Прозрачное окно в FAQ - ???

COLORREF cl;
cl = RGB(0,180,26);
HBRUSH hBrColor = CreateSolidBrush(cl);
SetClassLong(hWndFir, GCL_HBRBACKGROUND, (LONG)hBrColor); // изменяем цвет фона
InvalidateRect(hWndFir, NULL, TRUE); // заставляем окно перерисоваться

#define WS_EX_LAYERED 0x00080000
#define GWL_EX_STYLE -20
#define LWA_COLORKEY 0x00000001
#define LWA_ALPHA 0x00000002

typedef BOOL (__stdcall*layeredproc)(HWND hWnd, COLORREF crKey, BYTE bAlpha, DWORD dwFlags);
layeredproc lpSetLayeredWindowAttributes=NULL;

HMODULE user32=(HMODULE)LoadLibrary("user32.dll");

BOOL SetLayeredWindowAttributes(HWND hWnd, COLORREF crKey, BYTE bAlpha, DWORD dwFlags) {
    BOOL result=FALSE;
    if(lpSetLayeredWindowAttributes==NULL) {
        if(user32!=NULL) {
            lpSetLayeredWindowAttributes=(layeredproc)GetProcAddress(user32,"SetLayeredWindowAttributes");
        }
    }
    if(lpSetLayeredWindowAttributes!=NULL) {
        result=lpSetLayeredWindowAttributes(hWnd,crKey,bAlpha,dwFlags);
    }
    return result;
}

#include "stdafx.h"
#include "resource.h"

#define MAX_LOADSTRING 100

#define WS_EX_LAYERED 0x00080000
#define GWL_EX_STYLE -20
#define LWA_COLORKEY 0x00000001
#define LWA_ALPHA 0x00000002

// Global Variables:
HINSTANCE hInst;                                // current instance
TCHAR szTitle[MAX_LOADSTRING];                              // The title bar text
TCHAR szWindowClass[MAX_LOADSTRING];                                // The title bar text

//Controls:
HANDLE button1,button2;



// Foward declarations of functions included in this code module:
ATOM                MyRegisterClass(HINSTANCE hInstance);
BOOL                InitInstance(HINSTANCE, int);
LRESULT CALLBACK    WndProc(HWND, UINT, WPARAM, LPARAM);
LRESULT CALLBACK    About(HWND, UINT, WPARAM, LPARAM);

int APIENTRY WinMain(HINSTANCE hInstance,
                     HINSTANCE hPrevInstance,
                     LPSTR     lpCmdLine,
                     int       nCmdShow)
{
    // TODO: Place code here.
    MSG msg;
    HACCEL hAccelTable;

    // Initialize global strings
    LoadString(hInstance, IDS_APP_TITLE, szTitle, MAX_LOADSTRING);
    LoadString(hInstance, IDC_WIN, szWindowClass, MAX_LOADSTRING);
    MyRegisterClass(hInstance);

    // Perform application initialization:
    if (!InitInstance (hInstance, nCmdShow))
    {
        return FALSE;
    }

    hAccelTable = LoadAccelerators(hInstance, (LPCTSTR)IDC_WIN);

    // Main message loop:
    while (GetMessage(&msg, NULL, 0, 0))
    {
        if (!TranslateAccelerator(msg.hwnd, hAccelTable, &msg))
        {
            TranslateMessage(&msg);
            DispatchMessage(&msg);
        }
    }

    return msg.wParam;
}



//
//  FUNCTION: MyRegisterClass()
//
//  PURPOSE: Registers the window class.
//
//  COMMENTS:
//
//    This function and its usage is 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)WndProc;
    wcex.cbClsExtra     = 0;
    wcex.cbWndExtra     = 0;
    wcex.hInstance      = hInstance;
    wcex.hIcon          = LoadIcon(hInstance, (LPCTSTR)IDI_WIN);
    wcex.hCursor        = LoadCursor(NULL, IDC_ARROW);
    wcex.hbrBackground  = (HBRUSH)(COLOR_WINDOW+1);
    wcex.lpszMenuName   = (LPCSTR)IDC_WIN;
    wcex.lpszClassName  = szWindowClass;
    wcex.hIconSm        = LoadIcon(wcex.hInstance, (LPCTSTR)IDI_SMALL);

    return RegisterClassEx(&wcex);
}



typedef BOOL (__stdcall*layeredproc)(HWND hWnd, COLORREF crKey, BYTE bAlpha, DWORD dwFlags);
layeredproc lpSetLayeredWindowAttributes=NULL;

HMODULE user32=(HMODULE)LoadLibrary("user32.dll");

BOOL SetLayeredWindowAttributes(HWND hWnd, COLORREF crKey, BYTE bAlpha, DWORD dwFlags) {
    BOOL result=FALSE;
    if(lpSetLayeredWindowAttributes==NULL) {
        if(user32!=NULL) {
            lpSetLayeredWindowAttributes=(layeredproc)GetProcAddress(user32,"SetLayeredWindowAttributes");
        }
    }
    if(lpSetLayeredWindowAttributes!=NULL) {
        result=lpSetLayeredWindowAttributes(hWnd,crKey,bAlpha,dwFlags);
    }
    return result;
}



void WinProperties(HWND hWnd,HINSTANCE hInstance)
{
   RECT myRect;
   HRGN hRgn;

GetClientRect(hWnd, &myRect);
//hRgn = CreateEllipticRgn(myRect.left, myRect.top, myRect.right, myRect.bottom);
hRgn = CreateEllipticRgn((myRect.right-myRect.left)/2-150,myRect.top+50,(myRect.right-myRect.left)/2+150,myRect.top+200);
SetWindowRgn(hWnd,hRgn, TRUE);


COLORREF cl;
//cl = RGB(0,180,26);
cl = RGB(255,255,255);
HBRUSH hBrColor = CreateSolidBrush(cl);
SetClassLong(hWnd, GCL_HBRBACKGROUND, (LONG)hBrColor); // èçìåíÿåì öâåò ôîíà
InvalidateRect(hWnd, NULL, TRUE); // çàñòàâëÿåì îêíî ïåðåðèñîâàòüñÿ


SetWindowLong(hWnd, GWL_EX_STYLE, GetWindowLong(hWnd, GWL_EX_STYLE) | WS_EX_LAYERED);
//SetLayeredWindowAttributes(hWnd, RGB(0,180,26), 0, LWA_COLORKEY);//Óäàëèòü çåë¸íûé öâåò!
SetLayeredWindowAttributes(hWnd, RGB(255,255,255), 120, LWA_COLORKEY | LWA_ALPHA);//Óäàëèòü áåëûé öâåò!
//SetLayeredWindowAttributes(hWnd, RGB(0,180,26), 120, LWA_COLORKEY | LWA_ALPHA);//Óäàëèòü áåëûé öâåò!


//SetWindowLong(hWnd, GWL_EX_STYLE, GetWindowLong(hWnd, GWL_EX_STYLE) | WS_EX_LAYERED);
//SetLayeredWindowAttributes(hWnd, 0, 120, LWA_ALPHA);



button1 = CreateWindowEx(WS_EX_TRANSPARENT,"BUTTON","My Button",WS_VISIBLE | WS_CHILD | BS_DEFPUSHBUTTON,((myRect.right-myRect.left)/2)-50, myRect.top+30,100,30,hWnd,0,hInstance,0);
button2 = CreateWindowEx(WS_EX_TRANSPARENT,"BUTTON","Exit",WS_VISIBLE | WS_CHILD | BS_DEFPUSHBUTTON,((myRect.right-myRect.left)/2)-50, myRect.top+60,100,30,hWnd,0,hInstance,0);
}

//
//   FUNCTION: InitInstance(HANDLE, 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;


   hInst = hInstance; // Store instance handle in our global variable

   hWnd = CreateWindow(szWindowClass, szTitle, WS_OVERLAPPEDWINDOW,
      CW_USEDEFAULT, 0, CW_USEDEFAULT, 0, NULL, NULL, hInstance, NULL);

   if (!hWnd)
   {
      return FALSE;
   }


WinProperties(hWnd,hInstance);

   ShowWindow(hWnd, nCmdShow);
   UpdateWindow(hWnd);

   return TRUE;
}




//
//  FUNCTION: WndProc(HWND, unsigned, WORD, LONG)
//
//  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)
{
        //      RECT myRect;
        //      HRGN hRgn;

    int wmId, wmEvent;
    PAINTSTRUCT ps;
    HDC hdc;
    TCHAR szHello[MAX_LOADSTRING];
    LoadString(hInst, IDS_HELLO, szHello, MAX_LOADSTRING);


    switch (message)
    {
        case WM_COMMAND:
            wmId    = LOWORD(wParam);
            wmEvent = HIWORD(wParam);
            // Parse the menu selections:

            if((HWND) lParam==button1)
            {
                MessageBox(hWnd,"Hello World!","Hello World!",MB_OK);
            }
            if((HWND) lParam==button2)
            {
            PostQuitMessage(0);
            }

            switch (wmId)
            {
                case IDM_about :
                   DialogBox(hInst, (LPCTSTR)IDD_ABOUTBOX, hWnd, (DLGPROC)About);
                   break;
                case IDM_EXIT:
                   DestroyWindow(hWnd);
                   break;
                default:
                   return DefWindowProc(hWnd, message, wParam, lParam);
            }
            break;

        case WM_PAINT:

            hdc = BeginPaint(hWnd, &ps);
            // TODO: Add any drawing code here...
            RECT rt;
            GetClientRect(hWnd, &rt);
            DrawText(hdc, szHello, strlen(szHello), &rt, DT_CENTER);
            EndPaint(hWnd, &ps);
            break;


case WM_NCHITTEST:
//if(ìûøêà â òîé îáëàñòè îêíà çà êîòîðóþ ìîæíî òÿíóòü)
return HTCAPTION;
break;


        case WM_DESTROY:
            PostQuitMessage(0);
            break;
        default:
            return DefWindowProc(hWnd, message, wParam, lParam);
   }
   return 0;
}

// Mesage handler for about box.
LRESULT CALLBACK About(HWND hDlg, UINT message, WPARAM wParam, LPARAM lParam)
{
    switch (message)
    {
        case WM_INITDIALOG:
                return TRUE;

        case WM_COMMAND:
            if (LOWORD(wParam) == IDOK || LOWORD(wParam) == IDCANCEL)
            {
                EndDialog(hDlg, LOWORD(wParam));
                return TRUE;
            }
            break;
    }
    return FALSE;
}