I'm using SDK 4.0 and made use of the call LstGetTopItem so I can store the
top item of a list. The call works fine if I'm using an OS 4.0 or higher
device but fails on an OS 3.5 device. I attempted to create a function that
would detect the version and use the older method but it will not compile.
I recieve the error:
Error: illegal use of incomplete struct/union/class 'ListType'
I've seen that error reported before here in the forum and know its related
to me attempting to access the internals of a structure. I'll be happy not
to do it if someone can tell me how to generate a prc that will work on my
3.5 devices as well as my 4.0.
And if I'm just doing something really stupid, I'm happy to accept that too.
Here is my attempt at a function to get around the problem:
Int16 MyLstGetTopItem(const FormType *frmP, UInt16 objIndex)
{
Int16 ret;
Int32 requiredVersion;
UInt32 romVersion;
// we can only use LstGetTopItem if the os is 4.0 or better
requiredVersion = sysMakeROMVersion(4,0,0,sysROMStageRelease,0);
FtrGet(sysFtrCreator, sysFtrNumROMVersion, &romVersion);
if (romVersion < requiredVersion)
{ // we have to do it the hard way
// and access the internal structures
#undef DO_NOT_ALLOW_ACCESS_TO_INTERNALS_OF_STRUCTS
ListType *pLst;
pLst = (ListType *)FrmGetObjectPtr (frmP, objIndex);
ret = pLst->topItem;
#define DO_NOT_ALLOW_ACCESS_TO_INTERNALS_OF_STRUCTS
}
else
{
ret = LstGetTopItem ((ListType *)FrmGetObjectPtr(frmP, objIndex));
}
return ret;
}
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