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POPInvoke errors calling external SetWindowsHookEx and GetModuleHandle
 

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  1. POPInvoke errors calling external SetWindowsHookEx and GetModuleHandle
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    <p>I am trying to set windows hooks in my program to an external EXE. This will be used to monitor resizing/minimizing of the window, so I can resize my program similarly, docking to the window. </p> <p>How do I get around error codes <strong>1428</strong> and <strong>126</strong> below?</p> <p>When calling <strong>SetWindowsHookEx</strong> with a null hMod, I was getting this error <strong>1428</strong>. I get the same error if passing the current module (instead of IntPtr.Zero), which it seems to get correctly, as so:</p> <pre><code>IntPtr module = PInvoke.GetModuleHandle(null); [...] SetWindowsHookEx(...,...,module,...); int error = PInvoke.GetLastError(); </code></pre> <p><strong>1428</strong> = <em>Cannot set nonlocal hook without a module handle</em></p> <p>I also tried to grab the external program I'm hooking as a module using <strong>GetModuleHandle</strong>:</p> <pre><code>IntPtr module = PInvoke.GetModuleHandle("communicator.exe"); int error = PInvoke.GetLastError(); </code></pre> <p>But <strong>error</strong> is then set to:</p> <p><strong>126</strong> = <em>The specified module could not be found.</em></p> <p>I am using the following PInvoke statements:</p> <pre><code>[DllImport("kernel32.dll", CharSet = CharSet.Auto, SetLastError = true)] public static extern IntPtr GetModuleHandle(string lpModuleName); [DllImport("user32.dll", SetLastError = true)] public static extern IntPtr SetWindowsHookEx(HookType hookType, HookProc lpfn, IntPtr hMod, uint dwThreadId); </code></pre> <p>This is the procedure that is having the issue:</p> <pre><code>public void Install(IntPtr hWnd) { uint threadId; uint processId; if (hWnd == IntPtr.Zero) { threadId = (uint)AppDomain.GetCurrentThreadId(); throw new Exception("Lync thread not found!"); } else { threadId = PInvoke.GetWindowThreadProcessId(hWnd, out processId); } //IntPtr module = PInvoke.GetModuleHandle(null); //IntPtr module = PInvoke.GetModuleHandle(GetType().Module.FullyQualifiedName); IntPtr module = PInvoke.GetModuleHandle("communicator.exe"); int error = PInvoke.GetLastError(); m_hhook = PInvoke.SetWindowsHookEx( m_hookType, m_filterFunc, //Process.GetCurrentProcess().Handle, //threadId); //IntPtr.Zero, //module, //Marshal.GetHINSTANCE( // System.Reflection.Assembly.GetExecutingAssembly().GetModules()[0] // ).ToInt32() module, threadId); //IntPtr hinst = Marshal.GetHINSTANCE(Process.GetCurrentProcess().Handle); // http://msdn.microsoft.com/en-us/library/ms681385 // ERROR_HOOK_NEEDS_HMOD - 1428 = Cannot set nonlocal hook without a module handle error = PInvoke.GetLastError(); } </code></pre>
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    1. COYou left the important bits out but the error code is clear enough, you cannot set global hooks with C# code.
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    2. COWhat is the alternative? Do I have to write an external C++ DLL to handle it?
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    3. COAlso I thought providing a Thread ID to SetWindowsHookEx makes it a Thread Hook--not a global hook--so I thought it would be allowed.
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