通過c＃按下Internet Explorer的“文件下載對話框”的保存按鈕

Question

我正在研究Internet Explorer自動化，其中一部分涉及從asp 2.0上托管的站點下載文件並使用基於表單的身份驗證，因此為了創建端到端自動化，我使用了瀏覽器自動化。

我能夠到達我可以點擊一個帶有瀏覽器“文件下載”對話框的URL的步驟，然后我試圖利用SendKeys點擊保存按鈕，但無濟於事不工作

下面是我使用FindWindow方法獲取文件下載對話框的hWnd指針的代碼，然后使用setActiveWindow使其成為活動窗口，以便SendKeys命令對其起作用，然后使用SendKeys我嘗試發送Alt +但它沒有用。 我觀察到，Tab，Escape和Enter工作，但是Enter on Save按鈕不起作用。

[DllImport("user32.dll", SetLastError = true)]
static extern IntPtr FindWindow(string lpClassName, string lpWindowName);

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

[DllImport("user32.dll", SetLastError = true)]
static extern IntPtr SetActiveWindow(IntPtr hWnd);

private void Form1_Load(object sender, EventArgs e)
{
    IntPtr hwnd = FindWindow(null, "File Download");
    IntPtr nullptr = (IntPtr)0;
    if (hwnd != nullptr)
    {
        SetActiveWindow(hwnd);
        SendKeys.SendWait("%S");
    }
}

使用相同的代碼，我可以通過將FindWindow中的值更改為“Untitled - Notepad”來訪問記事本。

我是否需要做一些不同的事情，因為它是一個對話框，現在是一個窗口？ 我正在使用IE8。

這是我在答案后嘗試的備用代碼。

IntPtr hwnd = FindWindow(null, "File Download");
            IntPtr hokBtn = IntPtr.Zero;
            hokBtn = FindWindowEx(hwnd, hokBtn, "Button", IntPtr.Zero);
            hokBtn = FindWindowEx(hwnd, hokBtn, "Button", IntPtr.Zero);
            uint id = GetDlgCtrlID(hokBtn);
            SetActiveWindow(hwnd);
            IntPtr res = SendMessage(hokBtn, (int)0x00F5, 0, IntPtr.Zero);
            if (res.ToInt32() == 1)
                MessageBox.Show("success");

為清楚起見，我正在添加對話框的屏幕。

alt text http://www.freeimagehosting.net/uploads/4f23586401.png

Answer 1

這適用於C ++請注意，“保存”按鈕名為“＆Save”而非“保存”

CString Title;
    Title=_T("File Download");
    HWND FEX =  ::FindWindowEx( NULL,NULL,NULL,Title);
    if (FEX != NULL)
    {

        //press the Save button on the dialog.
        HWND hokBtn = ::FindWindowEx(FEX, NULL, L"Button", L"&Save");
        if (hokBtn != NULL)
        {

            UINT id = ::GetDlgCtrlID(hokBtn);
            ::SetActiveWindow(hokBtn);
            ::PostMessage(hokBtn, WM_KEYDOWN, 0x20, 0);
            ::PostMessage(hokBtn, WM_KEYUP, 0x20, 0);
        }

}

Answer 2

嘗試以下似乎對我有用的：

IntPtr hwnd = FindWindow(null, "File Download");
IntPtr hokBtn = FindWindowEx(hwnd, null, "Button", "Cancel");
uint id = GetDlgCtrlID(hokBtn);
SetActiveWindow(hwnd);
IntPtr res = SendMessage(hokBtn, (int)0x00F5, 0, IntPtr.Zero);
if (res.ToInt32() == 1)
    MessageBox.Show("success");

我建議你檢查每個功能的回報。

Answer 3

我在StackOverflow上找到了大部分內容： 如何在C＃中使用webbrowser時處理消息框？ 我為我修改了它

using System.Runtime.InteropServices; //for the dll import (to press a key)

[DllImport("user32.dll", SetLastError = true)]
static extern IntPtr FindWindowEx(IntPtr hwndParent, IntPtr hwndChildAfter, string lpszClass, string lpszWindow);

[DllImport("user32.dll", EntryPoint = "FindWindow", SetLastError = true)]
private static extern IntPtr FindWindow(string lpClassName, string lpWindowName);

[DllImport("user32.dll", CharSet = CharSet.Auto)]
static extern IntPtr SendMessage(IntPtr hWnd, UInt32 Msg, IntPtr wParam, IntPtr lParam);

private async void downloadstuff()
{
await Task.Delay(40000);  //i need this delay, but you might not :)
{
    IntPtr hwnd = FindWindow("#32770", "File Download");  //this is the window it finds
    hwnd = FindWindowEx(hwnd, IntPtr.Zero, "Button", "&Save");  //this is the button to pres
    uint message = 0xf5;
    SendMessage(hwnd, message, IntPtr.Zero, IntPtr.Zero);
}
await Task.Delay(1000);
{
    IntPtr hwnd2 = FindWindow("#32770", "Save As");
    hwnd2 = FindWindowEx(hwnd2, IntPtr.Zero, "Button", "&Save");
    uint message2 = 0xf5;
    SendMessage(hwnd2, message2, IntPtr.Zero, IntPtr.Zero);
}
await Task.Delay(1000);                //i press it anyway, just in case :)
{   //this is the download complete box (if its checked it doesn't show up)
    IntPtr hwnd3 = FindWindow("#32770", "Download complete");
    hwnd3 = FindWindowEx(hwnd3, IntPtr.Zero, "Button", "Close");
    uint message3 = 0xf5;
    SendMessage(hwnd3, message3, IntPtr.Zero, IntPtr.Zero);
}
}

Answer 4

好吧，你必須找到下載對話框標題的窗口。 而且你必須找到帶有下載按鈕標題的窗口/然后發送到該窗口點擊消息

  BM_CLICK = 0x00F5

  [DllImport("user32.dll", CharSet = CharSet.Auto)]
    public static extern IntPtr FindWindowEx(IntPtr parent, IntPtr next, string sClassName, IntPtr sWindowTitle);

  [DllImport("user32.dll", ExactSpelling = true, CharSet = CharSet.Auto)]
    public static extern uint GetDlgCtrlID(IntPtr hWnd); 

  [DllImport("user32.dll", CharSet = CharSet.Auto)]
    public static extern IntPtr SendMessage(IntPtr hWnd, int msg, int wParam, IntPtr lParam); 

    //hDialog  - handle of dialog window. idBtn - Id of button
     public static bool ClickButtonOnDialog(IntPtr hDialog, UInt32 idBtn)
    {
        IntPtr res = IntPtr.Zero;
        uint id;
        IntPtr hOkBtn = IntPtr.Zero;
        int attempt = 0;
        do
        {
            Thread.Sleep(300);
            //searching for button
            hOkBtn = User32.FindWindowEx(hDialog, hOkBtn, "Button", IntPtr.Zero);
            id = User32.GetDlgCtrlID(hOkBtn);
            attempt++;
        } while (id != idBtn && attempt < 20);
        if (!hOkBtn.Equals(IntPtr.Zero))
        {
            //click the button
            res = User32.SendMessage(hOkBtn, (int)WindowsMessages.BM_CLICK, 1,  IntPtr.Zero);
        }
        if (res.ToInt32() == 1)
            return true;
        return false;
    }

你可以使用winspector（類似spy ++）。 這是非常有用的實用程序。 你可以發現很多關於windows的東西;）

Answer 5

我在Windows XP中找到了使用Internet Explorer 6執行此操作的方法。

（對不起，VBA代碼）

'ButtonHwnd is the pointer to the Save button
Private Declare Function SetCursorPos Lib "user32" (ByVal X As Integer, ByVal Y As Integer) As Long
Private Declare Sub mouse_event Lib "user32.dll" (ByVal dwFlags As Long, ByVal dx As Long, ByVal dy As Long, ByVal cButtons As Long, ByVal dwExtraInfo As Long)
Private Const MOUSEEVENTF_LEFTDOWN As Long = &H2
Private Const MOUSEEVENTF_LEFTUP As Long = &H4
Dim pos As RECT
' We get the button position
GetWindowRect ButtonHwnd, pos

' We simulate an entering of the cursor in the button. IE think this is a human :-).
' We need three steps: out, entering and in.
' Out
SetCursorPos (pos.Left - 10), (pos.Top - 10)
Sleep 100
' Entering
SetCursorPos pos.Left, pos.Top
Sleep 100
' In
SetCursorPos (pos.Left + pos.Right) / 2, (pos.Top + pos.Bottom) / 2

' We do clic with the left button. You can use SendInput instead
' With 400 miliseconds it works.
mouse_event MOUSEEVENTF_LEFTDOWN, (pos.Left + pos.Right) / 2, (pos.Top + pos.Bottom) / 2, 0, 0
Sleep 400
mouse_event MOUSEEVENTF_LEFTUP, (pos.Left + pos.Right) / 2, (pos.Top + pos.Bottom) / 2, 0, 0

請告訴它是否適合你。

Answer 6

IntPtr hwnd = FindWindow(null, "File Download");
IntPtr hokBtn = FindWindowEx(hwnd, null, "Button", "Cancel");
uint id = GetDlgCtrlID(hokBtn);
SetActiveWindow(hwnd);
IntPtr res = SendMessage(hokBtn, (int)0x00F5, 0, IntPtr.Zero);
if (res.ToInt32() == 1)
    MessageBox.Show("success");

如果我沒有錯，那實際上是誤報; 看似故障安全的默認行為似乎是關閉對話框。 相反，可以單擊取消按鈕是積極的，但是嘗試單擊打開或保存將在該上下文中生成相同的不需要的響應...

看來這是一個我們只需要處理的對話框，除非別人可以感激地另外確認一下？

Answer 7

沒有任何代碼建議工作，我最終使用AutoIt腳本關閉打印對話框，代碼如下：

Local $hWnd = WinWait("[CLASS:#32770]", "Print", 20)
WinActivate($hWnd)
WinWaitActive("[CLASS:#32770]", "Print", 10)
Sleep(100)
Send("{ENTER}")