How to set the height of a window using c#?

Question

Is it possible to set the height of a window using the window handle or process handle?

I have the following so far, assume the application in question is notepad.

Answer 1

You should be able to use the Win32 SetWindowPos function (use for both position and size). Here's a link for how to do it in C#.

Here's a quick sample. This will move notepad to (10,10) on the screen, and resize it to (450,450):

class Program
{
    [DllImport("user32.dll")]
    [return: MarshalAs(UnmanagedType.Bool)]
    static extern bool SetWindowPos(IntPtr hWnd, IntPtr hWndInsertAfter, int X, int Y, int cx, int cy, SetWindowPosFlags uFlags);

    static void Main(string[] args)
    {
        Console.WriteLine("Start notepad and hit any key...");
        Console.ReadKey(true);
        Process[] processes = Process.GetProcessesByName("notepad");

        foreach (Process p in processes)
        {
            var handle = p.MainWindowHandle;

            SetWindowPos(handle, new IntPtr(SpecialWindowHandles.HWND_TOP), 10,10,450,450,SetWindowPosFlags.SWP_SHOWWINDOW);

            break;

        }

    }
}

public enum SpecialWindowHandles
{
    HWND_TOP = 0,
    HWND_BOTTOM = 1,
    HWND_TOPMOST = -1,
    HWND_NOTOPMOST = -2
}

[Flags]
public enum SetWindowPosFlags : uint
{
    SWP_ASYNCWINDOWPOS = 0x4000,

    SWP_DEFERERASE = 0x2000,

    SWP_DRAWFRAME = 0x0020,

    SWP_FRAMECHANGED = 0x0020,

    SWP_HIDEWINDOW = 0x0080,

    SWP_NOACTIVATE = 0x0010,

    SWP_NOCOPYBITS = 0x0100,

    SWP_NOMOVE = 0x0002,

    SWP_NOOWNERZORDER = 0x0200,

    SWP_NOREDRAW = 0x0008,

    SWP_NOREPOSITION = 0x0200,

    SWP_NOSENDCHANGING = 0x0400,

    SWP_NOSIZE = 0x0001,

    SWP_NOZORDER = 0x0004,

    SWP_SHOWWINDOW = 0x0040,
}