Resize other window or application c#

Question

I'm trying to resize a window to the resolution 1280x720 with c#. How can I make it? I've tried a lot of codes posted here in stack and the closest result I've got was this:

using System; using System.Diagnostics; using System.Runtime.InteropServices; namespace ConsoleApplication1 { class Program { [StructLayout(LayoutKind.Sequential)] public struct RECT { public int left; public int top; public int right; public int bottom; } [DllImport("user32.dll", SetLastError = true)] static extern bool GetWindowRect(IntPtr hWnd, ref RECT Rect); [DllImport("user32.dll", SetLastError = true)] static extern bool MoveWindow(IntPtr hWnd, int X, int Y, int Width, int Height, bool Repaint); static void Main(string[] args) { Process[] processes = Process.GetProcessesByName("notepad"); foreach (Process p in processes) { IntPtr handle = p.MainWindowHandle; RECT Rect = new RECT(); if (GetWindowRect(handle, ref Rect)) MoveWindow(handle, Rect.left, Rect.right, Rect.right-Rect.left, Rect.bottom-Rect.top + 50, true); } } } }

Thanks for your time.

You have Rect.right where you should have Rect.top, which is why the window moves off the screen sometimes. — LarsTech
– LarsTech, Commented Aug 27, 2015 at 22:39

shf301 · Accepted Answer · 2015-08-27 22:35:33Z

8

If you want the window to have a size of 1280x720 then use that size in the MoveWindow call.

 MoveWindow(handle, Rect.left, Rect.top, 1280, 720, true);

edited Aug 27, 2015 at 22:35

answered Aug 27, 2015 at 22:30

shf301

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8 Comments

shf301 Over a year ago

Updated my answer, you want to pass the Left and Top to MoveWindow to keep the Window from moving.

David Amaral Over a year ago

Cool. But How can I center it in the screen after resizing?

David Amaral Over a year ago

Thanks for your time, really apreciated.

David Amaral Over a year ago

That code doesn't work. It says Unrecognized escape sequence "\".

Drarig29 Over a year ago

Try with /. The \ operator is used in vb.net to return an integer result, and not a floating-point result but it doesn't exist in c#.

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Drarig29 · Accepted Answer · 2015-08-28 11:23:28Z

In response to David Amaral, to center the window, use this :

MoveWindow(handle, (Screen.PrimaryScreen.WorkingArea.Width - 1280) / 2, (Screen.PrimaryScreen.WorkingArea.Height - 720) / 2, 1280, 720, true);

By the way, here's the code in vb.net for persons who want :

Private Sub Button1_Click(sender As Object, e As EventArgs) Handles Button1.Click Dim processes As Process() = Process.GetProcessesByName("notepad") For Each p As Process In processes Dim handle As IntPtr = p.MainWindowHandle Dim Rect As New RECT() If GetWindowRect(handle, Rect) Then MoveWindow(handle, (My.Computer.Screen.WorkingArea.Width - 1280) \ 2, (My.Computer.Screen.WorkingArea.Height - 720) \ 2, 1280, 720, True) End If Next End Sub <StructLayout(LayoutKind.Sequential)> _ Public Structure RECT Public left As Integer Public top As Integer Public right As Integer Public bottom As Integer End Structure <DllImport("user32.dll", SetLastError:=True)> _ Private Shared Function GetWindowRect(hWnd As IntPtr, ByRef Rect As RECT) As Boolean End Function <DllImport("user32.dll", SetLastError:=True)> _ Private Shared Function MoveWindow(hWnd As IntPtr, X As Integer, Y As Integer, Width As Integer, Height As Integer, Repaint As Boolean) As Boolean End Function

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