请问关于父窗口和字窗口的焦点问题

Question

我在使用win32编成，我现在自己注册了一个窗口类，并且自己定义了一个窗口过程，然后再创建窗口的时候，指定为子窗口，然后父窗口是 windows默认注册的那个，现在我的问题是，程序运行后我单击子窗口，或者父窗口的时候，这些响应消息都不发送了，因为我在子窗口和父窗口的WM_LBUTTONDWON,中写了输出文本框，但是都没有收到，这是怎么回事儿呢。

Answer 1

好的，下面是我的主要代码:两个窗口类的注册:
//
ATOM MyRegisterClass(HINSTANCE hInstance)
{
WNDCLASSEX wcex; wcex.cbSize = sizeof(WNDCLASSEX); wcex.style = CS_HREDRAW | CS_VREDRAW | CS_DBLCLKS;
wcex.lpfnWndProc = WndProc;
wcex.cbClsExtra = 0;
wcex.cbWndExtra = 0;
wcex.hInstance = hInstance;
wcex.hIcon = LoadIcon(hInstance, MAKEINTRESOURCE(IDI_WINDOWSSCREEN));
wcex.hCursor = LoadCursor(NULL, IDC_ARROW);
wcex.hbrBackground = (HBRUSH)(COLOR_WINDOW+1);
wcex.lpszMenuName = MAKEINTRESOURCE(IDC_BASICPRACAPP);
wcex.lpszClassName = szWindowClass;
wcex.hIconSm = LoadIcon(wcex.hInstance, MAKEINTRESOURCE(IDI_WINDOWSSCREEN)); return RegisterClassEx(&wcex);
}ATOM RegisterClassChild(HINSTANCE hInstance)
{
WNDCLASSEX wcex; wcex.cbSize = sizeof(WNDCLASSEX); wcex.style = CS_HREDRAW | CS_VREDRAW | CS_DBLCLKS;
wcex.lpfnWndProc = WndChildProc;
wcex.cbClsExtra = 0;
wcex.cbWndExtra = 0;
wcex.hInstance = hInstance;
wcex.hIcon = LoadIcon(hInstance, MAKEINTRESOURCE(IDI_WINDOWSSCREEN));
wcex.hCursor = LoadCursor(NULL, IDC_ARROW);
wcex.hbrBackground = (HBRUSH)(COLOR_WINDOW+1);
wcex.lpszMenuName = MAKEINTRESOURCE(IDC_BASICPRACAPP);
wcex.lpszClassName = szWindowClassChild;
wcex.hIconSm = LoadIcon(wcex.hInstance, MAKEINTRESOURCE(IDI_WINDOWSSCREEN)); return RegisterClassEx(&wcex);
}BOOL InitInstanceChild(HINSTANCE hInstance, HWND hwndParent, int nCmdShow)
{
HWND hWndChild;
hWndChild = CreateWindowEx(WS_EX_CLIENTEDGE, szWindowClassChild,
TEXT("ChildWindows"),WS_CHILD | WS_VISIBLE | WS_CAPTION | WS_SYSMENU,
200, 100, 200, 100, hwndParent, HMENU(1000), hInstance, NULL); if (!hWndChild)
{
ErrorExit(TEXT("GetProcessId")); }
::hWndChild = hWndChild;
//ShowWindow(hWndChild,nCmdShow);
//UpdateWindow(hWndChild);
return TRUE;
}
BOOL InitInstance(HINSTANCE hInstance, int nCmdShow)
{
   HWND hWnd;   hInst = hInstance; // Store instance handle in our global variable   hWnd = CreateWindow(szWindowClass, szTitle, WS_OVERLAPPEDWINDOW,
      CW_USEDEFAULT, 0, CW_USEDEFAULT, 0, NULL, NULL, hInstance, NULL);   if (!hWnd)
   {
      return FALSE;
   }
   DragAcceptFiles(hWnd,TRUE);
   ShowWindow(hWnd, nCmdShow);
   UpdateWindow(hWnd);   InitInstanceChild(hInstance,hWnd,nCmdShow);
   return TRUE;
}//主窗口类的窗口过程
LRESULT CALLBACK WndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)
{
int wmId, wmEvent;
PAINTSTRUCT ps;
HDC hdc;
static HWND hwndBtnColr;
static HWND hwndBtnFont;
static HWND hwndBtnText;
static int cxChar,cyChar;
static int cxPos = 10,cyPos = 10;
static int iRed = 0,iGreen = 50,iBlue = 100;
static CHOOSECOLOR cc;
static COLORREF crCustColors[16];
static COLORREF crTextRef = RGB(0x80,0x80,0x80);
static CHOOSEFONT cf;
static LOGFONT lf;
static bool bFlag = false;
RECT rt;
static HCURSOR hOldCursor;
static HWND hWndToolBar; switch (message)
{
case WM_CREATE:
cxChar = LOWORD(GetDialogBaseUnits());
cyChar = HIWORD(GetDialogBaseUnits());// hWndToolBar = CreateSimpleToolbar(hWnd);
break;
case WM_COMMAND:
wmId    = LOWORD(wParam);
wmEvent = HIWORD(wParam);
// Parse the menu selections:
switch (wmId)
{ case IDM_NEW:
MessageBox(hWnd,TEXT("aaa"),TEXT("bbbbb"),0);
break;
case IDM_CHGCOLOR: cc.lStructSize = sizeof(CHOOSECOLOR);
cc.hwndOwner = hWnd;
cc.hInstance = NULL;
cc.rgbResult = crTextRef;
cc.lpCustColors = crCustColors;
cc.Flags = CC_RGBINIT | CC_FULLOPEN;
cc.lCustData = 0;
cc.lpfnHook = NULL;
cc.lpTemplateName = NULL;
ChooseColor(&cc);
crTextRef = cc.rgbResult;
InvalidateRect(hWnd,NULL,TRUE);
break;
case IDM_CHGFRONT:
cf.lStructSize = sizeof(CHOOSEFONT);
cf.hwndOwner = hWnd;
cf.hDC = NULL;
cf.lpLogFont = &lf;
cf.iPointSize = 0;
cf.Flags = CF_INITTOLOGFONTSTRUCT |
  CF_SCREENFONTS | CF_EFFECTS;
cf.rgbColors = 0;
cf.lCustData = 0;
cf.lpfnHook = NULL;
cf.lpTemplateName = NULL;
cf.hInstance = NULL;
cf.lpszStyle = NULL;
cf.nFontType = 0;
cf.nSizeMin = 0;
cf.nSizeMax = 0;
ChooseFont(&cf);
//cxChar = cf.lpLogFont->lfWidth;
//cyChar = cf.lpLogFont->lfHeight;
InvalidateRect(hWnd,NULL,TRUE);

break;
case IDM_CHGTEXT:
hDlgModeless = CreateDialog(hInst,MAKEINTRESOURCE(IDD_DIALOG),
hWnd,DlgProc);
SetFocus(hDlgModeless);
break;
case ID_FILE_OPEN:
hDlgModeless = CreateDialog(hInst,MAKEINTRESOURCE(IDD_DIALOG),
hWnd,DlgProc);
break;
case ID_FILE_CLOSEDIALOG:
SendMessage(hDlgModeless,SWM_EXIT,0,0);
break;
case IDM_ABOUT:
DialogBox(hInst, MAKEINTRESOURCE(IDD_ABOUTBOX), hWnd, About);
break;
case IDM_EXIT:
DestroyWindow(hWnd);
break;
}
return 0;
case WM_LBUTTONDOWN:
MessageBox(NULL,TEXT("Parent Wind lbuttondown"),TEXT("Parent Wind lbuttondown"),0);
if (( LOWORD(lParam) >= cxPos &&
LOWORD(lParam) <= (cxPos + cxChar * sizeof(szTextOput))) &&
(HIWORD(lParam) >= cyPos && HIWORD(lParam) <= (cyPos + cyChar) ))
bFlag = true;
break;
case WM_LBUTTONUP:
if (true == bFlag)
{
cxPos = LOWORD(lParam);
cyPos = HIWORD(lParam);
}
bFlag = false;
SetCursor(hOldCursor);
InvalidateRect(hWnd,NULL,TRUE);
break;
case WM_MOUSEMOVE:
if ((wParam & MK_LBUTTON) && bFlag)
{ hOldCursor = SetCursor(LoadCursor(NULL,IDC_CROSS));
}
return 0; case WM_KEYDOWN:
switch(wParam)
{
case VK_ESCAPE:
SendMessage(hWnd,WM_CLOSE,0,0);
break;
}
break;
case WM_PAINT:
hdc = BeginPaint(hWnd,&ps);

SetBkColor(hdc,0xffffff);
SelectObject(hdc,CreateFontIndirect(&lf));
SetTextColor(hdc, crTextRef);
TextOut(hdc,cxPos,cyPos,szTextOput,MAX_LOADSTRING); EndPaint(hWnd,&ps);
break;
case WM_DROPFILES :
//MessageBox(hWnd,TEXT("file drop"),TEXT("a file drop"),0);
break;
case WM_DESTROY:
PostQuitMessage(0);
break;
case WM_KILLFOCUS:
MessageBox(NULL,TEXT("parent lost focus"),TEXT("parent lost focus"),0);
break;
case WM_SETFOCUS:
MessageBox(NULL,TEXT("parent get focus"),TEXT("parent get focus"),0);
SetFocus(hWndToolBar);
default:
return DefWindowProc(hWnd, message, wParam, lParam);
}
return 0;
}
//子窗口类的过程LRESULT CALLBACK WndChildProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)
{
switch (message)
{
case WM_CREATE:
break;
case WM_COMMAND:
break;
case WM_LBUTTONDOWN:
MessageBox(NULL,TEXT("Child Wind lbuttondown"),TEXT("Child Wind lbuttondown"),0);
break;
case WM_LBUTTONUP:
break;
case WM_MOUSEMOVE:
break;
case WM_KEYDOWN:
break;
case WM_PAINT:
break;
case WM_DESTROY:
PostQuitMessage(0);
break;
case WM_SETFOCUS:
//SetFocus(GetParent(hWnd));
MessageBox(NULL,TEXT("child get focus"),TEXT("child get focus"),0);
break;
case WM_KILLFOCUS:
//SetFocus(GetParent(hWnd));
MessageBox(NULL,TEXT("child lost focus"),TEXT("child lost focus"),0);
break;
default:
return DefWindowProc(hWnd, message, wParam, lParam);
}
return 0;
}

Answer 2

还有这个是main函数 
int APIENTRY _tWinMain(HINSTANCE hInstance,
                     HINSTANCE hPrevInstance,
                     LPTSTR    lpCmdLine,
                     int       nCmdShow)
{
UNREFERENCED_PARAMETER(hPrevInstance);
UNREFERENCED_PARAMETER(lpCmdLine);  // TODO: Place code here.
MSG msg;
HACCEL hAccelTable; // Initialize global strings
LoadString(hInstance, IDS_APP_TITLE, szTitle, MAX_LOADSTRING);
LoadString(hInstance, IDC_BASICPRACAPP, szWindowClass, MAX_LOADSTRING);
MyRegisterClass(hInstance);
if (!RegisterClassChild(hInstance))
{
MessageBox(NULL,TEXT("ChildClass Register faild"),TEXT("ChildClass Register faild"),0);
}
// Perform application initialization:
if (!InitInstance (hInstance, nCmdShow))
{
return FALSE;
} hAccelTable = LoadAccelerators(hInstance, MAKEINTRESOURCE(IDC_BASICPRACAPP)); // Main message loop:
while (GetMessage(&msg, NULL, 0, 0))
{
if (hDlgModeless == 0 || !IsDialogMessage(hDlgModeless,&msg))
{
if (!TranslateAccelerator(msg.hwnd, hAccelTable, &msg))
{
TranslateMessage(&msg);
DispatchMessage(&msg);
}
} } return (int) msg.wParam;
}

Answer 3

少用‘MessageBox’它会改变焦点。
用OutputDebugString（“xxx”）来代替。hWndChild = CreateWindowEx(WS_EX_CLIENTEDGE, szWindowClassChild,
TEXT("ChildWindows"),WS_CHILD | WS_VISIBLE | WS_CAPTION | WS_SYSMENU,
200, 100, 200, 100, hwndParent, HMENU(1000), hInstance, NULL);成功没有？