挂接到文件中，实时读取新内容 [英] hook into a file, read new content in real time

问题描述

我该如何挂接到另一个程序中并不断写入该文件的当前文件中？假设有一个10行的文本文件。启动我的应用程序时，每次编写程序保存其内容时，它都必须检测并从中读取任何内容。可以在不不断检查文件大小/日期的情况下完成此操作吗？

How would I hook into a file that's currently in use by another program, which constantly writes out to it? Let's say, there's a text file with 10 lines. When I start my app it has to detect and read any content from there on everytime the writing program saves its content. Can this be done without a constant check on the filesize/date?

推荐答案

您可以使用ReadDirectoryChangesW API监视文件夹中的更改。

You could monitor the folder for changes using the ReadDirectoryChangesW API.

跟踪您最近读到的位置，并且当您收到该文件的更改通知时，请从该位置读取到文件末尾（与当前位置相同）

Keep track of the last position you read to, and when you receive a change notification for that file, read from there to the end of the file (as it currently stands).

如何使用ReadDirectoryChangesW API的示例在此处：

An example of how to use the ReadDirectoryChangesW API is here:

为什么ReadDirectoryChangesW忽略事件？

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