创建命名管道时出现get GLE=5(拒绝访问)错误

我已尝试创建命名管道,但获得了GLE 5(拒绝访问错误)

#include <windows.h> 
#include <stdio.h>
#include <conio.h>
#include <tchar.h>
#include "iostream.h"

//#define PIPE_ACCESS_DUPLEX 0x00000003
//#define PIPE_ACCESS_INBOUND 0x00000001
//#define PIPE_ACCESS_OUTBOUND 0x00000002
#define BUFSIZE 512

int main()
{
    HANDLE hPipe;
    LPTSTR lpszPipename = TEXT("\\\\.\\pipe\\mynamedpipe"); 
    hPipe=CreateNamedPipe(lpszPipename,PIPE_ACCESS_DUPLEX | FILE_FLAG_OVERLAPPED,PIPE_TYPE_BYTE | PIPE_READMODE_BYTE | PIPE_WAIT,PIPE_UNLIMITED_INSTANCES,BUFSIZE,BUFSIZE,0,NULL);

    if (hPipe != INVALID_HANDLE_VALUE) 
        cout<<"Valid";


      if (GetLastError() != ERROR_PIPE_BUSY) 
      {
         printf( TEXT("Could not open pipe. GLE=%d\n"), GetLastError() ); 
         return -1;
      }

    return 0;
}