This article explains how to find and close the window using Win API .
Find and Close the Window
Find the Window
FindWindow function retrieves a handle to the top-level window whose class name and window name match the specified strings. This function does not search child windows. This function does not perform a case-sensitive search.
FindWindow(string lpClassName,string lpWindowName)
Finding ClassName and WindowName using Spy++
Spy++ (SPYXX.EXE) is a Win32-based utility that gives you a graphical view of the system's processes, threads, windows, and window messages. With the Window Finder Tool, you can find the properties of a selected window.
Step 1: Arrange your Windows so that Spy++ and the subject window are visible.
Step 2: From the Spy menu, choose Find Window to open the Find Window dialog box.
Step 3: Drag the Finder Tool to the desired window. As you drag the tool, window details display in the dialog box. (Handle, Caption(Window Name), Class Name)
public static extern int FindWindow(string lpClassName,string lpWindowName);
public static extern int SendMessage(int hWnd, uint Msg, int wParam, int lParam);
public const int WM_SYSCOMMAND = 0x0112;
public const int SC_CLOSE = 0xF060;
private void closeWindow()
int iHandle = FindWindow("Notepad", "Untitled - Notepad");
if (iHandle > 0)
SendMessage(iHandle, WM_SYSCOMMAND, SC_CLOSE, 0);
- 19th December, 2007: Initial post