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POMDI parent within another MDI parent form
 

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    <p>I am succeeded in opening MDI parent form within MDi parent form by using following method: I made two desktop applications(i.e. App1 and App2) having MDI parent forms as startup. In App1, I have added a panel on MDI parent in which we are going to open the other app i.e. App2. Now I added this code in App1.</p> <blockquote> <pre><code>using System.Diagnostics; using System.Runtime.InteropServices; </code></pre> </blockquote> <p>and </p> <blockquote> <pre><code>[DllImport("user32.dll")] static extern IntPtr SetParent(IntPtr hwndChild, IntPtr hwndNewParent); </code></pre> </blockquote> <pre><code> [DllImport("user32.dll", CharSet = CharSet.Auto, SetLastError = false)] static extern IntPtr SendMessage(IntPtr hWnd, Int32 Msg, Int32 wParam, Int32 lParam); </code></pre> <p>Now in button click event the following code is used.(App1)</p> <pre><code> // Create a new process Process proc; // Start the process proc = Process.Start(Application.StartupPath + @"\App2.exe"); ////proc = Process.Start("notepad.exe"); proc.WaitForInputIdle(); // Set the panel control as the application's parent SetParent(proc.MainWindowHandle, this.panel1.Handle); // Maximize application SendMessage(proc.MainWindowHandle, 274, 61488, 0); MessageBox.Show(Application.OpenForms[0].ToString()); </code></pre> <p>Here,Application.StartupPath + @"\App2.exe" is the process or EXE file which I built (Build solution, you know). Firstly,The code works fine when I debug with breakpoint but when I try to run it, the App2 opens as a different process but not in App1. Secondly, I cannot open form which i have added in App2 which is opened as MDI child form (app2).</p> <pre><code> Form1 frm = new Form1(); frm.MdiParent = Application.OpenForms[0]; frm.Show(); </code></pre> <p>This is how I open child forms in MDI forms.</p>
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    1. USDhavalR
    1. USDhavalR
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    1. COThis is supported by SetParent() because this was possible in Windows version 3. A version of Windows that didn't yet have processes and threads. The odds this still comes to a good end is inversely proportional to your program acting like a Windows 3.x program. After 20 years, those odds get low. The complete lack of error checking otherwise makes diagnosing problems impossible as well. Using SetLastError = true and throwing Win32Exception when the winapi function returned a failure code is required.
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      1. POMDI parent within another MDI parent form
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    2. COSo what changes i should make (bcoz I could not understand your comment totaly.)? Second I tried to open notepad.exe with the same method. It worked.
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      1. USDhavalR
    3. CO@hans Passnat: I changed my code to http://stackoverflow.com/questions/10102526/c-sharp-mainwindowhandle-always-zero and I am able to what I want. But I am still curious to know about your comment (just for knowledge.).
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      1. USDhavalR
 

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