[fpc-pascal] C header to Pascal , what is the type of ENUM?

Dennis dec12 at avidsoft.com.hk
Fri Feb 23 16:06:47 CET 2018


In C
ENUM_BEGIN( RetCode )
     /*      0 */  ENUM_DEFINE( TA_SUCCESS, Success ), /* No error */
     /*      1 */  ENUM_DEFINE( TA_LIB_NOT_INITIALIZE, LibNotInitialize 
), /* TA_Initialize was not sucessfully called */
     /*      2 */  ENUM_DEFINE( TA_BAD_PARAM, BadParam ), /* A parameter 
is out of range */
     /*      3 */  ENUM_DEFINE( TA_ALLOC_ERR, AllocErr ), /* Possibly 
out-of-memory */
     /*      4 */  ENUM_DEFINE( TA_GROUP_NOT_FOUND, GroupNotFound ),
     /*      5 */  ENUM_DEFINE( TA_FUNC_NOT_FOUND, FuncNotFound ),
     /*      6 */  ENUM_DEFINE( TA_INVALID_HANDLE, InvalidHandle ),
     /*      7 */  ENUM_DEFINE( TA_INVALID_PARAM_HOLDER, 
InvalidParamHolder ),
     /*      8 */  ENUM_DEFINE( TA_INVALID_PARAM_HOLDER_TYPE, 
InvalidParamHolderType ),
     /*      9 */  ENUM_DEFINE( TA_INVALID_PARAM_FUNCTION, 
InvalidParamFunction ),
     /*     10 */  ENUM_DEFINE( TA_INPUT_NOT_ALL_INITIALIZE, 
InputNotAllInitialize ),
     /*     11 */  ENUM_DEFINE( TA_OUTPUT_NOT_ALL_INITIALIZE, 
OutputNotAllInitialize ),
     /*     12 */  ENUM_DEFINE( TA_OUT_OF_RANGE_START_INDEX, 
OutOfRangeStartIndex ),
     /*     13 */  ENUM_DEFINE( TA_OUT_OF_RANGE_END_INDEX, 
OutOfRangeEndIndex ),
     /*     14 */  ENUM_DEFINE( TA_INVALID_LIST_TYPE, InvalidListType ),
     /*     15 */  ENUM_DEFINE( TA_BAD_OBJECT, BadObject ),
     /*     16 */  ENUM_DEFINE( TA_NOT_SUPPORTED, NotSupported ),
     /*   5000 */  ENUM_DEFINE( TA_INTERNAL_ERROR, InternalError ) = 5000,
     /* 0xFFFF */  ENUM_DEFINE( TA_UNKNOWN_ERR, UnknownErr ) = 0xFFFF
ENUM_END( RetCode )

The function in C is
TA_RetCode TA_EMA( int    startIdx,
                    int    endIdx,
                    const double inReal[],
                    int           optInTimePeriod, /* From 2 to 100000 */
                    int          *outBegIdx,
                    int          *outNBElement,
                    double        outReal[] );

my question is, what should the type of TA_RetCode be in Pascal? Word (2 
byte) or LongWord (4 bytes)?

In short, is this pascal translation correct?
function TA_EMA(startIdx, endIdx : integer;
                    const inReal : PDouble;
                    optInTimePeriod : integer;
                    var utBegIdx,
                    outNBElement : integer;
                    outReal : PDouble ) : Word;stdcall; external 
'ta_func.dll';

Note: the dll is 64-bit windows but I am not sure whether int should 
translate to Integer or Int64 in Pascal.

Dennis


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