通过c＃按下Internet Explorer的“文件下载对话框”的保存按钮

时间：2010-06-08 18:20:58

标签： c# internet-explorer download sendkeys

我正在研究Internet Explorer自动化，其中一部分涉及从asp 2.0上托管的站点下载文件并使用基于表单的身份验证，因此为了创建端到端自动化，我使用了浏览器自动化。

我能够到达可以点击带有浏览器“文件下载”对话框的URL的步骤，然后我尝试使用SendKeys点击保存按钮但是没有利用它没有用。

下面是我使用FindWindow方法获取文件下载对话框的hWnd指针的代码，然后使用setActiveWindow使其成为活动窗口，以便SendKeys命令对其起作用然后使用SendKeys我试图发送Alt + S但它不起作用。我观察到，Tab，Escape和Enter工作正常，但是Enter on Save按钮不起作用。

[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");
    }
}

使用相同的代码，我可以通过将FindWindow中的值更改为“Untitled - Notepad”来访问记事本。

我是否需要做一些不同的事情，因为它是一个对话框，现在是一个窗口？我正在使用IE8。

这是我在答案后尝试的备用代码。

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");

为清楚起见，我正在添加对话框的屏幕。

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

7 个答案:

答案 0 :(得分：2)

这适用于C ++ 请注意，“保存”按钮的名称为“＆amp; 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);
        }

}

答案 1 :(得分：1)

好吧，你必须找到下载对话框标题的窗口。而且你必须找到带有下载按钮标题的窗口/然后发送到该窗口点击消息

  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（类似spy ++）。这是非常有用的实用程序。你可以发现很多关于windows的东西;）

答案 2 :(得分：1)

尝试以下似乎对我有用的内容：

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");

我建议你检查每个功能的回报。

答案 3 :(得分：1)

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

（对不起，VBA代码）

'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

请告诉您是否适合您。

答案 4 :(得分：1)

我在StackOverflow上发现了大部分内容：How to handle Message Boxes while using webbrowser in C#? 我为我修改了它

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);
}
}

答案 5 :(得分：0)

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");

如果我没错，那实际上是误报;看似故障安全的默认行为似乎是关闭对话框。相反，可以单击取消按钮是积极的，但是尝试单击打开或保存将在该上下文中生成相同的不需要的响应......

似乎这是一个我们只需要处理的对话框，除非别人可以感激地另外确认一下？

答案 6 :(得分：0)

没有任何代码建议工作，我最终使用AutoIt脚本关闭打印对话框，代码如下：

synchronized ("1") {
   // ... 
}

synchronized (new Object()) {
   // ...
}
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