使用WIN32 SDK捕获鼠标事件：离开与滞留

http://dev.rdxx.com/VC/2001-11/14/041027975.shtml
WIN32 SDK - 捕获鼠标离开和滞留等事件
http://www.rdxx.com 01年11月14日 12:12 Blog
文章难易程度：初级

首先要了解 TrackMouseEvent  函数；

此函数当鼠标指针离开或在特定时间内盘旋（滞留）在窗体时投递消息。参数指向 TRACKMOUSEEVENT 结构体。(详细定义及解释请查阅MSDN文档)

typedef struct tagTRACKMOUSEEVENT {  DWORD cbSize;         //TRACKMOUSEEVENT size.  DWORD dwFlags;        //Specifies the services requested.  HWND  hWndtrack;      //Specifies a handle to the window to track.  DWORD dwHovertime;    //hover time-out.} TRACKMOUSEEVENT, *LPTRACKMOUSEEVENT;以下是原码：(注意要在属性页中链接器的导入库中加入 comctl32.lib )//FileName: MouseLevel.c#include <windows.h>#include <commctrl.h>          //必须导入此头文件#ifndef APP_NAME#define APP_NAME TEXT("My MouseHover test")#endifconst int SUCCEED =0;ATOM RegisterFormClass(HINSTANCE);BOOL InitInstance(HINSTANCE,int);LRESULT CALLBACK WndProc(HWND,UINT,WPARAM,LPARAM);int APIENTRY WinMain(HINSTANCE hInstance,            HINSTANCE hPrevInstance,            LPSTR lpCmdLine,          int iCmdShow){ MSG msg;               RegisterFormClass(hInstance); if(!InitInstance(hInstance,iCmdShow))  return FALSE;  while(GetMessage(&msg,NULL,0,0)) {  TranslateMessage(&msg);  DispatchMessage(&msg); }  return SUCCEED;}ATOM RegisterFormClass(HINSTANCE hInstance){ WNDCLASSEX wcex;  wcex.cbSize = sizeof(WNDCLASSEX); wcex.cbClsExtra = 0; wcex.cbWndExtra = 0; wcex.hbrBackground = (HBRUSH) GetStockObject(WHITE_BRUSH); wcex.hCursor = LoadCursor(NULL,IDC_ARROW); wcex.hIcon = LoadIcon(hInstance,IDI_APPLICATION);  wcex.hIconSm = LoadIcon(NULL,IDI_APPLICATION); wcex.hInstance = hInstance; wcex.lpfnWndProc = WndProc; wcex.lpszClassName = APP_NAME; wcex.lpszMenuName = NULL; wcex.style = CS_HREDRAW | CS_VREDRAW;  return RegisterClassEx(&wcex);}BOOL InitInstance(HINSTANCE hInstance,int iCmdShow){ HWND hWnd;  hWnd = CreateWindowEx(WS_EX_APPWINDOW,  APP_NAME,  APP_NAME,  WS_OVERLAPPEDWINDOW,  CW_USEDEFAULT,  CW_USEDEFAULT,  CW_USEDEFAULT,  CW_USEDEFAULT,  NULL,  NULL,  hInstance,  NULL); if (!hWnd)  return FALSE;  ShowWindow(hWnd,iCmdShow); UpdateWindow(hWnd);   return TRUE;}LRESULT CALLBACK WndProc(HWND hWnd,UINT uMsg,WPARAM wParam,LPARAM lParam){ switch(uMsg) { case WM_MOUSELEAVE:  MessageBox(hWnd,TEXT("MouseLeave!"),TEXT("MouseLeave"),0);  break; case WM_MOUSEHOVER:  MessageBox(hWnd,TEXT("MouseHover"),TEXT("MouseHover"),0);  break; case WM_NCMOUSELEAVE:  MessageBox(hWnd,TEXT("MouseNClient!"),TEXT("MouseNClient!"),0);  break; case WM_MOUSEMOVE:          //因为 TRACKMOUSEEVENT 只发送一次消息，且随着其它消息产生而失效，所以在此消息中调用函数。  TRACKMOUSEEVENT trmouse;
 

  trmouse.cbSize = sizeof(TRACKMOUSEEVENT);
  trmouse.dwFlags = TME_LEAVE | TME_HOVER | TME_NONCLIENT;
  trmouse.dwHoverTime = 2000;
  trmouse.hwndTrack = hWnd;
  
  if(!_TrackMouseEvent(&trmouse)) 
   return FALSE;
  
  break;
  
 case WM_DESTROY:
  PostQuitMessage(0);
  break;
 default:
  return DefWindowProc(hWnd,uMsg,wParam,lParam);
  break;
 }
 return SUCCEED;