// ThreadSwitch.cpp : Defines the entry point for the application.
//
#include "stdafx.h"
#include "ThreadSwitch.h"
#include "tswitch.h"
#define MAX_LOADSTRING 100
//
// Global Variables:
//
HINSTANCE hInst; // current instance
TCHAR szTitle[MAX_LOADSTRING]; // The title bar text
TCHAR szWindowClass[MAX_LOADSTRING]; // the main window class name
//
// Forward declarations of functions included in this code module:
//
ATOM MyRegisterClass(HINSTANCE hInstance);
BOOL InitInstance(HINSTANCE, int);
LRESULT CALLBACK WndProc(HWND, UINT, WPARAM, LPARAM);
INT_PTR CALLBACK About(HWND, UINT, WPARAM, LPARAM);
void RunThread( void *pv );
int __stdcall StdcallFunction( HWND hwnd, char ch, int a );
int __cdecl CdeclFunction( HWND hwnd, short a, short b );
int APIENTRY _tWinMain( HINSTANCE hInstance,
HINSTANCE hPrevInstance,
LPTSTR lpCmdLine,
int nCmdShow)
{
UNREFERENCED_PARAMETER(hPrevInstance);
UNREFERENCED_PARAMETER(lpCmdLine);
MSG msg;
HACCEL hAccelTable;
//
// Initialize global strings
//
LoadString(hInstance, IDS_APP_TITLE, szTitle, MAX_LOADSTRING);
LoadString(hInstance, IDC_THREADSWITCH, szWindowClass, MAX_LOADSTRING);
MyRegisterClass(hInstance);
//
// Perform application initialization:
//
if (!InitInstance (hInstance, nCmdShow))
{
return FALSE;
}
hAccelTable = LoadAccelerators(hInstance, MAKEINTRESOURCE(IDC_THREADSWITCH));
//
// Main message loop:
//
while (GetMessage(&msg, NULL, 0, 0))
{
if (!TranslateAccelerator(msg.hwnd, hAccelTable, &msg))
{
TranslateMessage(&msg);
DispatchMessage(&msg);
}
}
return (int) msg.wParam;
}
//
// FUNCTION: MyRegisterClass()
//
// PURPOSE: Registers the window class.
//
// COMMENTS:
//
// This function and its usage are only necessary if you want this code
// to be compatible with Win32 systems prior to the 'RegisterClassEx'
// function that was added to Windows 95. It is important to call this function
// so that the application will get 'well formed' small icons associated
// with it.
//
ATOM MyRegisterClass(HINSTANCE hInstance)
{
WNDCLASSEX wcex;
wcex.cbSize = sizeof(WNDCLASSEX);
wcex.style = CS_HREDRAW | CS_VREDRAW;
wcex.lpfnWndProc = WndProc;
wcex.cbClsExtra = 0;
wcex.cbWndExtra = 0;
wcex.hInstance = hInstance;
wcex.hIcon = LoadIcon(hInstance, MAKEINTRESOURCE(IDI_THREADSWITCH));
wcex.hCursor = LoadCursor(NULL, IDC_ARROW);
wcex.hbrBackground = (HBRUSH)CreateSolidBrush( RGB( 240, 240, 240 ) );
wcex.lpszMenuName = MAKEINTRESOURCE(IDC_THREADSWITCH);
wcex.lpszClassName = szWindowClass;
wcex.hIconSm = LoadIcon(wcex.hInstance, MAKEINTRESOURCE(IDI_SMALL));
return RegisterClassEx(&wcex);
}
//
// FUNCTION: InitInstance(HINSTANCE, int)
//
// PURPOSE: Saves instance handle and creates main window
//
// COMMENTS:
//
// In this function, we save the instance handle in a global variable and
// create and display the main program window.
//
BOOL InitInstance(HINSTANCE hInstance, int nCmdShow)
{
HWND hWnd;
//
// Store instance handle in our global variable
//
hInst = hInstance;
SIZE sizeScreen = { GetSystemMetrics( SM_CXSCREEN ),
GetSystemMetrics( SM_CYSCREEN ) };
SIZE sizeWin = { 320, 240 };
hWnd = CreateWindow( szWindowClass, szTitle, WS_OVERLAPPEDWINDOW,
( sizeScreen.cx - sizeWin.cx ) / 2,
( sizeScreen.cy - sizeWin.cy ) / 2,
sizeWin.cx,
sizeWin.cy,
NULL, NULL, hInstance, NULL);
if (!hWnd)
{
return FALSE;
}
ShowWindow(hWnd, nCmdShow);
UpdateWindow(hWnd);
return TRUE;
}
//
// FUNCTION: WndProc(HWND, UINT, WPARAM, LPARAM)
//
// PURPOSE: Processes messages for the main window.
//
// WM_COMMAND - process the application menu
// WM_PAINT - Paint the main window
// WM_DESTROY - post a quit message and return
//
LRESULT CALLBACK WndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)
{
int wmId, wmEvent;
PAINTSTRUCT ps;
HDC hdc;
RECT rcClient;
static const TCHAR szText[] = _T( "Click anywhere in the window to exercise thread switching." );
//
// process WM_INVOKE; this cannot be a case statement because
// WM_INVOKE is not a constant
//
if( message == WM_INVOKE )
{
THREAD_SWITCH_INVOKE(wParam);
}
switch (message)
{
case WM_COMMAND:
wmId = LOWORD(wParam);
wmEvent = HIWORD(wParam);
//
// Parse the menu selections:
//
switch (wmId)
{
case IDM_ABOUT:
DialogBox(hInst, MAKEINTRESOURCE(IDD_ABOUTBOX), hWnd, About);
break;
case IDM_EXIT:
DestroyWindow(hWnd);
break;
default:
return DefWindowProc(hWnd, message, wParam, lParam);
}
break;
case WM_PAINT:
hdc = BeginPaint(hWnd, &ps);
GetClientRect( hWnd, &rcClient );
SetBkMode( ps.hdc, TRANSPARENT );
DrawText( ps.hdc, szText, ( sizeof( szText ) / sizeof( TCHAR ) ) - 1,
&rcClient,
DT_CENTER | DT_WORDBREAK );
EndPaint(hWnd, &ps);
break;
case WM_LBUTTONDOWN:
{
_beginthread( RunThread, 0, hWnd );
break;
};
case WM_DESTROY:
PostQuitMessage(0);
break;
default:
return DefWindowProc(hWnd, message, wParam, lParam);
}
return 0;
}
int __stdcall StdcallFunction( HWND hwnd, char ch, int a )
{
THREAD_SWITCH_WITH_RETURN(hwnd, StdcallFunction, 3, ccStdcall, int)
TCHAR szBuf[1024];
wsprintf( szBuf, _T( "Thread ID = %d, hwnd = 0x%X, ch = %c, a = %d\n" ),
GetCurrentThreadId(), (DWORD_PTR)hwnd, ch, a );
MessageBox( hwnd, szBuf, _T( "ThreadSwitch - STDCALL" ), MB_OK | MB_ICONINFORMATION );
return 5;
}
int __cdecl CdeclFunction( HWND hwnd, short a, short b )
{
THREAD_SWITCH_WITH_RETURN(hwnd, CdeclFunction, 3, ccCdecl, int)
TCHAR szBuf[1024];
wsprintf( szBuf, _T( "Thread ID = %d, hwnd = 0x%X, a = %d, b = %d\n" ),
GetCurrentThreadId(), (DWORD_PTR)hwnd, a, b );
MessageBox( hwnd, szBuf, _T( "ThreadSwitch - CDECL" ), MB_OK | MB_ICONINFORMATION );
return 10;
}
void RunThread( void *pv )
{
int result;
result = StdcallFunction( (HWND)pv, 'c', 20 );
_ASSERT( result == 5 );
result = CdeclFunction( (HWND)pv, 10, 20 );
_ASSERT( result == 10 );
}
//
// Message handler for about box.
//
INT_PTR CALLBACK About(HWND hDlg, UINT message, WPARAM wParam, LPARAM lParam)
{
UNREFERENCED_PARAMETER(lParam);
switch (message)
{
case WM_INITDIALOG:
return (INT_PTR)TRUE;
case WM_COMMAND:
if (LOWORD(wParam) == IDOK || LOWORD(wParam) == IDCANCEL)
{
EndDialog(hDlg, LOWORD(wParam));
return (INT_PTR)TRUE;
}
break;
}
return (INT_PTR)FALSE;
}