MFC窗口问题

#include <windows.h>
#include <stdio.h>LRESULT CALLBACK WinRacProc(
  HWND hwnd,      // handle to window
  UINT uMsg,      // message identifier
  WPARAM wParam,  // first message parameter
  LPARAM lParam   // second message parameter
);int WINAPI WinMain(
  HINSTANCE hInstance,  // handle to current instance
  HINSTANCE hPrevInstance,  // handle to previous instance
  LPSTR lpCmdLine,      // pointer to command line
  int nCmdShow          // show state of window
  )
{
WNDCLASS ra;
ra.cbClsExtra = 0;
ra.cbWndExtra = 0;
ra.hbrBackground = (HBRUSH)GetStockObject(BLACK_BRUSH);
ra.hCursor = LoadCursor(NULL,IDC_CROSS);
ra.hIcon = LoadIcon(NULL,IDI_ERROR);
ra.hInstance = hInstance;
ra.lpfnWndProc = WinRacProc;
ra.lpszClassName = "rach";
ra.lpszMenuName = NULL;
ra.style = CS_HREDRAW | CS_VREDRAW; RegisterClass(&ra);
HWND hwnd;
hwnd = CreateWindow("rach","racWin",WS_OVERLAPPEDWINDOW,
0,0,600,500,NULL,NULL,hInstance,NULL); ShowWindow(hwnd,SW_SHOWNORMAL);
UpdateWindow(hwnd); MSG msg;
while(GetMessage(&msg,NULL,0,0)){
TranslateMessage(&msg);
DispatchMessage(&msg);
} return 0;
}
用的是VC6.0编译后出现不了窗口，是什么问题