Function BuildHDropList

Explorer++/Helper/ShellHelper.cpp:506–564

}

HRESULT BuildHDropList(
	FORMATETC *pftc, STGMEDIUM *pstg, const std::list<std::wstring> &filenameList)
{
	SetFORMATETC(pftc, CF_HDROP, NULL, DVASPECT_CONTENT, -1, TYMED_HGLOBAL);

	UINT uSize = 0;

	uSize = sizeof(DROPFILES);

	for (const auto &filename : filenameList)
	{
		uSize += static_cast<UINT>((filename.length() + 1) * sizeof(TCHAR));
	}

	/* The last string is double-null terminated. */
	uSize += (1 * sizeof(TCHAR));

	HGLOBAL hglbHDrop = GlobalAlloc(GMEM_MOVEABLE, uSize);

	if (hglbHDrop == NULL)
	{
		return E_FAIL;
	}

	auto pcidaData = static_cast<LPVOID>(GlobalLock(hglbHDrop));

	auto *pdf = static_cast<DROPFILES *>(pcidaData);

	pdf->pFiles = sizeof(DROPFILES);
	pdf->fNC = FALSE;
	pdf->pt.x = 0;
	pdf->pt.y = 0;
	pdf->fWide = TRUE;

	LPBYTE pData;
	UINT uOffset = 0;

	TCHAR chNull = '\0';

	for (const auto &filename : filenameList)
	{
		pData = static_cast<LPBYTE>(pcidaData) + sizeof(DROPFILES) + uOffset;

		memcpy(pData, filename.c_str(), (filename.length() + 1) * sizeof(TCHAR));
		uOffset += static_cast<UINT>((filename.length() + 1) * sizeof(TCHAR));
	}

	/* Copy the last null byte. */
	pData = static_cast<LPBYTE>(pcidaData) + sizeof(DROPFILES) + uOffset;
	memcpy(pData, &chNull, (1 * sizeof(TCHAR)));

	GlobalUnlock(hglbHDrop);

	pstg->pUnkForRelease = 0;
	pstg->hGlobal = hglbHDrop;
	pstg->tymed = TYMED_HGLOBAL;

	return S_OK;