A freshman summer internships,,

 case WM_LBUTTONDOWN: 
{
Pt. X=LOWORD (lParam); 
Pt. Y=HIWORD (lParam); 
} 

But under the LOWORD have wavy lines,,, say undefined identifiers lParam,,, for help, and don't look for a few hours

CodePudding user response:

This is undefined, the parameters of the function is not this variable, you according to you the function of the corresponding variable

CodePudding user response:

Baidu search "WM_LBUTTONDOWN"

CodePudding user response:

Your function parameter name is not correct,
It must be... WndProc (... LPARAM LPARAM)... ah

CodePudding user response:

Case WM_LBUTTONDOWN:
Should be in the
LRESULT a CALLBACK MainWndProc (HWND HWND, UINT message, WPARAM WPARAM, LPARAM LPARAM)
In the

CodePudding user response:

GetCursorPos first, to get the coordinates of the screen, and then using ScreenToClient change my good

CodePudding user response:

Freshmen have internships, good

CodePudding user response:

Pt. X=LOWORD (lParam);
Pt. Y=HIWORD (lParam); You this 2 xy is what kind of forced into what types of
Pt. X=double (wParam);
Pt. Y=double (lParam);

CodePudding user response:

WM_LBUTTONDOWN fwKeys=wParam;
XPos=LOWORD (lParam);
YPos=HIWORD (lParam);

Did you check your window procedure function is how to write?

CodePudding user response:

Pt. X=LOWORD (lParam);
Pt. Y=HIWORD (lParam);

CodePudding user response:

 
Case WM_RBUTTONDOWN: 
Case WM_LBUTTONDOWN: 
//the When we get a mouse down the 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, & amp; The rect); 
Cy=the rect. Bottom & gt;> 1;///2 
//
If (y & gt; Cy) 
{
StateSet (dwSpinnerState SPINNERSTATE_DOWNCLICK); 
The rect. Top=cy; 
WScroll=SB_LINEDOWN; 
} 
The else 
{
StateSet (dwSpinnerState SPINNERSTATE_UPCLICK); 
The rect. Bottom=cy + 1; 
WScroll=SB_LINEUP; 
} 
//
HArrow, SetWindowLong (GWL_SPINNERSTATE, (LONG) dwSpinnerState); 

HArrow, InvalidateRect (& amp; The rect, TRUE); 
UpdateWindow (hArrow); 

SetCapture (hArrow); 

//Process the SHIFT key state along with the button message 

If (wParam & amp; MK_SHIFT) 
{
If (the message!=WM_RBUTTONDOWN) 
WScroll +=(WORD) (SB_TOP - SB_LINEUP); 
The else 
WScroll +=(WORD) (SB_THUMBPOSITION - SB_LINEUP); 
} 
The else 
{
If (message==WM_RBUTTONDOWN) 
WScroll +=SB_PAGEUP - SB_LINEUP; 

HArrow, bArrowTimed=SetTimer (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 the scroll bar 
HArrow, SendMessage (WM_VSCROLL MAKELONG (wScroll, GetWindowLong (hArrow, GWL_ID)), 
HArrow) (LONG); 
break; 

CodePudding user response: