Read from a text file

[razas]

Hi !

In my program I use the following code to write to a text file :

void CMyAppContainer::OnJPEGViewCommand(TInt aCommand)
{

 RFs fs;
 fs.Connect();

 RFile myfile;
 myfile.Replace(fs,_L("c:\\system\\apps\\format.txt"),EFileWrite); 
     

 TBuf8<10> data; //data contains the required format

 data.Copy(_L("JPEG"));

 myfile.Write(data);

 myfile.Close();
 fs.Close();

}

The above code gets executed when the JPEG menu option is selected. In addition to JPEG ,i also have similar code for other image formats like GIF,PNG,TIFF etc..
So basically what happens is when the user selects a particular format from a menu that format gets written to a text file.
Now what I would like to do is read that text from the text file and take appropriate actions based on the format read.
The following pseudocode may help in clarifying what I need to do :


switch(<format>)
{
case "JPEG " :

//do something for JPEG

break ;

case "GIF"

//do something for GIF

break ;

....
....

default :

break ;

}

Being a symbian newbie I am facing difficulty in reading from the file. So, id appreciate it if u could show me how reading from the format.txt file and using the format in a switch block could be implemented.

Thanks a lot

[eswar_illuri]

hi,

I think you need to read from the jpeg file and write it into a text file.

//Code

RFs iSession;
RFile iFileIn,iFileOut;
iSession.Connect();
iFileOut.Open(fs,_L("c:\\system\\apps\\format.txt"),EFileRead);
TInt size;
iFileOut.Size(size);

HBufC8 *iBuf=HBufC8::NewL(size);

iFileOut.Read(fs,iBuf->Des())

Now JPEG comes into iBuf.

[razas]

Hi ! Eswar ,

Thanks a lot for replying .After I posted the problem I tried a few things and actually got it to work by using a different approach that involves using a TBuf instead of HBufC that you have used.
My code is as follows :

RFs sessionhandle ;

RFile file ;

User::LeaveIfError(sessionHandle.Connect());

_LIT(KFile,"c:\\system\\apps\\format.txt");

TBuf8 <30> buf ; //**********Using a TBuf8**********

User::LeaveIfError(file.Open(sessionHandle,KFile,EFileRead));

//Read the text into a buffer

User::LeaveIfError(file.Read(buf)); //buf now contains the text from the file

file.Close();
sessionHandle.Close();

I then use the Compare() function to compare the string read with a predefined value .

Again, thanks for showing me another way to make it work

[rk.sunnam]

Hi razas,

I m new to Symbian Devlopment,

after placeing the code i m getting error:

"undefined identifier 'sessionHandle'"

Please help me regarding this.


Regards,
Rama Krishna

[vineet.jain]

you need to include f32file.h in your cpp file