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- all SendMessage() calls
- BM_GETCHECK (sysData.isChecked())
-- WM_GETTEXTLENGTH (LRESULT is unsinged so) (sysData.text())
+- WM_GETTEXTLENGTH (LRESULT is signed but we treat it as unsigned and MSDN says nothing about error returns) (sysData.text())
- WM_GETTEXT (WM_GETTEXTLENGTH docs say its result may be larger than the actual length, so we can't use that) (sysData.text())
- CB_GETCURSEL/LB_GETCURSEL (sysData.selectedIndex())
- LB_GETSELCOUNT/LB_GETSELITEMS (LB_ERR is returned if this is a single-selection listbox; are there actual errors?) (sysData.selectedIndices())