c# - 获取屏幕边缘和网页之间的距离

Question

好的，考虑这张图片。

I develop an IE extension in c# and I would :
  - the distance in red, between top of screen and top of `visible webpage`
  - the distance in red between left of screen and left of `visible webpage`
  - the width/heigth of the visible webpage

当然考虑到我有整个屏幕尺寸。如果我有红色和黑色，我可以计算出绿色。

有什么意义？

我有千个屏幕坐标(X，Y)，我必须计算相对于网页的坐标。

Example : 

Considering
  Screen size : 1200 * 800
  Webpage size : 400*300
  Red distance between left screen border and left webpage border  : 200
  Red distance between top screen border and top webpage border  : 300

So my coordinates screen => relative webpage becomes :
  ( 100, 100 ) => OUTSIDE WEBPAGE( ignored )
  ( 1100, 650 ) => OUTSIDE WEBPAGE ( ignored )
  ( 200, 300 ) => ( 0,0 )
  ( 250, 400 ) => ( 50, 100 )

实际上我有这段代码，this继承自AddinExpress.IE.ADXIEModule，thetoolbarObj是我添加到InternetExplorer的工具栏。所以我可以在上面使用 pointToScreen，我离我需要的不远，但是工具栏的左上角不是我需要的，我需要网页的左上角。

public void getUtilsDimension()
{
    Rectangle resolution = Screen.PrimaryScreen.Bounds;
    Int32 screenWidth = resolution.Width;
    Int32 screenHeight = resolution.Height;

    AddinExpress.IE.ADXIEToolBarItem toolbarItem = this.ToolBars[0];
    AddinExpress.IE.ADXIEToolbar toolbarObj = toolbarItem.ToolBarObj;
    Point leftCornerWebPage = toolbarObj.PointToScreen(new Point(0, 0));
    Int32 toolbarHeight = toolbarObj.Height;
    Int32 toolbarWidth = toolbarObj.Width;

    Debug.WriteLine("Largeur écran : " + screenWidth);
    Debug.WriteLine("Hauteur écran : " + screenHeight);
    Debug.WriteLine("LeftCornerX : " + leftCornerWebPage.X);
    Debug.WriteLine("LeftCornerY : " + leftCornerWebPage.Y);
    Debug.WriteLine("toolbarHeight : " + toolbarHeight);
    Debug.WriteLine("toolbarWidth : " + toolbarWidth);

}

这是我实际得到的，屏幕是 1600*900，po​​intToScreen 返回红叉的坐标( 484,158 )。但是我需要蓝色十字的坐标，作为可见网页的宽度和高度。我知道我可以在 Jquery 中使用 $(window) 获得它，但我不知道如何使用 C#。

我可以使用 this.HTMLDocument 访问 HTLMDocument(typeof mshtml.HTMLDocument)，不幸的是 pointToScreen 在 HTMLDocument 对象上不可用。

编辑:第一个屏幕截图上是 chrome，但当然应该是 IE

08/12 更新

好的，我有可见网页的宽度和高度(屏幕截图上的黑线)唯一缺少的是我截图2上蓝色十字的坐标

var heightVisibleWebPage = HTMLDocument.documentElement.offsetHeight;
var widthVisibleWebPage = HTMLDocument.documentElement.offsetWidth;

为了赏金，我需要蓝十字的精确坐标。不管怎样。无论 Internet Explorer 版本、收藏夹/工具/命令/状态栏是否显示，它都应该工作。

更新 08/12 HTMLDocument

HTMLDocument 来自 AddinExpress，它不是 System.Windows.Forms.HtmlDocument

public mshtml.HTMLDocument HTMLDocument
{
    get
    {
        return (this.HTMLDocumentObj as mshtml.HTMLDocument);
    }

}

他的父 HTMLDocument.parentWindows 是一个 IHTMLWindow2对象

HTMLDocumentObj 是

的成员

public class ADXIEModule : Component, IRemoteModule2, IRemoteModule, IObjectWithSite, IWin32Window
{
     ...
    //
    // Résumé :
    //     Gets the automation object (a COM object) of the active document, if any.
    //
    // Notes :
    //     When the active document is an HTML page, this property provides access to
    //     the contents of the HTML Document Object Model (DOM). Specifically, it returns
    //     an HTMLDocument object reference. The HTMLDocument object is functionally
    //     equivalent to the HTML document object used in HTML page script. It supports
    //     all the properties and methods necessary to access the entire contents of
    //     the active HTML document.
    //     The HTMLDocument object can be used through the IHTMLDocument interface,
    //     the IHTMLDocument2 interface, and the IHTMLDocument3 interface.
    //     When other document types are active, such as a Microsoft Word document,
    //     this property returns the document automation object of that document. For
    //     Word documents, this is the Document object.
    [Browsable(false)]
    public object HTMLDocumentObj { get; }

    ...

请为社区解释什么时候为 -1 ;)

Answer 1

这些是步骤:

1. 使用 EnumWindows() api 查找 Internet Explorer 窗口句柄。类名是IEFrame

2. 使用 EnumChildWindows() api 遍历所有子窗口。类名为 Internet Explorer_Server

3. 使用 GetWindowRect() api 查找 x, y 坐标

代码:

[DllImport("user32.dll")]
public static extern int EnumWindows(EnumWindowsCallback lpEnumFunc, int lParam);

[DllImport("user32.dll")]
public static extern int EnumChildWindows(IntPtr hWndParent, EnumWindowsCallback lpEnumFunc, int lParam);

public delegate bool EnumWindowsCallback(IntPtr hwnd, int lParam);

[DllImport("user32.dll")]
public static extern void GetClassName(IntPtr hwnd, StringBuilder s, int nMaxCount);

[StructLayout(LayoutKind.Sequential)]
public struct RECT
{
    public int Left;        // x position of upper-left corner
    public int Top;         // y position of upper-left corner
    public int Right;       // x position of lower-right corner
    public int Bottom;      // y position of lower-right corner
}

[DllImport("user32.dll")]
static extern bool GetWindowRect(IntPtr hwnd, out RECT lpRect);

private IntPtr ieHandle, ieChildHandle;

private void GetWindows()
{
    EnumWindows(Callback, 0);
}

private bool Callback(IntPtr hwnd, int lParam)
{
    StringBuilder className = new StringBuilder(256);

    GetClassName(hwnd, className, className.Capacity);

    if (className.ToString().Equals("IEFrame"))
    {
        ieHandle = hwnd;

        return false;
    }

    return true; //continue enumeration
}

private void GetChildWindows()
{
    if (ieHandle != IntPtr.Zero)
    {
        EnumChildWindows(ieHandle, CallbackChild, 0);
    }
}

private bool CallbackChild(IntPtr hwnd, int lParam)
{
    StringBuilder className = new StringBuilder(256);

    GetClassName(hwnd, className, className.Capacity);

    if (className.ToString().Equals("Internet Explorer_Server"))
    {
        ieChildHandle = hwnd;

        return false;
    }

    return true; //continue enumeration
}

获取坐标:

GetWindows();
GetChildWindows();

if (ieChildHandle != IntPtr.Zero)
{
    RECT rect;

    if (GetWindowRect(ieChildHandle, out rect))
    {
        //rect.Left, rect.Top
    }

}

ieChildHandle = IntPtr.Zero;
ieHandle = IntPtr.Zero;

已使用 IE 6、9 和 11 进行测试