#include <windows.h>

#define p1 101
#define p2 102
#define p3 103

/*  Declare Windows procedure  */
LRESULT CALLBACK WindowProcedure1 (HWND, UINT, WPARAM, LPARAM);
LRESULT CALLBACK WindowProcedure2 (HWND, UINT, WPARAM, LPARAM);
LRESULT CALLBACK WindowProcedure3 (HWND, UINT, WPARAM, LPARAM);
LRESULT CALLBACK tworzPrzycisk(HWND);
HWND global;
HWND przycisk1;
HWND przycisk2;
HWND przycisk3;
/*  Make the class name into a global variable  */
char szClassName1[ ] = "WindowsApp1";
char szClassName2[ ] = "WindowsApp2";
char szClassName3[ ] = "WindowsApp3";
HINSTANCE hInstance;
int WINAPI WinMain (HINSTANCE hThisInstance,
                    HINSTANCE hPrevInstance,
                    LPSTR lpszArgument,
                    int nFunsterStil)

{
    hInstance = hThisInstance;

    HWND hwnd1;
    HWND hwnd2;
    HWND hwnd3;               /* This is the handle for our window */
    MSG messages;            /* Here messages to the application are saved */
    WNDCLASSEX wincl1;
    WNDCLASSEX wincl2;
    WNDCLASSEX wincl3;        /* Data structure for the windowclass */

    /* The Window structure */
    wincl1.hInstance = hThisInstance;
    wincl1.lpszClassName = szClassName1;
    wincl1.lpfnWndProc = WindowProcedure1;      /* This function is called by windows */
    wincl1.style = CS_DBLCLKS;                 /* Catch double-clicks */
    wincl1.cbSize = sizeof (WNDCLASSEX);
    wincl2.hInstance = hThisInstance;
    wincl2.lpszClassName = szClassName2;
    wincl2.lpfnWndProc = WindowProcedure2;      /* This function is called by windows */
    wincl2.style = CS_DBLCLKS;                 /* Catch double-clicks */
    wincl2.cbSize = sizeof (WNDCLASSEX);
    wincl3.hInstance = hThisInstance;
    wincl3.lpszClassName = szClassName3;
    wincl3.lpfnWndProc = WindowProcedure3;      /* This function is called by windows */
    wincl3.style = CS_DBLCLKS;                 /* Catch double-clicks */
    wincl3.cbSize = sizeof (WNDCLASSEX);

    /* Use default icon and mouse-pointer */
    wincl1.hIcon = LoadIcon (NULL, IDI_APPLICATION);
    wincl1.hIconSm = LoadIcon (NULL, IDI_APPLICATION);
    wincl1.hCursor = LoadCursor (NULL, IDC_ARROW);
    wincl1.lpszMenuName = NULL;                 /* No menu */
    wincl1.cbClsExtra = 0;                      /* No extra bytes after the window class */
    wincl1.cbWndExtra = 0;
    wincl2.hIcon = LoadIcon (NULL, IDI_APPLICATION);
    wincl2.hIconSm = LoadIcon (NULL, IDI_APPLICATION);
    wincl2.hCursor = LoadCursor (NULL, IDC_ARROW);
    wincl2.lpszMenuName = NULL;                 /* No menu */
    wincl2.cbClsExtra = 0;                      /* No extra bytes after the window class */
    wincl2.cbWndExtra = 0;
    wincl3.hIcon = LoadIcon (NULL, IDI_APPLICATION);
    wincl3.hIconSm = LoadIcon (NULL, IDI_APPLICATION);
    wincl3.hCursor = LoadCursor (NULL, IDC_ARROW);
    wincl3.lpszMenuName = NULL;                 /* No menu */
    wincl3.cbClsExtra = 0;                      /* No extra bytes after the window class */
    wincl3.cbWndExtra = 0;                      /* structure or the window instance */
    /* Use Windows's default color as the background of the window */
    wincl1.hbrBackground = (HBRUSH) COLOR_BACKGROUND;
    wincl2.hbrBackground = (HBRUSH) COLOR_BACKGROUND;
    wincl3.hbrBackground = (HBRUSH) COLOR_BACKGROUND;

    /* Register the window class, and if it fails quit the program */
    if (!RegisterClassEx (&wincl1))
        return 0;
        if (!RegisterClassEx (&wincl2))
        return 0;
        if (!RegisterClassEx (&wincl3))
        return 0;

    /* The class is registered, let's create the program*/
    hwnd1 = CreateWindowEx (
           0,                   /* Extended possibilites for variation */
           szClassName1,         /* Classname */
           "Program nr.1",       /* Title Text */
           WS_OVERLAPPEDWINDOW, /* default window */
           100,       /* Windows decides the position */
           100,       /* where the window ends up on the screen */
           544,                 /* The programs width */
           375,                 /* and height in pixels */
           HWND_DESKTOP,        /* The window is a child-window to desktop */
           NULL,                /* No menu */
           hThisInstance,       /* Program Instance handler */
           NULL                 /* No Window Creation data */
           );
           /* Make the window visible on the screen */
    ShowWindow (hwnd1, nFunsterStil);
           hwnd2 = CreateWindowEx (
           0,                   /* Extended possibilites for variation */
           szClassName2,         /* Classname */
           "Program nr.2",       /* Title Text */
           WS_OVERLAPPEDWINDOW, /* default window */
           300,       /* Windows decides the position */
           200,       /* where the window ends up on the screen */
           544,                 /* The programs width */
           375,                 /* and height in pixels */
           HWND_DESKTOP,        /* The window is a child-window to desktop */
           NULL,                /* No menu */
           hThisInstance,       /* Program Instance handler */
           NULL                 /* No Window Creation data */
           );

           ShowWindow (hwnd2, nFunsterStil);
           hwnd3 = CreateWindowEx (
           0,                   /* Extended possibilites for variation */
           szClassName3,         /* Classname */
           "Program nr.3",       /* Title Text */
           WS_OVERLAPPEDWINDOW, /* default window */
           500,       /* Windows decides the position */
           300,       /* where the window ends up on the screen */
           544,                 /* The programs width */
           375,                 /* and height in pixels */
           HWND_DESKTOP,        /* The window is a child-window to desktop */
           NULL,                /* No menu */
           hThisInstance,       /* Program Instance handler */
           NULL                 /* No Window Creation data */
           );
           global = hwnd2;
    /* Make the window visible on the screen */
    ShowWindow (hwnd3, nFunsterStil);
    /* Run the message loop. It will run until GetMessage() returns 0 */
    while (GetMessage (&messages, NULL, 0, 0))
    {
        /* Translate virtual-key messages into character messages */
        TranslateMessage(&messages);
        /* Send message to WindowProcedure */
        DispatchMessage(&messages);
    }

    /* The program return-value is 0 - The value that PostQuitMessage() gave */
    return messages.wParam;
}


/*  This function is called by the Windows function DispatchMessage()  */

LRESULT CALLBACK WindowProcedure1 (HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)
{
    switch (message)                  /* handle the messages */
    {
        case WM_DESTROY:
            if(hwnd == global)
            {
                PostQuitMessage (0);       /* send a WM_QUIT to the message queue */
                break;
            }
        default:                      /* for messages that we don't deal with */
            return DefWindowProc (hwnd, message, wParam, lParam);
        case WM_CHAR:
             switch(wParam)
             {
                            case '1':
                            PostQuitMessage (0);
                            break;
             }

    }

    return 0;
}
LRESULT CALLBACK WindowProcedure2 (HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)
{
    switch (message)                  /* handle the messages */
    {
        case WM_DESTROY:
            if(hwnd == global)
            {
                PostQuitMessage (0);       /* send a WM_QUIT to the message queue */
                break;
            }
        default:                      /* for messages that we don't deal with */
            return DefWindowProc (hwnd, message, wParam, lParam);
        case WM_CHAR:
             switch(wParam)
             {
                            case '2':
                            PostQuitMessage (0);
                            break;
             }
    }

    return 0;
}
LRESULT CALLBACK WindowProcedure3 (HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)
{
    switch (message)                  /* handle the messages */
    {
        case WM_DESTROY:
            if(hwnd == global)
            {
                PostQuitMessage (0);       /* send a WM_QUIT to the message queue */
                break;
            }
        default:                      /* for messages that we don't deal with */
            return DefWindowProc (hwnd, message, wParam, lParam);
        case WM_CHAR:
             switch(wParam)
             {
                            case '3':
                            PostQuitMessage (0);
                            break;
             }
        case WM_CREATE:
             tworzPrzycisk(hwnd);
             break;
        case WM_COMMAND:
             switch(wParam)
             case p1:
                  PostQuitMessage (0);
                            break;
    }

    return 0;
}

LRESULT CALLBACK tworzPrzycisk(HWND hwnd)
{
        przycisk1 = CreateWindowEx (
           0,                   /* Extended possibilites for variation */
           "BUTTON",         /* Classname */
           "Przycisk1",       /* Title Text */
           WS_CHILD | WS_VISIBLE | BS_PUSHBUTTON, /* default window */
           50,       /* Windows decides the position */
           50,       /* where the window ends up on the screen */
           100,                 /* The programs width */
           50,                 /* and height in pixels */
           hwnd,        /* The window is a child-window to desktop */
           (HMENU)p1,                /* No menu */
           hInstance,       /* Program Instance handler */
           NULL                 /* No Window Creation data */
           );
           przycisk2 = CreateWindowEx (
           0,                   /* Extended possibilites for variation */
           "BUTTON",         /* Classname */
           "Przycisk2",       /* Title Text */
           WS_CHILD | WS_VISIBLE | BS_AUTORADIOBUTTON, /* default window */
           150,       /* Windows decides the position */
           150,       /* where the window ends up on the screen */
           100,                 /* The programs width */
           50,                 /* and height in pixels */
           hwnd,        /* The window is a child-window to desktop */
           (HMENU)p2,                /* No menu */
           hInstance,       /* Program Instance handler */
           NULL                 /* No Window Creation data */
           );
           przycisk3 = CreateWindowEx (
           0,                   /* Extended possibilites for variation */
           "BUTTON",         /* Classname */
           "Przycisk3",       /* Title Text */
           WS_CHILD | WS_VISIBLE | BS_AUTOCHECKBOX, /* default window */
           250,       /* Windows decides the position */
           250,       /* where the window ends up on the screen */
           100,                 /* The programs width */
           50,                 /* and height in pixels */
           hwnd,        /* The window is a child-window to desktop */
           (HMENU)p3,                /* No menu */
           hInstance,       /* Program Instance handler */
           NULL                 /* No Window Creation data */
           );
}