Clearing heap and stack while writing to file

[emorgen]

Hi, I'm very new to symbian c++ (I have been using j2me a lot!) and I've been following a lot of tutorials and I'm still confused about when I need to deallocate certain objects. Here is my program. I'm trying to write the WLan mac address to a text file. And it never creates the file because of a Memory Alloc: error.

#ifdef __GCCE__
#include <staticlibinit_gcce.h>
#endif
#include <f32file.h>
#include <e32std.h>
#include "main.h"

LOCAL_C void mainL(CConsoleBase* con) {

  _LIT(KTxtHello, "Hello.\n");
  _LIT(KTxtError,"Error.\n");
  //con->Printf(KTxtHello);
  TBuf8<20> address;
  RProperty::Get(KPSUidWlan,KPSWlanMacAddress,address);
  TBuf<20> wlanMACAddress;
  for ( TInt i = 0; i < address.Length(); i++ )
      {     
      TUint16 addbyte = address[i];
      wlanMACAddress.AppendFormat(_L("%02X:"), addbyte);
      }
  if  ( wlanMACAddress.Length() ) // remove trailing ':'
      {
      wlanMACAddress.Delete(wlanMACAddress.Length()-1, 1);
      }
  
  HBufC8* hBuf = HBufC8::NewL(20);
  hBuf->Des().Copy(wlanMACAddress);
  TPtr8 myPtr = hBuf->Des();
  
  RFs fs;
  RFile file;
  fs.Connect();
  
  file.Replace(fs,_L("C:\\System\\apps\\Image\\address.txt"),EFileWrite);
  file.Write(myPtr);
    
    // add some more data, if needed
  file.Close();
  fs.Close();
    	
}

Please help me determine which objects I need to be pushing/popping/etc.

Thank you in advance.

[wizard_hu_]

You have a memory leak (the "hBuf" is not deleted), but that is all. ALLOC panic appears at the end of the execution, your file is probably created.
Note that c:\system is not shown by the built-in file manager (of the phone or the emulator), use a location under c:\Data if you want to see it.