如何使用 Watin / IE9 测试文件下载？

Question

我正在尝试使用 Watin 2.1.0 针对 IE9 测试文件下载。我使用问题Downloading a file with Watin in IE9接受的答案中的建议代码，如下所示：

var downloadHandler = new FileDownloadHandler(fname);
WebBrowser.Current.AddDialogHandler(downloadHandler);
link.ClickNoWait();
downloadHandler.WaitUntilFileDownloadDialogIsHandled(15);
downloadHandler.WaitUntilDownloadCompleted(200);

但是，downloadHandler.WaitUntilFileDownloadDialogIsHandled(15) 调用超时。我该怎么办？

Answer 1

文件下载对话框在 IE9 (Windows7) NetFramework 4.0 中不起作用。

以下代码 sn-p 可能会帮助您解决问题：

首先，您必须将引用 UIAutomationClient 和 UIAutomationTypes 添加到您的测试项目中。

在 Ie9 工具 -> 查看下载 -> 选项定义保存文件夹的路径之后。

下一个方法扩展了浏览器类

public static void DownloadIEFile(this Browser browser)
{
    // see information here (http://msdn.microsoft.com/en-us/library/windows/desktop/ms633515(v=vs.85).aspx)
    Window windowMain = new Window(WatiN.Core.Native.Windows.NativeMethods.GetWindow(browser.hWnd, 5));
   System.Windows.Automation.TreeWalker trw = new  System.Windows.Automation.TreeWalker(System.Windows.Automation.Condition.TrueCondition);
   System.Windows.Automation.AutomationElement mainWindow = trw.GetParent(System.Windows.Automation.AutomationElement.FromHandle(browser.hWnd));

    Window windowDialog = new Window(WatiN.Core.Native.Windows.NativeMethods.GetWindow(windowMain.Hwnd, 5));
    // if doesn't work try to increase sleep interval or write your own waitUntill method
    Thread.Sleep(1000);
    windowDialog.SetActivate();
    System.Windows.Automation.AutomationElementCollection amc = System.Windows.Automation.AutomationElement.FromHandle(windowDialog.Hwnd).FindAll(System.Windows.Automation.TreeScope.Children, System.Windows.Automation.Condition.TrueCondition);

    foreach (System.Windows.Automation.AutomationElement element in amc)
    {
        // You can use "Save ", "Open", ''Cancel', or "Close" to find necessary button Or write your own enum
        if (element.Current.Name.Equals("Save"))
        {
            // if doesn't work try to increase sleep interval or write your own waitUntil method
            // WaitUntilButtonExsist(element,100);
            Thread.Sleep(1000);
            System.Windows.Automation.AutomationPattern[] pats = element.GetSupportedPatterns();
            // replace this foreach if you need 'Save as' with code bellow
            foreach (System.Windows.Automation.AutomationPattern pat in pats)
            {
                // '10000' button click event id 
                if (pat.Id == 10000)
                {
                    System.Windows.Automation.InvokePattern click = (System.Windows.Automation.InvokePattern)element.GetCurrentPattern(pat);
                    click.Invoke();
                }
            }
        }
    }
}

如果你想点击“另存为”，用这个替换 foreach 代码

System.Windows.Automation.AutomationElementCollection bmc =  element.FindAll(System.Windows.Automation.TreeScope.Children,   System.Windows.Automation.Automation.ControlViewCondition);
System.Windows.Automation.InvokePattern click1 =  (System.Windows.Automation.InvokePattern)bmc[0].GetCurrentPattern(System.Windows.Automation.AutomationPattern.LookupById(10000));
click1.Invoke();
Thread.Sleep(10000);

System.Windows.Automation.AutomationElementCollection main =  mainWindow.FindAll(System.Windows.Automation.TreeScope.Children
,System.Windows.Automation.Condition.TrueCondition);
foreach (System.Windows.Automation.AutomationElement el in main)
{
    if (el.Current.LocalizedControlType == "menu")
    {
        // first array element 'Save', second array element 'Save as', third second array element    'Save and open'
        System.Windows.Automation.InvokePattern clickMenu = (System.Windows.Automation.InvokePattern)
                    el.FindAll(System.Windows.Automation.TreeScope.Children,        System.Windows.Automation.Condition.TrueCondition)  [1].GetCurrentPattern(System.Windows.Automation.AutomationPattern.LookupById(10000));
                       clickMenu.Invoke();
        //add ControlSaveDialog(mainWindow, filename) here if needed
        break;

    }
}

编辑： 此外，如果您需要自动保存指定路径并单击保存的对话框，您可以通过在中断之前添加此代码来实现；

private static void ControlSaveDialog(System.Windows.Automation.AutomationElement mainWindow, string path)
{
    //obtain the save as dialog
    var saveAsDialog = mainWindow
                        .FindFirst(TreeScope.Descendants,
                                   new PropertyCondition(AutomationElement.NameProperty, "Save As"));
    //get the file name box
    var saveAsText = saveAsDialog
            .FindFirst(TreeScope.Descendants,
                       new AndCondition(
                           new PropertyCondition(AutomationElement.NameProperty, "File name:"),
                           new PropertyCondition(AutomationElement.ControlTypeProperty, ControlType.Edit)))
            .GetCurrentPattern(ValuePattern.Pattern) as ValuePattern;
    //fill the filename box 
    saveAsText.SetValue(path);

    Thread.Sleep(1000);
    //find the save button
    var saveButton =
            saveAsDialog.FindFirst(TreeScope.Descendants,
            new AndCondition(
                new PropertyCondition(AutomationElement.NameProperty, "Save"),
                new PropertyCondition(AutomationElement.ControlTypeProperty, ControlType.Button)));
    //invoke the button
    var pattern = saveButton.GetCurrentPattern(InvokePattern.Pattern) as InvokePattern;
    pattern.Invoke();
}

Answer 2

IE9 不再使用对话窗口来保存文件。相反，它使用通知栏来防止焦点从网站上移开。请参阅“下载管理器”下的http://msdn.microsoft.com/en-us/ie/ff959805.aspx 以供参考。

不幸的是，这意味着 WatiN 中当前的 FileDownloadHandler 将无法工作。它为每个浏览器实例实例化一个“DialogWatcher”类，该类是任何类型的子窗口的基本消息泵。当遇到子窗口时，DialogWatcher 会检查该窗口是否专门是一个对话框（通知栏不是）。如果它是一个对话框，它会遍历已注册的 IDialogHandler 实例，调用“CanHandleDialog”。即使通知栏是一个对话框，它也是不同的窗口样式（http://msdn.microsoft.com/en-us/library/windows/desktop/ms632600(v=vs.85).aspx），这就是 WatiN 检测对话框类型的方式。

据我所知，目前尚不支持检测 IE 9 通知栏及其在 WatiN 中的提示。在添加该支持之前，您将无法在 IE9 中自动下载文件。