I have a simple test program ( see posting below) where I take two numeric
decimal fields and try to multiply their values and show the results on the
next form. I keep getting the same resulting value of 4.0000267e
Any help would be great
Here is the code
/******************************************************************************
*
* Copyright (c) 1999-2004 PalmSource, Inc. All rights reserved.
*
* File: AppMain.c
*
*****************************************************************************/
#include <PalmOS.h>
//#include "AppResources.h"
#include "../rsc/AppResources.h"
#include "../rsc/MathLib.h"
/***********************************************************************
*
* Entry Points
*
***********************************************************************/
FieldType* field;
Int32 index;
MemHandle htext;
char *ptext;
RectangleType theRect;
FlpCompDouble theCompFloat;
char theString[80];
float theFloat1, theFloat2;
/***********************************************************************
*
* Internal Constants
*
***********************************************************************/
#define appFileCreator 'frm1' // register your own at
http://www.palmos.com/dev/creatorid/
#define appVersionNum 0x01
#define appPrefID 0x00
#define appPrefVersionNum 0x01
/***********************************************************************
*
* Internal Functions
*
***********************************************************************/
/***********************************************************************
*
* FUNCTION: MainFormDoCommand
*
* DESCRIPTION: This routine performs the menu command specified.
*
* PARAMETERS: command - menu item id
*
* RETURNED: nothing
*
* REVISION HISTORY:
*
*
***********************************************************************/
/*static Boolean MainFormDoCommand(UInt16 command)
{
Boolean handled = false;
FormType * pForm;
switch (command) {
case MainOptionsAboutStarterApp:
pForm = FrmInitForm(AboutForm);
FrmDoDialog(pForm);
// Display the About Box.
FrmDeleteForm(pForm);
handled = true;
break;
}
return handled;
}
*/
/***********************************************************************
*
* FUNCTION: MainFormHandleEvent
*
* DESCRIPTION: This routine is the event handler for the
* "MainForm" of this application.
*
* PARAMETERS: pEvent - a pointer to an EventType structure
*
* RETURNED: true if the event has handle and should not be passed
* to a higher level handler.
*
* REVISION HISTORY:
*
*
***********************************************************************/
static Boolean MainFormHandleEvent(EventType* pEvent)
{
Boolean handled = false;
FormType* pForm;
switch (pEvent->eType) {
case menuEvent:
//return MainFormDoCommand(pEvent->data.menu.itemID);
case ctlSelectEvent:
if (pEvent->data.ctlSelect.controlID ==
kMainFormOKButton)
{
pForm = FrmGetActiveForm();
// get an index to the first text field
index = FrmGetObjectIndex(pForm,kMainFormFirstValueTxtField);
// get the pointer to our field
field = FrmGetObjectPtr(pForm, index);
// Convert a string to a float
theCompFloat.fd = FlpAToF(FldGetTextPtr(field) );
theFloat1 = theCompFloat.d;
// get an index to the second text field
index = FrmGetObjectIndex(pForm,kMainFormSecondValueTxtField);
// get the pointer to our field
field = FrmGetObjectPtr(pForm, index);
// Convert second string to a float
theCompFloat.fd = FlpAToF(FldGetTextPtr(field) );
theFloat2 = theCompFloat.d;
FrmGotoForm(kResultsForm);
FrmHandleEvent(FrmGetActiveForm(), pEvent);
handled = true;
break;
}
case frmOpenEvent:
pForm = FrmGetActiveForm();
// allocate our field chunk
htext = MemHandleNew(81);
if(htext == NULL)
return(0);
////////////////////////////////////
// set first text fields value
//////////////////////////////////
// lock the memory, get the pointer
ptext = MemHandleLock(htext);
// put some text in the field
StrCopy(ptext, "hello");
// unlock the fields memory
MemHandleUnlock(htext);
// get an index to the first text field
index = FrmGetObjectIndex(pForm,kMainFormFirstValueTxtField);
// get the pointer to our field
field = FrmGetObjectPtr(pForm, index);
// set the text
FldSetTextHandle(field, htext);
// set focus on the intial text field
FrmSetFocus(pForm, index);
///////////////////////////////////////
// set second text fields value
///////////////////////////////////
// allocate our field chunk
htext = MemHandleNew(81);
if(htext == NULL)
return(0);
// lock the memory, get the pointer
ptext = MemHandleLock(htext);
// put some text in the field
StrCopy(ptext, "world");
// unlock the fields memory
MemHandleUnlock(htext);
// get an index to the second text field
index = FrmGetObjectIndex(pForm,kMainFormSecondValueTxtField);
// get the pointer to our field
field = FrmGetObjectPtr(pForm, index);
// set the text
FldSetTextHandle(field, htext);
FrmDrawForm(pForm);
handled = true;
break;
default:
break;
}
return handled;
}
static Boolean ResultsFormHandleEvent(EventType* pEvent)
{
Boolean handled = false;
FormType* pForm;
switch (pEvent->eType) {
case menuEvent:
//return MainFormDoCommand(pEvent->data.menu.itemID);
case ctlSelectEvent:
if (pEvent->data.ctlSelect.controlID ==
kResultsFormBackButton)
{
FrmGotoForm(kMainForm);
FrmHandleEvent(FrmGetActiveForm(), pEvent);
handled = true;
break;
}
case frmOpenEvent:
pForm = FrmGetActiveForm();
// Convert a float to a string
theCompFloat.d = theFloat1 * theFloat2;
FlpFToA( theCompFloat.fd, theString );
////////////////////////////////////
// set results text field value
//////////////////////////////////
// allocate our field chunk
htext = MemHandleNew(81);
if(htext == NULL)
return(0);
// lock the memory, get the pointer
ptext = MemHandleLock(htext);
// put some text in the field
StrCopy(ptext, theString);
//resize field
MemHandleResize(htext, StrLen(ptext)+1);
// unlock the fields memory
MemHandleUnlock(htext);
// get an index to the first text field
index = FrmGetObjectIndex(pForm,kResultsFormResultsTxtField);
// get the pointer to our field
field = FrmGetObjectPtr(pForm, index);
// set the text
FldSetTextHandle(field, htext);
// set focus on the intial text field
FrmSetFocus(pForm, index);
FrmDrawForm(pForm);
handled = true;
break;
default:
break;
}
return handled;
}
/***********************************************************************
*
* FUNCTION: AppHandleEvent
*
* DESCRIPTION: This routine loads form resources and set the event
* handler for the form loaded.
*
* PARAMETERS: event - a pointer to an EventType structure
*
* RETURNED: true if the event has handle and should not be passed
* to a higher level handler.
*
* REVISION HISTORY:
*
*
***********************************************************************/
static Boolean AppHandleEvent(EventType* pEvent)
{
UInt16 formId;
FormType* pForm;
Boolean handled = false;
if (pEvent->eType == frmLoadEvent) {
// Load the form resource.
formId = pEvent->data.frmLoad.formID;
pForm = FrmInitForm(formId);
FrmSetActiveForm(pForm);
// Set the event handler for the form. The handler of the
currently
// active form is called by FrmHandleEvent each time is
receives an
// event.
switch (formId) {
case kMainForm:
FrmSetEventHandler(pForm, MainFormHandleEvent);
break;
case kResultsForm:
FrmSetEventHandler(pForm,
ResultsFormHandleEvent);
break;
default:
break;
}
handled = true;
}
return handled;
}
/***********************************************************************
*
* FUNCTION: AppStart
*
* DESCRIPTION: Get the current application's preferences.
*
* PARAMETERS: nothing
*
* RETURNED: Err value errNone if nothing went wrong
*
* REVISION HISTORY:
*
*
***********************************************************************/
static Err AppStart(void)
{
FrmGotoForm(kMainForm);
return errNone;
}
/***********************************************************************
*
* FUNCTION: AppStop
*
* DESCRIPTION: Save the current state of the application.
*
* PARAMETERS: nothing
*
* RETURNED: nothing
*
* REVISION HISTORY:
*
*
***********************************************************************/
static void AppStop(void)
{
// Close all the open forms.
FrmCloseAllForms();
}
/***********************************************************************
*
* FUNCTION: AppEventLoop
*
* DESCRIPTION: This routine is the event loop for the application.
*
* PARAMETERS: nothing
*
* RETURNED: nothing
*
* REVISION HISTORY:
*
*
***********************************************************************/
static void AppEventLoop(void)
{
Err error;
EventType event;
do {
EvtGetEvent(&event, evtWaitForever);
if (SysHandleEvent(&event))
continue;
if (MenuHandleEvent(0, &event, &error))
continue;
if (AppHandleEvent(&event))
continue;
FrmDispatchEvent(&event);
} while (event.eType != appStopEvent);
}
/***********************************************************************
*
* FUNCTION: PilotMain
*
* DESCRIPTION: This is the main entry point for the application.
*
* PARAMETERS: cmd - word value specifying the launch code.
* cmdPB - pointer to a structure that is associated with the
launch code.
* launchFlags - word value providing extra information about the
launch.
* RETURNED: Result of launch
*
* REVISION HISTORY:
*
*
***********************************************************************/
UInt32 PilotMain(UInt16 cmd, MemPtr cmdPBP, UInt16 launchFlags)
{
Err error = errNone;
//Err error1;
switch (cmd) {
case sysAppLaunchCmdNormalLaunch:
if ((error = AppStart()) == 0) {
// make sure MathLib is on the PDA
/*error = SysLibFind(MathLibName, &MathLibRef);
if (error)
error = SysLibLoad(LibType, MathLibCreator, &MathLibRef);
ErrFatalDisplayIf(error, "Can't find MathLib"); // Just an
example; handle it gracefully
error = MathLibOpen(MathLibRef, MathLibVersion);
ErrFatalDisplayIf(error, "Can't open MathLib");
*/
AppEventLoop();
AppStop();
}
break;
default:
break;
}
return error;
}
--
For information on using the PalmSource Developer Forums, or to unsubscribe,
please see http://www.palmos.com/dev/support/forums//******************************************************************************
*
* Copyright (c) 1999-2004 PalmSource, Inc. All rights reserved.
*
* File: AppMain.c
*
*****************************************************************************/
#include <PalmOS.h>
//#include "AppResources.h"
#include "../rsc/AppResources.h"
#include "../rsc/MathLib.h"
/***********************************************************************
*
* Entry Points
*
***********************************************************************/
FieldType* field;
Int32 index;
MemHandle htext;
char *ptext;
RectangleType theRect;
FlpCompDouble theCompFloat;
char theString[80];
float theFloat1, theFloat2;
/***********************************************************************
*
* Internal Constants
*
***********************************************************************/
#define appFileCreator 'frm1' // register your own at
http://www.palmos.com/dev/creatorid/
#define appVersionNum 0x01
#define appPrefID 0x00
#define appPrefVersionNum 0x01
/***********************************************************************
*
* Internal Functions
*
***********************************************************************/
/***********************************************************************
*
* FUNCTION: MainFormDoCommand
*
* DESCRIPTION: This routine performs the menu command specified.
*
* PARAMETERS: command - menu item id
*
* RETURNED: nothing
*
* REVISION HISTORY:
*
*
***********************************************************************/
/*static Boolean MainFormDoCommand(UInt16 command)
{
Boolean handled = false;
FormType * pForm;
switch (command) {
case MainOptionsAboutStarterApp:
pForm = FrmInitForm(AboutForm);
FrmDoDialog(pForm);
// Display the About Box.
FrmDeleteForm(pForm);
handled = true;
break;
}
return handled;
}
*/
/***********************************************************************
*
* FUNCTION: MainFormHandleEvent
*
* DESCRIPTION: This routine is the event handler for the
* "MainForm" of this application.
*
* PARAMETERS: pEvent - a pointer to an EventType structure
*
* RETURNED: true if the event has handle and should not be passed
* to a higher level handler.
*
* REVISION HISTORY:
*
*
***********************************************************************/
static Boolean MainFormHandleEvent(EventType* pEvent)
{
Boolean handled = false;
FormType* pForm;
switch (pEvent->eType) {
case menuEvent:
//return MainFormDoCommand(pEvent->data.menu.itemID);
case ctlSelectEvent:
if (pEvent->data.ctlSelect.controlID ==
kMainFormOKButton)
{
pForm = FrmGetActiveForm();
// get an index to the first text field
index = FrmGetObjectIndex(pForm,kMainFormFirstValueTxtField);
// get the pointer to our field
field = FrmGetObjectPtr(pForm, index);
// Convert a string to a float
theCompFloat.fd = FlpAToF(FldGetTextPtr(field) );
theFloat1 = theCompFloat.d;
// get an index to the second text field
index = FrmGetObjectIndex(pForm,kMainFormSecondValueTxtField);
// get the pointer to our field
field = FrmGetObjectPtr(pForm, index);
// Convert second string to a float
theCompFloat.fd = FlpAToF(FldGetTextPtr(field) );
theFloat2 = theCompFloat.d;
FrmGotoForm(kResultsForm);
FrmHandleEvent(FrmGetActiveForm(), pEvent);
handled = true;
break;
}
case frmOpenEvent:
pForm = FrmGetActiveForm();
// allocate our field chunk
htext = MemHandleNew(81);
if(htext == NULL)
return(0);
////////////////////////////////////
// set first text fields value
//////////////////////////////////
// lock the memory, get the pointer
ptext = MemHandleLock(htext);
// put some text in the field
StrCopy(ptext, "hello");
// unlock the fields memory
MemHandleUnlock(htext);
// get an index to the first text field
index = FrmGetObjectIndex(pForm,kMainFormFirstValueTxtField);
// get the pointer to our field
field = FrmGetObjectPtr(pForm, index);
// set the text
FldSetTextHandle(field, htext);
// set focus on the intial text field
FrmSetFocus(pForm, index);
///////////////////////////////////////
// set second text fields value
///////////////////////////////////
// allocate our field chunk
htext = MemHandleNew(81);
if(htext == NULL)
return(0);
// lock the memory, get the pointer
ptext = MemHandleLock(htext);
// put some text in the field
StrCopy(ptext, "world");
// unlock the fields memory
MemHandleUnlock(htext);
// get an index to the second text field
index = FrmGetObjectIndex(pForm,kMainFormSecondValueTxtField);
// get the pointer to our field
field = FrmGetObjectPtr(pForm, index);
// set the text
FldSetTextHandle(field, htext);
FrmDrawForm(pForm);
handled = true;
break;
default:
break;
}
return handled;
}
static Boolean ResultsFormHandleEvent(EventType* pEvent)
{
Boolean handled = false;
FormType* pForm;
switch (pEvent->eType) {
case menuEvent:
//return MainFormDoCommand(pEvent->data.menu.itemID);
case ctlSelectEvent:
if (pEvent->data.ctlSelect.controlID ==
kResultsFormBackButton)
{
FrmGotoForm(kMainForm);
FrmHandleEvent(FrmGetActiveForm(), pEvent);
handled = true;
break;
}
case frmOpenEvent:
pForm = FrmGetActiveForm();
// Convert a float to a string
theCompFloat.d = theFloat1 * theFloat2;
FlpFToA( theCompFloat.fd, theString );
////////////////////////////////////
// set results text field value
//////////////////////////////////
// allocate our field chunk
htext = MemHandleNew(81);
if(htext == NULL)
return(0);
// lock the memory, get the pointer
ptext = MemHandleLock(htext);
// put some text in the field
StrCopy(ptext, theString);
//resize field
MemHandleResize(htext, StrLen(ptext)+1);
// unlock the fields memory
MemHandleUnlock(htext);
// get an index to the first text field
index = FrmGetObjectIndex(pForm,kResultsFormResultsTxtField);
// get the pointer to our field
field = FrmGetObjectPtr(pForm, index);
// set the text
FldSetTextHandle(field, htext);
// set focus on the intial text field
FrmSetFocus(pForm, index);
FrmDrawForm(pForm);
handled = true;
break;
default:
break;
}
return handled;
}
/***********************************************************************
*
* FUNCTION: AppHandleEvent
*
* DESCRIPTION: This routine loads form resources and set the event
* handler for the form loaded.
*
* PARAMETERS: event - a pointer to an EventType structure
*
* RETURNED: true if the event has handle and should not be passed
* to a higher level handler.
*
* REVISION HISTORY:
*
*
***********************************************************************/
static Boolean AppHandleEvent(EventType* pEvent)
{
UInt16 formId;
FormType* pForm;
Boolean handled = false;
if (pEvent->eType == frmLoadEvent) {
// Load the form resource.
formId = pEvent->data.frmLoad.formID;
pForm = FrmInitForm(formId);
FrmSetActiveForm(pForm);
// Set the event handler for the form. The handler of the
currently
// active form is called by FrmHandleEvent each time is
receives an
// event.
switch (formId) {
case kMainForm:
FrmSetEventHandler(pForm, MainFormHandleEvent);
break;
case kResultsForm:
FrmSetEventHandler(pForm,
ResultsFormHandleEvent);
break;
default:
break;
}
handled = true;
}
return handled;
}
/***********************************************************************
*
* FUNCTION: AppStart
*
* DESCRIPTION: Get the current application's preferences.
*
* PARAMETERS: nothing
*
* RETURNED: Err value errNone if nothing went wrong
*
* REVISION HISTORY:
*
*
***********************************************************************/
static Err AppStart(void)
{
FrmGotoForm(kMainForm);
return errNone;
}
/***********************************************************************
*
* FUNCTION: AppStop
*
* DESCRIPTION: Save the current state of the application.
*
* PARAMETERS: nothing
*
* RETURNED: nothing
*
* REVISION HISTORY:
*
*
***********************************************************************/
static void AppStop(void)
{
// Close all the open forms.
FrmCloseAllForms();
}
/***********************************************************************
*
* FUNCTION: AppEventLoop
*
* DESCRIPTION: This routine is the event loop for the application.
*
* PARAMETERS: nothing
*
* RETURNED: nothing
*
* REVISION HISTORY:
*
*
***********************************************************************/
static void AppEventLoop(void)
{
Err error;
EventType event;
do {
EvtGetEvent(&event, evtWaitForever);
if (SysHandleEvent(&event))
continue;
if (MenuHandleEvent(0, &event, &error))
continue;
if (AppHandleEvent(&event))
continue;
FrmDispatchEvent(&event);
} while (event.eType != appStopEvent);
}
/***********************************************************************
*
* FUNCTION: PilotMain
*
* DESCRIPTION: This is the main entry point for the application.
*
* PARAMETERS: cmd - word value specifying the launch code.
* cmdPB - pointer to a structure that is associated with the
launch code.
* launchFlags - word value providing extra information about the
launch.
* RETURNED: Result of launch
*
* REVISION HISTORY:
*
*
***********************************************************************/
UInt32 PilotMain(UInt16 cmd, MemPtr cmdPBP, UInt16 launchFlags)
{
Err error = errNone;
//Err error1;
switch (cmd) {
case sysAppLaunchCmdNormalLaunch:
if ((error = AppStart()) == 0) {
// make sure MathLib is on the PDA
/*error = SysLibFind(MathLibName, &MathLibRef);
if (error)
error = SysLibLoad(LibType, MathLibCreator, &MathLibRef);
ErrFatalDisplayIf(error, "Can't find MathLib"); // Just an
example; handle it gracefully
error = MathLibOpen(MathLibRef, MathLibVersion);
ErrFatalDisplayIf(error, "Can't open MathLib");
*/
AppEventLoop();
AppStop();
}
break;
default:
break;
}
return error;
}
