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Text parsing for large files
| Thu, 2005-11-17 10:17 | |
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Hi... I'm back with a doubt in text parsing... I have a large file to parse which contains about 52 lines of text. THe constraints of this issue is that: 1. The size of the file is 1.5KB. 2. The delimiter in the file is : ": " (Colon and a space) 3. TBuf is not accepting size greater than 1184. Is there a way of reading the text file containing the data into a HBufC and later converting it into corresponding TBuf as the TLex class takes only TDesC, TBuf as input. How do i go about this??? The Cruise is on... |
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Check this out and please temme:
Nov 7, 2005 (Close)
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Thanx in advance...
The Cruise is on...
Forum posts: 37
A.C.C and 462.15 (-0.60%).
I want this parsing to be done for a specified number of lines, say 10 or 15 only and discard the rest of the file...
How do i go about this???
The Cruise is on...
Forum posts: 36
Forum posts: 37
Thanx...
The Cruise is on...
Forum posts: 94
Here is the sample code:
User::LeaveIfError(fsSession.Connect());
RFileReadStream readStream;
readStream.PushL();
User::LeaveIfError(readStream.Open(fsSession, KFile, EFileRead));
CLineReader* myReader = CLineReader::NewL(readStream);
TInt aPos = 0;
TInt aErr = 0;
while(aErr!=KErrEof)
{
myReader->ReadLineL(aPos, aErr);
// Do your parsing here ..
}
CleanupStack::PopAndDestroy();
Vivek
Vivek Chopra
Forum posts: 78
Minor comment: Symbian stack size is quite limited and call stack uses the same space, that variables stack. If you allocate A LOT of things on the stack at some point your program might start mysteriously fail again and again. Just when you try to call some function, you always used without problem.
These stack overflow bugs are rather difficult to debug. So as a rule of thumb allocate everything you can on the heap.
Of course, it doesn't mean that you HAVE to do it. It is ok to allocate ints, handles or small structs on the stack, but kilobyte-sized things should be on the heap.
Compilable Symbian Code Examples
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Forum posts: 2
I am trying to use the given code example to read a text file and my application is crashing at:
CLineReader* myReader = CLineReader::NewL(readStream);
can you please help?
Thanks in advance,
Regards,
Angela
Forum posts: 364
I'm back with a doubt in text parsing... I have a large file to parse which contains about 52 lines of text.
THe constraints of this issue is that:
1. The size of the file is 1.5KB.
2. The delimiter in the file is : ": " (Colon and a space)
3. TBuf is not accepting size greater than 1184.
Is there a way of reading the text file containing the data into a HBufC and later converting it into corresponding TBuf as the TLex class takes only TDesC, TBuf as input. How do i go about this???
Look at the descriptor class hierarcy, a TBuf and a HBufC are both TDesCs.
Forum posts: 7
You can also use TFileText to read on line at a time..
Best of luck..
Forum posts: 131
Forum posts: 364