Hi,
I'm new in palm programming. When I tried to run my program use POSE
I got this error:
medIn(1.0)just read from memory location 0X80000020
This access usually indicates that the Application is calling a Window
Manager function without first establishing a valid DrawWindow.
what my program does: create a database, populate with data and display the
data to a form.
Any help will be greatly appreciated.
-paul
The following are my codes:
-----------------------------------------------------------------
static void InitializePassword(void)
{
User u1 = {1,"Joe","palm1"};
User *users[1];
UInt16 numUser = sizeof(users)/sizeof(users[0]);
UInt16 i;
users[0] = &u1;
for(i=0;i<numUser;i++){
UInt16 index = dmMaxRecordIndex;
MemHandle h = DmNewRecord(loginDB,&index,DBSize);
if(h){
PackUser(users[i],h);
DmReleaseRecord(loginDB,index,true);
}
}
}
/* The main entry point */
UInt32 PilotMain( UInt16 cmd, MemPtr cmdPBP, UInt16 launchFlags)
{
Err error;
Err err = 0;
UInt16 pass= 123;
error = RomVersionCompatible (ourMinVersion, launchFlags);
if (error) return (error);
if(((error = DmCreateDatabase(0,"logDB",'LOGB','lodb',false))!
=dmErrAlreadyExists)&&(error!=0))
{
FrmAlert(DBCreationErrorAlert);
return(0);
}
loginDB = DmOpenDatabaseByTypeCreator
('lodb','LOGB',dmModeReadWrite);
numRecords = DmNumRecords(loginDB);
if( numRecords == 0 )
{
InitializePassword();
}
showDB(numRecords);
switch (cmd)
{
case sysAppLaunchCmdNormalLaunch:
case sysAppLaunchCmdURLParams:
GoToURL("file:mainA.pqa");
default:
break;
}
DmCloseDatabase(loginDB);
return( 0 );
}
static void showDB(UInt16 numRecords)
{
FormPtr form;
User usr;
EventType event;
UInt16 attributes;
FieldPtr nameField;
FieldPtr passwordField;
UInt16 offset = OffsetOf(PackedUser, name);
MemHandle userHandle = DmGetRecord(loginDB, numRecords);
DmRecordInfo(loginDB, numRecords, &attributes, NULL, NULL);
genflag1 = 0;
form = FrmInitForm(DisplayForm);
FrmSetEventHandler(form, displayEvent);
FrmSetActiveForm(form);
UnpackUser(&usr, MemHandleLock(userHandle));
nameField = GetObjectFromActiveForm(DisplayNameField);
passwordField = GetObjectFromActiveForm(DisplayPasswordField);
SetFieldTextFromStr(DisplayNameField,(Char*)usr.name);
SetFieldTextFromStr(DisplayPasswordField,(Char*)usr.password);
FrmDrawForm(form);
do
{
EvtGetEvent(&event, -1);
if ( SysHandleEvent(&event) )
continue;
FrmDispatchEvent( &event );
}while( event.eType != appStopEvent && genflag1 == 0 );
MemHandleUnlock(userHandle);
DmReleaseResource(userHandle);
return;
}
static Boolean displayEvent( EventType* event)
{
if (event->eType == ctlSelectEvent )
genflag1 = 1;
return (false); // done
}
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