Are you looking for fun with application running on your windows OS??? . So WinAPI is a way by which you can get control over applications and their windows. Believe me you can do lot of fun, like minimize a window from another application made by you. You can close notepad from another application.
Win 32 API is combination of mainly 3 DLL’s They Are
User32.dll - handles user interface stuff ,Like UI windows and functionality.
Kernel32.dll - file operations, memory management .
Gdi32.dll - involved in graphical .
Let’s start with Example: Let us suppose I want to close or minimize all window open in Desktop
Step 1: Use Name space “using System.Runtime.InteropServices;”
Step2: Import DLL’s declaring methods of corresponding like this.
For more details about different functions, Please visit this link: http://msdn.microsoft.com/en-us/library/windows/desktop/ms633548(v=vs.85).aspx.
Step3: call method in your app where ever required
Full code for minimizing all open window and undo the same in C#:
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using System.Runtime.InteropServices;
namespace WindowsAPI_C_SHARP
{
public partial class Form1 : Form
{
//Importing DLL's
[DllImport("User32.dll")]
public static extern Int32 FindWindow(String lpClassName, String lpWindowName);
[DllImport("user32.dll", EntryPoint = "SendMessage", SetLastError = true)]
static extern IntPtr SendMessage(Int32 hWnd, Int32 Msg, int wParam, IntPtr lParam);
int flag = 0;
public Form1()
{
InitializeComponent();
}
private void btn_minimize_Click(object sender, EventArgs e)
{
if(flag==0)
{
minimise_All_open_window();
flag = 1;
}
else
{
undo_minimise_All_open_window();
flag = 0;
}
}
void minimise_All_open_window()
{
const int WM_COMMAND = 0x111;
const int MIN_ALL = 419;
//const int MIN_ALL_UNDO = 416;
Int32 lHwnd = FindWindow("Shell_TrayWnd", null);
SendMessage(lHwnd, WM_COMMAND, MIN_ALL, IntPtr.Zero);
}
void undo_minimise_All_open_window()
{
const int WM_COMMAND = 0x111;
//const int MIN_ALL = 419;
const int MIN_ALL_UNDO = 416;
Int32 lHwnd = FindWindow("Shell_TrayWnd", null);
SendMessage(lHwnd, WM_COMMAND, MIN_ALL_UNDO, IntPtr.Zero);
}
}
}
