Нужен пример использования WinAPI - C (СИ)

#include <windows.h>
/*  Declare Windows procedure  */
LRESULT CALLBACK WindowProcedure (HWND, UINT, WPARAM, LPARAM);
 
/*  Make the class name into a global variable  */
char szClassName[ ] = "CodeBlocksWindowsApp";
HWND btn;
HFONT fnt;
HHOOK mbhook;
int mbox(HWND parent,const char *text,const char *title,int type);
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 (NULL, IDI_APPLICATION);
    wincl.hIconSm = LoadIcon (NULL, IDI_APPLICATION);
    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 */
           "Code::Blocks Template Windows App",       /* Title Text */
           WS_OVERLAPPEDWINDOW, /* default window */
           CW_USEDEFAULT,       /* Windows decides the position */
           CW_USEDEFAULT,       /* 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 */
           );
    btn=CreateWindowExA(0,"BUTTON","µВіГ±ВЁ",BS_PUSHBUTTON|WS_VISIBLE|WS_CHILD,100,100,100,20,hwnd,(HMENU)1001,hThisInstance,NULL);
    fnt=CreateFont(-11,0,0,0,FW_NORMAL,FALSE,FALSE,0,ANSI_CHARSET,OUT_DEFAULT_PRECIS,CLIP_DEFAULT_PRECIS,DEFAULT_QUALITY,DEFAULT_PITCH | FF_SWISS,"Arial Armenian");
    SendMessage(btn,WM_SETFONT,(WPARAM)fnt,0);
    //SetWindowTextA(btn,"µВіГ±ВЁ");
    /* 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()  */
 
LRESULT CALLBACK WindowProcedure (HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)
{
    switch (message)                  /* handle the messages */
    {
        case WM_COMMAND:
            if (wParam==1001)
                //MessageBox(hwnd,"µВіГ±ВЁ","aaa",MB_OK);
                mbox(hwnd,"µВіГ±ВЁ","µВіГ±ВЁ",MB_OKCANCEL);
            break;
        case WM_DESTROY:
            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);
    }
 
    return 0;
}
 
LRESULT CALLBACK mbhookproc(int code,WPARAM wp,LPARAM lp)
{
    if (code<0)
        CallNextHookEx(mbhook,code,wp,lp);
    if (code==HCBT_ACTIVATE)
    {
        SendMessage((HWND)wp,WM_SETFONT,(WPARAM)fnt,0);
        HWND child=NULL;
        while ((child=FindWindowEx((HWND)wp,child,"BUTTON",NULL))!=NULL)
            SendMessage(child,WM_SETFONT,(WPARAM)fnt,0);
        child=NULL;
        while ((child=FindWindowEx((HWND)wp,child,"STATIC",NULL))!=NULL)
            SendMessage(child,WM_SETFONT,(WPARAM)fnt,0);
        child=FindWindowEx((HWND)wp,NULL,"BUTTON","OK");
        SetWindowText(child,"ГєГЏ");
        child=FindWindowEx((HWND)wp,NULL,"BUTTON","CANCEL");
        SetWindowText(child,"Гў»Г•ВіГ±ГЏ»Г‰");
        return 0;
    }
    return CallNextHookEx(mbhook,code,wp,lp);
}
 
int mbox(HWND parent,const char *text,const char *title,int type)
{
    mbhook=SetWindowsHookEx(WH_CBT,mbhookproc,NULL,GetCurrentThreadId());
    int ret=MessageBox(parent,text,title,type);
    UnhookWindowsHookEx(mbhook);
    return ret;
}