How to use, download UI element

[Former Member]

Hi, i have an excel document in the server, and i want to know how to implement an action for download this file to the client machine.

if somebody can answer with an example code, much better.

thx.

[Former Member · Accepted solution]

Regards, Anilkumar

[Former Member]

I hope this code will help you in using file download element.

Create a file download element,it has a property called data bind it to a context variable say "data" of type binary.

Now we have to take the data from the server read it into a byte array and set that to the context variable "data".

//Reading file from server into a byte array "b"

try

{

File output = new File("C:
test.doc"); //"C:
test.doc" is the file in server

int length=(int)output.length();

byte b[] = new byte[length];

FileInputStream in = new FileInputStream(output);

in.read(b);

in.close();

//Setting the data from file to the context variable data

wdContext.currentContextElement().setData(b);

}

catch(Exception ex)

{

wdComponentAPI.getMessageManager().reportSuccess("Error in File IO"+ex.toString());

}

//Create the attribute info of the context variable data

IWDAttributeInfo attinfo = wdContext.getNodeInfo().getAttribute("data");

//using attribute info create a Modifiable binary type

IWDModifiableBinaryType binaryType = (IWDModifiableBinaryType)attinfo.getModifiableSimpleType();

//Set the default file name

binaryType.setFileName("test.doc");

//Explicitly specify the file type , not mandatory

binaryType.setMimeType(WDWebResourceType.DOC);

Do get back for further clarifications.

Hope this helps you.

Regards,

Vijith

[Former Member]

Hello Vijith thx a lot, i've tried just like the code that u give abobe, but it doesn't work, when i try to prove it launches a new ie with an exception like:

500 Internal Server Error

Application error occurs during processing the request.

Details: java.lang.NullPointerException

at com.sap.tc.webdynpro.clientserver.cal.ClientManager.getClientWindow(ClientManager.java:837)

at com.sap.tc.webdynpro.serverimpl.defaultimpl.DispatcherServlet.doExchangeProcessing(DispatcherServlet.java:139)

at com.sap.tc.webdynpro.serverimpl.defaultimpl.DispatcherServlet.doContent(DispatcherServlet.java:95)

at com.sap.tc.webdynpro.serverimpl.defaultimpl.DispatcherServlet.doGet(DispatcherServlet.java:35)

at javax.servlet.http.HttpServlet.service(HttpServlet.java:740)

at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)

...

I don't know what is happening, i hope u can help me...

regards.

[Former Member]

Hi Joaquin,

Check the following part of code ...

IWDAttributeInfo attinfo = wdContext.getNodeInfo().getAttribute("<attributename>");

The attribute name should be the same as the one in context.Do check that it should solve your problem.

Regards,

Vijith

[Former Member]

Hi Vijith, thx a lot for ur help, i've solved the problem of the download...

Regards.

[Former Member]

Hi Silva,

for more details about File download UI and corresponding APIs

follow this link

http://help.sap.com/saphelp_nw04/helpdata/en/c8/32cc6922fb6040a768652aaa0b6879/content.htm

Hope this helped you

Reagrds,

RK

[Former Member]

Thx Anilkumar.

As i see in the thread that you suggest me, there are no way to implement a download action easily, or there are?.

Thx.

[Former Member]

Create a FileDownload UI element and bind it to a value attribute of type binary.

In the implementation write code to read content in the file to a byte array and set it to the binary Value attribute.

Check this link which has a code snippet.

http://help.sap.com/saphelp_nw04/helpdata/en/d9/376fcad4ba354db3093f147bc3ecd2/frameset.htm

Hope this might be helpful.

Regards,

Sowjanya.

Message was edited by: Sowjanya Chintala

Message was edited by: Sowjanya Chintala