Using gzip functionality

Thu, 2005-07-14 15:29

Joined: 2004-06-29
Forum posts: 109

Hi all,

like some fellows before me I do want to inflate a gzip'ed file on the
phone. How can I do this? There are few resources on the net - however I
have created the following piece of code that compiles and executes
fine. It simply does not create any output...

8<---------------------------------------------
RFs fs;

User :: LeaveIfError (fs.Connect());
CleanupClosePushL(fs);

RFile output;
output.Open(fs,
_L("c:\\test.zipx"),EFileRead|EFileWrite|EFileShareAny|EFileStreamText);

CEZGZipToFile*gzipConverter ;
gzipConverter = CEZGZipToFile::NewL(fs, _L("c:\\test.zip"), output);
gzipConverter->InflateL();

delete gzipConverter;
gzipConverter = NULL;

output.Close();

CleanupStack::PopAndDestroy(&fs);

8<---------------------------------------------

Since the CEZGZipToFile class is not documented, I have no idea whether
my usage is right or wrong.

Does anybody do gzip deflating with success? Maybe with some other
technique?

Any help would be very kind!
Thank you, Marcel

- Report To Moderator -

Thu, 2005-07-21 16:24

as1

Joined: 2005-01-22
Forum posts: 60

Hi
Your usage is correct

But there is another thing gzipConverter->InflateL(); will decopress only first block of your file you must decompress all file and use
while( gzipConverter->InflateL()){}; or something.

I've tried to modify your code to this:

RFile output;
output.Open(fs,
aDestination,EFileRead|EFileWrite|EFileShareAny|EFileStreamText);

CEZGZipToFile*gzipConverter ;
gzipConverter = CEZGZipToFile::NewL(fs,aSource, output);
while( gzipConverter->InflateL()){};
delete gzipConverter;
gzipConverter = NULL;
output.Close();

and it's working !!!

Defalting works the same as Inflating just switch output and input

algis

- Report To Moderator -

Mon, 2005-07-25 08:32
suterma Joined: 2004-06-29 Forum posts: 109	Hi algis, Yeah, you are right. There must be that while thing! With that, it works here too! Why they do not document such things???!! br, Marcel - Report To Moderator -

Tue, 2007-09-25 11:48

jayakumar

Joined: 2007-09-24
Forum posts: 2

I have this function in one of my project , got from a web site. But not working. Please Help!!

void DeCompressAFile(TDesC& aSrcName, TDesC& aDstName)
{
TBuf8<256> msg8;TBuf<256> msg16;

RFs fs;User::LeaveIfError(fs.Connect());
fs.SetSessionPath(_L("C:\\")); // change to your req. Path
RFile file;
TInt err = file.Open(fs,aDstName,EFileRead);

if(err != KErrNone)
{
msg8.Format(_L8("Error Reading File"));
msg16.Copy(msg8);
ERRDLG(msg16);
return;
}
msg8.Format(_L8("Before"));
msg16.Copy(msg8);
ERRDLG(msg16);

CEZGZipToFile *zip = CEZGZipToFile::NewLC(fs, aSrcName, file); //The function stops here witout crash and returns.

msg8.Format(_L8("CEZGZipToFile::before loop"));
msg16.Copy(msg8);
ERRDLG(msg16);

TInt tempi = 0;
while(zip->InflateL()) // while loop req. donot remove
{
tempi++;
}

msg8.Format(_L8("Completed"));
msg16.Copy(msg8);
ERRDLG(msg16);

CleanupStack::PopAndDestroy(); // zip
file.Close();
fs.Close();
}

- Report To Moderator -