campo-sirio/al/examples/ex20win.c

/*
 * EX20WIN.C
 *
 *  C/Windows Example program for ArchiveLib 2.0
 *
 *  Copyright (c) Greenleaf Software, Inc. 1994 - 1996
 *  All Rights Reserved
 *
 * MEMBERS/FUNCTIONS DEMONSTRATED
 *
 *  ALStorageGetStrucFromTimeDate()
 *  ALStorageGetUnixTime()
 *
 * DESCRIPTION
 *
 *  This program demonstrates some of the timedate functions in
 *  ALStorage.  It is a "read-only" program that doesn't modify
 *  any of the files it messes with.  It just lets you double click
 *  on a file, then see the time date stamps for that file.
 *
 *  This program is functionally equivalent to EX20WIN.CPP.  The C version
 *  uses the translation layer functions to get the job done, but if
 *  you put them side by side, you won't see too much difference.
 *
 * REVISION HISTORY
 *
 *  February 1, 1996  2.0A  : Second release
 *
 */

#define STRICT
#include <windows.h>
#include <stdarg.h>
#include <string.h>

#include "al.h"
#include "ex20win.h"

HINSTANCE hInstance;
HWND hDlgMain;

void SizeFramingWindow( HWND hDlg );
void ReadDir( HWND hDlg );

/*
 * When the user double clicks on a filename, they call this routine,
 * which creates an object to go with the file, then displays the
 * time stamps for the file, in various formats.
 */

void UpdateFileStats( HWND hDlg )
{
    char buf[ 128 ];
    int i;
    int len;
    long stamp;
    hALStorage file;
    struct tm tblock;
    char *p;

    i = (int) SendDlgItemMessage( hDlg, AL_INPUT_FILES, LB_GETCURSEL, 0, 0 );
    if ( i == LB_ERR )
        return;
    len = (int) SendDlgItemMessage( hDlg, AL_INPUT_FILES, LB_GETTEXTLEN, i, 0 );
    if ( i == LB_ERR || len < 0 || len > 127 )
        return;
    SendDlgItemMessage( hDlg, AL_INPUT_FILES, LB_GETTEXT, i, (LPARAM)(LPSTR) buf );
    SetDlgItemText( hDlg, AL_FILE_NAME, buf );
    file = newALFile( buf );
    ALStorageOpen( file );
    ALStorageClose( file );
    if ( ALStorageGetStatusCode( file ) < AL_SUCCESS ) {
        SetDlgItemText( hDlg, AL_TIME_STAMP, "<Error>" );
        return;
    }
    wsprintf( buf, "%ld", stamp = ALStorageGetUnixTime( file ) );
    SetDlgItemText( hDlg, AL_TIME_STAMP, buf );
    SetDlgItemInt( hDlg, AL_YEARS, (int)(stamp / 365L / 24L / 60L / 60L), 0 );
    ALStorageGetStrucFromTimeDate( file, &tblock );
    p = asctime( &tblock );
    strcpy( buf, p );
    buf[ 24 ] = '\0';
    SetDlgItemText( hDlg, AL_DATE_AND_TIME, buf );
    deleteALStorage( file );
}

/*
 * In this program, we have a main window, but it is just a dummy framing
 * window for the dialog box.  This dialog box proc is where all the action
 * takes place.  It handles input keystrokes and button presses from the
 * dialog.
 */

BOOL AL_EXPORT CALLBACK MainDialogProc( HWND hDlg,
                                        UINT message,
                                        WPARAM wParam,
                                        LPARAM lParam )
{
    switch ( message ) {
        case WM_INITDIALOG :
            SizeFramingWindow( hDlg );
            SetWindowText( hDlg, "Windows Example 20" );
            ReadDir( hDlg );
            return( TRUE );

        case WM_COMMAND :
            switch ( LOWORD( wParam ) ) {
/*
 * The only message of note here is the the double click on a file name
 * in the input file name list box.
 */
                case AL_INPUT_FILES : {
#if defined( AL_FLAT_MODEL )
                    AL_UNUSED_PARAMETER( lParam );
                    switch ( HIWORD( wParam ) ) {
#else
                    switch ( HIWORD( lParam ) ) {
#endif
                            case LBN_DBLCLK :
                                UpdateFileStats( hDlg );
                                break;
                        }
                    }
                    break;
                case IDOK : /*User has pressed enter */
                    break;
                case AL_EXIT :
                case WM_QUIT :
                case WM_DESTROY :
                    PostMessage( GetParent( hDlg ),WM_DESTROY, 0, 0 );
                    DestroyWindow( hDlgMain );
                    hDlgMain = 0;
                    return TRUE;
            }
            break;
    }
    return FALSE;
}

/*
 * This is a straightforward expansion of wildcards to fill a directory
 * listing box.  The same piece of code used in a zillion other examples.
 */

void ReadDir( HWND hDlg )
{
    char AL_DLL_FAR *p;
    hALExpander files;

    SendDlgItemMessage( hDlg, AL_INPUT_FILES, LB_RESETCONTENT, 0, 0 );
    files = newALExpander( "*.*", 0, AL_LOWER );
    while ( ( p = ALExpanderGetNextFile( files ) ) != 0 )
        SendDlgItemMessage( hDlg,
                            AL_INPUT_FILES,
                            LB_ADDSTRING,
                            0,
                            (LPARAM)( (LPSTR) p ) );

}

/*
 * The about box.
 */

BOOL AL_EXPORT CALLBACK
AboutDialogProc( HWND hDlg, UINT message, WPARAM wParam, LPARAM lParam )
{
    RECT rc;

    AL_UNUSED_PARAMETER( lParam );
    switch ( message ) {
        case WM_INITDIALOG :
            GetWindowRect( hDlg, &rc );
            SetWindowPos( hDlg,
                          0,
                          (short int) ((GetSystemMetrics(SM_CXSCREEN) - (rc.right - rc.left)) / 2),
                          (short int) ((GetSystemMetrics(SM_CYSCREEN) - (rc.bottom - rc.top)) / 2),
                          0, 0, SWP_NOSIZE | SWP_NOACTIVATE);
            break;
        case WM_COMMAND :
            switch ( wParam ) {
                case IDOK :
                case WM_QUIT :
                case WM_DESTROY :
                    EndDialog( hDlg, TRUE );
                    return TRUE;
            }
            break;
    }
    return FALSE;
}

/*
 * The main window is nothing more than a shell that exists to manage
 * the dialog box, take menu commands, and process accelerator keys.
 */

LONG AL_EXPORT CALLBACK MainWndProc( HWND hWnd,
                                     UINT message,
                                     WPARAM wParam,
                                     LPARAM lParam )
{
    switch ( message ) {
        case WM_COMMAND:
            switch( wParam ) {
                case AL_EXIT :
                    PostQuitMessage( 0 );
            }
            break;
        case WM_SETFOCUS:
            SetFocus( hDlgMain ); /* insure that the Dialog Box has the focus */
            break;
        case WM_DESTROY:
            PostQuitMessage( 0 );
            break;
    }
    return DefWindowProc( hWnd, message, wParam, lParam );
}

/*
 * WinMain first registers our class.  It then creates the dialog, and
 * starts up the message pump.
 */

int PASCAL WinMain( HINSTANCE instance,
                          HINSTANCE previous_instance,
                          LPSTR lpstr,
                          int nCmdShow )
{
    HWND hWnd;
    FARPROC lpfn;
    MSG msg;
    HACCEL hAccel;
    HWND hWndAccel;
    AL_UNUSED_PARAMETER( lpstr );

    hInstance = instance;
    if ( previous_instance == 0 ) {
        WNDCLASS wc;
        wc.style         = 0;
        wc.lpfnWndProc   = (WNDPROC) MainWndProc;
        wc.cbClsExtra    = 0;
        wc.cbWndExtra    = 0;
        wc.hInstance     = instance;
        wc.hIcon         = LoadIcon( hInstance, "ALIcon" );
        wc.hCursor       = LoadCursor( 0, IDC_ARROW );
        wc.hbrBackground = (HBRUSH) GetStockObject( WHITE_BRUSH );
        wc.lpszMenuName  = "ALMenu";
        wc.lpszClassName = "ALClass";
        if ( !RegisterClass( &wc ) )
            return FALSE;
    }
    hWnd = CreateWindow( "ALClass",
                         "ArchiveLib Example Program",
                         WS_OVERLAPPED | WS_CAPTION | WS_MINIMIZEBOX | WS_SYSMENU,
                         CW_USEDEFAULT,
                         0,
                         0,
                         0,
                         0,
                         0,
                         hInstance,
                         NULL );

    lpfn = MakeProcInstance( (FARPROC) MainDialogProc, hInstance );
    hDlgMain = CreateDialog( hInstance, "ALMainDialog", hWnd, (DLGPROC) lpfn );
    ShowWindow( hWnd, (short) nCmdShow );
    ShowWindow( hDlgMain, SW_SHOW );
    hAccel = LoadAccelerators( hInstance, "ALAccelerator" );
    while ( GetMessage ( &msg, 0, 0, 0 ) ) {
        hWndAccel = GetActiveWindow();
        if ( !( hWndAccel && TranslateAccelerator( hWndAccel, hAccel, &msg ) ) )
        {
            if ( hDlgMain == NULL || !IsDialogMessage( hDlgMain,&msg ) ) {
                TranslateMessage( &msg );
                DispatchMessage( &msg );
            }
        }
    }
    return (msg.wParam);
}

/*
 * I need this routine for one purpose only.  After the dialog is loaded,
 * it calls this routine, which adjusts the size of the framing window to
 * fit exactly around the dialog box.  It also moves it to the center of
 * the screen.
 */

void SizeFramingWindow( HWND hDlg )
{
    RECT rect;
    int x;
    int y;

    GetWindowRect( hDlg, &rect );
    y = GetSystemMetrics( SM_CYSCREEN );
    y -= ( rect.bottom - rect.top );
    y -= GetSystemMetrics( SM_CYMENU ) + GetSystemMetrics( SM_CYCAPTION );
    y /= 2;
    x = GetSystemMetrics( SM_CXSCREEN );
    x -= rect.right - rect.left;
    x /= 2;
    SetWindowPos( GetParent( hDlg ), 0, (short) x, (short) y,
                  (short int) ( rect.right-rect.left ),
                  (short int) ( rect.bottom-rect.top +
                  GetSystemMetrics( SM_CYMENU ) +
                  GetSystemMetrics( SM_CYCAPTION ) ),
                  SWP_NOZORDER );
}