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bitbyter
bitbyter

Reputation: 910

How to get extended file-attributes in Windows in Python/Go/C/Batch?

I have searched a lot and have got some findings on how to get extended FA, but they are in C# using the language's own built-in APIs. I am trying to find the author name for a file in Windows, but my requirement is in Go/Python/C/Batch (order of priority).

In python, the third party packages (exifread and hachoir_metadata) are not working (not giving any result for a sample doc/xlsx file. Maybe the package I am installing via pip-install is erroneous).

Is there any other way or any user-level MSDN API available?

Please let me know if any experience on this. Thanks.

Upvotes: 3

Views: 1502

Answers (1)

Castorix
Castorix

Reputation: 1545

In C, C++ or other language, you get file properties with IPropertyStore interface

For example, for a .jpg file (test on Windows 10, VS 2015) =>

I get for Author : System.Author(Auteurs) = Test Auteur

PIDLIST_ABSOLUTE pidl = ILCreateFromPath(L"E:\\icon_rose.jpg");
if (pidl != NULL)
{
    IPropertyStore *pps;
    HRESULT hr = SHGetPropertyStoreFromIDList(pidl, GPS_DEFAULT, IID_PPV_ARGS(&pps));
    if (SUCCEEDED(hr))
    {
        DWORD dwCount;
        hr = pps->GetCount(&dwCount);
        PROPERTYKEY propKey;
        for (DWORD i = 0; i < dwCount; ++i)
        {
            hr = pps->GetAt(i, &propKey);
            if (SUCCEEDED(hr))
            {
                PWSTR pszCanonicalName = NULL;
                hr = PSGetNameFromPropertyKey(propKey, &pszCanonicalName);                      
                PWSTR pszDescriptionName = NULL;
                IPropertyDescription *ppd;
                hr = PSGetPropertyDescription(propKey, IID_PPV_ARGS(&ppd));
                if (SUCCEEDED(hr))
                {
                    hr = ppd->GetDisplayName(&pszDescriptionName);
                    ppd->Release();
                }
                PROPVARIANT propvarValue = { 0 };
                HRESULT hr = pps->GetValue(propKey, &propvarValue);
                if (SUCCEEDED(hr))
                {
                    PWSTR pszDisplayValue = NULL;
                    hr = PSFormatForDisplayAlloc(propKey, propvarValue, PDFF_DEFAULT, &pszDisplayValue);
                    if (SUCCEEDED(hr))
                    {
                        WCHAR wsBuffer[255];
                        wsprintf(wsBuffer, L"%s(%s) = %s\n", pszCanonicalName, (pszDescriptionName==NULL?L"Unknown":pszDescriptionName), pszDisplayValue);
                        OutputDebugString(wsBuffer);
                        CoTaskMemFree(pszDisplayValue);
                    }
                    PropVariantClear(&propvarValue);
                }
                if (pszCanonicalName != NULL)
                    CoTaskMemFree(pszCanonicalName);
                if (pszDescriptionName != NULL)
                    CoTaskMemFree(pszDescriptionName);;                         
            }
        }                   
        pps->Release();
    }
    ILFree(pidl);
}

Upvotes: 3

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