[英]Connection to named pipe
我尝试在 C++ 中使用命名管道将消息从一台计算机传输到另一台计算机。 但是客户端无法连接到服务器,它返回错误 1326(无效的名称或密码),尽管服务器名称指定正确。
密码和频道有什么关系? 如果代码中没有错误,那么还有什么可能导致通道连接错误?
另外,我在网上看到这样的表格记录了频道名\\servername\pipe\[path] pipename
。 servername
是服务器的名字, pipe
判断是频道, pipename
是频道的名字,但是[path]
是什么?
服务器
#include <windows.h>
#include <iostream>
#include <cstring>
using namespace std;
int main()
{
HANDLE hNamedPipe;
DWORD dwBytesRead;
DWORD dwBytesWrite;
char pchMessage[80];
int nMessageLength;
PSECURITY_DESCRIPTOR psd;
SECURITY_ATTRIBUTES sa;
psd = (PSECURITY_DESCRIPTOR)LocalAlloc(LPTR, SECURITY_DESCRIPTOR_MIN_LENGTH);
InitializeSecurityDescriptor(psd, SECURITY_DESCRIPTOR_REVISION);
SetSecurityDescriptorDacl(psd, true, NULL, false);
sa.nLength = sizeof(sa);
sa.bInheritHandle = true;
sa.lpSecurityDescriptor = psd;
hNamedPipe= CreateNamedPipe("\\\\.\\pipe\\pipe", PIPE_ACCESS_DUPLEX | FILE_FLAG_OVERLAPPED | WRITE_OWNER, PIPE_READMODE_MESSAGE | PIPE_TYPE_MESSAGE| PIPE_ACCEPT_REMOTE_CLIENTS, PIPE_UNLIMITED_INSTANCES, 2048, 2048, INFINITE, &sa);
if (hNamedPipe == INVALID_HANDLE_VALUE)
{
cerr << "Create named pipe failed." << endl
<< "The last error code: " << GetLastError() << endl;
cout << "Press any key to exit.";
cin.get();
return 0;
}
cout << "The server is waiting for connection with a client." << endl;
if (!ConnectNamedPipe(
hNamedPipe,
NULL
))
{
cerr << "Connect named pipe failed." << endl
<< "The last error code: " << GetLastError() << endl;
CloseHandle(hNamedPipe);
cout << "Press any key to exit.";
cin.get();
return 0;
}
if (!ReadFile(
hNamedPipe,
pchMessage,
sizeof(pchMessage),
&dwBytesRead,
NULL))
{
cerr << "Data reading from the named pipe failed." << endl
<< "The last error code: " << GetLastError() << endl;
CloseHandle(hNamedPipe);
cout << "Press any key to exit.";
cin.get();
return 0;
}
cout << "The server received the message from a client: "
<< endl << '\t' << pchMessage << endl;
cout << "Input a string: ";
cin.getline(pchMessage, 80);
nMessageLength = strlen(pchMessage) + 1;
if (!WriteFile(
hNamedPipe,
pchMessage,
nMessageLength,
&dwBytesWrite,
NULL
))
{
cerr << "Write file failed." << endl
<< "The last error code: " << GetLastError() << endl;
CloseHandle(hNamedPipe);
cout << "Press any key to exit.";
cin.get();
return 0;
}
cout << "The server sent the message to a client: "
<< endl << '\t' << pchMessage << endl;
CloseHandle(hNamedPipe);
cout << "Press any key to exit.";
cin.get();
return 0;
}
客户
#include <windows.h>
#include <iostream>
#include <string>
using namespace std;
int main()
{
string machineName;
getline(cin, machineName, '\n');
machineName= "\\\\"+machineName+"\\pipe\\pipe";
cout << machineName << endl;
char pipeName[80];
strcpy_s(pipeName, machineName.c_str());
HANDLE hNamedPipe;
DWORD dwBytesWritten;
DWORD dwBytesRead;
char pchMessage[80];
int nMessageLength;
hNamedPipe = CreateFile(
pipeName, // имя канала
GENERIC_READ | GENERIC_WRITE,
FILE_SHARE_READ | FILE_SHARE_WRITE,
NULL,
OPEN_EXISTING,
FILE_ATTRIBUTE_NORMAL,
NULL);
if (hNamedPipe == INVALID_HANDLE_VALUE)
{
cerr << "Connection with the named pipe failed." << endl
<< "The last error code: " << GetLastError() << endl;
cout << "Press any key to exit.";
cin.get();
return 0;
}
cin.get();
cout << "Input a string: ";
cin.getline(pchMessage, 80);
nMessageLength = strlen(pchMessage) + 1;
if (!WriteFile(
hNamedPipe,
pchMessage,
nMessageLength,
&dwBytesWritten,
NULL))
{
cerr << "Write file failed: " << endl
<< "The last error code: " << GetLastError() << endl;
CloseHandle(hNamedPipe);
cout << "Press any key to exit.";
cin.get();
return 0;
}
cout << "The client sent the message to a server: "
<< endl << '\t' << pchMessage << endl;
if (!ReadFile(
hNamedPipe,
pchMessage,
sizeof(pchMessage),
&dwBytesRead,
NULL))
{
cerr << "Read file failed: " << endl
<< "The last error code: " << GetLastError() << endl;
CloseHandle(hNamedPipe);
cout << "Press any key to exit.";
cin.get();
return 0;
}
cout << "The client received the message from a server: "
<< endl << '\t' << pchMessage << endl;
CloseHandle(hNamedPipe);
cout << "Press any key to exit.";
cin.get();
return 0;
}
经过我的测试,您的代码中有两个地方需要更正。
&sa
替换为NULL
,Remy 指出了原因。NetUseAdd function 在本地计算机和远程服务器之间建立连接。 您可以指定要连接的本地驱动器号或打印机设备。 如果您未指定本地驱动器号或打印机设备,function 将向服务器验证客户端以供将来连接。
此外,需要打开file and print sharing
。
一切配置好后,代码就可以正常工作了。
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