File download method

To download a resource and continue executing while waiting for the server's response, use one of the DownloadFileAsync methods. If the QueryString property is not an empty string, it is appended to address. This member outputs trace information when you enable network tracing in your application. For more information, see Network Tracing in. NET Framework. When using this method in a middle tier application, such as an ASP. NET page, you will receive an error if the account under which the application executes does not have permission to access the file.

Skip to main content. This browser is no longer supported. Download Microsoft Edge More info. Contents Exit focus mode. Support for method "libcurl" is optional on Windows: use capabilities "libcurl" to see if it is supported on your build. There is support for simultaneous downloads, so url and destfile can be character vectors of the same length greater than one but the method has to be specified explicitly and not via "auto".

For methods "wget" and "curl" a system call is made to the tool given by method , and the respective program must be installed on your system and be in the search path for executables. They will block all other activity on the R process until they complete: this may make a GUI unresponsive. It is used by available.

The "wininet" method supports some redirections but not all. For method "libcurl" , messages will quote the endpoint of redirections. Most methods do not percent-encode special characters such as spaces in URLs see URLencode , but it seems the "wininet" method does.

The remaining details apply to the "internal" , "wininet" and "libcurl" methods only. The timeout for many parts of the transfer can be set by the option timeout which defaults to 60 seconds.

The level of detail provided during transfer can be set by the quiet argument and the internet. For the "internal" method setting option internet. Using 2 the default gives only serious messages, and 3 or more suppresses all messages.

For the "libcurl" method values of the option less than 2 give verbose output. If the file length is known, the full width of the bar is the known length. This parameter is not supported by the web client.

The title is determined by the end-user's browser. The folder name is displayed in the dialog box for downloading the file. The folder can be changed by the user. By default, the files are saved to the default download location that is configured in the end-user's browser.

The type is displayed in the dialog box for downloading the file. This is the default file name that is shown in the dialog box for downloading the file.

This value can be changed by the user. If you omit this optional return value and the operation does not execute successfully, a runtime error will occur. On devices that run Apple iOS, such as iPad, you can only download a file if the Apple iOS device on which you are downloading the file has an application which supports the file type. The business logic is run on the computer that is running Dynamics Business Central service and not on the client. Files are created on the computer that is running Dynamics Business Central service and not locally on the client computer.