private void WmGetObject(ref Message m) {
// See "How to Handle WM_GETOBJECT" in MSDN
//
if (NativeMethods.OBJID_CLIENT == unchecked((int)(long)m.LParam)) {
// Get the IAccessible GUID
//
Guid IID_IAccessible = new Guid(NativeMethods.uuid_IAccessible);
// Get an Lresult for the accessibility Object for this control
//
IntPtr punkAcc;
try {
AccessibleObject wfAccessibleObject = null;
UnsafeNativeMethods.IAccessibleInternal iacc = null;
if (_accessibilityObject == null) {
IntSecurity.UnmanagedCode.Assert();
try {
wfAccessibleObject = new ChildAccessibleObject(_owner, Handle);
_accessibilityObject = new InternalAccessibleObject(wfAccessibleObject);
}
finally {
CodeAccessPermission.RevertAssert();
}
}
iacc = (UnsafeNativeMethods.IAccessibleInternal)_accessibilityObject;
// Obtain the Lresult
//
punkAcc = Marshal.GetIUnknownForObject(iacc);
IntSecurity.UnmanagedCode.Assert();
try {
m.Result = UnsafeNativeMethods.LresultFromObject(ref IID_IAccessible, m.WParam, new HandleRef(this, punkAcc));
}
finally {
CodeAccessPermission.RevertAssert();
Marshal.Release(punkAcc);
}
}
catch (Exception e) {
throw new InvalidOperationException(SR.GetString(SR.RichControlLresult), e);
}
}
else { // m.lparam != OBJID_CLIENT, so do default message processing
DefWndProc(ref m);
}
}
public ToolStripComboBoxControlAccessibleObject(ToolStripComboBoxControl toolStripComboBoxControl)
: base(toolStripComboBoxControl)
{
_childAccessibleObject = new ChildAccessibleObject(toolStripComboBoxControl, toolStripComboBoxControl.InternalHandle);
}
