delphi - In Delphi how does the OnIncludeItem event work on TOpenDialog?

Question

I've been playing around with the TOpenDialog in Delphi XE2, and haven't been able to work out how to make the OnIncludeItem event work. I want to be able to show files based on their file name (or file size etc). Has anyone used this event successfully?

Answer 1

TOpenDialog是Windows Common Dialog组件的封装。OnIncludeItem事件是对CDN_INCLUDEITEM通知机制 的封装。此通知的文档解释说，无论您从CDN_INCLUDEITEM通知消息（或 Delphi 中的事件）返回什么，始终包含设置了SFGAO_FILESYSTEM和SFGAO_FILESYSANCESTOR标志的项目。

此外，这些SFGAO属性的文档进一步向我表明，CDN_INCLUDEITEM机制从未打算用于过滤文件系统项，而是用于排除不属于文件系统的内容。

这在另一个稍微不同的问题的答案中得到证实。