LRESULT CALLBACK WindowProcedure (HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)
{static bool b;switch (message)                  /* handle the messages */{case WM_CREATE:b=false;break;case WM_PAINT://DrawBackground(hwnd);DrawButton(hwnd, RGB(24, 82, 93));break;case WM_LBUTTONDOWN:{UINT cx=LOWORD(lParam);UINT cy=HIWORD(lParam);if(cx>=10 && cx<=100){if(cy>=10 && cy<=50){DrawButton(hwnd, RGB(24, 82, 93));b=false;break;}}}break;case WM_LBUTTONUP:{UINT cx=LOWORD(lParam);UINT cy=HIWORD(lParam);if(cx>=10 && cx<=100){if(cy>=10 && cy<=50){DrawButton(hwnd, RGB(200, 82, 93));b=true;MessageBox(hwnd, "CAUTION: YOU JUST CLICKED ONE CUSTOMER-BUTTON", "", MB_ICONINFORMATION);break;}}}break;case WM_MOUSEMOVE:{UINT cx=LOWORD(lParam);UINT cy=HIWORD(lParam);if(cx>=10 && cx<=100){if(cy>=10 && cy<=50){if(!b){DrawButton(hwnd, RGB(200, 82, 93));b=true;}break;}}if(b){DrawButton(hwnd, RGB(24, 82, 93));b=false;}}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;
}

void DrawPng(HWND hwnd)
{PAINTSTRUCT ps;BeginPaint(hwnd, &ps);Gdiplus::GpGraphics *graphics;Gdiplus::GpImage *image;WCHAR file[256]={L"D:\\alert.png"};Gdiplus::DllExports::GdipCreateFromHDC(GetDC(hwnd), &graphics);Gdiplus::DllExports::GdipLoadImageFromFile(file, &image);Gdiplus::DllExports::GdipDrawImageRect(graphics, image, 66, 12, 32, 32);Gdiplus::DllExports::GdipDisposeImage(image);Gdiplus::DllExports::GdipDeleteGraphics(graphics);EndPaint(hwnd, &ps);
}void DrawButton(HWND hwnd, COLORREF rgb)
{PAINTSTRUCT ps;HDC hdc;HRGN hrgn;HBRUSH hbrush;HFONT of, nf;LOGFONT lf;TCHAR fn[32]=_T("Couriew New");RECT rect={10,10,100,50};BeginPaint(hwnd, &ps);hdc=GetDC(hwnd);hrgn=CreateRoundRectRgn(10, 10, 100, 50, 10, 10);hbrush=CreateSolidBrush(rgb);//RGB(24, 82, 93)
    FillRgn(hdc, hrgn, hbrush);FrameRgn(hdc, hrgn, (HBRUSH)GetStockObject(GRAY_BRUSH), 1, 1);SetBkMode(hdc, TRANSPARENT);SetTextColor(hdc, RGB(255, 255, 255));of=(HFONT)SendMessage(hwnd, WM_GETFONT, (WPARAM)NULL, (LPARAM)NULL);ZeroMemory(&lf, sizeof(lf));GetObject(of, sizeof(lf), &lf);MoveMemory(&lf.lfFaceName, fn, 32);nf=(HFONT)CreateFontIndirect(&lf);SelectObject(hdc, nf);DrawText(hdc, "    Button", -1, &rect, DT_SINGLELINE|DT_LEFT|DT_VCENTER);SelectObject(hdc, of);DeleteObject(nf);DeleteObject(hbrush);DeleteObject(hrgn);ReleaseDC(hwnd, hdc);EndPaint(hwnd, &ps);DrawPng(hwnd);
}