我正在尝试将多个游标更改为Cross cursor.这是我正在使用的代码：
[DllImport("user32.dll")]
static extern bool SetSystemCursor(IntPtr hcur,uint id);
[DllImport("user32.dll")]
static extern IntPtr LoadCursor(IntPtr hInstance,int lpCursorName);
[DllImport("user32.dll",CharSet = CharSet.Auto)]
private static extern Int32 SystemParametersInfo(UInt32 uiAction,UInt32 uiParam,String pvParam,UInt32 fWinIni);
//Normal cursor
private static uint OCR_NORMAL = 32512;
//The text selection (I-beam) cursor.
private static uint OCR_IBEAM = 32513;
//The cross-shaped cursor.
private static uint OCR_CROSS = 32515;
然后我使用我做的这两个函数：
static public void ChangeCursors() {
SetSystemCursor(LoadCursor(IntPtr.Zero,(int)OCR_CROSS),OCR_NORMAL);
SetSystemCursor(LoadCursor(IntPtr.Zero,OCR_IBEAM);
}
static public void RevertCursors() {
SystemParametersInfo(0x0057,null,0);
}
如果我只使用SetSystemCursor(LoadCursor(IntPtr.Zero,OCR_NORMAL);,一切正常. Normal游标被Cross游标替换.
我的问题是当我尝试将多个游标更改为Cross游标时.如果我调用ChangeCursors(),预期的结果将是Normal游标和I-beam游标被Cross游标替换.但结果真是奇怪.
当程序启动时根据光标的当前状态启动软件时,会发生以下奇怪的事情：
>如果软件启动时光标为“正常”,则它将变为“交叉”(这很好).此外,I-beam被Normal替换(这很糟糕,它应该是Cross).
>如果在软件启动时光标是工字梁,它会保持工字梁(这很糟糕,因为它应该是十字形).然后,通过将光标悬停到之前光标应该是Normal的位置,它现在是Cross(这很好).然后,如果我在1秒前将鼠标悬停在光标所在的位置,它会神奇地变为正常(这很奇怪)并保持这种状态.
所以,我的问题是,如何使用SetSystemCursor()将2个或更多游标更改为交叉游标？
解决方法
不要对这种奇怪的行为感到困惑.每次分配时,只是游标被交换.
首先
Normal == Normal IBeam == IBeam Cross == Cross
您指定正常=交叉
Normal == Cross IBeam == IBeam Cross == Normal
现在分配IBeam = Cross(现在是正常的)
Normal == Cross IBeam == Normal Cross == IBeam
因此,为了不让它被交换,你必须保留所有游标的副本.我将举例说明Normal和IBeam改为CROSS.
Program.cs中
static class Program
{
[DllImport("user32.dll")]
static extern bool SetSystemCursor(IntPtr hcur,uint id);
[DllImport("user32.dll")]
static extern IntPtr LoadCursor(IntPtr hInstance,int lpCursorName);
[DllImport("user32.dll",CharSet = CharSet.Auto)]
private static extern Int32 SystemParametersInfo(UInt32 uiAction,UInt32
uiParam,UInt32 fWinIni);
[DllImport("user32.dll")]
public static extern IntPtr CopyIcon(IntPtr pcur);
private static uint CROSS = 32515;
private static uint NORMAL = 32512;
private static uint IBEAM = 32513;
[STAThread]
static void Main()
{
Application.EnableVisualStyles();
Application.SetCompatibleTextRenderingDefault(false);
uint[] Cursors = {NORMAL,IBEAM};
for (int i = 0; i < Cursors.Length; i++)
SetSystemCursor(CopyIcon(LoadCursor(IntPtr.Zero,(int)CROSS)),Cursors[i]);
Application.Run(new Form1());
SystemParametersInfo(0x0057,0);
}
}