Named Pipes Client Error 5 (C++) - c++

Question

Ok so below I have the code for named pipe server/client. I have the server placed on my Windows 8 computer and it creates a pipe and then waits for the client to connect. Then I start the client on my Windows 7 but it returns error 5 (Access denied, I think??) Can someone explain to me why it is giving me error 5 please?
Thnx in advance for all the answers
Server Code
#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();
}
Client Code
#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();
}

Answer 1

Configure both computers by adding ip address, subnet mask, default gateway. From Network and Sharing Center, turn on all sharing and turn off password protected sharing. Test it by pinging ip address from cmd. User account of the both computers should not be password protected. That's why i fixed the Client Error 5 and set up named pipe communication between two remote computers

Answer 2

The client should use OpenFile(), not CreateFile(). The client doesn't want to create anything new, it wants to talk to an existing pipe.