C++当点击鼠标左键时,得到点击位置处的坐标
意思是:如何判断鼠标左键被点击了,如果被点击了 就取得鼠标当前位置的坐标

不是在MFC中,是win32编程.

请教各位,有会的请指教小弟一二.

[解决办法]
WM_LBUTTONDOWN消息里面的lparam参数
win32的消息都可以在msdn上面查
[解决办法]

C/C++ code

/*-----------------------------------------   BLOKOUT1.C -- Mouse Button Demo Program                 (c) Charles Petzold, 1998  -----------------------------------------*/#include <windows.h>LRESULT CALLBACK WndProc (HWND, UINT, WPARAM, LPARAM) ;int WINAPI WinMain (HINSTANCE hInstance, HINSTANCE hPrevInstance,                    PSTR szCmdLine, int iCmdShow){     static TCHAR szAppName[] = TEXT ("BlokOut1") ;     HWND         hwnd ;     MSG          msg ;     WNDCLASS     wndclass ;          wndclass.style         = CS_HREDRAW | CS_VREDRAW ;     wndclass.lpfnWndProc   = WndProc ;     wndclass.cbClsExtra    = 0 ;     wndclass.cbWndExtra    = 0 ;     wndclass.hInstance     = hInstance ;     wndclass.hIcon         = LoadIcon (NULL, IDI_APPLICATION) ;     wndclass.hCursor       = LoadCursor (NULL, IDC_ARROW) ;     wndclass.hbrBackground = (HBRUSH) GetStockObject (WHITE_BRUSH) ;     wndclass.lpszMenuName  = NULL ;     wndclass.lpszClassName = szAppName ;               if (!RegisterClass (&wndclass))     {          MessageBox (NULL, TEXT ("Program requires Windows NT!"),                       szAppName, MB_ICONERROR) ;          return 0 ;     }          hwnd = CreateWindow (szAppName, TEXT ("Mouse Button Demo"),                          WS_OVERLAPPEDWINDOW,                          CW_USEDEFAULT, CW_USEDEFAULT,                          CW_USEDEFAULT, CW_USEDEFAULT,                          NULL, NULL, hInstance, NULL) ;          ShowWindow (hwnd, iCmdShow) ;     UpdateWindow (hwnd) ;          while (GetMessage (&msg, NULL, 0, 0))     {          TranslateMessage (&msg) ;          DispatchMessage (&msg) ;     }     return msg.wParam ;}void DrawBoxOutline (HWND hwnd, POINT ptBeg, POINT ptEnd){     HDC hdc ;          hdc = GetDC (hwnd) ;          SetROP2 (hdc, R2_NOT) ;     SelectObject (hdc, GetStockObject (NULL_BRUSH)) ;     Rectangle (hdc, ptBeg.x, ptBeg.y, ptEnd.x, ptEnd.y) ;          ReleaseDC (hwnd, hdc) ;}LRESULT CALLBACK WndProc (HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam){     static BOOL  fBlocking, fValidBox ;     static POINT ptBeg, ptEnd, ptBoxBeg, ptBoxEnd ;     HDC          hdc ;     PAINTSTRUCT  ps ;          switch (message)     {     case WM_LBUTTONDOWN :          ptBeg.x = ptEnd.x = LOWORD (lParam) ;          ptBeg.y = ptEnd.y = HIWORD (lParam) ;                    DrawBoxOutline (hwnd, ptBeg, ptEnd) ;                    SetCursor (LoadCursor (NULL, IDC_CROSS)) ;                    fBlocking = TRUE ;          return 0 ;               case WM_MOUSEMOVE :          if (fBlocking)          {               SetCursor (LoadCursor (NULL, IDC_CROSS)) ;                              DrawBoxOutline (hwnd, ptBeg, ptEnd) ;                              ptEnd.x = LOWORD (lParam) ;               ptEnd.y = HIWORD (lParam) ;                              DrawBoxOutline (hwnd, ptBeg, ptEnd) ;          }          return 0 ;               case WM_LBUTTONUP :          if (fBlocking)          {               DrawBoxOutline (hwnd, ptBeg, ptEnd) ;                              ptBoxBeg   = ptBeg ;               ptBoxEnd.x = LOWORD (lParam) ;               ptBoxEnd.y = HIWORD (lParam) ;                              SetCursor (LoadCursor (NULL, IDC_ARROW)) ;                              fBlocking = FALSE ;               fValidBox  = TRUE ;                              InvalidateRect (hwnd, NULL, TRUE) ;          }          return 0 ;               case WM_CHAR :          if (fBlocking & (wParam == '\x1B'))     // i.e., Escape          {               DrawBoxOutline (hwnd, ptBeg, ptEnd) ;                              SetCursor (LoadCursor (NULL, IDC_ARROW)) ;                              fBlocking = FALSE ;          }          return 0 ;               case WM_PAINT :          hdc = BeginPaint (hwnd, &ps) ;                    if (fValidBox)          {               SelectObject (hdc, GetStockObject (BLACK_BRUSH)) ;               Rectangle (hdc, ptBoxBeg.x, ptBoxBeg.y,                    ptBoxEnd.x, ptBoxEnd.y) ;          }                    if (fBlocking)          {               SetROP2 (hdc, R2_NOT) ;               SelectObject (hdc, GetStockObject (NULL_BRUSH)) ;               Rectangle (hdc, ptBeg.x, ptBeg.y, ptEnd.x, ptEnd.y) ;          }                    EndPaint (hwnd, &ps) ;          return 0 ;               case WM_DESTROY :          PostQuitMessage (0) ;          return 0 ;     }     return DefWindowProc (hwnd, message, wParam, lParam) ;}