如何在XLOPER和VARIANT之间进行编组? [英] How can I marshall between XLOPER and VARIANT?

问题描述

我正在研究与COM对象进行通信的Excel插件(XLL).因此，我必须在XLOPER和VARIANT之间进行编组.我已经完成了大部分工作，但是数组绝对是一件痛苦的事.我需要支持一维和二维数组.

I'm working on an Excel plugin (XLL), which communicates with COM objects. So, I have to marshall between XLOPER and VARIANT. I've got most of this working, but arrays are definitely a pain. I need to support 1- and 2D arrays.

我想以前有人已经处理过这个问题.简化处理VARIANT，SAFEARRAY和XLOPER(和XLOPER12)的最佳方法是什么?

I imagine someone has already had to deal with this before. What's the best way to simplify dealing with VARIANT, SAFEARRAY, and XLOPER (and XLOPER12)?

推荐答案

为此，我不得不手动编写自己的编组代码.没有可免费使用的库来处理此问题. XLW用于包装您的整个插件-这对我来说不是一个选择.

I had to hand-roll my own marshalling code for this. There were no freely available libs to handle this. XLW is meant for wrapping your entire plugin - this was not an option for me.

最后，只花了很多时间，浏览了xloper和variant的文档，并弄清楚了如何将它们相互映射.

In the end, it just took a lot of time, looking through the documentation for xloper and variant, and figuring out how to map them to each other.

出于好奇:

xloper(12)中的数组:

arrays in xloper(12):

• .xltype是xltypeMulti
• .val.array是指向xlopers数组的指针.

数组的变体:

• .vt是VT_ARRAY | VT_VARIANT
• .parray是SafeArray的变体形式

此编组的其他技巧:

• xltypeRef和xltypeSRef:使用xlCoerce查找实际的单元格值.
• 整数值存在溢出风险. boost::numeric_cast为此提供了帮助.
• 字符串编组很烦人. xloper使用char，xloper12使用wchar，变体使用bstr.
• 记住要释放为新的xloper字符串分配的缓冲区.相应地使用xlbitDLLFree和xlAutoFree(12).
• 模板编程对于xloper/xloper12问题很有用.助推器有帮助. _bstr_t也有帮助.

• xltypeRef and xltypeSRef: use xlCoerce to look up actual cell values.
• integer values run the risk of overflow. boost::numeric_cast helps with that.
• string marshalling is annoying. xloper uses char, xloper12 uses wchar, variant uses bstr.
• Remember to free the buffers you allocate for your new xloper strings. Use xlbitDLLFree and xlAutoFree(12) accordingly.
• Template programming is useful for the xloper/xloper12 issue. Boost helps. _bstr_t also helps.

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