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POCalling SendMessage (P/Invoke) keeps crashing
 

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    <p>I am having to write an application that communicates with a third-party program (<a href="http://en.wikipedia.org/wiki/AOL" rel="nofollow noreferrer">AOL</a>, I'm sorry. :()</p> <p>Doing a lot of research I found some ways to do this with <a href="http://en.wikipedia.org/wiki/Platform_Invocation_Services" rel="nofollow noreferrer">P/Invoke</a>, and for the most part it <em>works</em> okay, but it crashes upon subsequent trials, specifically with <code>SendMessage</code>. I'm outlining the crashing code below.</p> <p>All of this was ported to <a href="http://en.wikipedia.org/wiki/.NET_Framework" rel="nofollow noreferrer">.NET</a> from old, old Visual Basic files. It's archaic as it can be, and I understand if it's not doable - I was just hoping there was a better way than Visual Basic 4.0 to get this done.</p> <pre><code>[DllImport("kernel32.dll", SetLastError = true)] [return: MarshalAs(UnmanagedType.Bool)] public static extern bool CloseHandle(IntPtr hObject); [DllImport("user32.dll", SetLastError = true)] public static extern IntPtr FindWindow(string lpClassName, string lpWindowName); [DllImport("user32.dll", SetLastError = true)] public static extern IntPtr FindWindowEx(IntPtr hwndParent, IntPtr hwndChildAfter, string lpszClass, string lpszWindow); [DllImport("user32.dll", SetLastError = true)] public static extern IntPtr FindWindowEx(IntPtr parentHandle, IntPtr childAfter, string className, IntPtr windowTitle); [DllImport("user32.dll", CharSet = CharSet.Auto)] public static extern IntPtr SendMessage(HandleRef hWnd, UInt32 Msg, IntPtr wParam, IntPtr lParam); [DllImport("user32.dll", EntryPoint="SendMessageW")] public static extern IntPtr SendMessageByString(HandleRef hWnd, UInt32 Msg, IntPtr wParam, StringBuilder lParam); [DllImport("user32.dll", CharSet = CharSet.Unicode , EntryPoint = "SendMessageW")] public static extern IntPtr SendMessageByString(HandleRef hWnd, UInt32 Msg, IntPtr wParam, String lParam); public IntPtr FindClientWindow() { IntPtr aol = IntPtr.Zero; IntPtr mdi = IntPtr.Zero; IntPtr child = IntPtr.Zero; IntPtr rich = IntPtr.Zero; IntPtr aollist = IntPtr.Zero; IntPtr aolicon = IntPtr.Zero; IntPtr aolstatic = IntPtr.Zero; aol = Invoke.FindWindow("AOL Frame25", null); mdi = Invoke.FindWindowEx(aol, IntPtr.Zero, "MDIClient", null); child = Invoke.FindWindowEx(mdi, IntPtr.Zero, "AOL Child", null); rich = Invoke.FindWindowEx(child, IntPtr.Zero, "RICHCNTL", null); aollist = Invoke.FindWindowEx(child, IntPtr.Zero, "_AOL_Listbox", null); aolicon = Invoke.FindWindowEx(child, IntPtr.Zero, "_AOL_Icon", null); aolstatic = Invoke.FindWindowEx(child, IntPtr.Zero, "_AOL_Static", null); if (rich != IntPtr.Zero &amp;&amp; aollist != IntPtr.Zero &amp;&amp; aolicon != IntPtr.Zero &amp;&amp; aolstatic != IntPtr.Zero) return child; do { child = Invoke.FindWindowEx(mdi, child, "AOL Child", null); rich = Invoke.FindWindowEx(child, IntPtr.Zero, "RICHCNTL", null); aollist = Invoke.FindWindowEx(child, IntPtr.Zero, "_AOL_Listbox", null); aolicon = Invoke.FindWindowEx(child, IntPtr.Zero, "_AOL_Icon", null); aolstatic = Invoke.FindWindowEx(child, IntPtr.Zero, "_AOL_Static", null); if (rich != IntPtr.Zero &amp;&amp; aollist != IntPtr.Zero &amp;&amp; aolicon != IntPtr.Zero &amp;&amp; aolstatic != IntPtr.Zero) return child; } while (child != IntPtr.Zero) ; return child; } IntPtr room = IntPtr.Zero; IntPtr child = IntPtr.Zero; IntPtr length = IntPtr.Zero; IntPtr roomHandle = IntPtr.Zero; child = FindClientWindow(); room = FindChildByClass(child, "RICHCNTLREADONLY"); HandleRef n = new HandleRef(IntPtr.Zero, room); length = SendMessage(n, 0x000E, IntPtr.Zero, IntPtr.Zero); // This is the line that keeps crashing on me. SendMessageByString(n, 0x000D, new IntPtr( length.ToInt32() + 1 ), str); public IntPtr FindChildByClass(IntPtr parent, string child) { return Invoke.FindWindowEx(parent, IntPtr.Zero, child, null); } </code></pre>
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    1. USPeter Mortensen
    1. USCiel
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    1. COCan you add more code, specifically, what's n, the hexdecimal number, length and string? Did you look at http://pinvoke.net/default.aspx/user32/SendMessage.html?
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    2. COsure, I added all of it for you. I'll add the other pinvokes, too.
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    3. COyes, pinvoke.net is where i got the signature from originally.
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      1. USCiel
 

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