如何获得在WPF与台式机鼠标的位置？ [英] How to get mouse position related to desktop in WPF?

问题描述

当您搜索使用这样的问题，谷歌，你得到了很多次，但所有的解决方案假定您有至少一个窗口。

When you search for such question using google you get a lot of hits but all solutions assume you have at least one window.

但我的问题是，就像我的话来说 - 没有假设的。我可以有一个窗口，但我可以有零窗口（因为我没有甚至显示一个或我刚刚关闭了最后一个）。因此，在短期的解决方案，可以不依赖任何部件或窗口 - 唯一的事情是已知的，是有一个桌面（和应用程序运行，但它不具有任何窗口）

But my question is just like I phrased it -- not assumptions at all. I can have a window, but I could have zero windows (because I didn't even show one or I just closed the last one). So in short the solution cannot rely on any widget or window -- the only thing is known, is there is a desktop (and app running, but it does not have any windows).

所以，问题是 - ？如何让鼠标位置

So the question is -- how to get the mouse position?

我想展示中心，以鼠标位置的窗口。有一个在WPF没有这样的模式（只有中心，为业主，或中心屏幕），所以我不得不做手工。缺少的部分是鼠标的位置。

I would like to show windows centered to mouse position. There is no such mode in WPF (there are only center to owner, or center to screen) so I have to do it manually. The missing piece is mouse position.

感谢大家，所以我现在的第一部分该解决方案 - 原始位置。现在有一个问题，如何将数据转换为WPF。我发现了这样的话题：
http://stackoverflow.com/questions/1189384/wpf -pixels到桌面像素
但同样，它假定有一些窗口。

Thank you all, so now I have the first part of the solution -- raw position. Now there is a problem how to convert the data for WPF. I found such topic: http://stackoverflow.com/questions/1189384/wpf-pixels-to-desktop-pixels but again, it assumes having some window.

然后我GOOGLE了更多，我找到解决办法：
的 http://jerryclin.wordpress.com/2007/11/13/creating-non-rectangular-windows-with-interop/

Then I googled more and I found solution: http://jerryclin.wordpress.com/2007/11/13/creating-non-rectangular-windows-with-interop/

中的代码包括类放大/缩小坐标只依靠有关桌面信息。因此，这两条的作品，我终于得到解决:-)。再次感谢

the code includes class for scaling up/down coordinates relying only on info about desktop. So joining those two pieces, I finally get the solution :-). Thanks again.

推荐答案

获取屏幕坐标：

[DllImport("user32.dll")]
[return: MarshalAs(UnmanagedType.Bool)]
static extern bool GetCursorPos(out POINT lpPoint);

[StructLayout(LayoutKind.Sequential)]
public struct POINT
{
    public int X;
    public int Y;

    public POINT(int x, int y)
    {
        this.X = x;
        this.Y = y;
    }
}

private void WritePoint(object sender, RoutedEventArgs e)
{
    POINT p;
    if (GetCursorPos(out p))
    {
        System.Console.WriteLine(Convert.ToString(p.X) + ";" + Convert.ToString(p.Y));
    }
}

转换像素WPF单位：

Converting Pixels to WPF Units:

[DllImport("User32.dll")]
static extern IntPtr GetDC(IntPtr hwnd);

[DllImport("gdi32.dll")]
static extern int GetDeviceCaps(IntPtr hdc, int nIndex);

[DllImport("user32.dll")]
static extern bool ReleaseDC(IntPtr hWnd, IntPtr hDC);

private Point ConvertPixelsToUnits(int x, int y)
{
    // get the system DPI
    IntPtr dDC = GetDC(IntPtr.Zero); // Get desktop DC
    int dpi = GetDeviceCaps(dDC, 88);
    bool rv = ReleaseDC(IntPtr.Zero, dDC);

    // WPF's physical unit size is calculated by taking the 
    // "Device-Independant Unit Size" (always 1/96)
    // and scaling it by the system DPI
    double physicalUnitSize = (1d / 96d) * (double)dpi;
    Point wpfUnits = new Point(physicalUnitSize * (double)x,
        physicalUnitSize * (double)y);

    return wpfUnits;          
}

把两者一起：

Putting both together:

private void WriteMouseCoordinatesInWPFUnits()
{
    POINT p;
    if (GetCursorPos(out p))
    {
        Point wpfPoint = ConvertPixelsToUnits(p.X, p.Y);
        System.Console.WriteLine(Convert.ToString(wpfPoint.X) + ";" + Convert.ToString(wpfPoint.Y));
    }
}

这篇关于如何获得在WPF与台式机鼠标的位置？的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！