10 Windows编程——鼠标消息

和鼠标相关的三个属于：click，double-click，drag

鼠标消息和键盘消息不同：只要鼠标跨越某个窗口，或者在某个窗口中按键，消息。

客户去鼠标消息

WM_MOUSEMOVE

WM_[L,M,R] BUTTONDOWN

WM_[L,M,R] BUTTONUP

WM_[L,M,R] BUTTONDBLCLK

对于这些消息，lParam的低字节为x坐标，高字节为y坐标。
wParam只是鼠标按键以及shift和Ctr1按键的状态（这个和键盘消息相似）。
要测试鼠标按钮是否按下：MK_LBUTTON，MK_MBUTTON，MK_RBUTTON，MK_SHIFT，MK_CONTROL.

非客户区鼠标消息：
WM_NCMOUS EMOVE
WM_NCLBUTTONDOWN.
WM_NCLBUTTONUP
WM_NCLBUTTONDBLCLK

 #include<Windows.h>
 #include<WinUser.h>
 #include<tchar.h>
 #include<stdio.h>

 LRESULT CALLBACK WindProc(HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam);

 int WinMain(HINSTANCE hInst, HINSTANCE tmp, LPSTR szCmd, int nShow)
 {
     WNDCLASS WndClass;
     TCHAR* ClassName = TEXT("MyClass");
     HWND hwnd;
     MSG msg;

     WndClass.cbClsExtra = ;
     WndClass.cbWndExtra = ;
     WndClass.hbrBackground = (HBRUSH)(COLOR_WINDOW + );
     WndClass.hCursor = LoadCursor(NULL, IDC_ARROW);
     WndClass.hIcon = LoadIcon(NULL, IDI_APPLICATION);
     WndClass.hInstance = hInst;
     WndClass.lpfnWndProc = WindProc;
     WndClass.lpszClassName = ClassName;
     WndClass.lpszMenuName = NULL;
     WndClass.style = CS_VREDRAW | CS_HREDRAW;

     RegisterClass(&WndClass);
     hwnd = CreateWindow(ClassName, TEXT("Hello"), WS_OVERLAPPEDWINDOW, CW_USEDEFAULT, CW_USEDEFAULT, , , NULL, NULL, hInst, NULL);
     ShowWindow(hwnd, nShow);
     UpdateWindow(hwnd);

     while (GetMessage(&msg, NULL, , ))
     {
         TranslateMessage(&msg);
         DispatchMessage(&msg);
     }
     return ;
 }

 LRESULT CALLBACK WindProc(HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)
 {
     HDC hdc;
     PAINTSTRUCT pt;
     TCHAR *rectwords = TEXT("我在学习鼠标消息");
     static int i;
     switch (message)
     {
     case WM_CREATE:
         return ;
     case WM_SIZE:
         return ;
     case WM_PAINT:
         hdc = BeginPaint(hwnd, &pt);
         Rectangle(hdc, , , , );
         if (i)
         {
             TextOut(hdc, , , rectwords, _tcslen(rectwords));
         }
         EndPaint(hwnd, &pt);
         return ;
     case WM_CHAR:
         return ;
     case WM_LBUTTONUP:
         i = ;
         InvalidateRect(hwnd, NULL, TRUE);
         return ;
     case WM_LBUTTONDOWN:
         InvalidateRect(hwnd, NULL, TRUE);
         if (LOWORD(lParam)> && LOWORD(lParam)< && HIWORD(lParam)> && HIWORD(lParam)<)
         {
             i = ;
         }
         return ;
     case WM_MOUSEMOVE:
         hdc = GetDC(hwnd);
         if (wParam&MK_LBUTTON)
         {
             SetPixel(hdc, LOWORD(lParam), HIWORD(lParam), );
         }
         ReleaseDC(hwnd, hdc);
         return ;
     case WM_DESTROY:
         PostQuitMessage();
         return ;
     default:
         break;
     }

     return DefWindowProc(hwnd, message, wParam, lParam);
 }