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Windows 95 API Bible
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Windows 95 API Bible 3 Disc Set.iso
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Win32 API Bible Book 1 of 3
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CHAPTE11
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GLOBALOC.C
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C/C++ Source or Header
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1996-01-29
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8KB
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263 lines
#include <windows.h>
#include "GlobAloc.h"
#if defined (WIN32)
#define IS_WIN32 TRUE
#else
#define IS_WIN32 FALSE
#endif
#define IS_NT IS_WIN32 && (BOOL)(GetVersion() < 0x80000000)
#define IS_WIN32S IS_WIN32 && (BOOL)(!(IS_NT) && (LOBYTE(LOWORD(GetVersion()))<4))
#define IS_WIN95 (BOOL)(!(IS_NT) && !(IS_WIN32S)) && IS_WIN32
HINSTANCE hInst; // current instance
LPCTSTR lpszAppName = "MyApp";
LPCTSTR lpszTitle = "My Application";
BOOL RegisterWin95( CONST WNDCLASS* lpwc );
int APIENTRY WinMain( HINSTANCE hInstance, HINSTANCE hPrevInstance,
LPTSTR lpCmdLine, int nCmdShow)
{
MSG msg;
HWND hWnd;
WNDCLASS wc;
// Register the main application window class.
//............................................
wc.style = CS_HREDRAW | CS_VREDRAW;
wc.lpfnWndProc = (WNDPROC)WndProc;
wc.cbClsExtra = 0;
wc.cbWndExtra = 0;
wc.hInstance = hInstance;
wc.hIcon = LoadIcon( hInstance, lpszAppName );
wc.hCursor = LoadCursor(NULL, IDC_ARROW);
wc.hbrBackground = (HBRUSH)(COLOR_WINDOW+1);
wc.lpszMenuName = lpszAppName;
wc.lpszClassName = lpszAppName;
if ( IS_WIN95 )
{
if ( !RegisterWin95( &wc ) )
return( FALSE );
}
else if ( !RegisterClass( &wc ) )
return( FALSE );
hInst = hInstance;
// Create the main application window.
//....................................
hWnd = CreateWindow( lpszAppName,
lpszTitle,
WS_OVERLAPPEDWINDOW,
CW_USEDEFAULT, 0,
CW_USEDEFAULT, 0,
NULL,
NULL,
hInstance,
NULL
);
if ( !hWnd )
return( FALSE );
ShowWindow( hWnd, nCmdShow );
UpdateWindow( hWnd );
while( GetMessage( &msg, NULL, 0, 0) )
{
TranslateMessage( &msg );
DispatchMessage( &msg );
}
return( msg.wParam );
}
BOOL RegisterWin95( CONST WNDCLASS* lpwc )
{
WNDCLASSEX wcex;
wcex.style = lpwc->style;
wcex.lpfnWndProc = lpwc->lpfnWndProc;
wcex.cbClsExtra = lpwc->cbClsExtra;
wcex.cbWndExtra = lpwc->cbWndExtra;
wcex.hInstance = lpwc->hInstance;
wcex.hIcon = lpwc->hIcon;
wcex.hCursor = lpwc->hCursor;
wcex.hbrBackground = lpwc->hbrBackground;
wcex.lpszMenuName = lpwc->lpszMenuName;
wcex.lpszClassName = lpwc->lpszClassName;
// Added elements for Windows 95.
//...............................
wcex.cbSize = sizeof(WNDCLASSEX);
wcex.hIconSm = LoadImage(wcex.hInstance, lpwc->lpszClassName,
IMAGE_ICON, 16, 16,
LR_DEFAULTCOLOR );
return RegisterClassEx( &wcex );
}
LRESULT CALLBACK WndProc( HWND hWnd, UINT uMsg, WPARAM wParam, LPARAM lParam )
{
static PAINTSTRUCT ps;
static char szBuf[128];
static LPTSTR pMem = NULL;
switch( uMsg )
{
case WM_CREATE :
{
// Allocate Initial block of memory and
// Initialize it with the alphabet in uppercase.
//..............................................
HGLOBAL hMem = GlobalAlloc( GHND, 27 );
LPTSTR pCur;
if ( hMem && (pMem = (LPTSTR)GlobalLock( hMem )) != NULL )
{
int i;
pCur = pMem;
for( i=0; i<26; i++ )
*pCur++ = 'A'+i;
*pCur = 0;
}
else
{
MessageBox( hWnd, "Could not allocate memory",
"Memory Error",
MB_OK | MB_ICONSTOP );
DestroyWindow( hWnd );
}
}
break;
case WM_PAINT :
// Paint the status of the memory.
//................................
BeginPaint( hWnd, &ps );
if( pMem )
{
// Retrieve the handle for
// the memory and memory status.
//..............................
HGLOBAL hMem = GlobalHandle( pMem );
DWORD dwSize = GlobalSize( hMem );
UINT uFlags = GlobalFlags( hMem );
TextOut( ps.hdc, 10, 10, szBuf, wsprintf( szBuf,
"The memory block is %ld bytes in size.", dwSize ) );
TextOut( ps.hdc, 10, 30, szBuf, wsprintf( szBuf,
"Contains: %s", pMem ) );
TextOut( ps.hdc, 10, 50, szBuf, wsprintf( szBuf,
"Flags: Discardable=%d, Lock Count=%d",
uFlags & GMEM_DISCARDABLE,
uFlags & GMEM_LOCKCOUNT ) );
}
EndPaint( hWnd, &ps );
break;
case WM_COMMAND :
switch( LOWORD( wParam ) )
{
case IDM_TEST :
// ReAllocate memory and add the
// lowercase alphabet to the memory.
//..................................
if ( pMem )
{
HGLOBAL hMem = GlobalHandle( pMem );
GlobalUnlock( hMem );
pMem = NULL;
hMem = GlobalReAlloc( hMem, (26*2)+1,
GMEM_MOVEABLE );
if ( hMem )
{
LPTSTR pCur;
int i;
pMem = (LPTSTR)GlobalLock( hMem );
// Skip the old values.
//.....................
pCur = pMem+26;
// Set the new values.
//....................
for( i=0; i<26; i++ )
*pCur++ = 'a'+i;
*pCur = 0;
}
else
MessageBox( hWnd, "Could not allocate memory",
"Memory Error",
MB_OK | MB_ICONSTOP );
InvalidateRect( hWnd, NULL, TRUE );
}
break;
case IDM_ABOUT :
DialogBox( hInst, "AboutBox", hWnd, (DLGPROC)About );
break;
case IDM_EXIT :
DestroyWindow( hWnd );
break;
}
break;
case WM_DESTROY :
if ( pMem )
{
HGLOBAL hMem = GlobalHandle( pMem );
GlobalUnlock( hMem );
GlobalFree( hMem );
}
PostQuitMessage(0);
break;
default :
return( DefWindowProc( hWnd, uMsg, wParam, lParam ) );
}
return( 0L );
}
LRESULT CALLBACK About( HWND hDlg,
UINT message,
WPARAM wParam,
LPARAM lParam)
{
switch (message)
{
case WM_INITDIALOG:
return (TRUE);
case WM_COMMAND:
if ( LOWORD(wParam) == IDOK
|| LOWORD(wParam) == IDCANCEL)
{
EndDialog(hDlg, TRUE);
return (TRUE);
}
break;
}
return (FALSE);
}