Use GetForegroundWindow result in an if statement to check user's current window

I need to check what window the user currently has selected, and do stuff if they have a specific program selected.

I haven't used the GetForegroundWindow function before, and can't find any information on how to use it in this manner.

I simply need an if comparing the current window to see if its a specific program. However the GetForegroundWindow function doesn't give back a string or int it seems. So mainly I don't know how to find out the value of the program window I want to compare it to.

I currently have the code to get the current window:

 [DllImport("user32.dll")] private static extern IntPtr GetForegroundWindow(); IntPtr selectedWindow = GetForegroundWindow(); 

I need to be able to apply it as follows ideally:

 If (selectedWindow!="SpecificProgram") { <Do this stuff> } 

I'm hoping the GetForegroundWindow value/object is unique to each program and doesn't function in some way that each specific program/window has different values each-time.

I'm also doing this as part of a windows form though I doubt it matters.

-Thanks for any help

Edit: This way works, and uses the tile of the current window, which makes it perfect for checking if the window is right easily:

 [DllImport("user32.dll")] static extern IntPtr GetForegroundWindow(); [DllImport("user32.dll")] static extern int GetWindowText(IntPtr hWnd, StringBuilder text, int count); private string GetActiveWindowTitle() { const int nChars = 256; StringBuilder Buff = new StringBuilder(nChars); IntPtr handle = GetForegroundWindow(); if (GetWindowText(handle, Buff, nChars) > 0) { return Buff.ToString(); } return null; } 

and then I can just do:

 if (GetActiveWindowTitle()=="Name of Window") { DoStuff.jpg } 

1 Answer

It has some code but it works:

 #region Retrieve list of windows [DllImport("user32")] private static extern int GetWindowLongA(IntPtr hWnd, int index); [DllImport("USER32.DLL")] private static extern int GetWindowText(IntPtr hWnd, StringBuilder lpString, int nMaxCount); [DllImport("USER32.DLL")] private static extern bool EnumWindows(EnumWindowsProc enumFunc, int lParam); [DllImport("user32.dll")] private static extern IntPtr GetForegroundWindow(); private const int GWL_STYLE = -16; private const ulong WS_VISIBLE = 0x10000000L; private const ulong WS_BORDER = 0x00800000L; private const ulong TARGETWINDOW = WS_BORDER | WS_VISIBLE; internal class Window { public string Title; public IntPtr Handle; public override string ToString() { return Title; } } private List<Window> windows; private void GetWindows() { windows = new List<Window>(); EnumWindows(Callback, 0); } private bool Callback(IntPtr hwnd, int lParam) { if (this.Handle != hwnd && (GetWindowLongA(hwnd, GWL_STYLE) & TARGETWINDOW) == TARGETWINDOW) { StringBuilder sb = new StringBuilder(100); GetWindowText(hwnd, sb, sb.Capacity); Window t = new Window(); t.Handle = hwnd; t.Title = sb.ToString(); windows.Add(t); } return true; //continue enumeration } #endregion 

And to check user window:

 IntPtr selectedWindow = GetForegroundWindow(); GetWindows(); for (i = 0; i < windows.Count; i++) { if(selectedWindow == windows[i].Handle && windows[i].Title == "Program Title X") { //Do stuff break; } } 

Valter