各种帮助 [英] VARIANT help

问题描述

我对自己拥有的SDK中的方法有些困惑.方法如下:

I''m a little confused about a method in a SDK that I have. Here''s the method:

HRESULT IDgnDictCustom::SnapShotSave( 
Variant IndexedFileName = vtMissing, Variant WaveFileName = vtMissing );

我不习惯使用变体，但是老实说，令我困惑的是如何正确使用此功能.这是期望将变体作为输入，但是我不认为您会以这种方式使用变体.

(我假设文件名只是我想​​要保存文件的路径)

I''m not used to using variants, but what is confusing me, honestly, is the how to use this function correctly. This is expecting the variants as an input, but I didn''t think you would use variants this way.

(I''m assuming the filenames are just the path where I want the file saved)

推荐答案

我已经在标题中找到了它

I have found this in the header

virtual /* [helpstring][id] */ HRESULT STDMETHODCALLTYPE SnapshotSave(
    /* [optional][in] */ VARIANT IndexedFileName,
    /* [optional][in] */ VARIANT WaveFileName) = 0;

(稍微清理一下)

SnapshotSave(/* in */VARIANT IndexedFileName，/* in */VARIANT WaveFileName)

现在，命名文件名在尝试时仍然会导致错误(只是将其命名为"c:\ test.ibx").在这种情况下，命名变量的正确方法是什么?

(cleaning it up a bit)

SnapshotSave(/*in*/ VARIANT IndexedFileName, /*in*/ VARIANT WaveFileName)

now, naming the file names still causes an error when I try it (just name it like "c:\test.ibx") What''s the proper way to name the variant in this case?

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