关于Win32窗口怎么获取鼠标在窗口中的位置？

[kaoshi100ha]

大一新生假期实习。。

case WM_LBUTTONDOWN:
	{
		pt.x=LOWORD(lParam);
		pt.y=HIWORD(lParam);
        }

可是LOWORD下面一直有波浪线啊。。。说未定义标识符lParam。。。求救。。看了几个小时还是弄不出来

[qq_35578084]

你的函数参数名不对啊。 肯定是...WndProc(...LPARAM lParam)...啊

[schlafenhamster]

case WM_LBUTTONDOWN: 应该在 LRESULT CALLBACK MainWndProc(HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam) 中

[jena_wy]

这个是未定义，说明你的函数的参数不是这个变量，要根据你的函数传相应的变量

[赵4老师]

百度搜“WM_LBUTTONDOWN”

[qq_33352615]

先GetCursorPos,得到在屏幕中的坐标，然后再用ScreenToClient转换一下就好

[hurryboylqs]

大一就有实习机会，不错

[三岁、就很帅]

pt.x=LOWORD(lParam); pt.y=HIWORD(lParam); 你这2个xy是什么类型的就强制转换成什么类型的啊 pt.x=double(wParam); pt.y=double(lParam);

[Eleven]

WM_LBUTTONDOWN fwKeys = wParam; xPos = LOWORD(lParam); yPos = HIWORD(lParam); 你检查了一下你的窗口过程函数是怎么写的？

[tianxian_1019]

pt.x = LOWORD(lParam); pt.y = HIWORD(lParam);

[schlafenhamster]

    case WM_RBUTTONDOWN: 
    case WM_LBUTTONDOWN: 
        //  When we get a mouse down message, we know that the mouse 
        //  is over the control.  We then do the following steps 
        //  to set up the new state: 
        //   1.  Hit-test the coordinates of the click to 
        //       determine in which half the click occurred. 
        //   2.  Set the appropriate SPINNERSTATE_*CLICK state 
        //       and repaint that clicked half.  This is another 
        //       example of a change-state-and-repaint strategy. 
        //   3.  Send an initial scroll message. 
        //   4.  Set the mouse capture. 
        //   5.  Set the initial delay timer before repeating 
        //       the scroll message. 
 
//      if (uRightBt) break; 
        uRightBt = message; 
//  Get the mouse coordinates. 
        x = (int) LOWORD(lParam); 
        y = (int) HIWORD(lParam); 
//  Only need to hit-test the upper half Then change-state-and-repaint 
        GetClientRect (hArrow, &rect); 
        cy = rect.bottom >> 1; // /2
// 
        if (y > cy) 
        { 
            StateSet(dwSpinnerState, SPINNERSTATE_DOWNCLICK); 
            rect.top = cy; 
            wScroll = SB_LINEDOWN; 
        } 
        else 
        { 
            StateSet(dwSpinnerState, SPINNERSTATE_UPCLICK); 
            rect.bottom = cy + 1; 
            wScroll = SB_LINEUP; 
        } 
 //
        SetWindowLong (hArrow, GWL_SPINNERSTATE, (LONG) dwSpinnerState); 
 
        InvalidateRect (hArrow, &rect, TRUE); 
        UpdateWindow (hArrow); 
 
        SetCapture (hArrow); 
 
        //  Process SHIFT key state along with button message 
 
        if (wParam & MK_SHIFT) 
        { 
            if (message != WM_RBUTTONDOWN) 
                wScroll += (WORD) (SB_TOP - SB_LINEUP); 
            else 
                wScroll += (WORD) (SB_THUMBPOSITION - SB_LINEUP); 
        } 
        else 
        { 
            if (message == WM_RBUTTONDOWN) 
                wScroll += SB_PAGEUP - SB_LINEUP; 
 
            bArrowTimed = SetTimer (hArrow, SB_tmID,//GetWindowLong (hArrow, GWL_ID), 
                                             200, (TIMERPROC) ArrowTimerProc); 
        }
// send WM_VSCROLL to parent ?
//nScrollCode = (int) LOWORD(wParam); // scroll bar value 
//nPos = (short int) HIWORD(wParam);  // scroll box position 
//hwndScrollBar = (HWND) lParam;      // handle to scroll bar 
        SendMessage (hArrow, WM_VSCROLL, MAKELONG(wScroll,GetWindowLong (hArrow, GWL_ID)),
			                              (LONG) hArrow); 
        break; 

[听弦断｜醉花烟]