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i want to clicked the save button of another application from my c# application.if there is data in that application then save dialogbox will appear while in absence of data message box will appear.After i want to give the filename as date and time similarly i want to click the ok button for messagebox.

i did it using 3 button save,enter filename button and ok button but the problem is when i clicked the save button window is changed to either save dialogbox or message box after that my c# application freezed. if i restart c# application it will work.how to solve this?
if possible i want to do it using single button.

What I have tried:

[DllImport("user32.dll", SetLastError = true)]
private static extern IntPtr FindWindow(string lpClassName, string lpWindowName);
[DllImport("user32.dll")]static public extern bool GetWindowRect(IntPtr hWnd, out Rectangle lpRect);
 [DllImport("user32.dll")]
private static extern IntPtr FindWindowEx(IntPtr hwndParent, IntPtr hwndChildAfter, string lpClassName, string lpWindowName);
[DllImport("user32.dll")]
 private static extern int SendMessage(IntPtr hWnd, int wMsg, IntPtr wParam, IntPtr lParam);
[DllImport("user32.dll")]
 private static extern int SendNotifyMessage(IntPtr hWnd, int wMsg, IntPtr wParam, IntPtr lParam);
 [DllImport("User32.dll", CharSet = CharSet.Auto)]
 private static extern int SetForegroundWindow(IntPtr points);
 [DllImport("user32.dll")]
 private static extern bool PostMessage(IntPtr hWnd, int Msg, int wParam, int lParam);
//save button
private void saveBtn_Click(object sender, EventArgs e)
  {
    IntPtr maindHwnd = FindWindow(null, "app1");
    IntPtr maindHwnd1 = FindWindow(null, "Error");
    if (maindHwnd != IntPtr.Zero)
    {
     IntPtr panel = FindWindowEx(maindHwnd, IntPtr.Zero, "MDIClient", null);
     IntPtr panel1 = FindWindowEx(panel, IntPtr.Zero, "TAveForm", null);
     IntPtr panel2 = FindWindowEx(panel1, IntPtr.Zero, "TPanel", "Panel5");
     IntPtr panel3 = FindWindowEx(panel2, IntPtr.Zero, "TPanel", null);
     IntPtr childHwnd = FindWindowEx(panel3, IntPtr.Zero, "TBitBtn", "Save");
  if (childHwnd != IntPtr.Zero)
     {
      SendMessage(childHwnd, BM_CLICK, IntPtr.Zero, IntPtr.Zero);
     }
   }
  }

//click messagebox
private void button4_Click(object sender, EventArgs e)
  {
    IntPtr hWnd = FindWindow(null, "Error");
    if (hWnd != IntPtr.Zero)
    {
      IntPtr childHwnd = FindWindowEx(hWnd, IntPtr.Zero, "Button", "Ok"); 
     if (childHwnd != IntPtr.Zero)
      {
        SendMessage(childHwnd, BM_CLICK, IntPtr.Zero, IntPtr.Zero); 
        }
      else
      {
        textBox3.BackColor = Color.Yellow;
        textBox3.Text = "error;
                }
         }
         else
         {
          textBox3.BackColor = Color.Yellow;
        textBox3.Text = "hmd is zero";
         }
        }


 //save dialogbox
String textBox = DateTime.Now.ToString("yyyyMMdd_HH-mm-ss");
  IntPtr maindHwnd = FindWindow(null, "save");
    IntPtr hWnd = FindWindow(null, "Error");
   if (maindHwnd != IntPtr.Zero)
    {
   {
     IntPtr panel = FindWindowEx(maindHwnd, IntPtr.Zero, "ComboBoxEx32", null);
      IntPtr panel1 = FindWindowEx(panel, IntPtr.Zero, "ComboBox", null);
      IntPtr panel2 = FindWindowEx(panel1, IntPtr.Zero, "Edit", null);
       if (panel2 != IntPtr.Zero)
        {

          SendKeys.Send(textBox);
                       
         }

                }
Posted
Updated 28-Feb-22 14:54pm
v2

1 solution

Hi,

SendMessage
waits for a reply by the addressee, which is OK for most purposes; however it is the wrong choice for sending a "stop all activity" command, as the destination will obey and not reply, causing your sending app to hang forever.

Solution: a quit command, such as clicking the close box of another app's main form, should be sent with
PostMessage()


:)

PS: an alternative and more complex approach, which I don't recommend in general, is to make sure the destination app's main window is frontmost, fully visible, and then issuing a Mouse command on the close box, using SendInput().
   
v2

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