Reading a file..

[deepchand86]

Hai ppl...

I am trying to read an Xml file.
I hav been using RFileReadstream along with RFile.

Bt the thing is i want the whole contents of the file in
a single buffer(HBufC*)..i.e in a single read i should be able to extract the contents of the file without any looping,etc...

Could anyone suggest me what to do????

[symbianyucca]

And how did you try it earlier, and what actually went wrong with that approacj ?

[kkrish]

Hi,

You can use the following method. Here is the link

or you can also use CParser to parse xml

[rkmohanty]

This link may help you, try it out

http://wiki.forum.nokia.com/index.ph..._CParser_class

[deepchand86]

Consider the following code....

TInt iSize = read.Source()->SizeL();
HBufC* buf = HBufC::NewL(read, iSize) ;
TPtr16 pBuf = buf->Des() ;
read >> pBuf;

On execution....
I m able to get the file size i.e iSize correctly(27 KB).
In the next line i have passed it as a parameter...

But when checked buf consisted only of 15 characters..It is reading only a little..and also the consecutive code too..
Rather than going for loops can't i read it as a whole...

[deepchand86]

No..No...
Consider the case of text file itself...
Don't specialize for xml file..

[kkrish]

Consider the following code....

TInt iSize = read.Source()->SizeL();
HBufC* buf = HBufC::NewL(read, iSize) ;
TPtr16 pBuf = buf->Des() ;
read >> pBuf;

On execution....
I m able to get the file size i.e iSize correctly(27 KB).
In the next line i have passed it as a parameter...

But when checked buf consisted only of 15 characters..It is reading only a little..and also the consecutive code too..
Rather than going for loops can't i read it as a whole...

Hi,

Not getting you exactly what you are trying to say. are you not able to read all the content of the file so just increase the file size let suppose make it double by multiply 2.

[deepchand86]

No kkrish..

I will be able to read the file if i construct a loop and use the above code...

But my question is why can't i read it in a single call
to HBufC constructor whose second argument is the file size i m going to read... But it is not reading the whole contents into the buffer...

It's only reading a little into the buffer...
Hope U Understand this....

[Kavit Patel]

Hi Deep,

TInt iSize = read.Source()->SizeL();

What is your "read" here?

Also you can take the file size by using RFile::Size() method.

Regards,
Kavit.

[rkmohanty]

try to use this one by using RFile object
TInt Read(TDes8 &aDes) const;

you can read whole content of a file at a time into your TDes8 type object.

[deepchand86]

k mohanty...

But while creating an TDes8 object..i need to mention the size..
Am i right...

Consider the case in which i m not sure abt the file size...
Eventhough i get the Filesize...
How do i create a Descriptor with that filesize dynamically???

[Kavit Patel]

For dynamic size you must have to use heap descriptors.
That is HBuC.
And you can get the file size as I mentioned above.
This size can be used as the size parameter to create the heap descriptor.

Regards,
Kavit.

[rkmohanty]

Ya kavit is right.
you go with him , you'll get result.

[deepchand86]

RFile myfile;
RFs fss;
User::LeaveIfError(fss.Connect());
CleanupClosePushL(fss);
User::LeaveIfError(myfile.Open(fss,KMyFile,EFileShareExclusive|EFileRead ));
TInt size ;
myfile.Size(size);


HBufC8* buf = HBufC8::NewL(size) ;
TPtr8 pBuf = buf->Des();
myfile.Read(pBuf);


I m using the above code to read the file.
But it is aborting(No source available..) on the last line in the debug mode....
(Read operation)....Any thing wrong in the above code...

[rkmohanty]

RFile myfile;
RFs fss;
User::LeaveIfError(fss.Connect());
CleanupClosePushL(fss);
User::LeaveIfError(myfile.Open(fss,KMyFile,EFileShareExclusive|EFileRead ));
TInt size ;
myfile.Size(size);


HBufC8* buf = HBufC8::NewL(size) ;
TPtr8 pBuf = buf->Des();
myfile.Read(pBuf);


I m using the above code to read the file.
But it is aborting(No source available..) on the last line in the debug mode....
(Read operation)....Any thing wrong in the above code...

you are correct in code, its running perfect for me.
KMyFile is the path where your file exist,
you check that path file is there or not