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    struct TCITEM

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Declare Function TCITEM Lib "user32.dll" (TODO) As TODO

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    TCITEM tcitem = new TCITEM();

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    tcitem.size = 200;

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    IntPtr tcitemPtr = VirtualAllocEx(process, IntPtr.Zero, (uint)Marshal.SizeOf(typeof(TCITEM)), AllocationType.Commit, MemoryProtection.ReadWrite);

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    tcitem.mask = TCIF_STATE | TCIF_TEXT;

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    tcitem.text = pszTextPtr;

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    IntPtr ptr = Marshal.AllocHGlobal(Marshal.SizeOf(tcitem));

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    Marshal.StructureToPtr(tcitem, ptr, true);

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    tcitem.size = 1; // überschrieben

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    WriteProcessMemory(process, tcitemPtr, ptr, Marshal.SizeOf(tcitem), IntPtr.Zero);

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    int res = SendMessage(handle, TCM_GETITEMA, index, tcitemPtr);

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    ptr = Marshal.AllocHGlobal(Marshal.SizeOf(tcitem));

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    ReadProcessMemory(process, tcitemPtr, ptr, (int)Marshal.SizeOf(tcitem), out bytesReaded);

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    tcitem = (TCITEM)Marshal.PtrToStructure(ptr, tcitem.GetType());

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    VirtualFreeEx(process, tcitemPtr, 0, FreeType.Release);

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Documentation

[TCITEM] on MSDN