初学《windows程序设计》,稀里糊涂看到第九章,很多问题不是很清楚,前几天也在这里零碎问了几个问题,还是搞不大清楚,现结合第七章和第九章的两个例子问几个问题,再综合发一个问一下,盼大虾尤其看过这本书的给指点指点啊!!!谢谢谢谢!!!分不够可再加啊!!!
《windows程序设计》书上第七章P274有例子如下:
-----------------------------------
/*-------------------------------------------------
CHECKER3.C -- Mouse Hit-Test Demo Program No. 3
(c) Charles Petzold, 1998
-------------------------------------------------*/#include <windows.h>#define DIVISIONS 5LRESULT CALLBACK WndProc (HWND, UINT, WPARAM, LPARAM) ;
LRESULT CALLBACK ChildWndProc (HWND, UINT, WPARAM, LPARAM) ;TCHAR szChildClass[] = TEXT ("Checker3_Child") ;int WINAPI WinMain (HINSTANCE hInstance, HINSTANCE hPrevInstance,
PSTR szCmdLine, int iCmdShow)
{
static TCHAR szAppName[] = TEXT ("Checker3") ;
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 ;
}
wndclass.lpfnWndProc = ChildWndProc ;
wndclass.cbWndExtra = sizeof (long) ;
wndclass.hIcon = NULL ;
wndclass.lpszClassName = szChildClass ;
RegisterClass (&wndclass) ;
hwnd = CreateWindow (szAppName, TEXT ("Checker3 Mouse Hit-Test 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 ;
}LRESULT CALLBACK WndProc (HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)
{
static HWND hwndChild[DIVISIONS][DIVISIONS] ;
int cxBlock, cyBlock, x, y ;
switch (message)
{
case WM_CREATE :
for (x = 0 ; x < DIVISIONS ; x++)
for (y = 0 ; y < DIVISIONS ; y++)
hwndChild[x][y] = CreateWindow (szChildClass, NULL,
WS_CHILDWINDOW | WS_VISIBLE,
0, 0, 0, 0,
hwnd, (HMENU) (y << 8 | x),
(HINSTANCE) GetWindowLong (hwnd, GWL_HINSTANCE),
NULL) ;
return 0 ;
case WM_SIZE :
cxBlock = LOWORD (lParam) / DIVISIONS ;
cyBlock = HIWORD (lParam) / DIVISIONS ;
for (x = 0 ; x < DIVISIONS ; x++)
for (y = 0 ; y < DIVISIONS ; y++)
MoveWindow (hwndChild[x][y],
x * cxBlock, y * cyBlock,
cxBlock, cyBlock, TRUE) ;
return 0 ;
case WM_LBUTTONDOWN :
MessageBeep (0) ;
return 0 ;
case WM_DESTROY :
PostQuitMessage (0) ;
return 0 ;
}
return DefWindowProc (hwnd, message, wParam, lParam) ;
}LRESULT CALLBACK ChildWndProc (HWND hwnd, UINT message,
WPARAM wParam, LPARAM lParam)
{
HDC hdc ;
PAINTSTRUCT ps ;
RECT rect ;
switch (message)
{
case WM_CREATE :
SetWindowLong (hwnd, 0, 0) ; // on/off flag
return 0 ;
case WM_LBUTTONDOWN :
SetWindowLong (hwnd, 0, 1 ^ GetWindowLong (hwnd, 0)) ;
InvalidateRect (hwnd, NULL, FALSE) ;
return 0 ;
case WM_PAINT :
hdc = BeginPaint (hwnd, &ps) ;
GetClientRect (hwnd, &rect) ;
Rectangle (hdc, 0, 0, rect.right, rect.bottom) ;
if (GetWindowLong (hwnd, 0))
{
MoveToEx (hdc, 0, 0, NULL) ;
LineTo (hdc, rect.right, rect.bottom) ;
MoveToEx (hdc, 0, rect.bottom, NULL) ;
LineTo (hdc, rect.right, 0) ;
}
EndPaint (hwnd, &ps) ;
return 0 ;
}
return DefWindowProc (hwnd, message, wParam, lParam) ;
}
-----------------------------------
这个程序就是创建一个主窗口,再在这个主窗口的基础上创建25个子窗口,用这25个子窗口响应鼠标。这里有一个主窗口类,有一个子窗口类(包括了25个子窗口)程序里分别注册了主窗口类和子窗口类(两处都用RegisterClass(&wndclass),wndclass里对应lpfnWndProc的值分别为WndProc和ChildWndProc)。
问题:
1、这里windows是怎么判断鼠标点击是在子窗口上还是主窗口上的?windows是怎么知道发消息给子窗口过程还是主窗口过程函数的?上面的程序里哪里体现出来?
2、鼠标点击时,windows是怎么区分是在哪个子窗口上点击的?这个程序里又是怎么体现的?
3、子窗口过程函数里SetWindowLong和GerWindowLong函数什么意思?不是很理解^_^
《windows程序设计》书上第七章P274有例子如下:
-----------------------------------
/*-------------------------------------------------
CHECKER3.C -- Mouse Hit-Test Demo Program No. 3
(c) Charles Petzold, 1998
-------------------------------------------------*/#include <windows.h>#define DIVISIONS 5LRESULT CALLBACK WndProc (HWND, UINT, WPARAM, LPARAM) ;
LRESULT CALLBACK ChildWndProc (HWND, UINT, WPARAM, LPARAM) ;TCHAR szChildClass[] = TEXT ("Checker3_Child") ;int WINAPI WinMain (HINSTANCE hInstance, HINSTANCE hPrevInstance,
PSTR szCmdLine, int iCmdShow)
{
static TCHAR szAppName[] = TEXT ("Checker3") ;
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 ;
}
wndclass.lpfnWndProc = ChildWndProc ;
wndclass.cbWndExtra = sizeof (long) ;
wndclass.hIcon = NULL ;
wndclass.lpszClassName = szChildClass ;
RegisterClass (&wndclass) ;
hwnd = CreateWindow (szAppName, TEXT ("Checker3 Mouse Hit-Test 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 ;
}LRESULT CALLBACK WndProc (HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)
{
static HWND hwndChild[DIVISIONS][DIVISIONS] ;
int cxBlock, cyBlock, x, y ;
switch (message)
{
case WM_CREATE :
for (x = 0 ; x < DIVISIONS ; x++)
for (y = 0 ; y < DIVISIONS ; y++)
hwndChild[x][y] = CreateWindow (szChildClass, NULL,
WS_CHILDWINDOW | WS_VISIBLE,
0, 0, 0, 0,
hwnd, (HMENU) (y << 8 | x),
(HINSTANCE) GetWindowLong (hwnd, GWL_HINSTANCE),
NULL) ;
return 0 ;
case WM_SIZE :
cxBlock = LOWORD (lParam) / DIVISIONS ;
cyBlock = HIWORD (lParam) / DIVISIONS ;
for (x = 0 ; x < DIVISIONS ; x++)
for (y = 0 ; y < DIVISIONS ; y++)
MoveWindow (hwndChild[x][y],
x * cxBlock, y * cyBlock,
cxBlock, cyBlock, TRUE) ;
return 0 ;
case WM_LBUTTONDOWN :
MessageBeep (0) ;
return 0 ;
case WM_DESTROY :
PostQuitMessage (0) ;
return 0 ;
}
return DefWindowProc (hwnd, message, wParam, lParam) ;
}LRESULT CALLBACK ChildWndProc (HWND hwnd, UINT message,
WPARAM wParam, LPARAM lParam)
{
HDC hdc ;
PAINTSTRUCT ps ;
RECT rect ;
switch (message)
{
case WM_CREATE :
SetWindowLong (hwnd, 0, 0) ; // on/off flag
return 0 ;
case WM_LBUTTONDOWN :
SetWindowLong (hwnd, 0, 1 ^ GetWindowLong (hwnd, 0)) ;
InvalidateRect (hwnd, NULL, FALSE) ;
return 0 ;
case WM_PAINT :
hdc = BeginPaint (hwnd, &ps) ;
GetClientRect (hwnd, &rect) ;
Rectangle (hdc, 0, 0, rect.right, rect.bottom) ;
if (GetWindowLong (hwnd, 0))
{
MoveToEx (hdc, 0, 0, NULL) ;
LineTo (hdc, rect.right, rect.bottom) ;
MoveToEx (hdc, 0, rect.bottom, NULL) ;
LineTo (hdc, rect.right, 0) ;
}
EndPaint (hwnd, &ps) ;
return 0 ;
}
return DefWindowProc (hwnd, message, wParam, lParam) ;
}
-----------------------------------
这个程序就是创建一个主窗口,再在这个主窗口的基础上创建25个子窗口,用这25个子窗口响应鼠标。这里有一个主窗口类,有一个子窗口类(包括了25个子窗口)程序里分别注册了主窗口类和子窗口类(两处都用RegisterClass(&wndclass),wndclass里对应lpfnWndProc的值分别为WndProc和ChildWndProc)。
问题:
1、这里windows是怎么判断鼠标点击是在子窗口上还是主窗口上的?windows是怎么知道发消息给子窗口过程还是主窗口过程函数的?上面的程序里哪里体现出来?
2、鼠标点击时,windows是怎么区分是在哪个子窗口上点击的?这个程序里又是怎么体现的?
3、子窗口过程函数里SetWindowLong和GerWindowLong函数什么意思?不是很理解^_^
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-----------------------------------
/*----------------------------------------
COLORS1.C -- Colors Using Scroll Bars
(c) Charles Petzold, 1998
----------------------------------------*/#include <windows.h>LRESULT CALLBACK WndProc (HWND, UINT, WPARAM, LPARAM) ;
LRESULT CALLBACK ScrollProc (HWND, UINT, WPARAM, LPARAM) ;int idFocus ;
WNDPROC OldScroll[3] ;int WINAPI WinMain (HINSTANCE hInstance, HINSTANCE hPrevInstance,
PSTR szCmdLine, int iCmdShow)
{
static TCHAR szAppName[] = TEXT ("Colors1") ;
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 = CreateSolidBrush (0) ;
wndclass.lpszMenuName = NULL ;
wndclass.lpszClassName = szAppName ;
if (!RegisterClass (&wndclass))
{
MessageBox (NULL, TEXT ("This program requires Windows NT!"),
szAppName, MB_ICONERROR) ;
return 0 ;
}
hwnd = CreateWindow (szAppName, TEXT ("Color Scroll"),
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 ;
}LRESULT CALLBACK WndProc (HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)
{
static COLORREF crPrim[3] = { RGB (255, 0, 0), RGB (0, 255, 0),
RGB (0, 0, 255) } ;
static HBRUSH hBrush[3], hBrushStatic ;
static HWND hwndScroll[3], hwndLabel[3], hwndValue[3], hwndRect ;
static int color[3], cyChar ;
static RECT rcColor ;
static TCHAR * szColorLabel[] = { TEXT ("Red"), TEXT ("Green"),
TEXT ("Blue") } ;
HINSTANCE hInstance ;
int i, cxClient, cyClient ;
TCHAR szBuffer[10] ;
switch (message)
{
case WM_CREATE :
hInstance = (HINSTANCE) GetWindowLong (hwnd, GWL_HINSTANCE) ;
// Create the white-rectangle window against which the
// scroll bars will be positioned. The child window ID is 9.
hwndRect = CreateWindow (TEXT ("static"), NULL,
WS_CHILD | WS_VISIBLE | SS_WHITERECT,
0, 0, 0, 0,
hwnd, (HMENU) 9, hInstance, NULL) ;
for (i = 0 ; i < 3 ; i++)
{
// The three scroll bars have IDs 0, 1, and 2, with
// scroll bar ranges from 0 through 255.
hwndScroll[i] = CreateWindow (TEXT ("scrollbar"), NULL,
WS_CHILD | WS_VISIBLE |
WS_TABSTOP | SBS_VERT,
0, 0, 0, 0,
hwnd, (HMENU) i, hInstance, NULL) ;
SetScrollRange (hwndScroll[i], SB_CTL, 0, 255, FALSE) ;
SetScrollPos (hwndScroll[i], SB_CTL, 0, FALSE) ;
// The three color-name labels have IDs 3, 4, and 5,
// and text strings "Red", "Green", and "Blue".
hwndLabel [i] = CreateWindow (TEXT ("static"), szColorLabel[i],
WS_CHILD | WS_VISIBLE | SS_CENTER,
0, 0, 0, 0,
hwnd, (HMENU) (i + 3),
hInstance, NULL) ;
// The three color-value text fields have IDs 6, 7,
// and 8, and initial text strings of "0".
hwndValue [i] = CreateWindow (TEXT ("static"), TEXT ("0"),
WS_CHILD | WS_VISIBLE | SS_CENTER,
0, 0, 0, 0,
hwnd, (HMENU) (i + 6),
hInstance, NULL) ;///////////////////////////////////////////注:SetWindowLong函数在这
OldScroll[i] = (WNDPROC) SetWindowLong (hwndScroll[i],
GWL_WNDPROC, (LONG) ScrollProc) ;
hBrush[i] = CreateSolidBrush (crPrim[i]) ;
}
hBrushStatic = CreateSolidBrush (
GetSysColor (COLOR_BTNHIGHLIGHT)) ;
cyChar = HIWORD (GetDialogBaseUnits ()) ;
return 0 ;
cxClient = LOWORD (lParam) ;
cyClient = HIWORD (lParam) ;
SetRect (&rcColor, cxClient / 2, 0, cxClient, cyClient) ;
MoveWindow (hwndRect, 0, 0, cxClient / 2, cyClient, TRUE) ;
for (i = 0 ; i < 3 ; i++)
{
MoveWindow (hwndScroll[i],
(2 * i + 1) * cxClient / 14, 2 * cyChar,
cxClient / 14, cyClient - 4 * cyChar, TRUE) ;
MoveWindow (hwndLabel[i],
(4 * i + 1) * cxClient / 28, cyChar / 2,
cxClient / 7, cyChar, TRUE) ;
MoveWindow (hwndValue[i],
(4 * i + 1) * cxClient / 28,
cyClient - 3 * cyChar / 2,
cxClient / 7, cyChar, TRUE) ;
}
SetFocus (hwnd) ;
return 0 ;
case WM_SETFOCUS :
SetFocus (hwndScroll[idFocus]) ;
return 0 ;
case WM_VSCROLL :
i = GetWindowLong ((HWND) lParam, GWL_ID) ;
switch (LOWORD (wParam))
{
case SB_PAGEDOWN :
color[i] += 15 ;
// fall through
case SB_LINEDOWN :
color[i] = min (255, color[i] + 1) ;
break ;
case SB_PAGEUP :
color[i] -= 15 ;
// fall through
case SB_LINEUP :
color[i] = max (0, color[i] - 1) ;
break ;
case SB_TOP :
color[i] = 0 ;
break ;
case SB_BOTTOM :
color[i] = 255 ;
break ;
case SB_THUMBPOSITION :
case SB_THUMBTRACK :
color[i] = HIWORD (wParam) ;
break ;
default :
break ;
}
SetScrollPos (hwndScroll[i], SB_CTL, color[i], TRUE) ;
wsprintf (szBuffer, TEXT ("%i"), color[i]) ;
SetWindowText (hwndValue[i], szBuffer) ;
DeleteObject ((HBRUSH)
SetClassLong (hwnd, GCL_HBRBACKGROUND, (LONG)
CreateSolidBrush (RGB (color[0], color[1], color[2])))) ;
InvalidateRect (hwnd, &rcColor, TRUE) ;
return 0 ;
case WM_CTLCOLORSCROLLBAR :
i = GetWindowLong ((HWND) lParam, GWL_ID) ;
return (LRESULT) hBrush[i] ;
case WM_CTLCOLORSTATIC :
i = GetWindowLong ((HWND) lParam, GWL_ID) ;
if (i >= 3 && i <= 8) // static text controls
{
SetTextColor ((HDC) wParam, crPrim[i % 3]) ;
SetBkColor ((HDC) wParam, GetSysColor (COLOR_BTNHIGHLIGHT));
return (LRESULT) hBrushStatic ;
}
break ;
case WM_SYSCOLORCHANGE :
DeleteObject (hBrushStatic) ;
hBrushStatic = CreateSolidBrush (GetSysColor (COLOR_BTNHIGHLIGHT)) ;
return 0 ;
case WM_DESTROY :
DeleteObject ((HBRUSH)
SetClassLong (hwnd, GCL_HBRBACKGROUND, (LONG)
GetStockObject (WHITE_BRUSH))) ;
for (i = 0 ; i < 3 ; i++)
DeleteObject (hBrush[i]) ;
DeleteObject (hBrushStatic) ;
PostQuitMessage (0) ;
return 0 ;
}
return DefWindowProc (hwnd, message, wParam, lParam) ;
}
LRESULT CALLBACK ScrollProc (HWND hwnd, UINT message,
WPARAM wParam, LPARAM lParam)
{
int id = GetWindowLong (hwnd, GWL_ID) ;
switch (message)
{
case WM_KEYDOWN :
if (wParam == VK_TAB)
SetFocus (GetDlgItem (GetParent (hwnd),
(id + (GetKeyState (VK_SHIFT) < 0 ? 2 : 1)) % 3)) ;
break ;
case WM_SETFOCUS :
idFocus = id ;
break ;
}
return CallWindowProc (OldScroll[id], hwnd, message, wParam, lParam) ;
}
-----------------------------------
这个例子利用子窗口进行工作,程序使用10个子窗口控制:3个滚动条、6个静态文本窗口和1个静态矩形框。例子中也是创建了两个窗口过程函数:一个WndProc,另一个ScrollProc。问题:
1、这里ScrollProc窗口过程函数是为3个滚动条子窗口服务的吧?是不是就是说我在窗口上用鼠标拖动这三个滚动条,windows就发消息给ScrollProc这个窗口过程函数?程序里有这么一句话:OldScroll[i](WNDPROC)SetWindowLong(hwndScroll[i],GWL_WNDPROC,(LONG)ScrollProc),到底是这句话调用ScrollProc窗口过程函数还是windows系统自身调用这个函数发消息给它(像前面一句所说的)?这个和上面讲的第七章的那个例子子窗口过程函数有什么不同?那个ChildWndProc是windows操作系统直接发消息给它的吧,好像没有像这个程序里的有SetWindowLong函数调用,到底什么区别?2、另外6个静态文本窗口和1个静态矩形框子窗口的窗口过程函数在哪里?是不是在windows系统里默认就有?为什么?我在后面这7个子窗口点击,windows有哪些处理?3、OldScroll[i](WNDPROC)SetWindowLong(hwndScroll[i],GWL_WNDPROC,(LONG)ScrollProc)这个函数以及GetWindowLong函数到底什么意思?其中的参数ScrollProc是函数ScrollProc的地址,ScrollProc称为回调函数,到底什么叫回调函数,什么用?是不是所有的窗口过程函数都是回调函数?4、例子中ScrollProc函数里最后这句return CallWindowProc (OldScroll[id], hwnd,
message, wParam, lParam)什么意思?怎么不是通常的return DefWindowProc (hwnd, message,wParam, lParam)?5、子窗口发消息给父窗口以及父窗口发消息给子窗口到底怎么回事,中间有通过windows操作系统吗?子窗口、父窗口不是直接和windows系统联系的?这个程序里有子窗口和父窗口相互发消息吗?怎么体现的?
2.子窗口都是窗口,手标点在哪个窗口上事件消息发送到哪个窗口的wndproc里,除非有个子窗口调用了SetCapture();, 在它调用ReleaseCapture();之前,所有的手标事件都将发送到它的wndproc里
3.GetWindowLong();&SetWindowLong();是用来获取和设置WNDCLASS结构中的各个值的,如GetWindowLong(hWnd,0);是获取WNDCLASS.cbWndExtra中的值的,SetWindowLong(hWnd,GWL_WNDPROC,newWndProc);就是用来设置新的wndproc到hWnd句柄所指的窗口的
message, wParam, lParam)什么意思?怎么不是通常的return DefWindowProc (hwnd, message,wParam, lParam)?
这里其实就是用到了所谓的"子窗口挂钩";就是先SetWindowLong(hwndScroll[i],GWL_WNDPROC,(LONG)ScrollProc);使得用ScrollProc这个窗口处理函数来处理hwndScroll所指的窗口的窗口处理过程,这样我们就可以处理键盘事件,使焦点从一个子窗口转移到另一个子窗口,处理好之后,我们还是要调用原先的窗口处理过程就是OldScroll[id],用这个方法我们可以不必从头重新写窗口处理过程,而有可以加上我们自己的处理