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    <p>We have these definitions from CommCtrl.h:</p> <pre><code>#define TreeView_SetItemState(hwndTV, hti, data, _mask) \ { TVITEM _ms_TVi;\ _ms_TVi.mask = TVIF_STATE; \ _ms_TVi.hItem = (hti); \ _ms_TVi.stateMask = (_mask);\ _ms_TVi.state = (data);\ SNDMSG((hwndTV), TVM_SETITEM, 0, (LPARAM)(TV_ITEM *)&amp;_ms_TVi);\ } #define TreeView_SetCheckState(hwndTV, hti, fCheck) \ TreeView_SetItemState(hwndTV, hti, INDEXTOSTATEIMAGEMASK((fCheck)?2:1), TVIS_STATEIMAGEMASK) </code></pre> <p>We can translate this to C# using PInvoke. First, we implement these macros as functions, and then add whatever other support is needed to make those functions work. Here is my first shot at it. You should double check my code especially when it comes to the marshalling of the struct. Further, you may want to Post the message cross-thread instead of calling SendMessage.</p> <p>Lastly, I am not sure if this will work at all since I believe that the common controls use WM_USER+ messages. When these messages are sent cross-process, the data parameter's addresses are unmodified and the resulting process may cause an Access Violation. This would be a problem in whatever language you use (C++ or C#), so perhaps I am wrong here (you say you have a working C++ program).</p> <pre><code>static class Interop { public static IntPtr TreeView_SetCheckState(HandleRef hwndTV, IntPtr hti, bool fCheck) { return TreeView_SetItemState(hwndTV, hti, INDEXTOSTATEIMAGEMASK((fCheck) ? 2 : 1), (uint)TVIS.TVIS_STATEIMAGEMASK); } public static IntPtr TreeView_SetItemState(HandleRef hwndTV, IntPtr hti, uint data, uint _mask) { TVITEM _ms_TVi = new TVITEM(); _ms_TVi.mask = (uint)TVIF.TVIF_STATE; _ms_TVi.hItem = (hti); _ms_TVi.stateMask = (_mask); _ms_TVi.state = (data); IntPtr p = Marshal.AllocCoTaskMem(Marshal.SizeOf(_ms_TVi)); Marshal.StructureToPtr(_ms_TVi, p, false); IntPtr r = SendMessage(hwndTV, (int)TVM.TVM_SETITEMW, IntPtr.Zero, p); Marshal.FreeCoTaskMem(p); return r; } private static uint INDEXTOSTATEIMAGEMASK(int i) { return ((uint)(i) &lt;&lt; 12); } [DllImport("user32.dll", CharSet = CharSet.Auto)] private static extern IntPtr SendMessage(HandleRef hWnd, int msg, IntPtr wParam, IntPtr lParam); private enum TVIF : uint { TVIF_STATE = 0x0008 } private enum TVIS : uint { TVIS_STATEIMAGEMASK = 0xF000 } private enum TVM : int { TV_FIRST = 0x1100, TVM_SETITEMA = (TV_FIRST + 13), TVM_SETITEMW = (TV_FIRST + 63) } private struct TVITEM { public uint mask; public IntPtr hItem; public uint state; public uint stateMask; public IntPtr pszText; public int cchTextMax; public int iImage; public int iSelectedImage; public int cChildren; public IntPtr lParam; } } </code></pre>
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    1. USFrank Krueger
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    1. COYep, this worked.
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