How to read text file line by line?

[aluzi]

File is create with RFile.Write() function, it's content is plain text. I want to read this file line by line, just like a "StreamReader.ReadLine()" funtion in C#. But RFile class does not offers such function....

[Tatavarthi]

Hope this will helps you!

_LIT(KFileSpec,"C:\\Test.txt");
RFs fs;
User::LeaveIfError(fs.Connect());
CleanupClosePushL(fs);

RFile ifile;
TInt iErr1=file.Open(fs,KFileSpec,EFileRead);
if(iErr1==KErrNone)
{
TInt iSize;
file.Size(iSize);
HBufC8* buffer = HBufC8::NewLC(iSize);
TPtr8 ptr= buffer->Des();
file.Read(ptr);
file.Close();
CleanupStack::PopAndDestroy(buffer);
}
fs.Close();
CleanupStack::PopAndDestroy(&fs);

And if u want read through TFileText class then chk this link..
http://wiki.forum.nokia.com/index.ph...ead_a_CSV_file

[ltomuta]

Look for TFileText in SDKs docs. Mind you that the line length is restricted to 256 characters.

[aluzi]

Hope this will helps you!

_LIT(KFileSpec,"C:\\Test.txt");
RFs fs;
User::LeaveIfError(fs.Connect());
CleanupClosePushL(fs);

RFile ifile;
TInt iErr1=file.Open(fs,KFileSpec,EFileRead);
if(iErr1==KErrNone)
{
TInt iSize;
file.Size(iSize);
HBufC8* buffer = HBufC8::NewLC(iSize);
TPtr8 ptr= buffer->Des();
file.Read(ptr);
file.Close();
CleanupStack::PopAndDestroy(buffer);
}
fs.Close();
CleanupStack::PopAndDestroy(&fs);

And if u want read through TFileText class then chk this link..
http://wiki.forum.nokia.com/index.ph...ead_a_CSV_file

But if my text file very large, HBufC8* buffer = HBufC8::NewLC(iSize) still can work?

[Nitesh Bhardwaj]

But if my text file very large, HBufC8* buffer = HBufC8::NewLC(iSize) still can work?

yes it ll work.

[Tatavarthi]

But if my text file very large, HBufC8* buffer = HBufC8::NewLC(iSize) still can work?

Yes i think it should work!
Myself i used it with around 1 MB JPEG image which is in text form.

-Regards,
Pavan

[aluzi]

Look for TFileText in SDKs docs. Mind you that the line length is restricted to 256 characters.

Thanks! I try it and it really wotk.

Another question, I write some CHINESE string to file using TFileText.Write(), And then I TFileText.Read() this string and display using iEikonEnv->InfoMsg(), the CHINESE string can display correctlly. But when I open the file in Windows Explorder using notepad, I can't read it's contents at all!

[szhkazmi]

im trying to open file but it is not working, there is some unhandled exception in the TRAPD, here is my code please tell me whats the problem with it:

void CompressImage::Compress( const TDesC& aFilePath )
{

TInt FileSize;
RFs ServerObj;
ServerObj.Connect();

TRAPD(error, iFile.Open( ServerObj, aFilePath, EFileRead) );

if(error!=KErrNone)
{
CAknInformationNote* informationNote = new (ELeave) CAknInformationNote;
TBuf<100> msg;
msg.AppendNum(error);
informationNote->ExecuteLD(msg);
}

iFile.Size( FileSize );

HBufC8* newbuff;
HBufC8* buff = NULL;
buff = HBufC8::NewL( FileSize );
TBuf8<256> t1;
TBuf8<256> t2;

iFile.Read( t1 );
CExifModify* ExifObj = CExifModify::NewL( t1 );
ExifObj->SetXResolutionL( 10, 10 );
ExifObj->SetYResolutionL( 20, 20 );

newbuff = ExifObj->WriteDataL( t2 );
iFile.Create( ServerObj, _L("c:\\Data\\Images\\BlueFlower.bmp"), EFileWrite );
iFile.Write( *newbuff );
iFile.Close();

iReader->NewL();
iReader->PrepareImageL( aFilePath );
iReader->Bitmap();
iCompressed = ETrue;
};

[wizard_hu_]

First of all, RFile::Open is not "OpenL", thus TRAP/D does not do anything to it. Try

TInt error=iFile.Open(...);

[szhkazmi]

i have tried;
TInt error = iFile.Open( ServerObj, aFilePath, EFileRead);

here is my code:
TInt FileSize;
RFs ServerObj;
ServerObj.Connect();

TBuf<100> msg;
CAknInformationNote* informationNote = new (ELeave) CAknInformationNote;
informationNote->ExecuteLD( aFilePath );

TInt error = iFile.Open( ServerObj, aFilePath, EFileRead);
msg.Num(error);
informationNote->ExecuteLD(msg);
......................................................

But is still it is not working, neither the error value is getting displayed.

[wizard_hu_]

If you want to have the error code displayed, use

User::LeaveIfError(iFile.Open( ServerObj, aFilePath, EFileRead));

[szhkazmi]

Thank you for being so helpful! now im trying to change the resolution of .jpg file, everything is working fine but the application gets closed at this line"CExifModify* ExifObj = CExifModify::NewL( t1 );" , here is my code;

TInt FileSize;
RFs ServerObj;
ServerObj.Connect();
RFile zf1;
zf1.Open( ServerObj, aFileName, EFileRead);
zf1.Size( FileSize );
HBufC8* newbuff;
HBufC8* buff = NULL;
buff = HBufC8::NewL( FileSize );

TBuf8<7567> t1;
zf1.Read( t1 );
/* here */
CExifModify* ExifObj = CExifModify::NewL( t1 );
ExifObj->SetXResolutionL( 10, 10 ); ExifObj->SetYResolutionL( 20, 20 );
newbuff = ExifObj->WriteDataL( t1 );

zf1.Close();
zf1.Create( ServerObj, _L("c:\\Data\\Images\\myfile.jpg"), EFileWrite ); //Replacing the file
zf1.Write( *newbuff );
zf1.Close();
ServerObj.Close();


thanks again!!!

[wizard_hu_]

Have you enabled extended panic codes? http://wiki.forum.nokia.com/index.ph...ded_panic_code