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EM_EXLINEFROMCHAR 参数的含义

[英]Meaning of the parameters for EM_EXLINEFROMCHAR

原文 2022-02-02 21:22:52 6 1 winapi/ visual-c++

The parameter for EM_EXLINEFROMCHAR and EM_LINEFROMCHAR are different. EM_EXLINEFROMCHAR和EM_LINEFROMCHAR的参数不同。

While I can find the example of the latter the former does not produce any useful links.虽然我可以找到后者的例子，但前者并没有产生任何有用的链接。

What I wonder is - if I pass -1 just like in EM_LINEFROMCHAR to EM_EXLINEFROMCHAR for the current line where the caret is located will it work properly.我想知道的是 - 如果我像在EM_LINEFROMCHAR中一样将-1传递给EM_EXLINEFROMCHAR以用于插入符号所在的当前行，它将正常工作。 MSDN unfortunately doesn't explain it.不幸的是，MSDN 没有解释它。

TIA!!蒂亚！！

1 个解决方案

Unfortunately, the documentation for EM_EXLINEFROMCHAR only says that the lParam is a "Zero-based index of the character", there is no mention of whether -1 is allowed or not.不幸的是， EM_EXLINEFROMCHAR的文档只说lParam是“字符的从零开始的索引”，没有提到是否允许-1 。 So best not to take any chances.所以最好不要冒险。 Getting the current caret position is trivial using EM_GETSEL or EM_EXGETSEL .使用EM_GETSEL或EM_EXGETSEL获取当前插入符号 position 是微不足道的。

Unlike the EM_LINEFROMCHAR documentation, which explicitly states that -1 is supported and what it represents.与EM_LINEFROMCHAR文档不同，该文档明确指出支持-1以及它代表什么。