在 Windows 上查找文件的 MIME 类型
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Finding a MIME type for a file on windows
提问by rmeador
Is there a way to get a file's MIME type using some system call on Windows? I'm writing an IIS extension in C++, so it must be callable from C++, and I do have access to IIS if there is some functionality exposed. Obviously, IIS itself must be able to do this, but my googling has been unable to find out how. I did find this.net related question here on SO, but that doesn't give me much hope (as neither a good solution nor a C++ solution is mentioned there).
有没有办法在 Windows 上使用一些系统调用来获取文件的 MIME 类型？我正在用 C++ 编写一个 IIS 扩展，所以它必须可以从 C++ 调用，如果有一些功能公开，我确实可以访问 IIS。显然，IIS 本身必须能够做到这一点，但我的谷歌搜索一直无法找到方法。我确实在 SO 上找到了这个与 .net 相关的问题，但这并没有给我太多希望（因为那里既没有提到好的解决方案也没有提到 C++ 解决方案）。
I need it so I can serve up dynamic files using the appropriate content type from my app. My plan is to first consult a list of MIME types within my app, then fall back to the system's MIME type listing (however that works; obviously it exists since it's how you associate files with programs). I only have a file extension to work with in some cases, but in other cases I may have an actual on-disk file to examine. Since these will not be user-uploaded files, I believe I can trust the extension and I'd prefer an extension-only lookup solution since it seems simpler and faster. Thanks!
我需要它，以便我可以使用我的应用程序中的适当内容类型提供动态文件。我的计划是首先查阅我的应用程序中的 MIME 类型列表，然后返回到系统的 MIME 类型列表（但是这可行；显然它存在，因为它是您将文件与程序关联的方式）。在某些情况下，我只有一个文件扩展名可以使用，但在其他情况下，我可能需要检查一个实际的磁盘文件。由于这些不是用户上传的文件，我相信我可以信任扩展名，我更喜欢仅扩展名的查找解决方案，因为它看起来更简单、更快。谢谢！
回答by Jerry Coffin
HKCR\\.<ext>\Content Type(where "ext" is the file extension) will normally hold the MIME type.
HKCR\\.<ext>\Content Type（其中“ext”是文件扩展名）通常保存 MIME 类型。
回答by Peter Tseng
Pasted from http://www.snoyman.com/blog/2012/03/ie-mimetype-png.html:
粘贴自http://www.snoyman.com/blog/2012/03/ie-mimetype-png.html：
#include <urlmon.h>
#include <stdio.h>
int main(int argc, char* argv[])
{
char buff[256];
LPWSTR out;
FILE *in = fopen("title.png", "rb");
fread(buff, 1, 256, in);
FindMimeFromData(NULL, NULL, buff, 256, NULL, FMFD_DEFAULT, &out, 0);
printf("%ls\n", out);
return 0;
}
回答by Roger Cook
In Windows 10, the different MIME types are stored in the registry at:
在 Windows 10 中，不同的 MIME 类型存储在注册表中：
HKEY_CLASSES_ROOT\MIME\Database\Content Type
with a key for each content type (e. g. text/plain) under that key.
在该键下为每种内容类型（例如text/plain）提供一个键。
