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Features | Detailed Description
Available in VCL and ActiveX editions.
The Multi Downloader component allows you to download multiple 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.
Multi Downloader allows downloading of the entire web directory or website recursively.
Please see the Demos code (MultiDownLoader, GrabWebSite) and also the indexed Help system provided with the Clever Internet Suite installation for more details about using this component.
The most common members of the Multi Downloader component can be seen below:
Name
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Description
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 BatchSize |
Specifies the size of the transferred batch. |
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DownLoadList |
Determines a list of all DownloadItem objects to be downloaded. |
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FtpProxySettings |
Specifies the name of FTP proxy server to use when access via proxy is specified. |
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HttpProxySettings |
Specifies the name of HTTP proxy server to use when access via proxy is specified. |
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GrabOptions |
Allows users to set-up the desired Web resource types to grab. |
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MinResourceSize |
Specifies a low bound of resource size range in which the specified resource will be processed. |
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MaxResourceSize |
Specifies a high bound of resource size range in which the specified resource will be processed. |
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PassiveFTPMode |
Specifies passive FTP mode during connection. |
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ReconnectAfter |
Determines the time-out interval (in milliseconds) beetween reconnects. |
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TimeOut |
Determines the time-out interval (in milliseconds) for initiating the request for resources. |
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TryCount |
Determines the number of attempts to process a resource. |
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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. |
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Name
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Description
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AllowCompression |
Allows you to specify whether or not the threader can accept compressed resources from server. |
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DataStream |
Defines the data stream, to which the downloaded resource is saved. |
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CertificateFlags |
Allows ignoring certificate validation errors. To get more information about using certificates in the Clever Internet components see Using certificates page. |
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Errors |
Contains a list of errors for the internet control. |
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HttpResponseHeader |
Represents information about the HTTP response header fields. |
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KeepConnection |
Allows you to keep the internet connection opened after completing a process. |
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LocalFile |
Specifies the file name, to which the downloaded resource is saved. |
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Password |
Specifies the password that allows a control to log on to the server. |
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Preview |
Contains the preview of the downloaded resource. |
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Priority |
Determines the resource processing scheduling priority relative to other processes. |
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ResourceInfo |
Provides information about the processed resource. |
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ResourceState |
Contains the processing state: speed, time estimations, bytes proceeded. |
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ThreadCount |
Specifies the number of threads to be used for downloading a resource. |
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URL |
Specifies the Uniform Resource Locator (URL), from which the resource should be downloaded. |
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UserName |
Specifies the user name that allows a control to log on to the server. |
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Name
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Description
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CloseConnection |
Closes all opened internet connections. |
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GetAllCookies |
Retrieves all cookies for the specified URL. |
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GetCookie |
Retrieves the cookie with the specified name for the specified URL. |
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GetFtpDirList |
Gets a list of files and directories on the FTP server. |
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GetResourceInfo |
Returns the information about the resource assigned to a specific item. |
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GrabWebsite |
Forces the downloading of the entire web directory or website recursively. |
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ReadRegistry |
Loads internet component settings from the System Registry. |
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SetCookie |
Creates a cookie associated with the specified URL. |
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Start |
Starts the downloading process. |
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Stop |
Stops the resource downloading. |
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WriteRegistry |
Saves internet component settings to the System Registry. |
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Name
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Description
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OnDataItemProceed |
Occurs when a batch is downloaded. |
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OnError |
Occurs when an error is encountered when performing any action. |
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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. |
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OnGetResourceInfo |
Occurs when obtaining the information about a resource. |
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OnProcessCompleted |
Occurs when a specified internet item completed the resource processing. |
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OnProcessNextUrl |
Occurs when the component is about to determine whenther it should download the next URL from the DownloadList. |
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OnStatusChanged |
Occurs on any resource processing event. |
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OnURLParsing |
Occurs on parsing a URL where a resource is located. |
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