Get the Active Window?

Question

I'm trying to find the active window for a small screenshot program I'm building. I believe I just need its dimensions. I've tried googleing it forever now but can't find anything that means anything to me. I'd appreciate any help I can get thanks!

Adam Turner · Answer

Very cool! Thanks so much!

Alan · Answer

Try this console app: using System; using System.Runtime.InteropServices; using System.Threading; using System.Text; [StructLayout(LayoutKind.Sequential)] public struct RECT { public int Left; public int Top; public int Right; public int Bottom; public int Width { get{return Right - Left;} } public int Height { get{return Bottom - Top;} } } class Program { [DllImport(user32.dll)] static extern IntPtr GetForegroundWindow(); [DllImport(user32.dll)] static extern int GetWindowTextLength(IntPtr hWnd); [DllImport(user32.dll CharSet = CharSet.Auto)] static extern int GetWindowText(IntPtr hWnd StringBuilder lpString int nMaxCount); [DllImport(user32.dll)] static extern int GetWindowRect(IntPtr hWnd out RECT rect); static void Main() { Console.WriteLine(You have 5 seconds to make another window active); Console.WriteLine(otherwise dimensions will be for this console window); Thread.Sleep(5000); IntPtr hWnd = GetForegroundWindow(); int length = GetWindowTextLength(hWnd); StringBuilder sb = new StringBuilder(length +1); GetWindowText(hWnd sb sb.Capacity); RECT rect; GetWindowRect(hWnd out rect); Console.WriteLine(
Active window title is '{0}' sb.ToString()); Console.WriteLine(Width is {0} pixelsrect.Width); Console.WriteLine(Height is {0} pixels rect.Height); } }