Function ExtractDroppedFilesList

Explorer++/Helper/DataExchangeHelper.cpp:92–139

}

std::vector<std::wstring> ExtractDroppedFilesList(IDataObject *dataObject)
{
	FORMATETC droppedFilesFormatEtc = GetDroppedFilesFormatEtc();
	wil::unique_stg_medium stgMedium;
	HRESULT hr = dataObject->GetData(&droppedFilesFormatEtc, &stgMedium);

	if (hr != S_OK)
	{
		return {};
	}

	wil::unique_hglobal_locked mem(stgMedium.hGlobal);

	if (!mem)
	{
		return {};
	}

	auto *dropFiles = static_cast<DROPFILES *>(mem.get());
	UINT numDroppedFiles =
		DragQueryFile(reinterpret_cast<HDROP>(dropFiles), 0xFFFFFFFF, nullptr, 0);
	std::vector<std::wstring> droppedFiles;

	for (UINT i = 0; i < numDroppedFiles; i++)
	{
		UINT numCharacters = DragQueryFile(reinterpret_cast<HDROP>(dropFiles), i, nullptr, 0);

		if (numCharacters == 0)
		{
			continue;
		}

		std::wstring fullFileName;
		fullFileName.resize(numCharacters + 1);

		UINT charactersCopied = DragQueryFile(reinterpret_cast<HDROP>(dropFiles), i,
			fullFileName.data(), static_cast<UINT>(fullFileName.capacity()));

		if (charactersCopied == 0)
		{
			continue;
		}

		droppedFiles.push_back(fullFileName);
	}

	return droppedFiles;
}