/// <summary>
/// Get DesktopElements based on Process Id.
/// </summary>
/// <param name="pid"></param>
/// <returns>return null if we fail to get elements by process Id</returns>
public static IEnumerable <DesktopElement> ElementsFromProcessId(int pid)
{
IUIAutomationElement root = null;
IEnumerable <DesktopElement> elements = null;
IUIAutomationCondition condition = null;
IUIAutomationElementArray elementArray = null;
try
{
// check whether process exists first.
// if not, it will throw an ArgumentException
using (var proc = Process.GetProcessById(pid))
{
root = UIAutomation.GetRootElement();
condition = UIAutomation.CreatePropertyCondition(PropertyType.UIA_ProcessIdPropertyId, pid);
elementArray = root.FindAll(TreeScope.TreeScope_Children, condition);
elements = ElementsFromUIAElements(elementArray);
}
}
#pragma warning disable CA1031 // Do not catch general exception types
catch (Exception ex)
{
// report and let it return null
ex.ReportException();
}
#pragma warning restore CA1031 // Do not catch general exception types
finally
{
if (root != null)
{
Marshal.ReleaseComObject(root);
}
if (condition != null)
{
Marshal.ReleaseComObject(condition);
}
if (elementArray != null)
{
Marshal.ReleaseComObject(elementArray);
}
}
return(elements);
}
