检查给定路径是否为特殊文件夹路径? [英] Check if a given path is a special folder path?

问题描述

在Windows上，可以使用SHGetKnownFolderPath或SHGetSpecialFolder获取任何特殊的文件夹路径(如果我没记错的话，可以找到最后一个).但是，我想反过来，我有一个路径，想知道它属于哪个特殊文件夹(如果有).我更喜欢这种方法，因为要查明给定路径是否在特定的特殊文件夹中，我必须为所有用户枚举所有特殊的文件夹，这有点丑陋，但是如果没有其他方法，那么天空是极限:)

On Windows, one can get any special folder path using SHGetKnownFolderPath or SHGetSpecialFolder (If I remember correctly this last one). However, I want the reverse, I have a path and want to know which special folder it belongs to, if any. I prefer this approach, because to find out if a given path's is in a particular special folder or not, I'll have to enumerate all special folders for all users which is a bit of ugly, but if there's no other way, the sky is the limit :)

我搜索了它，但找不到有用的东西.那么WinApi是否具有执行此功能的功能?

I searched it but couldn't find anything useful. So does WinApi has a function to do just that?

谢谢.

推荐答案

您可以使用

You can use IKnownFolderManager::FindFolderFromPath

自Vista开始提供.

Available since Vista.

PS:检出 CComPtr<> 类简化与COM的连接.

这是我刚刚制作的一个示例，展示了如何使用它:

Here is a sample i just made up, showing how to use it:

#include <atlsafe.h>
#include <Shobjidl.h>
#include <comdef.h>

void PrintKnownFolder( const CComPtr<IKnownFolder>& folder )
{
    KNOWNFOLDER_DEFINITION def;
    HRESULT hr = folder->GetFolderDefinition( &def );
    if( SUCCEEDED(hr) ) {
        std::wcout << L"Result: " << def.pszName << std::endl;
        FreeKnownFolderDefinitionFields( &def );
    } else {
        _com_error err(hr);
        std::wcout << L"Error while querying GetFolderDefinition: " << err.ErrorMessage() << std::endl;
    }
}


class CCoInitialize
{
public:
    CCoInitialize() : m_hr(CoInitialize(NULL)) { }
    ~CCoInitialize() { if (SUCCEEDED(m_hr)) CoUninitialize(); }
    operator HRESULT() const { return m_hr; }
private:
    HRESULT m_hr;
};


bool test()
{
    CCoInitialize co;
    CComPtr<IKnownFolderManager> knownFolderManager;
    HRESULT hr = knownFolderManager.CoCreateInstance( CLSID_KnownFolderManager );
    if( !SUCCEEDED(hr) ) {
        _com_error err(hr);
        std::wcout << L"Error while creating KnownFolderManager: " << err.ErrorMessage() << std::endl;
        return false;
    }

    CComPtr<IKnownFolder> folder;
    hr = knownFolderManager->FindFolderFromPath( L"C:\\Users\\All Users\\Microsoft", FFFP_NEARESTPARENTMATCH, &folder );
    if( SUCCEEDED(hr) ) {
        PrintKnownFolder(folder);
    } else {
        _com_error err(hr);
        std::wcout << L"Error while querying KnownFolderManager for nearest match: " << err.ErrorMessage() << std::endl;
    }

    // dispose it.
    folder.Attach( NULL );

    hr = knownFolderManager->FindFolderFromPath( L"C:\\Users\\All Users\\Microsoft", FFFP_EXACTMATCH, &folder );
    if( SUCCEEDED(hr) ) {
        PrintKnownFolder(folder);
    } else {
        _com_error err(hr);
        std::wcout << L"Error while querying KnownFolderManager for exact match: " << err.ErrorMessage() << std::endl;
    }

    return true;
}

从The Old New Thing借来的CCoInitialize

CCoInitialize borrowed from The Old New Thing

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