表格外的滑鼠游标 [英] Mouse cursor outside of form

问题描述

我有一个用c ++编写的旧颜色选择器实用程序，几年前我编写了该代码，并希望使用c#进行重写.

I have an old color picker utility written c++ that I coded years back and want to rewrite using c#.

我实现了全局挂钩以从屏幕上拾取像素，依此类推.一切都很好，但是...

I implemented the global hook to pick pixels off the screen and so on. Everything is ok but...

一旦鼠标移到表格外并移至桌面，十字光标就会恢复为指针.对于我的c ++代码(实际上是MFC)，这不会发生.

The cross cursor reverts to the pointer once the mouse moves outside the form and onto the desktop. This does not happen with my c++ code (MFC actually).

这是如何在c#中完成的?

How is this accomplished in c#?

谢谢大家.

(我正在使用此 http://www.codeproject.com/Articles/7294/Processing-Global-Mouse-and-Keyboard-Hooks-in-C 作为挂钩)

(I'm using this http://www.codeproject.com/Articles/7294/Processing-Global-Mouse-and-Keyboard-Hooks-in-C for the hook)

推荐答案

解决方案(或解决方法)是模拟鼠标单击事件的第一部分.这样会将鼠标锁定在调用窗口上，从而保留选定的光标.

The solution (or a workaround) is to simulate the first part of a mouse click event. This will lock the mouse on the calling window, thus preserving the chosen cursor.

[DllImport( "user32.dll", CharSet = CharSet.Auto, CallingConvention = CallingConvention.StdCall )]
public static extern void mouse_event( uint dwFlags, uint dx, uint dy, uint cButtons, uint dwExtraInfo );

private const int   MOUSEEVENTF_LEFTDOWN    = 0x02;
private const int   MOUSEEVENTF_LEFTUP      = 0x04;
private const int   MOUSEEVENTF_RIGHTDOWN   = 0x08;
private const int   MOUSEEVENTF_RIGHTUP     = 0x10;

然后在代码中启用鼠标捕获后:

And then after enabling the mouse capture in the code:

mouse_event(
    MOUSEEVENTF_LEFTDOWN,
    (uint)Cursor.Position.X,
    (uint)Cursor.Position.Y,
    0,
    0 );

this.Cursor = Cursors.Cross;

希望有帮助.

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