WPF C＃问题与获取passwordBox（x，y）的位置

Question

Good afternoon,

I need to get location of PasswordBox which is placed somewhere on my form called "LogInWindow.xaml", because I want to simulate psyhical/mouse click on that textBox.

I allready have function which is accepting two parameters, and which is doing click and those parameters are x & y which should be location of target control, here is the function:

  public static void LeftMouseClick(int xpos, int ypos)
    {
        SetCursorPos(xpos, ypos);
        mouse_event(MOUSEEVENTF_LEFTDOWN, xpos, ypos, 0, 0);
        mouse_event(MOUSEEVENTF_LEFTUP, xpos, ypos, 0, 0);
    }

so what I am missing here is xpos and ypos (coordinates of target control) and here is one of the ways I tried to get positions but its not working unfortunately:

Point relativePoint = txtPassword.TransformToAncestor(Application.Current.MainWindow)
                       .Transform(new Point(0, 0));

I got error on txtPassword that says: Error 14 A field initializer cannot reference the non-static field, method, or property 'Main.LogInWindow.txtPassword'

I finally made this working by following @FrancisLord advice.

But now I am facing another issue , I wanted to test this on another computer/monitor, and I copied my .exe file and I saw that this is not working on another machine, on my developer machine I saw that my function LeftMouseClick is working fine because its triggering "button1" that I am looking for, and on another machine looks like its not simulating click, maybe it can't find position of button1 or whatever :// :/// Here is my code:

private void Window_Loaded(object sender, RoutedEventArgs e)
    {


        relativePoint = this.button1.TransformToAncestor(this)
                           .Transform(new Point(0, 0));

        LeftMouseClick((int)relativePoint.X, (int)relativePoint.Y);

    //restOFcode
 }

Answer 1

It would look by the error that you are trying to assign the value of relativePoint through a filed initializer (that is when you set a value to a class level variable in it's declaration), which you cannot do if it calls methods or properties. What you should do here is declare that filed at the class level like right now, but assign it's s value in the constructor of your form's class :

public class MyForm : Window
{
    Point relativePoint;

    public MyForm() 
    {
        //other code already in the constructor

        relativePoint = txtPassword.TransformToAncestor(Application.Current.MainWindow)
                   .Transform(new Point(0, 0));
    }
}

PS: sorry if the class name or inheritance don't make sense, I don't know what it's supposed to look like for WPF

Answer 2

Use this line to get position from window

Point locationFromWindow = txtPassword.TranslatePoint(new Point(0, 0), Application.Current.MainWindow);

add this line to get position from screen

Point locationFromScreen = txtPassword.PointToScreen(locationFromWindow);