Extract portion of hbuc8

[alessandropavino]

hi,

I have a problem extracting some byte from an HBufC8 buffer.

when i call "mybuffer->mid(2,1)" my appl crash!!!!!!!!!!
ps. i use series 60 emulator for 6630

the code:
...
HBufC8* iBuffer2 = HBufC8::NewL(333);
TPtr8 auxPtr(( TUint8* )iBuffer2->Des().Ptr(), 332);
iBufferPtr.Set( auxPtr );
iSocket.RecvFrom( iBufferPtr ,remoteAddress,0,iStatus);

TPtrC8 ptr = buffer->Mid(2,1);
TUint tmpInt;
TLex8 lex(ptr);
lex.Val(tmpInt); // tmpInt is now 123

m.AppendNum(tmpInt);
m.Append("some text");
ShowMessage(m, ETrue); //other function
...

tanks

[alessandropavino]

HBufC8* buffer = HBufC8::NewL(333);
TPtr8 auxPtr(( TUint8* )buffer->Des().Ptr(), 332);
iBufferPtr.Set( auxPtr );
iSocket.RecvFrom( iBufferPtr ,remoteAddress,0,iStatus);

TPtrC8 ptr = buffer->Mid(2,1);
TUint tmpInt;
TLex8 lex(ptr);
lex.Val(tmpInt); // tmpInt is now 123

m.AppendNum(tmpInt);
m.Append("some text");
ShowMessage(m, ETrue); //other functio

[anttij]

After

iSocket.RecvFrom( iBufferPtr ,remoteAddress,0,iStatus);

You should wait for the async request to end before trying to read the buffer. Now you do not wait but continue directly to handling the buffer, even though nothing has been received. Either put all thisn inside an active object or call User::WaitForRequest after calling RecvFrom. If you use the AO way, make sure anything you pass to async methods is a member variable, not an automatic variable.

Furthermore, you do not check how much data was actually received.