制作 MSN、QQ 的消息提示窗口
作者：袁怀善
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用过QQ和MSN聊天工具的人都知道，只要好友上线，就会在托盘的位置处显示一个提示窗口，
可以是拉帘式的，或者是淡入淡出的形式出现；想想何不为自己的程式也加一个漂亮的提示窗口呢:)
说做就做。
一、MSN拉帘式窗口制作
分三部分：1、窗口的显示；2、窗口的停留；3、窗口的消失；
如果达到这样郊果，系统中要有三个定时器，进行分别控制。定义的定时器如下：
#define ID_TIMER_POP_WINDOW 1#define ID_TIMER_DISPALY_DELAY 2 #define ID_TIMER_CLOSE_WINDOW 3
从CWnd 继承一个窗口,当然也可以从CFrameWnd进行派生,这不是主要问题，关键是看你是怎么处理WM_PAINT,WM_MOUSEMOVE,WM_TIMER的消息。一般情况，我从OnPaint()中进行显示图片，在WM_TIMER中处理定时器消息，下面是处里定时器时用到的代码：
CMsgWnd::CMsgWnd(){ ...SetTimer(ID_TIEMR_POP_WINDOW,20,NULL);...} void CMsgWnd::OnTimer(UINT nIDEvent) { static int nHeight=0;int cy=GetSystemMetrics(SM_CYSCREEN);int cx=GetSystemMetrics(SM_CXSCREEN);RECT rect;SystemParametersInfo(SPI_GETWORKAREA,0,&rect,0);int y=rect.bottom-rect.top;int x=rect.right-rect.left;x=x-WIN_WIDTH;switch(nIDEvent){case ID_TIMER_POP_WINDOW:if(nHeight<=WIN_HEIGHT){++nHeight; MoveWindow(x,y-nHeight,WIN_WIDTH,WIN_HEIGHT);Invalidate(FALSE);}else{KillTimer(ID_TIMER_POP_WINDOW);SetTimer(ID_TIMER_DISPLAY_DELAY,5000,NULL);}break;case ID_TIMER_CLOSE_WINDOW:if(nHeight=0){nHeight--;MoveWindow(x,y-nHeight,WIN_WIDTH,nHeight);}else{KillTimer(ID_TIMER_CLOSE_WINDOW);SendMessage(WM_CLOSE);}break;case ID_TIMER_DISPLAY_DELAY:KillTimer(ID_TIMER_DISPLAY_DELAY);SetTimer(ID_TIMER_CLOSE_WINDOW,20,NULL);break;}CWnd::OnTimer(nIDEvent);} 根据你设的定时器的长短来控制窗口的显示过程；二、QQ淡出淡出显示实现
其实用到一个API函数：AnimateWindow,下面是这个函数的一些说明：
The AnimateWindow function enables you to produce special effects when showing or hiding windows.There are two types of animation: roll animation and slide animation.
BOOL AnimateWindow( HWND hwnd, // handle to the window to animate DWORD dwTime, // duration of animation DWORD dwFlags // animation type );上面的函数前两个参数一看就明白，不用说了，最后一个参数dwFlags设置动画窗口的样式：
Specifies the type of animation. This parameter can be one or more of the following flags.
各种标志说明：
标志 说明 AW_SLIDE Uses slide animation. By default, roll animation is used.This flag is ignored when used with the AW_CENTER flag. AW_ACTIVATE Activates the window. Do not use this flag with AW_HIDE. AW_BLEND Uses a fade effect. This flag can be used only if hwnd is a top-level window.AW_HIDE Hides the window. By default, the window is shown. AW_CENTER Makes the window appear to collapse inward if the AW_HIDE flag is used or expand outward
if the AW_HIDE flag is not used. AW_HOR_POSITIVE Animate the window from left to right. This flag
