poppad.c

本书介绍了在Microsoft Windows 98、Microsoft Windows NT 4.0和Windows NT 5.0下程序写作的方法。这些程序用C语言编写并使用原始的Windows A

/*---------------------------------------
   POPPAD.C -- Popup Editor
               (c) Charles Petzold, 1998
  ---------------------------------------*/

#include <windows.h>
#include <commdlg.h>
#include "resource.h"

#define EDITID   1
#define UNTITLED TEXT ("(untitled)")

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

     // Functions in POPFILE.C

void PopFileInitialize (HWND) ;
BOOL PopFileOpenDlg    (HWND, PTSTR, PTSTR) ;
BOOL PopFileSaveDlg    (HWND, PTSTR, PTSTR) ;
BOOL PopFileRead       (HWND, PTSTR) ;
BOOL PopFileWrite      (HWND, PTSTR) ;

     // Functions in POPFIND.C

HWND PopFindFindDlg     (HWND) ;
HWND PopFindReplaceDlg  (HWND) ;
BOOL PopFindFindText    (HWND, int *, LPFINDREPLACE) ;
BOOL PopFindReplaceText (HWND, int *, LPFINDREPLACE) ;
BOOL PopFindNextText    (HWND, int *) ;
BOOL PopFindValidFind   (void) ;

     // Functions in POPFONT.C

void PopFontInitialize   (HWND) ;
BOOL PopFontChooseFont   (HWND) ;
void PopFontSetFont      (HWND) ;
void PopFontDeinitialize (void) ;

     // Functions in POPPRNT.C

BOOL PopPrntPrintFile (HINSTANCE, HWND, HWND, PTSTR) ;

     // Global variables

static HWND  hDlgModeless ;
static TCHAR szAppName[] = TEXT ("PopPad") ;

int WINAPI WinMain (HINSTANCE hInstance, HINSTANCE hPrevInstance,
                    PSTR szCmdLine, int iCmdShow)
{
     MSG       msg ;
     HWND      hwnd ;
     HACCEL    hAccel ;
     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, NULL,
                          WS_OVERLAPPEDWINDOW,
                          CW_USEDEFAULT, CW_USEDEFAULT,
                          CW_USEDEFAULT, CW_USEDEFAULT,
                          NULL, NULL, hInstance, szCmdLine) ;
     
     ShowWindow (hwnd, iCmdShow) ;
     UpdateWindow (hwnd) ; 
     
     hAccel = LoadAccelerators (hInstance, szAppName) ;
     
     while (GetMessage (&msg, NULL, 0, 0))
     {
          if (hDlgModeless == NULL || !IsDialogMessage (hDlgModeless, &msg))
          {
               if (!TranslateAccelerator (hwnd, hAccel, &msg))
               {
                    TranslateMessage (&msg) ;
                    DispatchMessage (&msg) ;
               }
          }
     }
     return msg.wParam ;
}

void DoCaption (HWND hwnd, TCHAR * szTitleName)
{
     TCHAR szCaption[64 + MAX_PATH] ;
     
     wsprintf (szCaption, TEXT ("%s - %s"), szAppName,
               szTitleName[0] ? szTitleName : UNTITLED) ;
     
     SetWindowText (hwnd, szCaption) ;
}

void OkMessage (HWND hwnd, TCHAR * szMessage, TCHAR * szTitleName)
{
     TCHAR szBuffer[64 + MAX_PATH] ;
     
     wsprintf (szBuffer, szMessage, szTitleName[0] ? szTitleName : UNTITLED) ;
     
     MessageBox (hwnd, szBuffer, szAppName, MB_OK | MB_ICONEXCLAMATION) ;
}

short AskAboutSave (HWND hwnd, TCHAR * szTitleName)
{
     TCHAR szBuffer[64 + MAX_PATH] ;
     int   iReturn ;
     
     wsprintf (szBuffer, TEXT ("Save current changes in %s?"),
               szTitleName[0] ? szTitleName : UNTITLED) ;
     
     iReturn = MessageBox (hwnd, szBuffer, szAppName,
                           MB_YESNOCANCEL | MB_ICONQUESTION) ;
     
     if (iReturn == IDYES)
          if (!SendMessage (hwnd, WM_COMMAND, IDM_FILE_SAVE, 0))
               iReturn = IDCANCEL ;
          
     return iReturn ;
}

LRESULT CALLBACK WndProc (HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)
{
     static BOOL      bNeedSave = FALSE ;
     static HINSTANCE hInst ;
     static HWND      hwndEdit ;
     static int       iOffset ;
     static TCHAR     szFileName[MAX_PATH], szTitleName[MAX_PATH] ;
     static UINT      messageFindReplace ;
     int              iSelBeg, iSelEnd, iEnable ;
     LPFINDREPLACE    pfr ;
     
     switch (message)
     {
     case WM_CREATE:
          hInst = ((LPCREATESTRUCT) lParam) -> hInstance ;
          
               // Create the edit control child window
          
          hwndEdit = CreateWindow (TEXT ("edit"), NULL,
                              WS_CHILD | WS_VISIBLE | WS_HSCROLL | WS_VSCROLL |
                              WS_BORDER | ES_LEFT | ES_MULTILINE |
                              ES_NOHIDESEL | ES_AUTOHSCROLL | ES_AUTOVSCROLL,
                              0, 0, 0, 0,
                              hwnd, (HMENU) EDITID, hInst, NULL) ;
          
          SendMessage (hwndEdit, EM_LIMITTEXT, 32000, 0L) ;
          
               // Initialize common dialog box stuff
          
          PopFileInitialize (hwnd) ;
          PopFontInitialize (hwndEdit) ;
          
          messageFindReplace = RegisterWindowMessage (FINDMSGSTRING) ;
          
          DoCaption (hwnd, szTitleName) ;
          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:
          switch (lParam)
          {
          case 1:             // Edit menu
               
                    // Enable Undo if edit control can do it
               
               EnableMenuItem ((HMENU) wParam, IDM_EDIT_UNDO,
                    SendMessage (hwndEdit, EM_CANUNDO, 0, 0L) ?
                                             MF_ENABLED : MF_GRAYED) ;
               
                    // Enable Paste if text is in the clipboard
               
               EnableMenuItem ((HMENU) wParam, IDM_EDIT_PASTE,
                    IsClipboardFormatAvailable (CF_TEXT) ?
                                             MF_ENABLED : MF_GRAYED) ;
               
                    // Enable Cut, Copy, and Del if text is selected
               
               SendMessage (hwndEdit, EM_GETSEL, (WPARAM) &iSelBeg,
                                                 (LPARAM) &iSelEnd) ;
               
               iEnable = iSelBeg != iSelEnd ? MF_ENABLED : MF_GRAYED ;
               
               EnableMenuItem ((HMENU) wParam, IDM_EDIT_CUT,   iEnable) ;
               EnableMenuItem ((HMENU) wParam, IDM_EDIT_COPY,  iEnable) ;
               EnableMenuItem ((HMENU) wParam, IDM_EDIT_CLEAR, iEnable) ;
               break ;
               
          case 2:             // Search menu
               
               // Enable Find, Next, and Replace if modeless
               //   dialogs are not already active
               
               iEnable = hDlgModeless == NULL ?
                              MF_ENABLED : MF_GRAYED ;
               
               EnableMenuItem ((HMENU) wParam, IDM_SEARCH_FIND,    iEnable) ;
               EnableMenuItem ((HMENU) wParam, IDM_SEARCH_NEXT,    iEnable) ;
               EnableMenuItem ((HMENU) wParam, IDM_SEARCH_REPLACE, iEnable) ;
               break ;
          }
          return 0 ;
     
     case WM_COMMAND:
               // Messages from edit control
          
          if (lParam && LOWORD (wParam) == EDITID)