使用C ++获取Windows文件信息

Question

Is there any way to can check for some properties of a Windows file using C++? The wanted formation is such as last access date, MIME Type, ...

For some other information extraction I am using Boost Filesystem.

Thanks in advance

Answer 1

For the file modification date, you could use Windows' API directly ( GetFileTime() ) or use boost::filesystem::last_write_time() .

As for MIME type, there's no real API as far as I'm aware. You'll essentially have to read the registry key HKEY_CLASSES_ROOT\\.<yourextension> and look for a value Content Type . If there is one, it includes the MIME type that is set for the extension.

Answer 2

The aims of C++ and boost are to be cross-platform. The language, the standard library and the boost library try to abstract the idiosyncrasies of the various environments from you, so your stated goal is inherently contentious with writing standard C++.

However if you know that you'll be compiling and running specifically on Windows you can wrap your code inside

#ifdef _WIN32
/* code here */
#endif

and call BOOL WINAPI GetFileAttributesEx(...) directly.

GetFileAttributesEx is part of kernel32.dll, which is loaded into every process, so you should be able to compile and link against it if you've included <windows.h> in your translation unit.

Answer 3

To get last access time, you can always use stat() , which is available on any OS (and it does not need Boost either).

As for MIME type, I don't think there is simple way to get that without analyzing file content.