# [Windows编程-处理鼠标事件](https://www.cnblogs.com/bruce81/archive/2013/02/12/2910394.html) 我们这里仅讨论两个简单的消息: WM_MOUSEMOVE和WM_*BUTTON*。 **Parameters:** ***wParam*** Indicates whether various virtual keys are down. This parameter can be one or more of the following values. | Value | | Meaning | | ----------- | ------ | -------------------------------- | | MK_CONTROL | 0x0008 | The CTRL key is down. | | MK_LBUTTON | 0x0001 | The left mouse button is down. | | MK_MBUTTON | 0x0010 | The middle mouse button is down. | | MK_RBUTTON | 0x0002 | The right mouse button is down. | | MK_SHIFT | 0x0004 | The SHIFT key is down. | | MK_XBUTTON1 | 0x0020 | The first X button is down. | | MK_XBUTTON2 | 0x0040 | The second X button is down. | ***lParam*** The low-order word specifies the x-coordinate of the cursor. The coordinate is relative to the upper-left corner of the client area. The high-order word specifies the y-coordinate of the cursor. The coordinate is relative to the upper-left corner of the client area. ##### *Return value* If an application processes this message, it should return zero. 下面的代码给出的是鼠标的x,y位置和左右键状态的例子。 ![img](https://images.cnblogs.com/OutliningIndicators/ExpandedBlockStart.gif) [![复制代码](https://common.cnblogs.com/images/copycode.gif)](javascript:void(0);) ``` // INCLUDES /////////////////////////////////////////////// #define WIN32_LEAN_AND_MEAN // just say no to MFC #include // include all the windows headers #include // include useful macros #include // very important and include WINMM.LIB too! #include #include #include // DEFINES //////////////////////////////////////////////// // defines for windows #define WINDOW_CLASS_NAME "WINCLASS1" // GLOBALS //////////////////////////////////////////////// HWND main_window_handle = NULL; // globally track main window HINSTANCE hinstance_app = NULL; // globally track hinstance // FUNCTIONS ////////////////////////////////////////////// LRESULT CALLBACK WindowProc(HWND hwnd, UINT msg, WPARAM wparam, LPARAM lparam) { // this is the main message handler of the system PAINTSTRUCT ps; // used in WM_PAINT HDC hdc; // handle to a device context char buffer[80]; // used to print strings // what is the message switch(msg) { case WM_CREATE: { // do initialization stuff here // return success return(0); } break; case WM_MOUSEMOVE: { // get the position of the mouse int mouse_x = (int)LOWORD(lparam); int mouse_y = (int)HIWORD(lparam); // get the button state int buttons = (int)wparam; // get a graphics context hdc = GetDC(hwnd); // set the foreground color to green SetTextColor(hdc, RGB(0,255,0)); // set the background color to black SetBkColor(hdc, RGB(0,0,0)); // set the transparency mode to OPAQUE SetBkMode(hdc, OPAQUE); // print the ascii code and key state sprintf(buffer,"Mouse (X,Y) = (%d,%d) ",mouse_x,mouse_y); TextOut(hdc, 0,0, buffer, strlen(buffer)); sprintf(buffer,"Right Button = %d ",((buttons & MK_RBUTTON) ? 1 : 0)); TextOut(hdc, 0,16, buffer, strlen(buffer)); sprintf(buffer,"Left Button = %d ",((buttons & MK_LBUTTON) ? 1 : 0)); TextOut(hdc, 0,32, buffer, strlen(buffer)); // release the dc back ReleaseDC(hwnd, hdc); } break; case WM_PAINT: { // simply validate the window hdc = BeginPaint(hwnd,&ps); // end painting EndPaint(hwnd,&ps); // return success return(0); } break; case WM_DESTROY: { // kill the application, this sends a WM_QUIT message PostQuitMessage(0); // return success return(0); } break; default:break; } // end switch // process any messages that we didn't take care of return (DefWindowProc(hwnd, msg, wparam, lparam)); } // end WinProc // WINMAIN //////////////////////////////////////////////// int WINAPI WinMain( HINSTANCE hinstance, HINSTANCE hprevinstance, LPSTR lpcmdline, int ncmdshow) { WNDCLASSEX winclass; // this will hold the class we create HWND hwnd; // generic window handle MSG msg; // generic message // first fill in the window class stucture winclass.cbSize = sizeof(WNDCLASSEX); winclass.style = CS_DBLCLKS | CS_OWNDC | CS_HREDRAW | CS_VREDRAW; winclass.lpfnWndProc = WindowProc; winclass.cbClsExtra = 0; winclass.cbWndExtra = 0; winclass.hInstance = hinstance; winclass.hIcon = LoadIcon(NULL, IDI_APPLICATION); winclass.hCursor = LoadCursor(NULL, IDC_ARROW); winclass.hbrBackground = (HBRUSH)GetStockObject(BLACK_BRUSH); winclass.lpszMenuName = NULL; winclass.lpszClassName = WINDOW_CLASS_NAME; winclass.hIconSm = LoadIcon(NULL, IDI_APPLICATION); // save hinstance in global hinstance_app = hinstance; // register the window class if (!RegisterClassEx(&winclass)) return(0); // create the window if (!(hwnd = CreateWindowEx(NULL, // extended style WINDOW_CLASS_NAME, // class "Mouse Tracking Demo", // title WS_OVERLAPPEDWINDOW | WS_VISIBLE, 0,0, // initial x,y 400,300, // initial width, height NULL, // handle to parent NULL, // handle to menu hinstance,// instance of this application NULL))) // extra creation parms return(0); // save main window handle main_window_handle = hwnd; // enter main event loop, but this time we use PeekMessage() // instead of GetMessage() to retrieve messages while(TRUE) { // test if there is a message in queue, if so get it if (PeekMessage(&msg,NULL,0,0,PM_REMOVE)) { // test if this is a quit if (msg.message == WM_QUIT) break; // translate any accelerator keys TranslateMessage(&msg); // send the message to the window proc DispatchMessage(&msg); } // end if // main game processing goes here // Game_Main(); // or whatever your loop is called } // end while // return to Windows like this return(msg.wParam); } // end WinMain /////////////////////////////////////////////////////////// ``` [![复制代码](https://common.cnblogs.com/images/copycode.gif)](javascript:void(0);) 如果我们想测试left button的双击事件，可以加入下面的代码： ``` case WM_LBUTTONDBLCLK: { // do something for you return(0); }break; ```