有哪位大蝦知道SPY++是用什麼方法在WINDOW上畫方框的?

[mate]

我自已試用GetWindowDC和GetWindowRect來在窗口上畫框，然后call Invalidate()來讓窗口自已复原。但此法對于子窗口還可以，對于主窗口郤一點都畫不出來。而spy++沒有此問題。而且它取消方框不知是用的什麼方法，我查過，它并沒有發出WM_PAINT消息。
另外，有誰知道SPY++用什麼方法得到的MOUSE 下的WINDOW指針(不是用WindowFromPoint())

[In355Hz]

哦，它使用SetROP2将框的色彩设为屏幕背景的反色（R2_NOT）
画出的框只要按原来的大小重画一次就可以消除
CDC.SetROP2(R2_NOT)
CDC.DrawRect(&rect); //画框
CDC.SetROP2(R2_NOT);
CDC.DrawRect(&rect); //消除

[In355Hz]

对于第二个问题，这是MSDN上的原话：
The WindowFromPoint function does not retrieve a handle to a hidden or disabled window, even if the point is within the window. An application should use the ChildWindowFromPoint function for a nonrestrictive search.

可以用ChildWindowFromPoint进行完全搜索。

[wang1st]

使用DrawDragRect能自己擦掉以前画的边框


CDC::DrawDragRect
void DrawDragRect( LPCRECT lpRect, SIZE size, LPCRECT lpRectLast, SIZE sizeLast, CBrush* pBrush = NULL, CBrush* pBrushLast = NULL );

Remarks

Call this member function repeatedly to redraw a drag rectangle. Call it in a loop as you sample mouse position, in order to give visual feedback. When you call DrawDragRect, the previous rectangle is erased and a new one is drawn. For example, as the user drags a rectangle across the screen, DrawDragRect will erase the original rectangle and redraw a new one in its new position. By default, DrawDragRect draws the rectangle by using a halftone brush to eliminate flicker and to create the appearance of a smoothly moving rectangle.

The first time you call DrawDragRect, the lpRectLast parameter should be NULL.

[In355Hz]

要用GetWindowDC()取得hdc，这样的hdc才能在非客户区做图

[mate]

To In355Hz,Wanglst:
我遇到的主要問題是無法在窗口的邊框上畫rect。雖然我取得窗口的rect和dc，但是在標題欄和窗口邊框上面不能畫上任何東西。而spy是在窗口的外框上畫rect。

[随风bj]

看看我写的一个小工具aimtarget (csdn上有),是不是那个意思?

[随风bj]

代码如下:
void SKDemo_DrawWindowFrame (HWND hwndSubject)
{
HDC hdc;
RECT rc;
HPEN hpen;
GetWindowRect(hwndSubject, &rc); //得到窗口的尺寸
hdc = GetWindowDC(hwndSubject); //从句柄得到dc
SaveDC(hdc); //储存dc
SetROP2(hdc, R2_NOT); //设置hdc为做R2_NOT（反）运算模式
//------------------------------------------------创建画笔并选入dc中
hpen = CreatePen(PS_INSIDEFRAME, 3 * GetSystemMetrics(SM_CXBORDER),
RGB(0, 0, 0));
SelectObject(hdc, hpen);
SelectObject(hdc, GetStockObject(NULL_BRUSH));
//------------------------------------------------
Rectangle(hdc, 0, 0, rc.right - rc.left, rc.bottom - rc.top); //画一个矩形
RestoreDC(hdc, -1); //恢复dc
ReleaseDC(hwndSubject, hdc); //释放hdc
DeleteObject(hpen); //释放hpen
}