void* wc, *wc2, *buttonHello;
const char str1[]=”Hello World!”;
const char str2[]=”这是我的第一个程序！”;
const char str3[]=”SGOS通过gui.dll实现了交互系统！”;
const char str4[]=”欢迎大家参与SGOS的系统开发！”;
const char str5[]=”开发QQ群：11927128″;
int WindowProcedure(void* window, int message, ULONG param1, ULONG param2)
{
char keychar[2]=””;
switch( message )
{
case WM_MBUTTONDBLCLK:
PostQuitMessage(0);
break;
case WM_KEYDOWN:
keychar[0]=param1;
printf(“You press key [%X], char: %s\\n”, param2, keychar );
if( param1==\’c\’ )
{
    void* parent = GetClient(window);
    void* button = CreateButton(parent, “按钮Button1”, 0, rand()%350, rand()%300 );
    printf(“CreateButton: 0x%X\\n”, button );
}
break;
case WM_LBUTTONUP:
if( window==buttonHello )
{
    PBitmap bitmap = GetWindowBitmap(wc);
    DrawText( bitmap, str1, strlen(str1), 5, 5, FONT_MINI_SIZE, BLACK, 0 );
    DrawText( bitmap, str2, strlen(str2), 5, 20, FONT_MINI_SIZE, BLACK, 0 );
    DrawText( bitmap, str3, strlen(str3), 5, 35, FONT_NORMAL_SIZE, BLACK, 0 );
    DrawText( bitmap, str4, strlen(str4), 5, 55, FONT_NORMAL_SIZE, RED, 0 );
    DrawText( bitmap, str5, strlen(str5), 5, 75, FONT_MINI_SIZE, BLACK, TEXT_RIGHTSLANT );
    RefreshWindow( wc, NULL );
}
default: // for messages that we don\’t deal with
     return DefWindowProc (window, message, param1, param2);
}
return 0;
}
int TestWC()
{
wc = CreateWindowClass(
NULL, //父窗体 NULL表示桌面
“我的程序Hello World!”, //窗口标题
0,    //风格
10, 10, //位置
400, 350, //大小
NULL,    //图标
WindowProcedure, //处理窗口消息的函数
NULL, //指针图标
NULL, //菜单
WHITE //背景色
);
wc2 = CreateWindowClass(
NULL, //父窗体 NULL表示桌面
“Demo2”, //窗口标题
0,    //风格
100, 100, //位置
450, 400, //大小
NULL,    //图标
WindowProcedure, //处理窗口消息的函数
NULL, //指针图标
NULL, //菜单
LIGHTGRAY //背景色
);
buttonHello = CreateButton(wc, “Say Hello”, 0, 300, 10 );
MSG msg;
while(msg.message!=WM_MBUTTONDBLCLK )
{
if( GetMessage( AND msg, 0) )
{
DispatchMessage( AND msg );
}
}
}