转换一个变量数组到一个动态数组 [英] Converting a Variant Array to a Dynamic Array
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问题描述
我想转换一个变量数组(双打,但它可以是任何东西我猜的)来动态数组。我通常使用的DynArrayFromVariant和DynArrayToVariant程序,但在这种情况下,我的变种数组是基于1。这两个函数似乎只在0基于阵列的工作。任何想法,我怎么可能做我需要做什么?
I'm trying to convert a variant array (of doubles, but it could be anything I guess) to a dynamic array. I usually use the DynArrayFromVariant and DynArrayToVariant procedures, but in this case my variant arrays are 1 based. These two functions only seem to work on 0 based arrays. Any idea how I could do what I need to do?
推荐答案
如果你知道你的数组元素的类型,你可以写更高效(虽然不太通用)code:
If you know the type of your array elements you can write more efficient (while less generic) code:
function DoubleDynArrayFromVarArray(const V: Variant): TDoubleDynArray;
var
P: Pointer;
Count: Integer;
begin
Result := nil;
if not VarIsArray(V) or (VarType(V) and varTypeMask <> varDouble) or
(VarArrayDimCount(V) <> 1) then
raise EVariantInvalidArgError.Create(SVarInvalid);
Count := VarArrayHighBound(V, 1) - VarArrayLowBound(V, 1) + 1;
if Count = 0 then
Exit;
P := VarArrayLock(V);
try
SetLength(Result, Count);
Move(P^, Result[0], Count * SizeOf(Double));
finally
VarArrayUnlock(V);
end;
end;
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