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Downloader.SessionStartToFile method

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Remarks

 

Starts a download session of a remote file pointed by a URL and stores the downloaded file inside a given pathname using the same filename of the remote file.

 

A successful call to this method will fire the following sequence of events:

- the DownloaderSessionStarted event

- a sequence of DownloaderSessionProgress events informing about the download advancement in percentage

- the DownloaderSessionCompleted event

 

In case the connection to the remote server or the access to the remote file should fail, the DownloaderSessionFailed would be invoked.

In case the connection should be stopped by the user through a call to the Downloader.SessionStop method, the DownloaderSessionStopped event would be generated.

 

For details about management of download sessions from HTTP and FTP servers, refer to the How to manage download sessions tutorial.

 

 

Syntax

 

[Visual Basic]

control.Downloader.SessionStartToFile (

strURL as String,

strUsername as String,

strPassword as String,

strDestinationPath as String,

bDisableCache as enumBoolean

) as Long


 

[C++]

long control.Downloader.SessionStartToFile (

LPCTSTR strURL,

LPCTSTR strUsername,

LPCTSTR strPassword,

LPCTSTR strDestinationPath,

short bDisableCache

);


 

 

Parameter

Description

 

 

strURL

String containing the URL pointing to the remote media file to download. Accepted Internet protocols for the passed URL must be of type HTTP or FTP.

strUsername

String containing the username for accessing the server. Leave the string empty if the directory containing the remote file is not username protected.

strPassword

String containing the password for accessing the server. Leave the string empty if the directory containing the remote file is not password protected.

strDestinationPath

String containing the path on the local system where the downloaded file will be stored: the path must not contain the filename, indeed the same filename of the remote file will be used for creating the local file copy.

bDisableCache

Flag for determining if the usage of the Internet cache must be disabled or not.

Supported values are the following:

Mnemonic constant

Value

Meaning

BOOL_FALSE

0

If the file to download is already inside the Internet cache, allows taking the cached file.

BOOL_TRUE

1

Never use an eventual cached file, always take it from the remote server.

 

 

Return value

 

Value

Meaning

 

 

Value >= 0

The method call was successful and the returned value is the unique identifier of the download session.

Negative value

An error occurred: see the LastError property for error details or for a list of the possible error values.

In case the error code should be ERR_DOWNLOADER_REMOTE_FILE_FAILURE or ERR_DOWNLOADER_LOCAL_FILE_FAILURE the Downloader.LastFileExceptionGet method would provide the nature of the error which may assume one of the following values:

Value

Meaning

1

An unspecified error occurred.

2

The file could not be located.

3

All or part of the path is invalid.

4

The permitted number of open files was exceeded.

5

The file could not be accessed.

6

There was an attempt to use an invalid file handle.

7

The current working directory cannot be removed.

8

There are no more directory entries.

9

There was an error trying to set the file pointer.

10

There was a hardware error.

11

SHARE.EXE was not loaded, or a shared region was locked.

12

There was an attempt to lock a region that was already locked.

13

The disk is full.

14

The end of file was reached.