I am trying to learn both C and the Palm OS API and it is proving to be rather
difficult. I have a fairly good understanding of Palm Resources and have used RsrcEdit
quite a bit as well I have created several VB apps. What I was hoping to do was create
a basic C application that would modify a Palm resource within the .PRC. My main
difficulty is understanding how to load the variables and arrays into the data
structure and once the resource is loaded in how I read the separate parts of it into
variables.
//The structure of the resource is:
typedef struct formInfoRsrc
{
UInt32 dbType;
UInt32 dbCreator;
char dbName[32];
UInt16 useDatabase;
UInt32 key;
UInt16 numFields;
fieldDesc field[1]; // this is actually the first of several fields
} formInfoRsrc;
// since field[1] is actually the first of numFields fields I need to allocate memory
for the new resource by doing:
// p = MemPtrNew( sizeof(formInfoRsrc) - sizeof(fieldDesc) + (numFields *
sizeof(fieldDesc)));
// but I am not really sure how to do this as I don't know numFields until I read the
resource.
// The fieldDesc structure is defined as:
typedef struct fieldDesc
{
UInt32 fieldName;
UInt16 id;
UInt16 type;
char formula[100];
} fieldDesc;
// I also know how to pull in the resources into using:
MemHandle h
formInfoRsrc *p
h = DmGetResource('data', 1000)
p = MemHandleLock(h)
---------------
My problems are:
1. p will have the correct structure and will have all the data loaded except the
data will only be for field[1]. I can set field[1] to field[8] or another variable in
the declaration but I would like to be able to set it dynamically in the code. How do
I get it p to see more than just field[1].
2. how do I load the fieldName in p into another 4 character variable? And how do I
select different ones associated with each field[x]?
Thanks
Greg
1
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