get process ids of all running window form applications

Question

1.00/5 (1 vote)

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.NET2.0

I have an assignment in which I have 3 window form applications and all in running mode. First application is active on screen and other two are minimized. i have a form in first(active) application which contains a listbox. This listbox contains names of other two applications.
The task is : if I double click on any name(means name of second or third window form application) in the listbox, that particular window form application should switch its state from minimized state to active. Means that window form application should now appear on the screen.
i think for this I need to have process ids of the other two(second and third window form applications).if it is so then how do i do that. if not then please suggest me some other solution.
Please help ~~its urgent.~~

Posted 1-May-11 22:22pm

Varshney Manish

Updated 1-May-11 22:29pm

walterhevedeich

v2

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3 solutions

Solution 3

You don't need process IDs - you need window handles:

[DllImport("user32.dll")]
public static extern IntPtr FindWindow(String sClassName, String sAppName);
[DllImport("user32")]
private const int SW_SHOWNORMAL    = 1;
private const int SW_SHOWMINIMIZED = 2;
private const int SW_SHOWMAXIMIZED = 3;
private static extern int ShowWindow(int hwnd, int nCmdShow);
private void butMakeNotePadFullScreen_Click(object sender, EventArgs e)
    {
    IntPtr hWnd = FindWindow(null, "Untitled - Notepad");
    ShowWindow((int) hWnd, SW_SHOWMAXIMIZED);
    }

Posted 1-May-11 23:05pm

OriginalGriff

Comments

Olivier Levrey 2-May-11 8:06am

Best answer here. Have my 5.

Solution 1

This is not about IDs. This is just incredibly poor design. Do you have source code for all applications? If so you really need to re-work them into one application to be run in one process.

If not, it's not good. You can run "foreign" or "child" applications in your project using System.Diagnostics.Process.Start. The call will return the Process instance of the child process. After a while (this is already a problem, you may need some delay) you can get the HWND of the main window of the child process via Process.MainWindowHandle.

After that, use P/Invoke of Windows API functions to operate with HWND: SetForegroundWindow, SetActiceWindow, SetWindowsPlacement, SetWindowsPos. See http://msdn.microsoft.com/en-us/library/ms632595(v=vs.85).aspx[^].

—SA

Posted 1-May-11 22:48pm

Sergey Alexandrovich Kryukov

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RAJI @Codeproject · Accepted Answer · 2011-05-01T22:50:00

try this!

using System.Diagnostics;

Process[] processlist = Process.GetProcesses();

foreach(Process theprocess in processlist){
// u can access each process name // theprocess.ProcessName;
//process id// theprocess.Id;

//and an external window can maximized using

[DllImport("user32.dll")]
      private static extern bool IsIconic(IntPtr hWnd);
      [DllImport("user32.dll")]
      private static extern int ShowWindow(IntPtr hWnd, int nCmdShow);
      [DllImport("user32.dll")]
      private static extern int SetForegroundWindow (IntPtr hWnd);
      private const int SW_RESTORE = 9;
      private void ShowPID(int pId)///give your selected processid here
      {
          IntPtr hWnd = System.Diagnostics.Process.GetProcessById(pId).MainWindowHandle;
          if (!hWnd.Equals(IntPtr.Zero))
          {
              if (IsIconic(hWnd))
              {
                  ShowWindow(hWnd, SW_RESTORE);
              }
              SetForegroundWindow(hWnd);
          }
      }