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Windows 95 API Bible
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chapte10
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keepstr.c
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C/C++ Source or Header
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1996-03-06
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7KB
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239 lines
#include <windows.h>
#include "keepstr.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
HWND hWindow = NULL;
LPCTSTR lpszAppName = "MyApp";
LPCTSTR lpszTitle = "DdeKeepStringHandle()";
BOOL RegisterWin95( CONST WNDCLASS* lpwc );
int APIENTRY WinMain( HINSTANCE hInstance, HINSTANCE hPrevInstance,
LPTSTR lpCmdLine, int nCmdShow)
{
MSG msg;
HWND hWnd;
WNDCLASS wc;
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;
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 );
}
HDDEDATA CALLBACK DdemlCallback( UINT uType,
UINT uFmt,
HCONV hconv,
HSZ hsz1,
HSZ hsz2,
HDDEDATA hdata,
DWORD dwData1,
DWORD dwData2 );
DWORD ddeInst = 0;
HSZ hszBase = NULL;
HSZ hszService = NULL;
LRESULT CALLBACK WndProc( HWND hWnd, UINT uMsg, WPARAM wParam, LPARAM lParam )
{
static char szBuf[128];
static char szBase[40];
static char szService[40];
static PAINTSTRUCT ps;
switch( uMsg )
{
case WM_CREATE :
// Initialize DDEML.
//..................
if ( DdeInitialize( &ddeInst, DdemlCallback,
APPCMD_CLIENTONLY, 0 ) != DMLERR_NO_ERROR )
{
MessageBox( hWnd, "Could not initialize DDEML.",
NULL, MB_OK | MB_ICONSTOP );
return( -1 );
}
hWindow = hWnd;
break;
case WM_COMMAND :
switch( LOWORD( wParam ) )
{
case IDM_ABOUT :
DialogBox( hInst, "AboutBox", hWnd, (DLGPROC)About );
break;
case IDM_EXIT :
DestroyWindow( hWnd );
break;
}
break;
case WM_USER :
InvalidateRect( hWnd, NULL, TRUE );
break;
case WM_PAINT :
BeginPaint( hWnd, &ps );
if ( hszBase && hszService )
{
DdeQueryString( ddeInst, hszBase, szBase,
sizeof( szBase ), CP_WINANSI );
DdeQueryString( ddeInst, hszService, szService,
sizeof( szService ), CP_WINANSI );
wsprintf( szBuf, "DDE Base = %s, Service = %s",
(LPTSTR)szBase, (LPTSTR)szService );
TextOut( ps.hdc, 5, 5, szBuf, strlen( szBuf ) );
DdeFreeStringHandle( ddeInst, hszBase );
DdeFreeStringHandle( ddeInst, hszService );
}
EndPaint( hWnd, &ps );
break;
case WM_DESTROY :
DdeUninitialize( ddeInst );
PostQuitMessage(0);
break;
default :
return( DefWindowProc( hWnd, uMsg, wParam, lParam ) );
}
return( 0L );
}
HDDEDATA CALLBACK DdemlCallback( UINT uType,
UINT uFmt,
HCONV hconv,
HSZ hsz1,
HSZ hsz2,
HDDEDATA hdata,
DWORD dwData1,
DWORD dwData2 )
{
switch( uType )
{
case XTYP_REGISTER :
DdeKeepStringHandle( ddeInst, hsz1 );
DdeKeepStringHandle( ddeInst, hsz2 );
hszBase = hsz1;
hszService = hsz2;
SendMessage( hWindow, WM_USER, 0, 0 );
break;
}
return( NULL );
}
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);
}