private void StartAppWatcher(string elementName, FindWindowMethod method)
{
windowElement = GetAppElement(elementName, method);
// (...)
// You may want to to something if the watched application is already running when you start your app
Automation.AddAutomationEventHandler(WindowPattern.WindowOpenedEvent, AutomationElement.RootElement,
TreeScope.Subtree, (elm, e) => {
AutomationElement element = elm as AutomationElement;
try
{
if (element == null || element.Current.ProcessId == currentProcessId)
{
return;
}
if (windowElement == null)
{
windowElement = GetAppElement(elementName, method);
}
if (windowElement == null || windowElement.ProcessId != element.Current.ProcessId)
{
return;
}
// If the Window is a MessageBox generated by the watched app, attach the handler
if (element.Current.ClassName == "#32770")
{
buttonElement = element;
var msgBoxButton = element.FindFirst(TreeScope.Descendants,
new PropertyCondition(AutomationElement.NameProperty, "OK"));
if (msgBoxButton != null && msgBoxButton.GetSupportedPatterns().Any(p => p.Equals(InvokePattern.Pattern)))
{
Automation.AddAutomationEventHandler(
InvokePattern.InvokedEvent, msgBoxButton, TreeScope.Element,
DialogButtonHandler = new AutomationEventHandler(MessageBoxButtonHandler));
}
}
}
catch (ElementNotAvailableException) {
// Ignore: this exception may be raised if you show a modal dialog,
// in your own app, that blocks the execution. When the dialog is closed,
// AutomationElement element is no longer available
}
});
Automation.AddAutomationEventHandler(WindowPattern.WindowClosedEvent, AutomationElement.RootElement,
TreeScope.Subtree, (elm, e) => {
AutomationElement element = elm as AutomationElement;
if (element == null || element.Current.ProcessId == currentProcessId || windowElement == null)
{
return;
}
if (windowElement.ProcessId == element.Current.ProcessId)
{
if (windowElement.MainWindowTitle == element.Current.Name)
{
windowElement = null;
}
}
});
}
private ElementWindow GetAppElement(string elementName, FindWindowMethod method)
{
Process proc = null;
try {
switch (method)
{
case FindWindowMethod.ProcessName:
proc = Process.GetProcessesByName(elementName).FirstOrDefault();
break;
case FindWindowMethod.Caption:
proc = Process.GetProcesses().FirstOrDefault(p => p.MainWindowTitle == elementName);
break;
}
return(CreateElementWindow(proc));
}
finally {
proc?.Dispose();
}
}
