在第九章，我们建立了一个叫做POPPAD1的程序，它使用了子窗口编辑控件来实作基本的笔记本功能。在这一章中，我们将加入「File」和「Edit」菜单，并称此程序为POPPAD2。「Edit」菜单的菜单项的功能全部可用；我们将在第十一章中完成「File」功能，在第十三章中完成「Print」功能。POPPAD2如程序10-9所示。

程序10-9 POPPAD2

POPPAD2.C

/*---------------------------------------------------------------------------

POPPAD2.C -- Popup Editor Version 2 (includes menu)

(c) Charles Petzold, 1998

---------------------------------------------------------------------------*/

#include

#include "resource.h"

#define ID_EDIT 1

LRESULT CALLBACK WndProc (HWND, UINT, WPARAM, LPARAM);

TCHAR szAppName[] = TEXT ("PopPad2") ;

int WINAPI WinMain (HINSTANCE hInstance, HINSTANCE hPrevInstance,

PSTR szCmdLine, int iCmdShow)

{

HACCEL hAccel ;

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 (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, szAppName,

WS_OVERLAPPEDWINDOW,

GetSystemMetrics (SM_CXSCREEN) / 4,

GetSystemMetrics (SM_CYSCREEN) / 4,

GetSystemMetrics (SM_CXSCREEN) / 2,

GetSystemMetrics (SM_CYSCREEN) / 2,

NULL, NULL, hInstance, NULL) ;

ShowWindow (hwnd, iCmdShow) ;

UpdateWindow (hwnd) ;

hAccel = LoadAccelerators (hInstance, szAppName) ;

while (GetMessage (&msg, NULL, 0, 0))

{

if (!TranslateAccelerator (hwnd, hAccel, &msg))

{

TranslateMessage (&msg) ;

DispatchMessage (&msg) ;

}

}

return msg.wParam ;

}

AskConfirmation (HWND hwnd)

{

return MessageBox ( hwnd, TEXT ("Really want to close PopPad2?"),

szAppName, MB_YESNO | MB_ICONQUESTION) ;

}

LRESULT CALLBACK WndProc (HWND hwnd, UINT message, WPARAM wParam,LPARAM lParam)

{

static HWND hwndEdit ;

int iSelect, iEnable ;

switch (message)

{

case WM_CREATE:

hwndEdit = CreateWindow (TEXT ("edit"), NULL,

WS_CHILD | WS_VISIBLE | WS_HSCROLL | WS_VSCROLL |

WS_BORDER | ES_LEFT | ES_MULTILINE |

ES_AUTOHSCROLL | ES_AUTOVSCROLL,

0, 0, 0, 0, hwnd, (HMENU) ID_EDIT,

((LPCREATESTRUCT) lParam)->hInstance, NULL) ;

return 0 ;

case WM_SETFOCUS:

SetFocus (hwndEdit) ;

return 0 ;

case WM_SIZE:

MoveWindow (hwndEdit, 0, 0, LOWORD (lParam), HIWORD (lParam), TRUE) ;

return 0 ;

case WM_INITMENUPOPUP:

if (lParam == 1)

{

EnableMenuItem ((HMENU) wParam, IDM_EDIT_UNDO,

SendMessage (hwndEdit, EM_CANUNDO, 0, 0) ?

MF_ENABLED : MF_GRAYED) ;

EnableMenuItem ((HMENU) wParam, IDM_EDIT_PASTE,

IsClipboardFormatAvailable (CF_TEXT) ?

MF_ENABLED : MF_GRAYED) ;

iSelect = SendMessage (hwndEdit, EM_GETSEL, 0, 0) ;

if (HIWORD (iSelect) == LOWORD (iSelect))

iEnable = MF_GRAYED ;

else

iEnable = MF_ENABLED ;

EnableMenuItem ((HMENU) wParam, IDM_EDIT_CUT, iEnable) ;

EnableMenuItem ((HMENU) wParam, IDM_EDIT_COPY, iEnable) ;

EnableMenuItem ((HMENU) wParam, IDM_EDIT_CLEAR, iEnable) ;

return 0 ;

}

break ;

case WM_COMMAND:

if (lParam)

{

if (LOWORD (lParam) == ID_EDIT &&

(HIWORD (wParam) == EN_ERRSPACE ||

HIWORD (wParam) == EN_MAXTEXT))

MessageBox (hwnd, TEXT ("Edit control out of space."),

szAppName, MB_OK | MB_ICONSTOP) ;

return 0 ;

}

else switch (LOWORD (wParam))

{

case IDM_FILE_NEW:

case IDM_FILE_OPEN:

case IDM_FILE_SAVE:

case IDM_FILE_SAVE_AS:

case IDM_FILE_PRINT:

MessageBeep (0) ;

return 0 ;

case IDM_APP_EXIT:

SendMessage (hwnd, WM_CLOSE, 0, 0) ;

return 0 ;

case IDM_EDIT_UNDO:

SendMessage (hwndEdit, WM_UNDO, 0, 0) ;

return 0 ;

case IDM_EDIT_CUT:

SendMessage (hwndEdit, WM_CUT, 0, 0) ;

return 0 ;

case IDM_EDIT_COPY:

SendMessage (hwndEdit, WM_COPY, 0, 0) ;

return 0 ;

case IDM_EDIT_PASTE:

SendMessage (hwndEdit, WM_PASTE, 0, 0) ;

return 0 ;

case IDM_EDIT_CLEAR:

SendMessage (hwndEdit, WM_CLEAR, 0, 0) ;

return 0 ;

case IDM_EDIT_SELECT_ALL:

SendMessage (hwndEdit, EM_SETSEL, 0, -1) ;

return 0 ;

case IDM_HELP_HELP:

MessageBox (hwnd, TEXT ("Help not yet implemented!"),

szAppName, MB_OK | MB_ICONEXCLAMATION) ;

return 0 ;

case IDM_APP_ABOUT:

MessageBox (hwnd, TEXT ("POPPAD2 (c) Charles Petzold, 1998"),

szAppName, MB_OK | MB_ICONINFORMATION) ;

return 0 ;

}

break ;

case WM_CLOSE:

if (IDYES == AskConfirmation (hwnd))

DestroyWindow (hwnd) ;

return 0 ;

case WM_QUERYENDSESSION:

if (IDYES == AskConfirmation (hwnd))

return 1 ;

else

return 0 ;

case WM_DESTROY:

PostQuitMessage (0) ;

return 0 ;

}

return DefWindowProc (hwnd, message, wParam, lParam) ;

}

POPPAD2.RC (摘录)

//Microsoft Developer Studio generated resource script.

#include "resource.h"

#include "afxres.h"

/

// Icon

POPPAD2 ICON DISCARDABLE "poppad2.ico"

/

// Menu

POPPAD2 MENU DISCARDABLE

BEGIN

POPUP "&File"

BEGIN

MENUITEM "&New", IDM_FILE_NEW

MENUITEM "&Open...", IDM_FILE_OPEN

MENUITEM "&Save", IDM_FILE_SAVE

MENUITEM "Save &As...", IDM_FILE_SAVE_AS

MENUITEM SEPARATOR

MENUITEM "&Print", IDM_FILE_PRINT

MENUITEM SEPARATOR

MENUITEM "E&xit", IDM_APP_EXIT

END

POPUP "&Edit"

BEGIN

MENUITEM "&Undo\tCtrl+Z", IDM_EDIT_UNDO

MENUITEM SEPARATOR

MENUITEM "Cu&t\tCtrl+X", IDM_EDIT_CUT

MENUITEM "&Copy\tCtrl+C", IDM_EDIT_COPY

MENUITEM "&Paste\tCtrl+V", IDM_EDIT_PASTE

MENUITEM "De&lete\tDel", IDM_EDIT_CLEAR

MENUITEM SEPARATOR

MENUITEM "&Select All", IDM_EDIT_SELECT_ALL

END

POPUP "&Help"

BEGIN

MENUITEM "&Help...", IDM_HELP_HELP

MENUITEM "&About PopPad2...", IDM_APP_ABOUT

END

END

/

// Accelerator

POPPAD2 ACCELERATORS DISCARDABLE

BEGIN

VK_BACK, IDM_EDIT_UNDO, VIRTKEY, ALT, NOINVERT

VK_DELETE, IDM_EDIT_CLEAR, VIRTKEY, NOINVERT

VK_DELETE, IDM_EDIT_CUT, VIRTKEY, SHIFT, NOINVERT

VK_F1, IDM_HELP_HELP, VIRTKEY, NOINVERT

VK_INSERT, IDM_EDIT_COPY, VIRTKEY, CONTROL, NOINVERT

VK_INSERT, IDM_EDIT_PASTE, VIRTKEY, SHIFT, NOINVERT

"^C", IDM_EDIT_COPY, ASCII, NOINVERT

"^V", IDM_EDIT_PASTE, ASCII, NOINVERT

"^X", IDM_EDIT_CUT, ASCII, NOINVERT

"^Z", IDM_EDIT_UNDO, ASCII, NOINVERT

END

RESOURCE.H (摘录)

// Microsoft Developer Studio generated include file.

// Used by POPPAD2.RC

#define IDM_FILE_NEW 40001

#define IDM_FILE_OPEN 40002

#define IDM_FILE_SAVE 40003

#define IDM_FILE_SAVE_AS 40004

#define IDM_FILE_PRINT 40005

#define IDM_APP_EXIT 40006

#define IDM_EDIT_UNDO 40007

#define IDM_EDIT_CUT 40008

#define IDM_EDIT_COPY 40009

#define IDM_EDIT_PASTE 40010

#define IDM_EDIT_CLEAR 40011

#define IDM_EDIT_SELECT_ALL 40012

#define IDM_HELP_HELP 40013

#define IDM_APP_ABOUT 40014

POPPAD2.ICO

POPPAD2.RC资源描述文件包含菜单和快捷键。您将注意到，所有快捷键都表示在制表符(\t)后的「Edit」弹出式菜单的字符串中。