在 C# 中使用控制台窗口时出现异常（Windows 窗体应用程序）

Question

我有一个程序 WFA，它也有命令窗口。我用 AllocConsole() 打开窗口；当我关闭控制台窗口时，我使用 FreeConsole();但是当我用 AllocConsole() 再次打开它时；我想从中写入和读取，它会引发异常。

代码：

    namespace WindowsFormsApplication2
{

class classx
{

    [DllImport("kernel32.dll")]
    public static extern Int32 AllocConsole();
    [DllImport("kernel32.dll")]
    public static extern bool FreeConsole();
    [DllImport("kernel32")]
    public static extern bool AttachConsole();
    [DllImport("kernel32")]
    public static extern bool GetConsoleWindow();
    public static bool z = false;
    [DllImport("kernel32")]
    public static extern bool SetConsoleCtrlHandler(HandlerRoutine HandlerRoutine, bool Add);
    public delegate bool HandlerRoutine(uint dwControlType);
}



public partial class Form1 : Form
{
    NotifyIcon icontask;
    Icon iconone_active;
    Icon iconone_inactive;
    /*Icon icontwo;
    Icon iconthree;
    Icon iconfour;
    Icon iconfive;*/
    Thread Threadworkermy;

    public Form1()
    {
        InitializeComponent();
        this.WindowState = FormWindowState.Minimized;
        this.ShowInTaskbar = false;
        iconone_active = new Icon(".../iconone_active.ico");
        iconone_inactive = new Icon(".../iconone_inactive.ico");
        icontask = new NotifyIcon();
        icontask.Icon = iconone_active;
        icontask.Visible = true;
        Threadworkermy = new Thread(new ThreadStart(checkActivityThread));
        Threadworkermy.Start();

        MenuItem Nameapp = new MenuItem("xr");
        MenuItem quitappitem = new MenuItem("quit program");
        MenuItem OpenGUI = new MenuItem("Open GUI");
        MenuItem Advancedmodewindow = new MenuItem("x");
        ContextMenu contextmenu = new ContextMenu();

        quitappitem.Click += quitappitem_click;
        OpenGUI.Click += OpenGUI_click;
        Advancedmodewindow.Click += Advancedmodewindow_click;
        contextmenu.MenuItems.Add(Nameapp);
        contextmenu.MenuItems[0].Enabled = false;
        contextmenu.MenuItems.Add("-");
        contextmenu.MenuItems.Add(OpenGUI);
        contextmenu.MenuItems.Add(Advancedmodewindow);
        contextmenu.MenuItems.Add("-");
        contextmenu.MenuItems.Add(quitappitem);
        icontask.ContextMenu = contextmenu;

        icontask.Icon = iconone_active;
        icontask.Visible = true;
    }

    private void Advancedmodewindow_click(object sender, EventArgs e)
    {
        classx.AllocConsole();
        Console.WriteLine("X");
        classx.FreeConsole();
    }

    private void OpenGUI_click(object sender, EventArgs e)
    {
        this.ShowInTaskbar = true;
        this.WindowState = FormWindowState.Normal;  
    }

    private void quitappitem_click(object sender, EventArgs e)
    {
        Threadworkermy.Abort();
        icontask.Dispose();
        this.Close();
    }

    public void checkActivityThread()
    {
        try
        {
            while(true)
            {
                Thread.Sleep(100);   
            }
        } catch(ThreadAbortException tbe)
        {

        }

    }

    private void button1_Click(object sender, EventArgs e)
    {
        this.WindowState = FormWindowState.Minimized;
        this.ShowInTaskbar = false;
    }


}

}

在 mscorlib.dll 中抛出“System.IO.IOException”的异常 附加信息：句柄无效。

对于那些说要改变类型的人，我不能。 （需要是WFA申请）

Answer 1

销毁控制台窗口似乎存在问题，因此您可以将其隐藏。

要隐藏窗口，您需要一个来自 user32.dll 的额外 DllImport 并将 GetConsoleWindow 的返回值更改为 IntPtr：

[DllImport("user32.dll")]
public static extern bool ShowWindow(IntPtr hWnd, int nCmdShow);

[DllImport("kernel32.dll")]
public static extern IntPtr GetConsoleWindow();

现在检查控制台句柄是否已经存在。如果确实显示控制台，则创建控制台窗口：

private void Advancedmodewindow_click(object sender, EventArgs e)
{
    IntPtr handle = classx.GetConsoleWindow();
    if (handle == IntPtr.Zero)
    {
        classx.AllocConsole();
        handle = classx.GetConsoleWindow();
    }
    else
    {
        //shows the window with the given handle
        classx.ShowWindow(handle, 8);
    }
    Console.WriteLine("X");
    //hides the window with the given handle
    classx.ShowWindow(handle, 0);
}

---

原始解决方案可以在这里找到：

https://social.msdn.microsoft.com/Forums/vstudio/en-US/cdee5d88-3325-47ce-9f6b-83aa4447f8ca/console-exception-on-windows-8?forum=clr