Windows:如何获取已打开文件的模式/访问权限? [英] Windows: How do I get the mode/access rights of an already opened file?
问题描述
我正在编写一个使用数据库库的程序.该库使我可以访问用于访问表的文件句柄.我找到了一个Windows API，该API允许我按句柄检索有关文件的信息，但尚未找到确定该文件的访问模式/权限的任何方法.在这一点上，我确定我可能会在不了解此信息的情况下生活，但作为我的顽固，我不准备放手.显然Windows知道此信息-因此问题是如何哄骗信息?
I am writing a program that is using a database library. The library provides me access to the file handle it uses to access my table. I've found a windows API that allows me to retrieve information about the file by handle but I've yet to find any means of determining access mode / permissions of that file. At this point I'm sure I could likely live without knowing this information but being the stubborn cuss that I am I'm not ready to let this one go. Obviously Windows knows this info - so the question is how can coax the info out of it?
我发现的API函数是:GetFileInformationByHandleEx，它使我靠近水坑，但不允许我喝水.
The API function that I've found is: GetFileInformationByHandleEx and it takes me close to the watering hole but doesn't let me drink the water.
文件模式信息有用的原因是我需要修改表头信息.如果文件已经处于适当的模式，那么我就不必关闭表，打开文件，修改文件，关闭文件，然后重新打开表.
The reason that the file mode information is useful is that I need to modify the table header information. If the file is already in a proper mode then I won't have to close the table open the file modify the file close the file then re-open the table.
是的，在被告知我可以实现我的目标的所有选择之前，我对这些都不感兴趣.我只对原始问题感兴趣-如何确定已打开文件的模式.我期待您的任何答复，并在此先感谢您.
And yes, before I'm told of all the options available to me to achieve my goal - I'm not interested in those. I'm only interesting in the original question - how do I determine the mode of an already opened file. I look forward to any responses and I thank you in advance.
谢谢， 罗伯特·米利根(Robert Milligan)
Thanks, Robert Milligan
推荐答案
我不知道是否有相应的Win32 API，但是如果您确实需要，可以调用NtQueryObject(ObjectBasicInformation).
I don't know if there is a corresponding Win32 API for this, but if you really need it you can call NtQueryObject(ObjectBasicInformation).
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