Is it possible to activate a tab in another program using an IntPtr?
See the question and my original answer on StackOverflowAs others pointed out, the standard way of doing this is to use UI Automation. Notepad++ does support UI Automation (to some extent, as it's somehow automatically provided by the UI Automation Windows layers).
Here is a sample C# console app that demonstrates the following sceanrio (you need to reference UIAutomationClient.dll, UIAutomationProvider.dll and UIAutomationTypes.dll):
1) get the first running notepad++ process (you must start at least one)
2) open two files (note there may be already other opened tabs in notepad++)
3) selects all tabs in an infinite loop
class Program
{
static void Main(string[] args)
{
// this presumes notepad++ has been started somehow
Process process = Process.GetProcessesByName("notepad++").FirstOrDefault();
if (process == null)
{
Console.WriteLine("Cannot find any notepad++ process.");
return;
}
AutomateNpp(process.MainWindowHandle);
}
static void AutomateNpp(IntPtr handle)
{
// get main window handle
AutomationElement window = AutomationElement.FromHandle(handle);
// display the title
Console.WriteLine("Title: " + window.Current.Name);
// open two arbitrary files (change this!)
OpenFile(window, @"d:\my path\file1.txt");
OpenFile(window, @"d:\my path\file2.txt");
// selects all tabs in sequence for demo purposes
// note the user can interact with n++ (for example close tabs) while all this is working
while (true)
{
var tabs = GetTabsNames(window);
if (tabs.Count == 0)
{
Console.WriteLine("notepad++ process seems to have gone.");
return;
}
for (int i = 0; i < tabs.Count; i++)
{
Console.WriteLine("Selecting tab:" + tabs[i]);
SelectTab(window, tabs[i]);
Thread.Sleep(1000);
}
}
}
static IList<string> GetTabsNames(AutomationElement window)
{
List<string> list = new List<string>();
// get tab bar
var tab = window.FindFirst(TreeScope.Children, new PropertyCondition(AutomationElement.ControlTypeProperty, ControlType.Tab));
if (tab != null)
{
foreach (var item in tab.FindAll(TreeScope.Children, PropertyCondition.TrueCondition).OfType<AutomationElement>())
{
list.Add(item.Current.Name);
}
}
return list;
}
static void SelectTab(AutomationElement window, string name)
{
// get tab bar
var tab = window.FindFirst(TreeScope.Children, new PropertyCondition(AutomationElement.ControlTypeProperty, ControlType.Tab));
// get tab
var item = tab.FindFirst(TreeScope.Children, new PropertyCondition(AutomationElement.NameProperty, name));
if (item == null)
{
Console.WriteLine("Tab item '" + name + "' has been closed.");
return;
}
// select it
((SelectionItemPattern)item.GetCurrentPattern(SelectionItemPattern.Pattern)).Select();
}
static void OpenFile(AutomationElement window, string filePath)
{
// get menu bar
var menu = window.FindFirst(TreeScope.Children, new PropertyCondition(AutomationElement.ControlTypeProperty, ControlType.MenuBar));
// get the "file" menu
var fileMenu = menu.FindFirst(TreeScope.Children, new PropertyCondition(AutomationElement.NameProperty, "File"));
// open it
SafeExpand(fileMenu);
// get the new File menu that appears (this is quite specific to n++)
var subFileMenu = fileMenu.FindFirst(TreeScope.Children, new PropertyCondition(AutomationElement.ControlTypeProperty, ControlType.Menu));
// get the "open" menu
var openMenu = subFileMenu.FindFirst(TreeScope.Children, new PropertyCondition(AutomationElement.NameProperty, "Open..."));
// click it
((InvokePattern)openMenu.GetCurrentPattern(InvokePattern.Pattern)).Invoke();
// get the new Open dialog (from root)
var openDialog = WaitForDialog(window);
// get the combobox
var cb = openDialog.FindFirst(TreeScope.Children, new PropertyCondition(AutomationElement.ControlTypeProperty, ControlType.ComboBox));
// fill the filename
((ValuePattern)cb.GetCurrentPattern(ValuePattern.Pattern)).SetValue(filePath);
// get the open button
var openButton = openDialog.FindFirst(TreeScope.Children, new AndCondition(
new PropertyCondition(AutomationElement.ControlTypeProperty, ControlType.Button),
new PropertyCondition(AutomationElement.NameProperty, "Open")));
// press it
((InvokePattern)openButton.GetCurrentPattern(InvokePattern.Pattern)).Invoke();
}
static AutomationElement WaitForDialog(AutomationElement element)
{
// note: this should be improved for error checking (timeouts, etc.)
while(true)
{
var openDialog = element.FindFirst(TreeScope.Children, new PropertyCondition(AutomationElement.ControlTypeProperty, ControlType.Window));
if (openDialog != null)
return openDialog;
}
}
static void SafeExpand(AutomationElement element)
{
// for some reason, menus in np++ behave badly
while (true)
{
try
{
((ExpandCollapsePattern)element.GetCurrentPattern(ExpandCollapsePattern.Pattern)).Expand();
return;
}
catch
{
}
}
}
}
If you wonder how this has been made, then you must read about UI Automation. The mother of all tools is called Inspect: https://msdn.microsoft.com/library/windows/desktop/dd318521.aspx Make sure you get version at least 7.2.0.0. Note there is another one called UISpy but inspect is better.
Note, unfortunately, notepad++ tab text content - because it's based on the custom scintilla editor control - does not properly supports automation (we can't read from it easily, I suppose we'd have to use scintilla Windows messages for this), but it could be added to it (hey, scintilla guys, if you read this ... :).