Chapter 1

CleanupStack::PushL(fileName);
// Check it's a valid filename
if(!iCoeEnv->FsSession().IsValidName(*fileName))
{
TryChangeFocusToL(EExampleControlIdFileName);
iEikonEnv->LeaveWithInfoMsg(R_EIK_TBUF_INVALID_FILE_NAME);
}
// Check whether it's going to be possible to create the file
for reading
RFile file;
User::LeaveIfError(file.Open(iCoeEnv->FsSession(), *fileName,
EFileRead));
file.Close();
// Finished with user interaction: communicate parameters
and return
delete iAppUi->iFileName;
iAppUi->iFileName = fileName;
CleanupStack::Pop(); // fileName
return ETrue;
}
As before, the job of OkToExitL() is to check that the user's input is sensible. This function
checks:
� that a filename has been specified,
� that the filename is valid,
� that it's going to be possible to read the file: I use RFile::Open()for this and leave if
there was any error.
Assuming all is well, control returns to my command handler that processes it using:
void CExampleAppUi::CmdReadFileL()
{
...
// Create a read stream on the file
RFileReadStream reader;
reader.PushL();
// Reader on cleanup stack
User::LeaveIfError(reader.Open(iCoeEnv->FsSession(),
*iFileName,
EFileRead));
// Read the text
HBufC* string = HBufC::NewL(reader, 10000);
delete iText;
iText = string;