home
***
CD-ROM
|
disk
|
FTP
|
other
***
search
/
Windows 95 API Bible
/
Windows 95 API Bible 3 Disc Set.iso
/
Win32 API Bible Book 1 of 3
/
CHAPTE25
/
EX23.C
< prev
next >
Wrap
C/C++ Source or Header
|
1995-04-24
|
3KB
|
73 lines
#include <genstub.c>
// Child thread procedure. The child waits to get event. It then sits idle
// for five seconds and sets the event again so another thread can use it.
DWORD WINAPI ChildThreadProc( HWND hWnd )
{
char szBuffer[256]; // work area for print formatting
HANDLE hAutoEvent = OpenEvent( SYNCHRONIZE, FALSE, "EXAMPLE-AUTOEVENT");
wsprintf( szBuffer, "Thread %x waiting for Event %x",
GetCurrentThreadId( ), hAutoEvent );
SendMessage( hWnd, WM_USER, 0, (LPARAM)szBuffer );
// Check that write auto reset is signaled.
WaitForSingleObject( hAutoEvent, INFINITE );
wsprintf( szBuffer,"Thread %x got event", GetCurrentThreadId( ) );
SendMessage( hWnd, WM_USER, 0, (LPARAM)szBuffer );
Sleep( 5000 );
// Release event.
wsprintf( szBuffer,"Thread %x is done with event", GetCurrentThreadId( ) );
SendMessage( hWnd, WM_USER, 0, (LPARAM)szBuffer );
SetEvent( hAutoEvent );
CloseHandle( hAutoEvent );
ExitThread( TRUE );
}
// Windows message procedure.
LRESULT CALLBACK WndProc( HWND hWnd, UINT uMsg, WPARAM wParam, LPARAM lParam )
{
static HANDLE hAutoEvent = 0;
switch (uMsg)
{
case WM_CREATE: // Make an auto-reset event with initial state of signaled.
hAutoEvent = CreateEvent( NULL, FALSE, TRUE, "EXAMPLE-AUTOEVENT");
return DefWindowProc( hWnd, uMsg, wParam, lParam );
case WM_DESTROY:
if ( hAutoEvent )
CloseHandle( hAutoEvent );
PostQuitMessage( 0 );
break;
case WM_USER:
{ // Message to show synchronization actions.
TCHAR szBuffer[101];
static int row = 0;
static int msg_num = 1;
HDC hDC = GetDC( hWnd );
FillMemory( szBuffer, 100, 32 );
TextOut( hDC, 0, row, szBuffer, 100 );
wsprintf( szBuffer, "%3d: %s", msg_num++, (LPTSTR)lParam );
TextOut( hDC, 0, row, szBuffer, lstrlen( szBuffer ) );
row = ( row > 200 ) ? 0 : row+=20;
ReleaseDC( hWnd, hDC );
}
break;
case WM_COMMAND: // process menu items
switch ( LOWORD( wParam ) )
{
case IDM_TEST:
{
DWORD id = 0;
CreateThread( NULL, 0, ChildThreadProc, hWnd, 0, &id );
}
break;
case IDM_EXIT:
DestroyWindow( hWnd );
break;
}
break;
default:
return DefWindowProc( hWnd, uMsg, wParam, lParam );
}
return NULL;
}