Page 186 - PDA Robotics Using Your Personal Digital Assistant to Control Your Robot

PDA 08 5/27/03 8:47 AM Page 162
PDA Robotics
The AppStart() function reads in any saved information and initializes
the infrared libray by calling the function StartApplication, which I
should have called InitializeInfrared().
// FUNCTION: AppStart
//
// DESCRIPTION: Get the current application's preferences.
//
// RETURNED:
// errNone - if nothing went wrong
static Err AppStart(void)
{
UInt16 prefsSize;

// Read the saved preferences / saved-state information.
prefsSize = sizeof(pdarobotPreferenceType);
if (PrefGetAppPreferences(
appFileCreator, appPrefID, &g_prefs, &prefsSize, true) !=
noPreferenceFound)
{
// FIXME: setup g_prefs with default values
}

if (!StartApplication())
return 0;

return errNone;
}
The AppStop() function saves any preferences and calls
StopApplication() which shuts down the infrared communication.

// FUNCTION: AppStop
//
// DESCRIPTION: Save the current state of the application.
static void AppStop(void)
{
// Write the saved preferences / saved-state information. This
// data will be saved during a HotSync backup.
PrefSetAppPreferences(
appFileCreator, appPrefID, appPrefVersionNum,
&g_prefs, sizeof(pdarobotPreferenceType), true);
StopApplication();

// Close all the open forms.
FrmCloseAllForms();
}

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