>Alejandro,
>When passing arrays to API make your array a string. ie: a 6 doubles array :
>
>lcDoubleArray = replicate(chr(0),8*6)
>
>myDLL(..., @lcDoubleArray..)

Your approach is correct, but he'll need the UDFs contained in ClsHeap to then convert each 8 byte segment of the string from a string to a double, specifically DoubleToNum(). You can download ClsHeap from the Files Section; the source code for DoubleToNum() is:

FUNCTION DoubleToNum
LPARAMETER cDoubleInString
DECLARE RtlMoveMemory IN WIN32API AS RtlCopyDbl ;
	DOUBLE @DestNumeric, ;
	STRING @pVoidSource, ;
	INTEGER nLength
LOCAL nNum
* Note - the limit of decimal precision is established by the decimal precision
* of the pre-initialized numeric variable receiving the value
nNum = 0.0000000000000000000000000
=RtlCopyDbl(@nNum, cDoubleInString, 8)
RETURN nNum

I'm not certain if I've posted the latest version of ClsHeap with revised coinversion UDFs or not.