〓〓◆怎么把鼠标限制在一个范围里？◆〓〓马上给分！！！

[anjy]

怎么把鼠标限制在一个范围里？比如，在一个对话框的应用程序里，吧鼠标限制在该窗口内。请具体点！

[webber84]

ClipCursor()

[anjy]

范围怎么设？

[masterz]

Confining a Cursor
The following example confines the cursor to the application's window and then restores the cursor to its previous window. The example uses the GetClipCursor function to record the area in which the cursor can move and the ClipCursor function to confine and restore the cursor.

RECT rcClip; // new area for ClipCursor
RECT rcOldClip; // previous area for ClipCursor

// Record the area in which the cursor can move.

GetClipCursor(&rcOldClip);

// Get the dimensions of the application's window.

GetWindowRect(hwnd, &rcClip);

// Confine the cursor to the application's window.

ClipCursor(&rcClip);

//
// Process input from the confined cursor.
//

// Restore the cursor to its previous area.

ClipCursor(&rcOldClip);
Because there is only one cursor at a time available in the system, an application that confines the cursor must restore the cursor before relinquishing control to another window.

[anjy]

hwnd是什么，如何得到？

[webber84]

masterz() 说的是SDK的方法。如果你用MFC的话，直接用CWnd*调用函数就是了。

[vc8]

RECT rc;
RECT oldRc;
GetClipCursor( &oldRc );
GetWindowRect( &rc );
ClipCursor( &rc );
....
//退出
ClipCursor( &oldRc );

[linning6]

找本参考书看看嘛。

[dou_ya]

BOOL C***Dlg::StartClipCusor()
{
RECT rc;
GetWindowRect( &rc );

return ClipCursor( &rc );
}

BOOL C***Dlg::EndClipCursor()
{
return ClipCursor(NULL);
}

[dou_ya]

ClipCursor 是 Win32 API，MFC 没有进行封装。

ClipCursor
The ClipCursor function confines the cursor to a rectangular area on the screen. If a subsequent cursor position (set by the SetCursorPos function or the mouse) lies outside the rectangle, the system automatically adjusts the position to keep the cursor inside the rectangular area.

BOOL ClipCursor(
CONST RECT *lpRect // screen coordinates
);
Parameters
lpRect
[in] Pointer to the RECT structure that contains the screen coordinates of the upper-left and lower-right corners of the confining rectangle. If this parameter is NULL, the cursor is free to move anywhere on the screen.
Return Values
If the function succeeds, the return value is nonzero.

If the function fails, the return value is zero. To get extended error information, call GetLastError.

Remarks
The cursor is a shared resource. If an application confines the cursor, it must release the cursor by using ClipCursor before relinquishing control to another application.

The calling process must have WINSTA_WRITEATTRIBUTES access to the window station.

[tifaling]

RECT rect;
rect.top=0;rect.botton=640;
rect.left=0;rect.right=480;
ClipCursor(&rect);
把鼠标限定在(0,0)~(640,480)

[eastrock]

BOOL ClipCursor(
CONST RECT *lpRect);

[anjy]

TO:dou_ya(豆芽菜)
按你的方法，虽然一开始可以限定鼠标范围，但是，但用鼠标拖动一下改对话框，或新开一个其他任何窗口（如：资源管理器）后，限制范围就不起作用了。

[golq]

补充问一下,如果窗口是园的呢?

我以前作了一个院窗口,没法用clipcursor,只有用mousemove判断,有没有好办法呀

[webber84]

如果你想在系统范围内限制鼠标移动的话，好像只能用HOOK。因为用ClipCusor总能通过alt+tab来切换窗口，只要一切换到别的窗口，ClipCusor就不起作用了。

[anjy]

啊，又是钩子！！不用钩子不行吗？我对钩子实在没把握，好像系统钩子要用DLL，又是一大难点！

[webber84]

关键是看你要在多大程度上限制鼠标。

[anjy]

当然是系统范围内了

[g_windy]

//Start
RECT rc;
GetWindowRect( &rc );
rc.top = rc.top+25;
SetForegroundWindow();
SetCapture();
ClipCursor( &rc );

//End
ReleaseCapture();
ClipCursor(NULL);