private void ProcessForm_Load(object sender, EventArgs e)
{
// Note: While setting the AccessibleDescription of the control leads to the MSAA data
// for for the control being updated, that change does not get propagated through the
// UIA API to clients such as Narrator. So do not use AccessibleDescription. In fact,
// MSDN states: "Pitfall: Do Not Use AccDescription".
// https://msdn.microsoft.com/en-us/windows/desktop/gg712256.aspx
// Note: The Accessibility namespace suggest that IAccPropServices can be used
// in a WinForms app in a similar way to how it can be used in a Win32 app.
// GuyBark: I can't get this to work. Maybe my GetRemotableHandle() is no good?
var services = new Accessibility.CAccPropServices();
Accessibility._RemotableHandle rApp = GetRemotableHandle(buttonProcess.Handle);
Guid HelpText_Property_GUID = new Guid(
0x08555685, 0x0977, 0x45c7, 0xa7, 0xa6, 0xab, 0xaf, 0x56, 0x84, 0x12, 0x1a);
// This doesn't work.
services.SetHwndPropStr(
ref rApp,
0xFFFFFFFC, // OBJID_CLIENT
0, // CHILDID_SELF
HelpText_Property_GUID,
"Some localized helpful test");
}
[System.Runtime.CompilerServices.MethodImpl(System.Runtime.CompilerServices.MethodImplOptions.InternalCall)] public virtual void SetHwndPropServer([System.Runtime.InteropServices.ComAliasNameAttribute("Accessibility.wireHWND")][System.Runtime.InteropServices.In] ref Accessibility._RemotableHandle hwnd, [System.Runtime.InteropServices.In] uint idObject, [System.Runtime.InteropServices.In] uint idChild, [System.Runtime.InteropServices.In] ref System.Guid paProps, [System.Runtime.InteropServices.In] int cProps, [System.Runtime.InteropServices.In][System.Runtime.InteropServices.MarshalAs(System.Runtime.InteropServices.UnmanagedType.Interface)] Accessibility.IAccPropServer pServer, [System.Runtime.InteropServices.In] Accessibility.AnnoScope AnnoScope)
{
}
[System.Runtime.CompilerServices.MethodImpl(System.Runtime.CompilerServices.MethodImplOptions.InternalCall)] public virtual void SetHmenuPropStr([System.Runtime.InteropServices.ComAliasNameAttribute("Accessibility.wireHMENU")][System.Runtime.InteropServices.In] ref Accessibility._RemotableHandle hmenu, [System.Runtime.InteropServices.In] uint idChild, [System.Runtime.InteropServices.In] System.Guid idProp, [System.Runtime.InteropServices.In][System.Runtime.InteropServices.MarshalAs(System.Runtime.InteropServices.UnmanagedType.LPWStr)] string str)
{
}
[System.Runtime.CompilerServices.MethodImpl(System.Runtime.CompilerServices.MethodImplOptions.InternalCall)] public virtual void SetHwndProp([System.Runtime.InteropServices.ComAliasNameAttribute("Accessibility.wireHWND")][System.Runtime.InteropServices.In] ref Accessibility._RemotableHandle hwnd, [System.Runtime.InteropServices.In] uint idObject, [System.Runtime.InteropServices.In] uint idChild, [System.Runtime.InteropServices.In] System.Guid idProp, [System.Runtime.InteropServices.In][System.Runtime.InteropServices.MarshalAs(System.Runtime.InteropServices.UnmanagedType.Struct)] object var)
{
}
[System.Runtime.CompilerServices.MethodImpl(System.Runtime.CompilerServices.MethodImplOptions.InternalCall)] public virtual void ClearHwndProps([System.Runtime.InteropServices.ComAliasNameAttribute("Accessibility.wireHWND")][System.Runtime.InteropServices.In] ref Accessibility._RemotableHandle hwnd, [System.Runtime.InteropServices.In] uint idObject, [System.Runtime.InteropServices.In] uint idChild, [System.Runtime.InteropServices.In] ref System.Guid paProps, [System.Runtime.InteropServices.In] int cProps)
{
}
[System.Runtime.CompilerServices.MethodImpl(System.Runtime.CompilerServices.MethodImplOptions.InternalCall)] public virtual void ComposeHwndIdentityString([System.Runtime.InteropServices.ComAliasNameAttribute("Accessibility.wireHWND")][System.Runtime.InteropServices.In] ref Accessibility._RemotableHandle hwnd, [System.Runtime.InteropServices.In] uint idObject, [System.Runtime.InteropServices.In] uint idChild, [System.Runtime.InteropServices.Out] System.IntPtr ppIDString, out uint pdwIDStringLen)
{
ppIDString = default(System.IntPtr); pdwIDStringLen = default(uint);
}
public virtual void SetHwndPropStr([System.Runtime.InteropServices.In] ref Accessibility._RemotableHandle hwnd, [System.Runtime.InteropServices.In] uint idObject, [System.Runtime.InteropServices.In] uint idChild, [System.Runtime.InteropServices.In] System.Guid idProp, [System.Runtime.InteropServices.In][System.Runtime.InteropServices.MarshalAs(System.Runtime.InteropServices.UnmanagedType.LPWStr)] string str)
{
}
public virtual void SetHwndPropServer([System.Runtime.InteropServices.In] ref Accessibility._RemotableHandle hwnd, [System.Runtime.InteropServices.In] uint idObject, [System.Runtime.InteropServices.In] uint idChild, [System.Runtime.InteropServices.In] ref System.Guid paProps, [System.Runtime.InteropServices.In] int cProps, [System.Runtime.InteropServices.In][System.Runtime.InteropServices.MarshalAs(System.Runtime.InteropServices.UnmanagedType.Interface)] Accessibility.IAccPropServer pServer, [System.Runtime.InteropServices.In] Accessibility.AnnoScope AnnoScope)
{
}
public virtual void SetHmenuProp([System.Runtime.InteropServices.In] ref Accessibility._RemotableHandle hmenu, [System.Runtime.InteropServices.In] uint idChild, [System.Runtime.InteropServices.In] System.Guid idProp, [System.Runtime.InteropServices.In][System.Runtime.InteropServices.MarshalAs(System.Runtime.InteropServices.UnmanagedType.Struct)] object var)
{
}
public virtual void ComposeHwndIdentityString([System.Runtime.InteropServices.In] ref Accessibility._RemotableHandle hwnd, [System.Runtime.InteropServices.In] uint idObject, [System.Runtime.InteropServices.In] uint idChild, [System.Runtime.InteropServices.Out] System.IntPtr ppIDString, out uint pdwIDStringLen)
{
ppIDString = default(System.IntPtr); pdwIDStringLen = default(uint);
}
public virtual void ClearHwndProps([System.Runtime.InteropServices.In] ref Accessibility._RemotableHandle hwnd, [System.Runtime.InteropServices.In] uint idObject, [System.Runtime.InteropServices.In] uint idChild, [System.Runtime.InteropServices.In] ref System.Guid paProps, [System.Runtime.InteropServices.In] int cProps)
{
}