campo-sirio/al/examples/ex19win.cpp

//
// EX19WIN.CPP
//
//  C++/Windows Example program for ArchiveLib 2.0
//
//  Copyright (c) Greenleaf Software, Inc. 1994 - 1996
//  All Rights Reserved
//
// MEMBERS/FUNCTIONS DEMONSTRATED
//
//  ALName::GetName()
//  ALName::GetOldName()
//  ALName::GetSafeOldName()
//
// DESCRIPTION
//
// This program demonstrates some of the functions in the ALName
// class.  It lets you create an ALName object, rename it, and
// delete it.  After these operations, it prints out some key
// states on the ALName object.
//
// REVISION HISTORY
//
//  February 1, 1996  2.0A  : Second release
//
//

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

#include "al.h"
#include "ex19win.h"

HINSTANCE hInstance;
HWND hDlgMain;
ALName *name = 0;

void SizeFramingWindow( HWND hDlg );

//
// After any of the operations on the ALName object, this routine is called
// to update the stats in the dialog box.
//
void Update( HWND hDlg )
{
    char buf[ 21 ];
    const char AL_DLL_FAR *p;

    int good_tag = name->GoodTag();
    wsprintf( buf, "%d", good_tag );
    SetDlgItemText( hDlg, AL_GOOD_TAG, buf );
    if ( good_tag ) {
        SetDlgItemText( hDlg, AL_NAME, name->GetName() );
        p = name->GetOldName();
        if ( !p )
            p = "<Null pointer>";
        SetDlgItemText( hDlg, AL_OLD_NAME, p );
        p = name->GetSafeOldName();
        if ( p[ 0 ] == '\0' )
            p = "Empty string";
        SetDlgItemText( hDlg, AL_SAFE_OLD_NAME, p );
    }
#ifdef _DEBUG
    else {
        SetDlgItemText( hDlg, AL_NAME, "<Invalid object>" );
        SetDlgItemText( hDlg, AL_OLD_NAME, "<Invalid object>" );
        SetDlgItemText( hDlg, AL_SAFE_OLD_NAME, "<Invalid object>" );
    }
#endif
}

//
// In this program, we have a main window, but it is just a dummy framing
// windows 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 )
{
    switch ( message ) {
//
// This sets the title bar and creates the initial copy of the ALName object.
//
        case WM_INITDIALOG :
            SizeFramingWindow( hDlg );
            SetWindowText( hDlg, "Windows Example 19" );
            name = new ALName( "Test name" );
            Update( hDlg );
            return( TRUE );
//
// The button presses form the dialog are passed into this routine as
// WM_COMMAND messages.
//
        case WM_COMMAND :
            switch ( wParam ) {
                case AL_CREATE :
                    name = new ALName( "Test name" );
                    Update( hDlg );
                    break;
                case AL_DELETE :
                    delete name;
                    Update( hDlg );
                    break;
                case AL_RENAME :
                    *name = "New name";
                    Update( hDlg );
                    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;
}

//
// The about box.
//
BOOL AL_EXPORT CALLBACK
AboutDialogProc( HWND hDlg, UINT message, WPARAM wParam, LPARAM )
{
    switch ( message ) {
        case WM_INITDIALOG :
            RECT rc;
            GetWindowRect( hDlg, &rc );
            SetWindowPos( hDlg,
                          NULL,
                          (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 registers our class.  It then creates the dialog, and starts the
// message pump.
//
int PASCAL WinMain( HINSTANCE instance,
                    HINSTANCE previous_instance,
                    LPSTR,
                    int nCmdShow )
{
    hInstance = instance;
    if ( previous_instance == 0 ) {
        WNDCLASS wc;
        wc.style         = 0;
        wc.lpfnWndProc   = MainWndProc;
        wc.cbClsExtra    = 0;
        wc.cbWndExtra    = 0;
        wc.hInstance     = instance;
        wc.hIcon         = LoadIcon( hInstance, "ALIcon" );
        wc.hCursor       = LoadCursor(NULL,IDC_ARROW);
        wc.hbrBackground = (HBRUSH) GetStockObject( WHITE_BRUSH );
        wc.lpszMenuName  = "ALMenu";
        wc.lpszClassName = "ALClass";
        if ( !RegisterClass( &wc ) )
            return FALSE;
    }
    HWND hWnd = CreateWindow( "ALClass",
                              "ArchiveLib Example Program",
                              WS_OVERLAPPED | WS_CAPTION | WS_MINIMIZEBOX | WS_SYSMENU,
                              CW_USEDEFAULT,
                              0,
                              0,
                              0,
                              NULL,
                              NULL,
                              hInstance,
                              NULL );

    FARPROC lpfn = MakeProcInstance( (FARPROC) MainDialogProc, hInstance );
    hDlgMain = CreateDialog( hInstance, "ALMainDialog", hWnd, (DLGPROC) lpfn );
    ShowWindow( hWnd, (short) nCmdShow );
    ShowWindow( hDlgMain, SW_SHOW );
    MSG msg;
    while ( GetMessage ( &msg, NULL, NULL, NULL ) ) {
        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;

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