↓のプログラムはウインドウを表示するプログラムなおですが、どこが悪いのかわりません
どこが悪いのでしょうか？

#include <windows.h>

LRESULT CALLBACK WndProc(HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam);

int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine, int nShowCmd)
{
HWND hWnd;
MSG message;
WNDCLASSEX wc;

wc.hInstance = hInstance;
wc.lpszClassName = "DDraw";
wc.lpfnWndProc = WndProc;
wc.cbSize = sizeof(WNDCLASS);
wc.style = 0;
wc.cbClsExtra = 0;
wc.cbWndExtra = 0;
wc.hbrBackground = (HBRUSH)GetStockObject(WHITE_BRUSH);
wc.hCursor = LoadCursor(NULL, IDC_ARROW);
wc.hIcon = LoadIcon(NULL, IDI_WINLOGO);
wc.lpszMenuName = NULL;

if(!RegisterClassEx(&wc))
return 0;

hWnd = CreateWindow(
"DDraw",
"DirectDraw",
WS_OVERLAPPEDWINDOW,
300,
200,
200,
200,
HWND_DESKTOP,
NULL,
hInstance,
NULL);


ShowWindow(hWnd, nShowCmd);
UpdateWindow(hWnd);

while(GetMessage(&message, NULL, 0, 0)){
TranslateMessage(&message);
DispatchMessage(&message);
}
return message.wParam;
}