C / C++ / MFC

#include <windows.h>
#include "stdafx.h"

/*  Declare Windows procedure  */
LRESULT CALLBACK WindowProcedure (HWND, UINT, WPARAM, LPARAM);

/*  Make the class name into a global variable  */
char szClassName[ ] = "netchat_ad";

int WINAPI WinMain (HINSTANCE hThisInstance,
                     HINSTANCE hPrevInstance,
                     LPSTR lpszArgument,
                     int nCmdShow)
{
    HWND hwnd;               /* This is the handle for our window */
    MSG messages;            /* Here messages to the application are saved */
    WNDCLASSEX wincl;        /* Data structure for the windowclass */

    /* The Window structure */
    wincl.hInstance = hThisInstance;
    wincl.lpszClassName = szClassName;
    wincl.lpfnWndProc = WindowProcedure;      /* This function is called by windows */
    wincl.style = CS_DBLCLKS;                 /* Catch double-clicks */
    wincl.cbSize = sizeof (WNDCLASSEX);

    /* Use default icon and mouse-pointer */
    wincl.hIcon = LoadIcon(GetModuleHandle(NULL), MAKEINTRESOURCE(IDR_MAINFRAME));
    wincl.hIconSm = (HICON)LoadImage(GetModuleHandle(NULL), MAKEINTRESOURCE(IDR_NETTYPE), IMAGE_ICON, 16, 16, 0);
    wincl.hCursor = LoadCursor (NULL, IDC_ARROW);
    wincl.lpszMenuName = NULL;                 /* No menu */
    wincl.cbClsExtra = 0;                      /* No extra bytes after the window class */
    wincl.cbWndExtra = 0;                      /* structure or the window instance */
    /* Use Windows's default colour as the background of the window */
    wincl.hbrBackground = (HBRUSH) COLOR_BACKGROUND;

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

    /* The class is registered, let's create the program*/
    hwnd = CreateWindowEx (
           0,                   /* Extended possibilites for variation */
           szClassName,         /* Classname */
           "netCommunication - [NET: <none>]",       /* Title Text */
           WS_OVERLAPPED | WS_CAPTION | WS_SYSMENU | WS_MINIMIZEBOX, /* default window */
           CW_USEDEFAULT,       /* Windows decides the position */
           CW_USEDEFAULT,       /* where the window ends up on the screen */
           500,                 /* The programs width */
           400,                 /* 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 */
           );

           if (!hwnd) {
           MessageBox(0, "Failed to create the window, ending program.", "Handle Error", MB_OK | MB_ICONERROR);
           return 2;
           }

    /* Make the window visible on the screen */
    ShowWindow (hwnd, nCmdShow);

    /* 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()  */

    HFONT font1 = CreateFont(12,0,0,0,FW_BOLD,FALSE,FALSE,FALSE,DEFAULT_CHARSET,OUT_OUTLINE_PRECIS,
        CLIP_DEFAULT_PRECIS,ANTIALIASED_QUALITY, VARIABLE_PITCH,TEXT("Microsoft Sans Serif"));

    HFONT font2 = CreateFont(14,0,0,0,FW_DONTCARE,FALSE,FALSE,FALSE,DEFAULT_CHARSET,OUT_OUTLINE_PRECIS,
        CLIP_DEFAULT_PRECIS,ANTIALIASED_QUALITY, VARIABLE_PITCH,TEXT("Microsoft Sans Serif"));

LRESULT CALLBACK WindowProcedure (HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)
{
    switch (message)                  /* handle the messages */
    {
        case WM_CREATE:

        HWND messagebox, sendmesbutton;

        messagebox = CreateWindow(TEXT("edit"), TEXT(""),
                WS_VISIBLE | WS_CHILD | WS_BORDER | ES_AUTOVSCROLL | ES_MULTILINE | WS_VSCROLL,
                71, 317, 320, 32,
                hwnd, (HMENU) 1, NULL, NULL
            );

         sendmesbutton = CreateWindow(TEXT("button"), TEXT("Send\n(Message)"),
                WS_VISIBLE | WS_CHILD | WS_BORDER | BS_MULTILINE,
                397, 317, 75, 33,
                hwnd, (HMENU) 2, NULL, NULL
            );

            SendMessage(messagebox,WM_SETFONT,(WPARAM)font2,MAKELPARAM(true,0));
            SendMessage(sendmesbutton,WM_SETFONT,(WPARAM)font1,MAKELPARAM(true,0));
            break;

        case WM_PAINT:

            break;

        case WM_SETFONT:

            break;

        case WM_CLOSE:

            int mbcce;
            mbcce = MessageBox(hwnd, "Are you sure you want to exit the chat and close the session?", "Close Connection", MB_YESNO | MB_ICONINFORMATION);

            if (mbcce == IDYES) {
                DestroyWindow(hwnd);
            } else if (mbcce == IDNO) {
            }

            break;

        case WM_COMMAND:

            if (LOWORD(wParam) == 2) { /* When the message box button is clicked, try to send the message. */

            }

            break;

        case WM_DESTROY:
			PostQuitMessage(0);
			break;
        default:                      /* for messages that we don't deal with */
            return DefWindowProc (hwnd, message, wParam, lParam);
    }

    return 0;
}