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[英]winform show windows to Foreground replace temporary form dialog
[英]Set to foreground a third party dialog in a Windows Form Application
早上好。
我發瘋了,期待着解決一個非常極端的問題。 希望有人能分享一些經驗。
我正在開發OCR排序軟件; 為了與文檔掃描儀通信,我使用了不錯的NTwain庫。
當掃描儀驅動程序有話要說時(發生錯誤,卡紙,進紙器已空等),它會自動彈出對話框,因此您無法控制它們。
問題是那些消息仍保留在后台,被我的應用程序主窗體隱藏,而我不知道如何將它們放在前台。
使用user32.dll
互操作方法是一種選擇,但是我可以弄清楚引發掃描儀驅動程序對話框的過程; 為用戶提供了不同制造商使用不同模型的可能性,我不能依靠對話框標題或類似名稱,因為它們因模型而異。
有人有主意嗎?
在Windows中,有一個C:\\Windows\\TWAIN.dll
和一個C:\\Windows\\twain_32.dll
,使操作系統可以與掃描儀驅動程序進行通信:使用user32.dll,可以找到從特定窗口打開的窗口。 dll,就像可以處理進程一樣?
我在交叉手指:)
再見南多
我終於找到了解決我的問題的棘手/部分解決方案。
與之前所說的(至少對於佳能掃描儀而言)不同,似乎驅動程序對話框消息框是我主進程窗口的子級 ; 終於有了一些User32.dll互操作性 黑魔法和計時器,我終於將那該死的小窗口移到了前台,讓用戶閱讀並選擇要做什么。
這里的代碼。
#region Usings
using System;
using System.Collections;
#endregion
namespace EProm.Common.PInvoke
{
/// <summary>
/// Catch process child windows, setting them in foreground.
/// <see cref="http://stackoverflow.com/questions/28559726/set-to-foreground-a-third-party-dialog-in-a-windows-form-application"/>
/// </summary>
public class DialogsCatcher
{
#region Fields
private readonly ILog _log;
private readonly int _processId;
private readonly Timer _timer;
private readonly IntPtr _windowHandle;
#endregion
#region Constructors
public DialogsCatcher(int processId, int interval, IntPtr windowHandle)
{
_log = LogManager.GetLogger(GetType().Name);
_processId = processId;
_windowHandle = windowHandle;
_timer = new Timer();
_timer.Elapsed += new ElapsedEventHandler(CatchDialogs);
_timer.Enabled = true;
_timer.Interval = interval;
_log.Debug("DialogsCatcher initialized.");
}
#endregion
#region Public Methods
public void StartMonitoring()
{
_timer.Start();
_log.Debug("DialogsCatcher started.");
}
public void StopMonitoring()
{
_timer.Stop();
_log.Debug("DialogsCatcher stopped.");
}
#endregion
#region Private Methods
private void CatchDialogs(object sender, EventArgs e)
{
GetProcessOpenedWindowsByProcessId(_processId, _windowHandle);
}
//nando20150219: meaningful names, you're doin' it right! :)
private void GetProcessOpenedWindowsByProcessId(int processId, IntPtr windowHandle)
{
var shellWindowHandle = User32.GetShellWindow();
var windows = new Dictionary<IntPtr, string>();
EnumWindowsProc filter = (windowHandle, lp) =>
{
int length = User32.GetWindowTextLength(windowHandle);
var windowText = new StringBuilder(length);
User32.GetWindowText(windowHandle, windowText, length + 1);
windows.Add(windowHandle, windowText.ToString());
var isWindowVisible = User32.IsWindowVisible(windowHandle);
if (windowHandle == shellWindowHandle)
{
return true;
}
if (!isWindowVisible)
{
return true;
}
if (length == 0)
{
return true;
}
uint windowPid;
User32.GetWindowThreadProcessId(windowHandle, out windowPid);
if (windowPid != processId)
{
return true;
}
if (windowHandle != windowHandle)
{
//nando20150218: set window to foreground
User32.SetForegroundWindow(windowHandle);
_log.DebugFormat("Window \"{0}\" moved to foreground.", windowText);
}
return true;
};
User32.EnumWindows(filter, 0);
#if DEBUG
//foreach (var dictWindow in windows)
//{
// _log.DebugFormat("WindowHandle: {0} - WindowTitle: {1}", dictWindow.Key, dictWindow.Value);
//}
#endif
}
#endregion
}
#region Delegates
public delegate bool EnumWindowsProc(IntPtr windowHandle, IntPtr lp);
public delegate bool EnumedWindow(IntPtr windowHandle, ArrayList windsowHandles);
#endregion
/// <summary>
/// Windows User32.dll wrapper
/// </summary>
/// <see cref="http://pinvoke.net/"/>
public class User32
{
#region Public Methods
[DllImport("user32.dll")]
[return: MarshalAs(UnmanagedType.Bool)]
public static extern bool IsWindowVisible(IntPtr hWnd);
[DllImport("user32.dll", EntryPoint = "GetWindowText", ExactSpelling = false, CharSet = CharSet.Auto, SetLastError = true)]
public static extern int GetWindowText(IntPtr hWnd, StringBuilder lpWindowText, int nMaxCount);
[DllImport("user32.dll", SetLastError = true)]
public static extern uint GetWindowThreadProcessId(IntPtr hwnd, out uint lpdwProcessId);
[DllImport("user32.dll")]
[return: MarshalAs(UnmanagedType.Bool)]
public static extern bool SetForegroundWindow(IntPtr hWnd);
[DllImport("user32.DLL")]
public static extern bool EnumWindows(EnumWindowsProc enumFunc, int lParam);
[DllImport("user32.DLL")]
public static extern int GetWindowTextLength(IntPtr hWnd);
[DllImport("user32.DLL")]
public static extern IntPtr GetShellWindow();
#endregion
}
}
再見風滾草.... :)
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