Question

我正在开发一个使用WebBrowser控件的Web Bot项目。

我的目标是以可编程方式在加载的WebBrowser中的所需元素上打开webBrowsers ContextMenu，并从ContextMenu中选择一个选项。

示例：

在WebBrowser控件中导航到Google。打开ContextMenu。选择＆＃34;显示图片＆＃34;

到目前为止，这是我设法找到Here的最近代码：

foreach (MenuItem vMenuItem in WebBrowser.ContextMenu.MenuItems)
{
    if (vMenuItem.Text.Contains("onwert") && vMenuItem.Text.Contains("PDF"))
    {
        vMenuItem.PerformClick();
    }
}

此代码到目前为止在第一行返回错误，这里有Any解决方案吗？

工作替代方案：

到目前为止，我已经设法通过模拟点击来实现这一点，这个问题是当隐藏窗口时会出现明显的错误。此外，我宁愿没有光标跳过屏幕。如果有一种方法来模拟隐藏窗口上的点击，它可能是一个解决方案。这是我当前模拟点击的代码:(虽然我不想使用模拟点击，但此代码有效）

        Point controlLoc = this.PointToScreen(webbrowser1.Location);
        controlLoc.X = controlLoc.X + webbrowser1.Document.GetElementById("sbvdcapimg").OffsetRectangle.Left+65;
        controlLoc.Y = controlLoc.Y + webbrowser1.Document.GetElementById("sbvdcapimg").OffsetRectangle.Top+50;
        Cursor.Position = controlLoc;
        MouseSimulator.ClickRightMouseButton();
        controlLoc.X = controlLoc.X + (webbrowser1.Document.GetElementById("sbvdcapimg").OffsetRectangle.Left + 95);
        controlLoc.Y = controlLoc.Y + (webbrowser1.Document.GetElementById("sbvdcapimg").OffsetRectangle.Top + 45);
        Cursor.Position = controlLoc;
        MouseSimulator.ClickLeftMouseButton();

public class MouseSimulator
{
    [DllImport("user32.dll", SetLastError = true)]
    static extern uint SendInput(uint nInputs, ref INPUT pInputs, int cbSize);

    [StructLayout(LayoutKind.Sequential)]
    struct INPUT
    {
        public SendInputEventType type;
        public MouseKeybdhardwareInputUnion mkhi;
    }
    [StructLayout(LayoutKind.Explicit)]
    struct MouseKeybdhardwareInputUnion
    {
        [FieldOffset(0)]
        public MouseInputData mi;

        [FieldOffset(0)]
        public KEYBDINPUT ki;

        [FieldOffset(0)]
        public HARDWAREINPUT hi;
    }
    [StructLayout(LayoutKind.Sequential)]
    struct KEYBDINPUT
    {
        public ushort wVk;
        public ushort wScan;
        public uint dwFlags;
        public uint time;
        public IntPtr dwExtraInfo;
    }
    [StructLayout(LayoutKind.Sequential)]
    struct HARDWAREINPUT
    {
        public int uMsg;
        public short wParamL;
        public short wParamH;
    }
    struct MouseInputData
    {
        public int dx;
        public int dy;
        public uint mouseData;
        public MouseEventFlags dwFlags;
        public uint time;
        public IntPtr dwExtraInfo;
    }
    [Flags]
    enum MouseEventFlags : uint
    {
        MOUSEEVENTF_MOVE = 0x0001,
        MOUSEEVENTF_LEFTDOWN = 0x0002,
        MOUSEEVENTF_LEFTUP = 0x0004,
        MOUSEEVENTF_RIGHTDOWN = 0x0008,
        MOUSEEVENTF_RIGHTUP = 0x0010,
        MOUSEEVENTF_MIDDLEDOWN = 0x0020,
        MOUSEEVENTF_MIDDLEUP = 0x0040,
        MOUSEEVENTF_XDOWN = 0x0080,
        MOUSEEVENTF_XUP = 0x0100,
        MOUSEEVENTF_WHEEL = 0x0800,
        MOUSEEVENTF_VIRTUALDESK = 0x4000,
        MOUSEEVENTF_ABSOLUTE = 0x8000
    }
    enum SendInputEventType : int
    {
        InputMouse,
        InputKeyboard,
        InputHardware
    }

    public static void ClickRightMouseButton()
    {
        INPUT mouseDownInput = new INPUT();
        mouseDownInput.type = SendInputEventType.InputMouse;
        mouseDownInput.mkhi.mi.dwFlags = MouseEventFlags.MOUSEEVENTF_RIGHTDOWN;
        SendInput(1, ref mouseDownInput, Marshal.SizeOf(new INPUT()));

        INPUT mouseUpInput = new INPUT();
        mouseUpInput.type = SendInputEventType.InputMouse;
        mouseUpInput.mkhi.mi.dwFlags = MouseEventFlags.MOUSEEVENTF_RIGHTUP;
        SendInput(1, ref mouseUpInput, Marshal.SizeOf(new INPUT()));
    }

    public static void ClickLeftMouseButton()
    {

        INPUT mouseDownInput = new INPUT();
        mouseDownInput.type = SendInputEventType.InputMouse;
        mouseDownInput.mkhi.mi.dwFlags = MouseEventFlags.MOUSEEVENTF_LEFTDOWN;
        SendInput(1, ref mouseDownInput, Marshal.SizeOf(new INPUT()));

        INPUT mouseUpInput = new INPUT();
        mouseUpInput.type = SendInputEventType.InputMouse;
        mouseUpInput.mkhi.mi.dwFlags = MouseEventFlags.MOUSEEVENTF_LEFTUP;
        SendInput(1, ref mouseUpInput, Marshal.SizeOf(new INPUT()));
    }

如果有办法通过调用WebBrowsers ContextMenu来执行此过程...？！

凹凸。

Answer 1

这取决于您的具体要求。如果要操作特定的HTML元素，可以通过DOM访问它。 IMO，你可以做WebBrowser可以做的所有事情。

如果要使用上下文菜单（以避免编写额外代码或假装用户操作），可以在所需位置发送鼠标单击，然后暂时阻止上下文菜单弹出窗口。以下是Delphi中的示例代码供您参考。

function TTrident.ShowContextMenu(const dwID: DWORD; const ppt: PPOINT; const pcmdtReserved: IUnknown;
  const pdispReserved: IDispatch): HRESULT;
begin
  if FDontShowContextMenuThisTime then
  begin
    FDontShowContextMenuThisTime := False;
    Exit(S_OK);
  end
  else
    Exit(S_FALSE);
end;

ShowContextMenu是接口IDocHostUIHandler的一种方法。换句话说，您必须通过至少实现IDocHostUIHandler来扩展WebBrowser控件。 See also MSDN.

调用Webbrowser ContextMenu

工作替代方案：

1 个答案: