CHECKER4,看迷茫了

Question

windows程序设计 第7章中的 CHECKER4 中。主窗口：
hwnd=CreateWindow(
szAppName,
TEXT("Checker4 Mouse Hit-Test Demo"),
WS_OVERLAPPEDWINDOW,
CW_USEDEFAULT,CW_USEDEFAULT,
CW_USEDEFAULT,CW_USEDEFAULT,
NULL,NULL,hInstance,NULL);
子窗口：
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);hwnd是主窗口柄。那么子窗口的回调函数中：LRESULT CALLBACK ChildWndProc(HWND hwnd,UINT message,WPARAM wParam,LPARAM lParam)
{
//...
switch(message)
{
        case WM_SETFOCUS:
idFocus=GetWindowLong(hwnd,GWL_ID);
                return 0;
         }
//....
}
中的GetWindowLong(hwnd,GWL_ID)是什么意思。
获得主窗口的ID吗，可以主窗口哪有ID啊，不是NULL吗？那么GetWindowLong(hwnd,GWL_ID)得到的到底是什么？

Answer 1

GetWindowLong(hwnd,GWL_ID)就是获取窗口ID
虽然你设的是NULL
但这个函数的功能还是那样

Answer 2

 idFocus=GetWindowLong(hwnd,GWL_ID);
执行后idFocus应该是0才对啰.但调试时，击键后（0，0）块除外，iFocus就不等于0.全代码如下：
#include <Windows.h>#define DIVISIONS 5LRESULT CALLBACK WndProc(HWND hwnd,UINT message,WPARAM wParam,LPARAM lParam);
LRESULT CALLBACK ChildWndProc(HWND hwnd,UINT message,WPARAM wParam,LPARAM lParam);
TCHAR szChildClass[]=TEXT("Checker3_Child");
int idFocus=0;int WINAPI WinMain( HINSTANCE hInstance,HINSTANCE hPrevInstance,LPSTR lpCmdLine,int nShowCmd )
{
static TCHAR szAppName[]=TEXT("temp");
HWND hwnd;
MSG msg;
WNDCLASS wndclass; wndclass.cbClsExtra=0;
wndclass.cbWndExtra=0;
wndclass.hbrBackground=(HBRUSH)GetStockObject(WHITE_BRUSH);
wndclass.hCursor=LoadCursor(NULL,IDC_ARROW);
wndclass.hIcon=LoadIcon(NULL,IDI_APPLICATION);
wndclass.hInstance=hInstance;
wndclass.lpfnWndProc=WndProc;
wndclass.lpszClassName=szAppName;
wndclass.lpszMenuName=NULL;
wndclass.style=CS_HREDRAW | CS_VREDRAW; if(!RegisterClass(&wndclass))
{
MessageBox(NULL,TEXT("注册失败"),szAppName,MB_ICONERROR);
return 0;
}
wndclass.hCursor=LoadCursor(NULL,IDC_HAND);
wndclass.lpfnWndProc=ChildWndProc;
wndclass.hIcon=NULL;
wndclass.cbWndExtra=sizeof(long);
wndclass.lpszClassName=szChildClass;
if(!RegisterClass(&wndclass))
return 0; hwnd=CreateWindow(
szAppName,
TEXT("Checker4 Mouse Hit-Test Demo"),
WS_OVERLAPPEDWINDOW,
CW_USEDEFAULT,CW_USEDEFAULT,
CW_USEDEFAULT,CW_USEDEFAULT,
NULL,NULL,hInstance,NULL); ShowWindow(hwnd,nShowCmd);
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(MB_ICONERROR);
return 0;
case WM_SETFOCUS:
SetFocus(GetDlgItem(hwnd,idFocus));
return 0;
case WM_KEYDOWN:
x=idFocus & 0xFF;
y=idFocus>>8;
switch(wParam)
{
case VK_UP:
y--;
break;
case VK_DOWN:
y++;
break;
case VK_END:
x=y=DIVISIONS-1;
break;
case VK_HOME:
x=y=0;
break;
case VK_LEFT:
x--;
break;
case VK_RIGHT:
x++;
break;
default:
return 0;
}
x=(x+DIVISIONS)%DIVISIONS;
y=(y+DIVISIONS)%DIVISIONS;
idFocus=y<<8 | x;
SetFocus(GetDlgItem(hwnd,idFocus));
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);
return 0;
case WM_KEYDOWN:
if(wParam!=VK_RETURN && wParam !=VK_SPACE)
{
SendMessage(GetParent(hwnd),message,wParam,lParam);
return 0;
}
case WM_LBUTTONDOWN:
SetWindowLong(hwnd,0,1^GetWindowLong(hwnd,0));
SetFocus(hwnd);
InvalidateRect(hwnd,NULL,FALSE);
return 0;
case WM_SETFOCUS:
idFocus=GetWindowLong(hwnd,GWL_ID);
case WM_KILLFOCUS:
InvalidateRect(hwnd,NULL,TRUE);
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);
}
if(hwnd==GetFocus())
{
rect.left+=rect.right/10;
rect.right-=rect.left;
rect.top+=rect.bottom/10;
rect.bottom-=rect.top;
SelectObject(hdc,GetStockObject(NULL_BRUSH));
SelectObject(hdc,CreatePen(PS_DASH,0,0));
Rectangle(hdc,rect.left,rect.top,rect.right,rect.bottom);
DeleteObject(SelectObject(hdc,GetStockObject(BLACK_PEN)));
}
EndPaint(hwnd,&ps);
return 0;
}
return DefWindowProc(hwnd,message,wParam,lParam);
}

Answer 3

应该是传入NULL后系统自动分配的

Answer 4

LZ没认真吧hwnd=CreateWindow(...)这个hwnd是WinMain的局部变量idFocus=GetWindowLong(hwnd,GWL_ID);的hwnd是ChildWndProc(HWND hwnd,...)的参数而ChildWndProc是子窗口处理函数
GetWindowLong(hwnd,GWL_ID)就是获取子窗口ID，当然不为0咯

Answer 5

一语点醒！！
再问一句，点子窗口时，子窗口是不是先获得WM_FOCUS,再获得WM_KEYDOWN.

Answer 6

原来没用过Spy++，刚下了一个，怎么对窗口发送消息？
只看见里面有一堆父窗口句柄，上一个窗口句柄之类的东西，没看到有WM_SETFOCUS、WM_LBUTTONDOWN: