Petzold's HEAD.C

This is a discussion on Petzold's HEAD.C within the Windows Programming forums, part of the Platform Specific Boards category; I'm trying to compile the following code on my Athlon PC using the Dev C++ compiler. I get a passing ...

  1. #1
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    May 2003
    Posts
    7

    Petzold's HEAD.C

    I'm trying to compile the following code on my Athlon PC using the Dev C++ compiler. I get a passing int as argument 4 error in lin 179 and a passing unsigned char error in line 192. Any suggestions are appreciated.

    Code:
    /*---------------------------------------------
       HEAD.C -- Displays beginning (head) of file
                 (c) Charles Petzold, 1998
      ---------------------------------------------*/
    
    #include <windows.h>
    
    #define ID_LIST     1
    #define ID_TEXT     2
    
    #define MAXREAD     8192
    #define DIRATTR     (DDL_READWRITE | DDL_READONLY | DDL_HIDDEN | DDL_SYSTEM | \
                         DDL_DIRECTORY | DDL_ARCHIVE  | DDL_DRIVES)
    #define DTFLAGS     (DT_WORDBREAK | DT_EXPANDTABS | DT_NOCLIP | DT_NOPREFIX)
    
    LRESULT CALLBACK WndProc  (HWND, UINT, WPARAM, LPARAM) ;
    LRESULT CALLBACK ListProc (HWND, UINT, WPARAM, LPARAM) ;
    
    WNDPROC OldList ;
    
    int WINAPI WinMain (HINSTANCE hInstance, HINSTANCE hPrevInstance,
                        PSTR szCmdLine, int iCmdShow)
    {
         static TCHAR szAppName[] = TEXT ("head") ;
         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 (NULL, IDI_APPLICATION) ;
         wndclass.hCursor       = LoadCursor (NULL, IDC_ARROW) ;
         wndclass.hbrBackground = (HBRUSH) (COLOR_BTNFACE + 1) ;
         wndclass.lpszMenuName  = NULL ;
         wndclass.lpszClassName = szAppName ;
         
         if (!RegisterClass (&wndclass))
         {
              MessageBox (NULL, TEXT ("This program requires Windows NT!"),
                          szAppName, MB_ICONERROR) ;
              return 0 ;
         }
         
         hwnd = CreateWindow (szAppName, TEXT ("head"),
                              WS_OVERLAPPEDWINDOW | WS_CLIPCHILDREN,
                              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 ;
    }
    
    LRESULT CALLBACK WndProc (HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)
    {
         static BOOL     bValidFile ;
         static BYTE     buffer[MAXREAD] ;
         static HWND     hwndList, hwndText ;
         static RECT     rect ;
         static TCHAR    szFile[MAX_PATH + 1] ;
         HANDLE          hFile ;
         HDC             hdc ;
         int             i, cxChar, cyChar ;
         PAINTSTRUCT     ps ;
         TCHAR           szBuffer[MAX_PATH + 1] ;
         
         switch (message)
         {
         case WM_CREATE :
              cxChar = LOWORD (GetDialogBaseUnits ()) ;
              cyChar = HIWORD (GetDialogBaseUnits ()) ;
              
              rect.left = 20 * cxChar ;
              rect.top  =  3 * cyChar ;
              
              hwndList = CreateWindow (TEXT ("listbox"), NULL,
                                  WS_CHILDWINDOW | WS_VISIBLE | LBS_STANDARD,
                                  cxChar, cyChar * 3,
                                  cxChar * 13 + GetSystemMetrics (SM_CXVSCROLL),
                                  cyChar * 10,
                                  hwnd, (HMENU) ID_LIST,
                                  (HINSTANCE) GetWindowLong (hwnd, GWL_HINSTANCE),
                                  NULL) ;
    
              GetCurrentDirectory (MAX_PATH + 1, szBuffer) ;
              
              hwndText = CreateWindow (TEXT ("static"), szBuffer,
                                  WS_CHILDWINDOW | WS_VISIBLE | SS_LEFT,
                                  cxChar, cyChar, cxChar * MAX_PATH, cyChar,
                                  hwnd, (HMENU) ID_TEXT,
                                  (HINSTANCE) GetWindowLong (hwnd, GWL_HINSTANCE),
                                  NULL) ;
              
              OldList = (WNDPROC) SetWindowLong (hwndList, GWL_WNDPROC,
                                                   (LPARAM) ListProc) ;
              
              SendMessage (hwndList, LB_DIR, DIRATTR, (LPARAM) TEXT ("*.*")) ;
              return 0 ;
              
         case WM_SIZE :
              rect.right  = LOWORD (lParam) ;
              rect.bottom = HIWORD (lParam) ;
              return 0 ;
              
         case WM_SETFOCUS :
              SetFocus (hwndList) ;
              return 0 ;
              
         case WM_COMMAND :
              if (LOWORD (wParam) == ID_LIST && HIWORD (wParam) == LBN_DBLCLK)
              {
                   if (LB_ERR == (i = SendMessage (hwndList, LB_GETCURSEL, 0, 0)))
                        break ;
                   
                   SendMessage (hwndList, LB_GETTEXT, i, (LPARAM) szBuffer) ;
                   
                   if (INVALID_HANDLE_VALUE != (hFile = CreateFile (szBuffer, 
                             GENERIC_READ, FILE_SHARE_READ, NULL, 
                             OPEN_EXISTING, 0, NULL)))
    
                   {
                        CloseHandle (hFile) ;
                        bValidFile = TRUE ;
                        lstrcpy (szFile, szBuffer) ;
                        GetCurrentDirectory (MAX_PATH + 1, szBuffer) ;
    
                        if (szBuffer [lstrlen (szBuffer) - 1] != '\\')
                             lstrcat (szBuffer, TEXT ("\\")) ;
                        SetWindowText (hwndText, lstrcat (szBuffer, szFile)) ;
                   }
                   else
                   {
                        bValidFile = FALSE ;
                        szBuffer [lstrlen (szBuffer) - 1] = '\0' ;
    
                             // If setting the directory doesn't work, maybe it's
                             // a drive change, so try that.
    
                        if (!SetCurrentDirectory (szBuffer + 1))
                        {
                             szBuffer [3] = ':' ;
                             szBuffer [4] = '\0' ;
                             SetCurrentDirectory (szBuffer + 2) ;
                        }
    
                             // Get the new directory name and fill the list box.
    
                        GetCurrentDirectory (MAX_PATH + 1, szBuffer) ;
                        SetWindowText (hwndText, szBuffer) ;
                        SendMessage (hwndList, LB_RESETCONTENT, 0, 0) ;
                        SendMessage (hwndList, LB_DIR, DIRATTR, 
                                               (LPARAM) TEXT ("*.*")) ;
                   }
                   InvalidateRect (hwnd, NULL, TRUE) ;
              }
              return 0 ;
              
         case WM_PAINT :
              if (!bValidFile)
                   break ;
    
              if (INVALID_HANDLE_VALUE == (hFile = CreateFile (szFile, GENERIC_READ, 
                        FILE_SHARE_READ, NULL, OPEN_EXISTING, 0, NULL)))
              {
                   bValidFile = FALSE ;
                   break ;
              }
    
              ReadFile (hFile, buffer, MAXREAD, &i, NULL) ;
              CloseHandle (hFile) ;
    
                   // i now equals the number of bytes in buffer.
                   // Commence getting a device context for displaying text.
    
              hdc = BeginPaint (hwnd, &ps) ;
              SelectObject (hdc, GetStockObject (SYSTEM_FIXED_FONT)) ;
              SetTextColor (hdc, GetSysColor (COLOR_BTNTEXT)) ;
              SetBkColor   (hdc, GetSysColor (COLOR_BTNFACE)) ;
    
                   // Assume the file is ASCII
    
              DrawTextA (hdc, buffer, i, &rect, DTFLAGS) ;
    
              EndPaint (hwnd, &ps) ;
              return 0 ;
              
         case WM_DESTROY :
              PostQuitMessage (0) ;
              return 0 ;
         }
         return DefWindowProc (hwnd, message, wParam, lParam) ;
    }
         
    LRESULT CALLBACK ListProc (HWND hwnd, UINT message, 
                               WPARAM wParam, LPARAM lParam)
    {
         if (message == WM_KEYDOWN && wParam == VK_RETURN)
              SendMessage (GetParent (hwnd), WM_COMMAND, 
                           MAKELONG (1, LBN_DBLCLK), (LPARAM) hwnd) ;
              
         return CallWindowProc (OldList, hwnd, message, wParam, lParam) ;
    }

  2. #2
    Registered User Codeplug's Avatar
    Join Date
    Mar 2003
    Posts
    4,630
    Just post the lines in question next time

    >> ReadFile (hFile, buffer, MAXREAD, (LPDWORD)&i, NULL);
    >> DrawTextA (hdc, (LPCSTR)buffer, i, &rect, DTFLAGS);

    The compiler is basically saying "I'm expecting type A, you're giving me type B, and I can't/won't convert between the two".
    In this case the compiler didn't like converting between pointers to signed and unsigned values - so you make it like with a cast.

    gg

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