Flashing a window

#include <windows.h>LRESULT CALLBACK WndProc(HWND, UINT, WPARAM, LPARAM);int WINAPI wWinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance,                    PWSTR lpCmdLine, int nCmdShow){  MSG  msg;      WNDCLASSW wc = {0};  wc.lpszClassName = L"Flash";  wc.hInstance     = hInstance;  wc.hbrBackground = GetSysColorBrush(COLOR_3DFACE);  wc.lpfnWndProc   = WndProc;  wc.hCursor       = LoadCursor(0,IDC_ARROW);  RegisterClassW(&wc);  CreateWindowW(wc.lpszClassName, L"Flash",               WS_OVERLAPPEDWINDOW | WS_VISIBLE,               100, 100, 250, 180, 0, 0, hInstance, 0);  while( GetMessage(&msg, NULL, 0, 0)) {    TranslateMessage(&msg);    DispatchMessage(&msg);  }  return (int) msg.wParam;}LRESULT CALLBACK WndProc(HWND hwnd, UINT msg,    WPARAM wParam, LPARAM lParam ){  FLASHWINFO fwi;  switch(msg)    {      case WM_CREATE:          CreateWindowW(L"Button", L"Flash",                  WS_CHILD | WS_VISIBLE,                  10, 10, 80, 25,                   hwnd, (HMENU) 1, NULL, NULL);          break;      case WM_COMMAND:          fwi.cbSize = sizeof(fwi);          fwi.dwFlags = FLASHW_ALL;          fwi.dwTimeout = 0;          fwi.hwnd = hwnd;          fwi.uCount = 4;          FlashWindowEx(&fwi);          break;      case WM_DESTROY:          PostQuitMessage(0);          break;   }  return DefWindowProcW(hwnd, msg, wParam, lParam);}