fix exception for StylableListView (#64)

Assorted-Development · Feb 27, 2024 · 89ecc4f · 89ecc4f
1 parent 9e6a598
commit 89ecc4f
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diff --git a/StylableWinFormsControls/StylableWinFormsControls.Example/FrmDefault.Designer.cs b/StylableWinFormsControls/StylableWinFormsControls.Example/FrmDefault.Designer.cs
diff --git a/StylableWinFormsControls/StylableWinFormsControls/Controls/StylableListView.cs b/StylableWinFormsControls/StylableWinFormsControls/Controls/StylableListView.cs
@@ -227,6 +227,11 @@ private IntPtr drawItem(IntPtr mHWnd, int itemIndex, NativeMethods.NMLVCUSTOMDRA
 
     private IntPtr drawGroupHeader(IntPtr mHWnd, NativeMethods.NMLVCUSTOMDRAW pnmlv)
     {
+        //fix "failed to do native call 'SendMessage' (msg = LVM_GETGROUPINFO, wParam = 16)"
+        if (pnmlv.nmcd.dwItemSpec == IntPtr.Zero)
+        {
+            return new IntPtr((int)NativeMethods.CDRF.SkipDefault);
+        }
         NativeMethods.RECT rectHeader = new()
         {
             top = NativeConstants.LVGGR_HEADER