关于WM_INITDIALOG windows程序设计示例和MSDN解析中的冲突

可以重点看下我突出的部分:这是一个有对话框的简单示例程序<<windows程序设计示例>>第11章 about2.
case WM_INITDIALOG:
iColor  = iCurrentColor ;
iFigure = iCurrentFigure ;
CheckRadioButton (hDlg, IDC_BLACK, IDC_WHITE,   iColor) ;
CheckRadioButton (hDlg, IDC_RECT,  IDC_ELLIPSE, iFigure) ; hCtrBlock = GetDlgItem (hDlg, IDC_PAINT) ; SetFocus (GetDlgItem (hDlg, iColor)) ; //SetFocus ((HWND)wParam) ; return FALSE ;
这里设置了获得键盘焦点的子控件,为什么还要返回False 根据MSDN上的解析,应该返回TRUE的:
(The dialog box procedure should return TRUE to direct the system to set the keyboard focus to the control specified by wParam. Otherwise, it should return FALSE to prevent the system from setting the default keyboard focus. )而实际上经过测试,返回False是对的,难道MSDN上解析有误吗,所以我迷了,请高人解答,在线等,好了马上结贴给分分啊,谢谢了
以上这个示列的完整的代码,可看看不看啊
#include <Windows.h>
#include "resource.h"LRESULT CALLBACK WndProc(HWND,UINT,WPARAM,LPARAM);
BOOL CALLBACK AboutDlgProc(HWND,UINT,WPARAM,LPARAM);int iCurrentColor  = IDC_BLACK, 
    iCurrentFigure = IDC_RECT;int WINAPI WinMain(HINSTANCE hInstance,HINSTANCE hPrevInstance,
   PSTR szCmdLine,int iCmdShow)
{
static TCHAR szAppName[] = TEXT("About2");
MSG msg;
HWND hwnd;
WNDCLASS wndclass;

wndclass.style         = CS_HREDRAW | CS_VREDRAW;
wndclass.lpfnWndProc   = WndProc;
wndclass.cbClsExtra    = 0;
wndclass.cbWndExtra    = 0;
wndclass.hInstance     = hInstance;
wndclass.hIcon         = LoadIcon(hInstance,szAppName);
wndclass.hCursor       = LoadCursor(NULL,IDC_ARROW);
wndclass.hbrBackground =(HBRUSH)GetStockObject(WHITE_BRUSH);
wndclass.lpszMenuName  = szAppName;
wndclass.lpszClassName = szAppName; if (!RegisterClass(&wndclass))
{
MessageBox(NULL,TEXT("This program requires Windows NT!"),
szAppName,MB_ICONERROR);
return 0;
} hwnd = CreateWindow(szAppName,TEXT("About Box Demo Program"),
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 PaintWindow(HWND hwnd,int iColor,int iFigure)
{
static COLORREF crColor[] = {RGB(  0,  0,  0),RGB(  0,  0,255),
                             RGB(  0,255,  0),RGB(  0,255,255),
                             RGB(255,  0,  0),RGB(255,  0,255),
                             RGB(255,255,  0),RGB(255,255,255)}; HBRUSH hBrush;
HDC hdc;
RECT rect; hdc = GetDC(hwnd);
GetClientRect(hwnd,&rect);
hBrush = CreateSolidBrush(crColor[iColor - IDC_BLACK]);
hBrush = (HBRUSH)SelectObject(hdc,hBrush);

if(iFigure ==IDC_RECT)
Rectangle(hdc,rect.left,rect.top,rect.right,rect.bottom);
else
Ellipse(hdc,rect.left,rect.top,rect.right,rect.bottom);
DeleteObject(SelectObject(hdc,hBrush));
ReleaseDC(hwnd,hdc);
}void PaintTheBlock(HWND hCtrl,int iColor,int iFigure)
{
InvalidateRect(hCtrl,NULL,TRUE);
UpdateWindow(hCtrl);
PaintWindow(hCtrl,iColor,iFigure);
}LRESULT CALLBACK WndProc(HWND hwnd,UINT message,WPARAM wParam,LPARAM lParam)
{
static HINSTANCE hInstance;
PAINTSTRUCT ps; switch (message)
{
case WM_CREATE:
hInstance = ((LPCREATESTRUCT)lParam)->hInstance;
return 0; case WM_COMMAND:
switch(LOWORD(wParam))
{
case IDM_APP_ABOUT:
if(DialogBox(hInstance,TEXT("AboutBox"),hwnd,AboutDlgProc))
InvalidateRect(hwnd,NULL,TRUE);
return 0;
}
break;
case WM_PAINT:
BeginPaint(hwnd,&ps);
EndPaint(hwnd,&ps); PaintWindow(hwnd,iCurrentColor,iCurrentFigure);
return 0; case WM_DESTROY:
PostQuitMessage(0);
return 0;
}
return DefWindowProc(hwnd,message,wParam,lParam);
}BOOL CALLBACK AboutDlgProc(HWND hDlg,UINT message,WPARAM wParam,LPARAM lParam)
{
static HWND hCtrBlock;
static int iColor,iFigure; switch(message)
{
case WM_INITDIALOG:
iColor  = iCurrentColor ;
iFigure = iCurrentFigure ;
CheckRadioButton (hDlg, IDC_BLACK, IDC_WHITE,   iColor) ;
CheckRadioButton (hDlg, IDC_RECT,  IDC_ELLIPSE, iFigure) ; hCtrBlock = GetDlgItem (hDlg, IDC_PAINT) ; SetFocus (GetDlgItem (hDlg, iColor)) ;
//SetFocus ((HWND)wParam) ; return FALSE ; case WM_COMMAND:
switch(LOWORD(wParam))
{
case IDOK:
iCurrentColor  = iColor;
iCurrentFigure = iFigure;
EndDialog(hDlg,TRUE);
return TRUE; case IDCANCEL:
EndDialog(hDlg,FALSE);
return TRUE; case IDC_BLACK:
case IDC_RED:
case IDC_GREEN:
case IDC_YELLOW:
case IDC_BLUE:
case IDC_MAGENTA:
case IDC_CYAN:
case IDC_WHITE:
iColor = LOWORD(wParam);
CheckRadioButton(hDlg,IDC_BLACK,IDC_WHITE,LOWORD(wParam));
PaintTheBlock(hCtrBlock,iColor,iFigure);
return TRUE;
case IDC_RECT:
case IDC_ELLIPSE:
iFigure = LOWORD(wParam);
CheckRadioButton(hDlg,IDC_RECT,IDC_ELLIPSE,LOWORD(wParam));
PaintTheBlock(hCtrBlock,iColor,iFigure);
return TRUE;
}
break;
case WM_PAINT:
PaintTheBlock(hCtrBlock,iColor,iFigure);
break;
}
return FALSE;
}