How to download a file using HTTP using Symbian C++
The following article shows how to use the HTTP Client to download and store a file on the device.
Before the transaction
The file download can be initiated using the GET Method of the HTTP Client. But to store the file being downloaded the following needs to be done: (in the get method itself)
- Create a file on the device.
if (err==KErrNotFound) // file does not exist - create it
once created the file contents are appended as the download happens.
- Initiate the transaction for the file to download
A file download can happen as a GET to a particular URL, e.g. http://www.foo.com/myfile.xml, here the file to download is myfile.xml. This file will downloaded and stored as default.xml in our example.
During the transaction
Once the GET has started use the following code in MHFRunL to store the file
// Get text of response body
MHTTPDataSupplier* dataSupplier = aTransaction.Response().Body();
iRFileObj.Write(ptr); //save the file being downloaded
HBufC* buf = HBufC::NewLC(ptr.Length());
iResponseBuffer = buf->AllocL();
iResponseBuffer = iResponseBuffer->ReAllocL(iResponseBuffer->Length()+buf->Length());
// Release buf
// Release the body data
Now the file has been stored and can be accessed at "C:\\mytempfiles\\default.xml"