Is it legal to call the MemHandleToLocalID() function on a chunk in the
dynamic heap (as opposed to data storage)? I have an application that does
this, but it now gets a warning in the emulator when running the PalmOS 3.3
debug ROMs: "MemHandleToLocalID: handle not in storage heap". I do not get
this warning when running the PalmOS 3.0 ROM.
What's even more interesting is that when I call MemLocalIDToGlobal() on
the returned local ID, I don't get the original handle back using the
Palm III 3.3 ROM. However, the Palm IIIx-V 3.3. ROM does return the original
handle.
I included the source code for a small test case below. When I run this
program on OS 3.0 or the Palm V 3.3, I see something like the following:
Memory handle = 0x800014A8
Local ID = 0xF00014A9
Local ID handle = 0x800014A8
However, when I run it on Palm III 3.3, I get:
Memory handle = 0x800015DC
Local ID = 0x000015DD
Local ID handle = 0x900015DC
If I try to use the handle returned from MemLocalIDToGlobal (0x900015DC),
it blows up with an "Invalid handle" error. Am I doing something stupid or
unsafe here or is this an OS bug?
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#include <Pilot.h>
#include <SysEvtMgr.h>
#ifdef __GNUC__
#include "callback.h"
#endif
void MemHandleTest()
{
FormPtr form;
VoidHand newHandle, origHandle;
LocalID localID;
Char string[100];
form = FrmNewForm(1000, "MemHandle test", 0, 0, 160, 160, false, 0, 0, 0);
ErrFatalDisplayIf(form == NULL, "Could not create form");
FrmDrawForm(form);
origHandle = MemHandleNew(sizeof(Long));
ErrFatalDisplayIf(origHandle == NULL, "Could not alloc handle");
StrPrintF(string, "Memory handle = 0x%lx", origHandle);
WinDrawChars(string, StrLen(string), 0, 20);
localID = MemHandleToLocalID(origHandle);
StrPrintF(string, "Local ID = 0x%lx", localID);
WinDrawChars(string, StrLen(string), 0, 40);
newHandle = MemLocalIDToGlobal(localID, 0);
StrPrintF(string, "Local ID handle = 0x%lx", newHandle);
WinDrawChars(string, StrLen(string), 0, 60);
MemHandleFree(origHandle);
}
DWord PilotMain(Word cmd, Ptr cmdPBP, Word launchFlags)
{
EventType event;
#ifdef __GNUC__
CALLBACK_PROLOGUE
#endif
switch (cmd) {
case sysAppLaunchCmdNormalLaunch:
MemHandleTest();
do {
EvtGetEvent(&event, evtWaitForever);
if (! SysHandleEvent(&event))
FrmDispatchEvent(&event);
}
while (event.eType != appStopEvent);
FrmCloseAllForms();
break;
}
#ifdef __GNUC__
CALLBACK_EPILOGUE
#endif
return 0;
}
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Thanks,
John Ludwig
[EMAIL PROTECTED]
