>>>>>>>>Off the top of my head I don't know what the structure of a variant array looks like, but someone else probably does.
>>>>>>>
>>>>>>>hmm. Who?
>>>>>>>
>>>>>>
>>>>>>Someone who doesn't believe that VB is the root of all evil...
>>>>>
>>>>>Not me then...
>>>>>
>>>>>I can get the C declarations (will take some digging) will that help you to help me?
>>>>
>>>>Yep - I have a bit (read: lots) better knowledge of what C interfaces look like.
>>>
>>>double THILINKAGE THIbyld(const double *coupon,
>>>int num coupon,
>>>const THIDATE *maturity,
>>>int num maturity,
>>>THIDATE settle,
>>>double price, etc (lists a lot of optional parameters)
>>>
>>>Not sure if this is it or not, to be honest. This was in a pdf file deep in the "C" directory of the library I am evaluating. Does this tell you anything?
>>
>>Yep - the base structure passed contains pointers to an array of doubles - floating point numbers. You can pass a simple pointer to a double in VFP pretty easily; I'll have to look around to see what I can kludge up to pass an array of them.
>
>A function like this added to CLSHEAP would be very helpful.
>

Still looking for a way to create a DOUBLE conveniently.

The breakdown on what you see here might be instructuve.

Where your VB code has a variant array, the C code has a pointer to a buffer of the necessary data type, followed by the number of occurances of the indicated structure. IOW, what the strucuture will ultimately contain will look like:

{4 byte DWORD pointer to a buffer of DOUBLEs}
{4 byte INT number of DOUBLES in buffer}
{4 byte DWORD pointer to a buffer of THIDATEs}
{4 byte INT number of THIDATEs in buffer}
{THIDATE settle}
{DOUBLE price}
etc...

Converting VFP numbers to DOUBLE representation is the stumbling block here; CLSHEAP can easily handle the array by allocating a buffer and using NumToDWORD(nPtrReturnedFromAlloc)+NumToDWORD(nNumElementsInArray) to create the necessary array reference. On return, if a buffer is allocated and handed back, you could extract the array position and the number of elements in the array from the buffer returned by CopyFrom or GetMem() as:

#DEFINE ArrayPos 1 && 1 referenced offset of array in buffer
#DEFINE SizeOfDouble 8 && number of bytes in each array member

nNumFirstDataType = DWORDToNum(SUBST(cMyReturnedBuffer,ArrayPos + 4))
nFirstArrayLoc = DWORDToNum(SUBST(cMyReturnedBuffer,ArrayPos))
cFirstArray = GETMEM(nFirstArrayLoc, nNumFirstDataType * SizeOfDouble)

cFirstArray now gets parsed into indiviudal members.