Re: MemPtrNew / MemPtrFree

Tue, 17 Feb 2004 23:47:50 -0800

put this somewhere out of the function (make it global) and declare it as external to have acces to it from everywhere:

ContextType *context;

Then in you AppStart function add this:
context=(ContextType *)MemPtrNew(sizeof(ContextType));

in AppStop add:
MemPtrFree(context);


George wrote:

Hello,

Since I'm a Palm OS newbie, I need some help.  I'm debugging an applicaiton
using the Emulator and found out that the application sometimes gets "memory
leaks" error.

Ben Combee also suggested that I should use "MemPtrNew" to decrease my stack
size in my previous thread.

So, I've decided I should take a serious look at using "MemPtrNew" and
"MemPtrFree" to make the application more efficient.

However, I don't know how to use them.

This is the existing code in my Pilot Main:

UInt32 PilotMain(UInt16 cmd, MemPtr cmdPBP, UInt16 launchFlags)
{
    ContextType context;
    UInt16  error;
    context.hasGlobals = launchFlags & sysAppLaunchFlagNewGlobals;

    if (cmd == sysAppLaunchCmdNormalLaunch)
    {   globalContext = &context;
        error = AppStart(&context);
        if (error) return error;
        FrmGotoForm(ID_FORM_LIST);
        EventLoop();
        AppStop(&context);
        return 0;
    }
    else if .... (codes snipped...)

I use ContextType to store Global variables and it's huge.  That's the
problem.  I need to free up the resources when ContextType is not used.  I
just don't quite understand how to use MemPtrNew to free the memory.

Thanks for your help in advance.

George.




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