Question

我在c＃应用程序中使用flashwindowex winapi来刷新图标托盘中的IE窗口。当我在代码中添加断点并在debug中运行时，代码运行正常。但是当删除断点时，相同的代码不起作用。

这是一个控制台应用程序，我使用几个windows api来查找其名称创建的IE进程的句柄。进程句柄进一步传递给FlashWindowEX WINAPI以闪烁进程。

public static System.IntPtr hnd = IntPtr.Zero;
public delegate bool CallBackPtr(IntPtr hwnd, int lParam);
public static CallBackPtr callBackPtr;
public const UInt32 FLASH_T = 3;
public const UInt32 FLASH_S = 12;

static void Main(string[] args)
{
    try
    {
        OrigCode();
    }
    catch (Exception ex)
    {
        Console.WriteLine(ex.Message);
    }
    Console.ReadLine();
}

public static void OrigCode()
{
    string strPzszPath = string.Empty;
    string strCommandLine = string.Empty;
    string strpath1 = "http://localhost/Till/Default.aspx";

    strPzszPath = string.Concat(strPzszPath, strpath1);
    strPzszPath = string.Concat(strPzszPath, "?TSCashierID=JILL&TSBalPeriod=2&TSBalDate=2015-06-02");
    strCommandLine = strPzszPath;
    Process procRequested = new Process();

    ////Create the process in minimised mode by default
    procRequested.StartInfo.WindowStyle = ProcessWindowStyle.Minimized;
    procRequested.StartInfo.UseShellExecute = false;

    ////Get the file name in which process is required to be started
    procRequested.StartInfo.FileName = @"C:\Program Files\Internet Explorer\IExplore.exe";

    procRequested.StartInfo.Arguments = strCommandLine;

    ////Start the process, process should be created in minimised mode
    procRequested.Start();

    callBackPtr = new CallBackPtr(SetFocusEnum);
    int intResult = EnumWindows(callBackPtr, 0);

    FLASHWINFO fi = new FLASHWINFO();
    fi.cbSize = Convert.ToUInt32(Marshal.SizeOf(fi));
    fi.hwnd = hnd;
    fi.dwFlags = FLASH_T | FLASH_S;
    fi.ucount = UInt32.MaxValue;
    fi.dwTimeout = 0;
    FlashWindowEx(ref fi);
}

private static bool SetFocusEnum(IntPtr hWnd, int intLParam)
{
    int intSize = GetWindowTextLength(hWnd);
    try
    {

        if (intLParam == 0) //Process created so check by name
        {
            if (intSize++ > 0)
            {

                //Capture the running window name
                StringBuilder sbWindowName = new StringBuilder(intSize);
                GetWindowText(hWnd, sbWindowName, intSize);
                //Capture the running process with the window name
                if (sbWindowName.ToString().Contains("My Web Application Title"))
                {
                //Capture the handle which will be used to set the focus
                hnd = hWnd;
                }
            }
        }
    }
    catch (Exception ex)
    {
    }
    finally
    {
    }
    return true;
}

以下是我使用的winapi功能：

[DllImport("user32.dll", CharSet = CharSet.Unicode)]
internal static extern int EnumWindows(CallBackPtr callPtr, int intProc);

[DllImport("user32.dll", CharSet = CharSet.Unicode)]
internal static extern int GetWindowTextLength(IntPtr intptrHwnd);

[DllImport("user32.dll", CharSet = CharSet.Unicode)]
internal static extern int GetWindowText(IntPtr intptrHwnd, StringBuilder strText, int intMaxCount);

[DllImport("user32.dll")]
[return: MarshalAs(UnmanagedType.Bool)]
private static extern bool FlashWindowEx(ref FLASHWINFO pwfi);

[StructLayout(LayoutKind.Sequential)]
private struct FLASHWINFO
{
    public UInt32 cbSize;
    public IntPtr hwnd;
    public UInt32 dwFlags;
    public UInt32 ucount;
    public UInt32 dwTimeout;
}

Answer 1

就像我在评论中所说的那样，这里的问题是，在执行EnumWindows()功能时，加载页面以便更改窗口的文本需要很长时间。你使用的代码几乎是立即执行的，而打开过程并加载页面需要几百毫秒到几秒钟。添加延迟是最简单的解决方法，可以解决您的问题。

这就是我的所作所为：

procRequested.Start();
procRequested.WaitForInputIdle();

System.Threading.Thread.Sleep(750); //Wait for approximately 750 ms.

通常建议不要使用Thread.Sleep()，但由于您使用的是控制台应用程序，除了阻止用户输入时，它并没有太大的区别。

您可能还注意到我添加了对Process.WaitForInputIdle()的调用，这是为了让您的应用程序等到该进程完成其启动过程（例如，加载资源，或Windows之前的任何进程）应用程序实际开始），以便我们知道什么时候我们可以期望窗口实际显示。

如果您觉得或经历有时750毫秒的延迟是不够的，请尝试将其提升至1250或类似的东西。

修改

由于（正如你所说）一个聚焦窗口不会闪现，你可以将一个窗口句柄存储到先前聚焦的窗口，并在你放开FlashWindowEx代码之前使用它来再次聚焦窗口执行。

为此，您需要两个WinAPI调用：

[DllImport("user32.dll")] private static extern IntPtr GetForegroundWindow(); [DllImport("user32.dll")] [return: MarshalAs(UnmanagedType.Bool)] static extern bool SetForegroundWindow(IntPtr hWnd);

GetForegroundWindow()获取当前焦点窗口的窗口句柄。

SetForegroundWindow()通过指定窗口句柄来设置当前关注的窗口。

然后你在这里使用这两个函数：

IntPtr focusedhWnd = GetForegroundWindow(); //Get the window handle to the currently focused window. procRequested.Start(); procRequested.WaitForInputIdle(); System.Threading.Thread.Sleep(750); //Wait for approximately 750 ms. callBackPtr = new CallBackPtr(SetFocusEnum); int intResult = EnumWindows(callBackPtr, 0); SetForegroundWindow(focusedhWnd); //Focus the previously focused window again. FLASHWINFO fi = new FLASHWINFO(); fi.cbSize = Convert.ToUInt32(Marshal.SizeOf(fi)); fi.hwnd = hnd; fi.dwFlags = FLASH_T | FLASH_S; fi.ucount = UInt32.MaxValue; fi.dwTimeout = 0; FlashWindowEx(ref fi);

闪烁一个窗口

1 个答案: