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POWindows Forms Desktop Application Bar Not Responding
 

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  1. POWindows Forms Desktop Application Bar Not Responding
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    <p>I would have given some indication as to the actual issue in the title, but I can't figure out what it is. All I can state is that the form, when implementing the appbar, no longer responds after I attempt to assign a value to a variable, thereby causing me to have to stop debugging and restart the machine to regain the desktop working area. The location of the error is noted in the code below, and I have only listed the code to the point of the error. Is there anything blatantly obvious here that I do not see?</p> <pre><code>static class Program { [STAThread] static void Main() { Application.EnableVisualStyles(); Application.SetCompatibleTextRenderingDefault(false); Application.Run(new Form1()); } } public partial class Form1 : AppBar { public Form1() : base() { InitializeComponent(); } //This is a button on the test form. //When clicked, the form should become a desktop application bar //docked to the top of the desktop. private void t_Click(object sender, EventArgs e) { base.SET_APPBAR(); } } public class AppBar : Form { protected internal Size appbarSize; protected internal Point appbarLocation; protected internal bool appbarMode; private EDGES appbarEdge; private RECT appbarRect; private uint ID { get; private set; } private IntPtr HANDLE { get; private set; } //constructor public AppBar() : base () //no issues here { appbarEdge = EDGES.ABE_TOP; appbarRect = new RECT(); ID = 0; HANDLE = this.Handle; appbarMode = false; } protected internal void SET_APPBAR() { if (IS_NEW()) { QUERY_AND_SET_POSITION(ref appbarRect); //Never get to here } } private bool IS_NEW() { if (appbarMode) //so far, so good { return false; } while (ID == 0) { CREATE_ID(); //ID is created, I have verified this. } this.FormBorderStyle = FormBorderStyle.FixedToolWindow; //BorderStyle does change appbarSize = this.Size; //Size is correct appbarLocation = this.Location; //still no issues NEW(); //this is where the error begins (see code further down) return appbarMode; //Never get here } private void CREATE_ID() { ID = Hooks.RegisterWindowMessage(Guid.NewGuid().ToString()); } private void QUERY_AND_SET_POSITION(ref RECT appbarRect) { SET_APPBAR_SIZE(ref appbarRect); QUERY_POS(ref appbarRect); APPBAR_RESIZE(ref appbarRect); SET_POS(ref appbarRect); this.Location = new Point(appbarRect.left, appbarRect.top); appbarSize = new Size(appbarRect.right - appbarRect.left, appbarRect.bottom - appbarRect.top); this.Size = appbarSize; } private void SET_APPBAR_SIZE(ref RECT appbarRect) { switch (appbarEdge) { case (EDGES.ABE_BOTTOM): appbarRect.left = 0; appbarRect.right = SystemInformation.PrimaryMonitorSize.Width; appbarRect.top = SystemInformation.PrimaryMonitorSize.Height - appbarSize.Height; appbarRect.bottom = SystemInformation.PrimaryMonitorSize.Height; break; case (EDGES.ABE_LEFT): appbarRect.left = 0; appbarRect.right = appbarSize.Width; appbarRect.top = 0; appbarRect.bottom = SystemInformation.PrimaryMonitorSize.Height; break; case (EDGES.ABE_RIGHT): appbarRect.left = SystemInformation.PrimaryMonitorSize.Width - appbarSize.Width; appbarRect.right = SystemInformation.PrimaryMonitorSize.Width; appbarRect.top = 0; appbarRect.bottom = SystemInformation.PrimaryMonitorSize.Height; break; default: appbarRect.left = 0; appbarRect.right = SystemInformation.PrimaryMonitorSize.Width; appbarRect.top = SystemInformation.WorkingArea.Top; appbarRect.bottom = appbarSize.Height; break; } } private void APPBAR_RESIZE(ref RECT appbarRect) { switch (appbarEdge) { case (EDGES.ABE_TOP): appbarRect.bottom = appbarRect.top + appbarSize.Height; break; case (EDGES.ABE_BOTTOM): appbarRect.top = appbarRect.bottom - appbarSize.Height; break; case (EDGES.ABE_LEFT): appbarRect.right = appbarRect.left + appbarSize.Width; break; case (EDGES.ABE_RIGHT): appbarRect.left = appbarRect.right - appbarSize.Width; break; } } private void APPBAR_CALLBACK(ref Message apiMessage) { switch ((NOTIFICATIONS)(uint)apiMessage.WParam)//? on int vs uint here { case (NOTIFICATIONS.ABN_STATECHANGE): STATE_CHANGE(); break; case (NOTIFICATIONS.ABN_POSCHANGED): QUERY_AND_SET_POSITION(ref appbarRect); break; case (NOTIFICATIONS.ABN_FULLSCREENAPP): if ((int)apiMessage.LParam != 0) { this.SendToBack(); this.TopMost = false; } else { STATE_CHANGE(); } break; case (NOTIFICATIONS.ABN_WINDOWARRANGE): //first call if ((int)apiMessage.LParam != 0) { this.Visible = false; } //second call else { this.Visible = true; } break; } } protected override void WndProc(ref Message apiMessage) { if (appbarMode) { if (HANDLE == apiMessage.HWnd) { APPBAR_CALLBACK(ref apiMessage); } else if (apiMessage.Msg == (int)API_MESSAGES.WM_ACTIVATE) { ACTIVATE(); } else if (apiMessage.Msg == (int)API_MESSAGES.WM_WINDOWPOSCHANGED) { WINDOW_POS_CHANGED(); } } base.WndProc(ref apiMessage); } private void NEW() { APPBARDATA data = new APPBARDATA(); //no apparent issue data.cbSize = (uint)Marshal.SizeOf(data); //no apparent issue data.hWnd = HANDLE; //no apparent issue data.uCallbackMessage = ID; //no apparent issue if (Hooks.SHAppBarMessage((uint)DWORD.ABM_NEW, ref data) != 0) //SHAppBar returns 1 (true) { //no issue if I were to place a MessageBox here appbarMode = true; // why in the world is this causing an issue????? //can't do anything from this point } } } public static class Hooks { [DllImport("shell32.dll", EntryPoint = "SHAppBarMessage")] public static extern uint SHAppBarMessage(uint dwMessage, ref APPBARDATA pData); [DllImport("user32.dll", EntryPoint = "RegisterWindowMessage")] public static extern uint RegisterWindowMessage( [MarshalAs(UnmanagedType.LPTStr)] string lpString); } </code></pre> <p>After whatever the issue is occurs, I can't click on any button or close the form. Desktop working area is always appropriately resized. Hopefully all of this makes sense to someone. Thanks for looking in advance.</p>
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