您好我已经在Windows环境中的c3和cpp中开发了示例应用程序。此应用程序实现这些程序之间的命名管道进行通信。我的cpp程序中有[DllImport("kernel32.dll", SetLastError = true)]命令。当我编译我的c＃progaram我得到以下错误。
Enter the message
Unhandled Exception: Unhandled Exception: System.DllNotFoundException: Unable to load DLL 'kernel32.dll': The specified module or one of its dependencies could not be found.
(Exception from HRESULT: 0x8007007E)
at consoleapp.NamedPipeServer.CreateNamedPipe(String pipeName, UInt32 dwOpenMode, UInt32 dwPipeMode, UInt32 nMaxInstances, UInt32 nOutBufferSize, UInt32 nInBufferSize, UInt32 nDefaultTimeOut, IntPtr lpSecurityAttributes)
at consoleapp.NamedPipeServer.ListenForClients() in /home/niranjan/consoleapp/NamedPipeServer.cs:line 66
at System.Threading.Thread.ThreadMain_ThreadStart()
at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state)System.DllNotFoundException: Unable to load DLL 'kernel32.dll': The specified module or one of its dependencies could not be found.
(Exception from HRESULT: 0x8007007E)
at consoleapp.NamedPipeServer.CreateNamedPipe(String pipeName, UInt32 dwOpenMode, UInt32 dwPipeMode, UInt32 nMaxInstances, UInt32 nOutBufferSize, UInt32 nInBufferSize, UInt32 nDefaultTimeOut, IntPtr lpSecurityAttributes)
at consoleapp.NamedPipeServer.ListenForClients() in /home/niranjan/consoleapp/NamedPipeServer.cs:line 66
at System.Threading.Thread.ThreadMain_ThreadStart()
at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state)
下面是我的c＃文件。我在ubuntu中创建了.Net core（2.0）控制台应用程序。 Program.cs的
using System;
namespace consoleapp
{
class Program
{
static void Main(string[] args)
{
Console.WriteLine("Hello World!");
NamedPipeServer PServer1 = new NamedPipeServer(@"\\.\pipe\myNamedPipe1",0);
NamedPipeServer PServer2 = new NamedPipeServer(@"\\.\pipe\myNamedPipe2",1);
PServer1.Start();
PServer2.Start();
string Ms="Start";
do
{
Console.WriteLine("Enter the message");
Ms = Console.ReadLine();
PServer2.SendMessage(Ms, PServer2.clientse);
} while (Ms != "quit");
PServer1.StopServer();
PServer2.StopServer();
}
}
}
以下是我的NamedPipeServer.cs
using System;
using Microsoft.Win32.SafeHandles;
using System.Text;
using System.Runtime.InteropServices;
using System.Threading;
using System.IO;
namespace consoleapp
{
public class NamedPipeServer
{
[DllImport("kernel32.dll", SetLastError = true)]
public static extern SafeFileHandle CreateNamedPipe(
String pipeName,
uint dwOpenMode,
uint dwPipeMode,
uint nMaxInstances,
uint nOutBufferSize,
uint nInBufferSize,
uint nDefaultTimeOut,
IntPtr lpSecurityAttributes);
[DllImport("kernel32.dll", SetLastError = true)]
public static extern int ConnectNamedPipe(
SafeFileHandle hNamedPipe,
IntPtr lpOverlapped);
[DllImport("kernel32.dll", SetLastError = true)]
public static extern int DisconnectNamedPipe(
SafeFileHandle hNamedPipe);
public const uint DUPLEX = (0x00000003);
public const uint FILE_FLAG_OVERLAPPED = (0x40000000);
public class Client
{
public SafeFileHandle handle;
public FileStream stream;
}
public const int BUFFER_SIZE = 100;
public Client clientse =null;
public string pipeName;
Thread listenThread;
SafeFileHandle clientHandle;
public int ClientType;
public NamedPipeServer(string PName,int Mode)
{
pipeName = PName;
ClientType = Mode;//0 Reading Pipe, 1 Writing Pipe
}
public void Start()
{
this.listenThread = new Thread(new ThreadStart(ListenForClients));
this.listenThread.Start();
}
private void ListenForClients()
{
while (true)
{
clientHandle =CreateNamedPipe(this.pipeName,DUPLEX | FILE_FLAG_OVERLAPPED,0,255,BUFFER_SIZE,BUFFER_SIZE,0,IntPtr.Zero);
//could not create named pipe
if (clientHandle.IsInvalid)
return;
int success = ConnectNamedPipe(clientHandle, IntPtr.Zero);
//could not connect client
if (success == 0)
return;
clientse = new Client();
clientse.handle = clientHandle;
clientse.stream = new FileStream(clientse.handle, FileAccess.ReadWrite, BUFFER_SIZE, true);
if (ClientType == 0)
{
Thread readThread = new Thread(new ThreadStart(Read));
readThread.Start();
}
}
}
private void Read()
{
//Client client = (Client)clientObj;
//clientse.stream = new FileStream(clientse.handle, FileAccess.ReadWrite, BUFFER_SIZE, true);
byte[] buffer = null;
ASCIIEncoding encoder = new ASCIIEncoding();
while (true)
{
int bytesRead = 0;
try
{
buffer = new byte[BUFFER_SIZE];
bytesRead = clientse.stream.Read(buffer, 0, BUFFER_SIZE);
}
catch
{
//read error has occurred
break;
}
//client has disconnected
if (bytesRead == 0)
break;
//fire message received event
//if (this.MessageReceived != null)
// this.MessageReceived(clientse, encoder.GetString(buffer, 0, bytesRead));
int ReadLength = 0;
for (int i = 0; i < BUFFER_SIZE; i++)
{
if (buffer[i].ToString("x2") != "cc")
{
ReadLength++;
}
else
break;
}
if (ReadLength > 0)
{
byte[] Rc = new byte[ReadLength];
Buffer.BlockCopy(buffer, 0, Rc, 0, ReadLength);
Console.WriteLine("C# App: Received " + ReadLength +" Bytes: "+ encoder.GetString(Rc, 0, ReadLength));
buffer.Initialize();
}
}
//clean up resources
clientse.stream.Close();
clientse.handle.Close();
}
public void SendMessage(string message, Client client)
{
ASCIIEncoding encoder = new ASCIIEncoding();
byte[] messageBuffer = encoder.GetBytes(message);
if (client.stream.CanWrite)
{
client.stream.Write(messageBuffer, 0, messageBuffer.Length);
client.stream.Flush();
}
}
public void StopServer()
{
//clean up resources
DisconnectNamedPipe(this.clientHandle);
this.listenThread.Abort();
}
}
}
下面是我的cpp程序。
#include <stdio.h>
#include <windows.h>
unsigned long __stdcall NET_RvThr(void * pParam) ;
DWORD WINAPI ThreadProc() ;
HANDLE hPipe1,hPipe2;
BOOL Finished;
int main(int argc, char *argv[])
{
//Pipe Init Data
char buf[100];
LPTSTR lpszPipename1 = TEXT("\\\\.\\pipe\\myNamedPipe1");
LPTSTR lpszPipename2 = TEXT("\\\\.\\pipe\\myNamedPipe2");
DWORD cbWritten;
DWORD dwBytesToWrite = (DWORD)strlen(buf);
//Thread Init Data
DWORD threadId;
HANDLE hThread = NULL;
BOOL Write_St=TRUE;
Finished=FALSE;
hPipe1=CreateFile(lpszPipename1, GENERIC_WRITE ,0,NULL,OPEN_EXISTING,FILE_FLAG_OVERLAPPED,NULL);
hPipe2=CreateFile(lpszPipename2, GENERIC_READ ,0,NULL,OPEN_EXISTING,FILE_FLAG_OVERLAPPED,NULL);
if ((hPipe1 == NULL || hPipe1 == INVALID_HANDLE_VALUE)||(hPipe2 == NULL || hPipe2 == INVALID_HANDLE_VALUE))
{
printf("Could not open the pipe - (error %d)\n",GetLastError());
}
else
{
hThread = CreateThread( NULL, 0, &NET_RvThr, NULL, 0, NULL);
do
{
printf ("Enter your message: ");
scanf ("%s",buf);
if (strcmp (buf,"quit") == 0)
Write_St=FALSE;
else
{
WriteFile(hPipe1, buf, dwBytesToWrite, &cbWritten, NULL);
memset(buf,0xCC,100);
}
}while(Write_St);
CloseHandle(hPipe1);
CloseHandle(hPipe2);
Finished=TRUE;
}
getchar();
}
unsigned long __stdcall NET_RvThr(void * pParam) {
BOOL fSuccess;
char chBuf[100];
DWORD dwBytesToWrite = (DWORD)strlen(chBuf);
DWORD cbRead;
int i;
while(1)
{
fSuccess =ReadFile( hPipe2,chBuf,dwBytesToWrite,&cbRead, NULL);
if(fSuccess)
{
printf("C++ App: Received %d Bytes : ",cbRead);
for(i=0;i<cbRead;i++)
printf("%c",chBuf[i]);
printf("\n");
}
if (! fSuccess && GetLastError() != ERROR_MORE_DATA)
{
printf("Can't Read\n");
if(Finished)
break;
}
}
}
我试图弄清楚ubuntu相当于kernal32.dll。有人可以帮我解决这个问题吗？任何帮助将不胜感激。谢谢。
答案 0 :(得分：1)
Ubuntu中的kernel32.dll相当于什么？
Kernel32.dll是一个特定于Windows的库。您不会在其他操作系统（如Ubuntu）上找到它（除非您使用一些仿真层，如Wine）。因此，您无法在Ubuntu上使用特定于平台的代码。
那么，我如何以独立于平台的方式使用命名管道？
幸运的是，.NET Framework设计人员为您解决了这个问题：.NET Core 2.0包含System.IO.Pipes Namespace，其中包含通过命名管道进行进程间通信的托管包装。