Downloader Description

Features | Detailed Description

Available in VCL and ActiveX editions.

The Downloader component allows you to download the Internet-resources via HTTP, HTTPS and FTP protocols asynchronously and obtain all the necessary information about them without interfering with the main application processes.

This component supports the Multipart Multithreaded Downloading feature with the ability to resume the process from the point where it stops. You can start downloading internet resources from any random point you want.

The Web and Proxy authentication in Basic, Digest, NTLM and Kerberos modes is also supported.

Data compression provides faster transmission time between compression-enabled internet clients and web servers thus accelerate downloading performance many times.

Please see the Demos code (SingleDownLoader) and also the indexed Help documentation provided with the Clever Internet Suite installation for more details about using this component.

The most common members of the Downloader component can be seen below:

Property List

Name	Description
AllowCompression	Allows you to specify whether or not the threader can accept compressed resources from server.
BatchSize	Specifies the size of the transferred batch.
CertificateFlags	Allows ignoring certificate validation errors. To get more information about using certificates in the Clever Internet components see Using certificates page.
DataStream	Defines the data stream, to which the downloaded resource is saved.
Errors	Contains a list of errors for the internet control.
HttpProxySettings,     FtpProxySettings	Specifies the name of the proxy server(s) to use when access via proxy is specified.
HttpResponseHeader	Represents information about the HTTP response header fields.
KeepConnection	Allows you to keep the internet connection opened after completing a process.
LocalFile	Specifies the file name, to which the downloaded resource is saved.
MinResourceSize	Specifies a low bound of resource size range in which the specified resource will be processed.
MaxResourceSize	Specifies a high bound of resource size range in which the specified resource will be processed.
PassiveFTPMode	Specifies passive FTP mode during connection.
Password	Specifies the password that allows a control to log on to the server.
Preview	Contains the preview of the downloaded resource.
Priority	Determines the resource processing scheduling priority relative to other processes.
ReconnectAfter	Determines the time-out interval (in milliseconds) beetween reconnects.
ResourceInfo	Provides information about the processed resource.
ResourceState	Contains the processing state: speed, time estimations, bytes proceeded.
ThreadCount	Specifies the number of threads to be used for downloading a resource.
TimeOut	Determines the time-out interval (in milliseconds) for initiating the request for resources.
TryCount	Determines the number of attempts to process a resource.
URL	Specifies the Uniform Resource Locator (URL), from which the resource should be downloaded.
UseInternetErrorDialog	Allows users to set up a certificate in the interactive GUI mode. To get more information about using certificates in the Clever Internet components see Using certificates page.
UserName	Specifies the user name that allows a control to log on to the server.

Method List

Name	Description
CloseConnection	Closes all opened internet connections.
GetAllCookies	Retrieves all cookies for the specified URL.
GetCookie	Retrieves the cookie with the specified name for the specified URL.
GetFtpDirList	Gets a list of files and directories on the FTP server.
GetResourceInfo	Returns the information about the resource assigned to a specific item.
ReadRegistry	Loads internet component settings from the System Registry.
SetCookie	Creates a cookie associated with the specified URL.
Start	Starts the downloading process.
Stop	Stops the resource downloading.
WriteRegistry	Saves internet component settings to the System Registry.

Event List

Name	Description
OnDataItemProceed	Occurs when a batch is downloaded.
OnError	Occurs when an error is encountered when performing any action.
OnGetCertificate	Occurs when a server needs a certificate for establishing the connection. To get more information about using certificates in the Clever Internet components see Using certificates page.
OnGetResourceInfo	Occurs when obtaining the information about a resource.
OnProcessCompleted	Occurs when a specified internet item completed the resource processing.
OnStatusChanged	Occurs on any resource processing event.
OnURLParsing	Occurs on parsing a URL where a resource is located.

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