命名管道客户端错误5 (c++)

好的，下面我有命名管道服务器/客户端的代码。我把服务器放在我的Windows 8电脑上，它创建了一个管道，然后等待客户端连接。然后我在Windows 7上启动客户端，但它返回错误5(访问被拒绝，我想??)有人能告诉我为什么它给我错误5吗?

提前感谢所有的答案

#include "stdafx.h"
#include "windows.h"
#include <iostream> 
using namespace std; 
#define g_szPipeName "\\.\pipe\pipename"  //Name given to the pipe

#define BUFFER_SIZE 1024 //1k
#define ACK_MESG_RECV "Message received successfully"
#define _CRT_SECURE_NO_WARNINGS 

HANDLE hPipe;
int repeate() {
    char szBuffer[BUFFER_SIZE];
    DWORD cbBytes;
    //We are connected to the client.
    //To communicate with the client we will use ReadFile()/WriteFile() 
    //on the pipe handle - hPipe
    //Read client message
    BOOL bResult = ReadFile(
        hPipe,                // handle to pipe 
        szBuffer,             // buffer to receive data 
        sizeof(szBuffer),     // size of buffer 
        &cbBytes,             // number of bytes read 
        NULL);                // not overlapped I/O 
    if ((!bResult) || (0 == cbBytes))
    {
        printf("nError occurred while reading from the client: %d", GetLastError());
        CloseHandle(hPipe);
        system("Pause");
        return 1;  //Error
    }
    else
    {
        printf("nReadFile() was successful.");
    }
    printf("nClient sent the following message: %s", szBuffer);
    strcpy(szBuffer, ACK_MESG_RECV);
    //Reply to client
    bResult = WriteFile(
        hPipe,                // handle to pipe 
        szBuffer,             // buffer to write from 
        strlen(szBuffer) + 1,   // number of bytes to write, include the NULL 
        &cbBytes,             // number of bytes written 
        NULL);                // not overlapped I/O 
    if ((!bResult) || (strlen(szBuffer) + 1 != cbBytes))
    {
        printf("nError occurred while writing to the client: %d", GetLastError());
        CloseHandle(hPipe);
        system("Pause");
        return 1;  //Error
    }
    else
    {
        printf("nWriteFile() was successful.");
    }
    repeate();
}

int main(int argc, char* argv[])
{
    SECURITY_DESCRIPTOR sd;
    InitializeSecurityDescriptor(&sd, SECURITY_DESCRIPTOR_REVISION);
    SECURITY_ATTRIBUTES sa;
    sa.nLength = sizeof(SECURITY_ATTRIBUTES);
    sa.lpSecurityDescriptor = &sd;

    hPipe = CreateNamedPipe(
        g_szPipeName,             // pipe name 
        PIPE_ACCESS_DUPLEX,       // read/write access 
        PIPE_TYPE_MESSAGE |       // message type pipe 
        PIPE_READMODE_MESSAGE |   // message-read mode 
        PIPE_WAIT,                // blocking mode 
        PIPE_UNLIMITED_INSTANCES, // max. instances  
        BUFFER_SIZE,              // output buffer size 
        BUFFER_SIZE,              // input buffer size 
        NMPWAIT_USE_DEFAULT_WAIT,
        &sa);


        if (INVALID_HANDLE_VALUE == hPipe)
        {
            printf("nError occurred while creating the pipe: %d", GetLastError());
            system("Pause");
            return 1;  //Error
        }
        else
        {
            printf("nCreateNamedPipe() was successful.");
        }
        printf("nWaiting for client connection...");
        //Wait for the client to connect
        BOOL bClientConnected = ConnectNamedPipe(hPipe, NULL);
        if (FALSE == bClientConnected)
        {
            printf("nError occurred while connecting to the client: %d", GetLastError());
            CloseHandle(hPipe);
            system("Pause");
            return 1;  //Error
        }
        else
        {
            printf("nConnectNamedPipe() was successful.");
        }

        repeate();
    }

#include "stdafx.h" 
#include "windows.h"
#include <iostream>
#define g_szPipeName "\\MyComputerName\pipe\pipename"  //Name given to the pipe 

#define BUFFER_SIZE 1024 //1k
#define ACK_MESG_RECV "Message received successfully"
HANDLE hPipe;
int repeate() {
    char szBuffer[BUFFER_SIZE];
    printf("nEnter a message to be sent to the server: ");
    gets(szBuffer);
    DWORD cbBytes;
    //Send the message to server
    BOOL bResult = WriteFile(
        hPipe,                // handle to pipe 
        szBuffer,             // buffer to write from 
        strlen(szBuffer) + 1,   // number of bytes to write, include the NULL
        &cbBytes,             // number of bytes written 
        NULL);                // not overlapped I/O 
    if ((!bResult) || (strlen(szBuffer) + 1 != cbBytes))
    {
        printf("nError occurred while writing to the server: %d", GetLastError());
        CloseHandle(hPipe);
        system("Pause");
        return 1;  //Error
    }
    else
    {
        printf("nWriteFile() was successful.");
    }
    //Read server response
    bResult = ReadFile(
        hPipe,                // handle to pipe 
        szBuffer,             // buffer to receive data 
        sizeof(szBuffer),     // size of buffer 
        &cbBytes,             // number of bytes read 
        NULL);                // not overlapped I/O 
    if ((!bResult) || (0 == cbBytes))
    {
        printf("nError occurred while reading from the server: %d", GetLastError());
        CloseHandle(hPipe);
        system("Pause");
        return 1;  //Error
    }
    else
    {
        printf("nReadFile() was successful.");
    }
    printf("nServer sent the following message: %s", szBuffer);
    repeate();
}
int main(int argc, char* argv[])
{

     //Connect to the server pipe using CreateFile()
     hPipe = CreateFile( 
          g_szPipeName,   // pipe name 
          GENERIC_READ |  // read and write access 
          GENERIC_WRITE, 
          0,              // no sharing 
          NULL,           // default security attributes
          OPEN_EXISTING,  // opens existing pipe 
          0,              // default attributes 
          NULL);          // no template file 
     if (INVALID_HANDLE_VALUE == hPipe) 
     {
          printf("nError occurred while connecting to the server: %d", GetLastError()); 
          //One might want to check whether the server pipe is busy
          //This sample will error out if the server pipe is busy
          //Read on ERROR_PIPE_BUSY and WaitNamedPipe() for that
          system("Pause");
          return 1;  //Error
     }
     else
     {
          printf("nCreateFile() was successful.");
     }
     //We are done connecting to the server pipe, 
     //we can start communicating with the server using ReadFile()/WriteFile() 
     //on handle - hPipe

     repeate(); 
}