Question

I saw this C++ code on a forum which minimizes all open windows

#define MIN_ALL        419 #define MIN_ALL_UNDO   416  int main(int argc, char* argv[]) {     HWND lHwnd = FindWindow('Shell_TrayWnd',NULL);     SendMessage(lHwnd,WM_COMMAND,MIN_ALL,0);     Sleep(2000);     SendMessage(lHwnd,WM_COMMAND,MIN_ALL_UNDO,0);     return 0; } 

How can I access the FindWindow and SendMessage API function and the HWND type in C#.net?

Answer 1

PInvoke.net is your friend 🙂

using System; using System.Runtime.InteropServices;  namespace ConsoleApplication1 { class Program {     [DllImport('user32.dll', EntryPoint = 'FindWindow', SetLastError = true)]     static extern IntPtr FindWindow(string lpClassName, string lpWindowName);     [DllImport('user32.dll', EntryPoint = 'SendMessage', SetLastError = true)]     static extern IntPtr SendMessage(IntPtr hWnd, Int32 Msg, IntPtr wParam, IntPtr lParam);      const int WM_COMMAND = 0x111;     const int MIN_ALL = 419;     const int MIN_ALL_UNDO = 416;      static void Main(string[] args) {         IntPtr lHwnd = FindWindow('Shell_TrayWnd', null);         SendMessage(lHwnd, WM_COMMAND, (IntPtr)MIN_ALL, IntPtr.Zero);          System.Threading.Thread.Sleep(2000);         SendMessage(lHwnd, WM_COMMAND, (IntPtr)MIN_ALL_UNDO, IntPtr.Zero);     } } }