift 3,4,5...TclUnicode CUnicode C++Visual Basic 6.0VB.NETVB.NET UWP/WinRTVBScriptXojo PluginNode.jsExcelGo

SQL Server Examples

Web API Categories

ASN.1
Amazon EC2
Amazon Glacier
Amazon S3
Amazon S3 (new)
Amazon SES
Amazon SNS
Amazon SQS
Async
Azure Cloud Storage
Azure Service Bus
Azure Table Service
Base64
Bounced Email
Box
CAdES
CSR
CSV
Certificates
Compression
DKIM / DomainKey
DSA
Diffie-Hellman
Digital Signatures
Dropbox
Dynamics CRM
EBICS
ECC
Ed25519
Email Object
Encryption
FTP
FileAccess
Firebase
GMail REST API
GMail SMTP/IMAP/POP
Geolocation
Google APIs
Google Calendar
Google Cloud SQL
Google Cloud Storage
Google Drive
Google Photos
Google Sheets
Google Tasks
Gzip
HTML-to-XML/Text

HTTP
HTTP Misc
IMAP
JSON
JSON Web Encryption (JWE)
JSON Web Signatures (JWS)
JSON Web Token (JWT)
Java KeyStore (JKS)
MHT / HTML Email
MIME
MS Storage Providers
Microsoft Graph
NTLM
OAuth1
OAuth2
Office365
OneDrive
OpenSSL
Outlook
Outlook Calendar
PDF Signatures
PEM
PFX/P12
POP3
PRNG
REST
REST Misc
RSA
SCP
SCard
SFTP
SMTP
SSH
SSH Key
SSH Tunnel
ScMinidriver
SharePoint
Socket/SSL/TLS
Spider
Stream
Tar Archive
Upload
WebSocket
XAdES
XML
XML Digital Signatures
XMP
Zip
curl

 

 

 

(SQL Server) Streaming Compression

Compress and decompress using a stream.

Chilkat ActiveX Downloads

ActiveX for 32-bit and 64-bit Windows

CREATE PROCEDURE ChilkatSample
AS
BEGIN
    DECLARE @hr int
    DECLARE @iTmp0 int
    DECLARE @sTmp0 nvarchar(4000)
    DECLARE @sTmp1 nvarchar(4000)
    -- This example assumes the Chilkat API to have been previously unlocked.
    -- See Global Unlock Sample for sample code.

    DECLARE @fac int
    EXEC @hr = sp_OACreate 'Chilkat_9_5_0.FileAccess', @fac OUT
    IF @hr <> 0
    BEGIN
        PRINT 'Failed to create ActiveX component'
        RETURN
    END

    DECLARE @compress int
    EXEC @hr = sp_OACreate 'Chilkat_9_5_0.Compression', @compress OUT

    EXEC sp_OASetProperty @compress, 'Algorithm', 'deflate'

    DECLARE @streamC int
    EXEC @hr = sp_OACreate 'Chilkat_9_5_0.Stream', @streamC OUT

    -- This example sets the source and sink of the stream to files.
    -- A stream can have use other streams as a source or sink,
    -- or the application can itself be the source/sink by directly
    -- reading or writing a stream.  (See below for an example of this..)
    EXEC sp_OASetProperty @streamC, 'SourceFile', 'qa_data/hamlet.xml'
    EXEC sp_OASetProperty @streamC, 'SinkFile', 'qa_output/hamlet_compressed.dat'

    -- Compress from source to sink.
    DECLARE @success int
    EXEC sp_OAMethod @compress, 'CompressStream', @success OUT, @streamC
    IF @success <> 1
      BEGIN
        EXEC sp_OAGetProperty @compress, 'LastErrorText', @sTmp0 OUT
        PRINT @sTmp0
        EXEC @hr = sp_OADestroy @fac
        EXEC @hr = sp_OADestroy @compress
        EXEC @hr = sp_OADestroy @streamC
        RETURN
      END


    PRINT 'File-to-file deflate compression successful.'

    EXEC sp_OAGetProperty @streamC, 'SourceFile', @sTmp0 OUT
    EXEC sp_OAMethod @fac, 'FileSize', @iTmp0 OUT, @sTmp0
    PRINT 'Original size = ' + @iTmp0

    EXEC sp_OAGetProperty @streamC, 'SinkFile', @sTmp0 OUT
    EXEC sp_OAMethod @fac, 'FileSize', @iTmp0 OUT, @sTmp0
    PRINT 'Compressed size = ' + @iTmp0

    -- Now do file-to-file decompression
    DECLARE @streamD int
    EXEC @hr = sp_OACreate 'Chilkat_9_5_0.Stream', @streamD OUT

    EXEC sp_OASetProperty @streamD, 'SourceFile', 'qa_output/hamlet_compressed.dat'
    EXEC sp_OASetProperty @streamD, 'SinkFile', 'qa_output/hamlet_restored.xml'

    -- Decompress from source to sink.
    EXEC sp_OAMethod @compress, 'DecompressStream', @success OUT, @streamD
    IF @success <> 1
      BEGIN
        EXEC sp_OAGetProperty @compress, 'LastErrorText', @sTmp0 OUT
        PRINT @sTmp0
        EXEC @hr = sp_OADestroy @fac
        EXEC @hr = sp_OADestroy @compress
        EXEC @hr = sp_OADestroy @streamC
        EXEC @hr = sp_OADestroy @streamD
        RETURN
      END


    PRINT 'File-to-file deflate decompression successful.'

    -- Let's double-check to see that the files are equal in size and content:

    DECLARE @bFilesEqual int
    EXEC sp_OAGetProperty @streamC, 'SourceFile', @sTmp0 OUT
    EXEC sp_OAGetProperty @streamD, 'SinkFile', @sTmp1 OUT
    EXEC sp_OAMethod @fac, 'FileContentsEqual', @bFilesEqual OUT, @sTmp0, @sTmp1
    IF @bFilesEqual <> 1
      BEGIN

        PRINT 'The output file is not equal to the input file!'
      END
    ELSE
      BEGIN

        PRINT 'The file was successfully compressed and decompressed.'
      END

    -- ---------------------------------------------------------------------
    -- Now let's decompress again, but this time w/ the application reading
    -- the decompressed data directly from a stream.
    DECLARE @streamA int
    EXEC @hr = sp_OACreate 'Chilkat_9_5_0.Stream', @streamA OUT

    EXEC sp_OASetProperty @streamA, 'SourceFile', 'qa_output/hamlet_compressed.dat'

    -- Start decompressing in a background thread.
    DECLARE @task int
    EXEC sp_OAMethod @compress, 'DecompressStreamAsync', @task OUT, @streamA
    EXEC sp_OAMethod @task, 'Run', @success OUT

    -- Read decompressed data from streamA:
    DECLARE @decompressedText nvarchar(4000)

    EXEC sp_OAGetProperty @streamA, 'EndOfStream', @iTmp0 OUT
    WHILE (@iTmp0 <> 1)
      BEGIN
        EXEC sp_OAGetProperty @streamA, 'DataAvailable', @iTmp0 OUT
        IF @iTmp0 = 1
          BEGIN
            EXEC sp_OAMethod @streamA, 'ReadString', @decompressedText OUT

            PRINT @decompressedText
          END
      END

    -- Let's make sure the background task finished and that the decompress was successful.
    -- It should already be the case that the task is finished.
    EXEC sp_OAGetProperty @task, 'Finished', @iTmp0 OUT
    WHILE (@iTmp0 <> 1)
      BEGIN
        EXEC sp_OAMethod @task, 'SleepMs', NULL, 20
      END

    -- The decompressor may have finished, but it is possible that data
    -- remains to be flushed.  
    EXEC sp_OAGetProperty @streamA, 'DataAvailable', @iTmp0 OUT
    IF @iTmp0 = 1
      BEGIN
        EXEC sp_OAMethod @streamA, 'ReadString', @decompressedText OUT

        PRINT @decompressedText
      END

    -- Did streamA succeed in reading the entire file?
    EXEC sp_OAGetProperty @task, 'TaskSuccess', @iTmp0 OUT
    IF @iTmp0 <> 1
      BEGIN

        PRINT 'async decompress failed:'
        EXEC sp_OAGetProperty @task, 'ResultErrorText', @sTmp0 OUT
        PRINT @sTmp0
        SELECT @success = 0
      END


    PRINT 'The async decompress was successful.'

    EXEC @hr = sp_OADestroy @fac
    EXEC @hr = sp_OADestroy @compress
    EXEC @hr = sp_OADestroy @streamC
    EXEC @hr = sp_OADestroy @streamD
    EXEC @hr = sp_OADestroy @streamA


END
GO

 

© 2000-2021 Chilkat Software, Inc. All Rights Reserved.