C++使用Windows命名管道

由於某些原因，桅杆和從屬裝置都失敗了，但是我可以找到任何關於它們如何工作的好例子，所以我不知道我出錯的地方。C++使用Windows命名管道

Master從不退出ConnectNamedPipe後的WaitForSingleObject，並且slave在第一次boost :: asio :: read調用中拋出異常，「等待進程打開管道的另一端」，我通過WaitNamedPipe是否意味着要與主控器中的ConnectNamedPipe一起等待？

master.cpp

asio::io_service ioservice; 
asio::windows::stream_handle in(ioservice); 
int main() 
{ 
    HANDLE pipe = INVALID_HANDLE_VALUE; 
    try 
    { 
     //create pipe 
     pipe = CreateNamedPipe("\\\\.\\pipe\\FLTest", 
      PIPE_ACCESS_DUPLEX | FILE_FLAG_FIRST_PIPE_INSTANCE | FILE_FLAG_OVERLAPPED, 
      PIPE_TYPE_BYTE | PIPE_READMODE_BYTE, 
      255, 50000,50000, 0, 0); 
     if(pipe == INVALID_HANDLE_VALUE) 
     { 
      printWinError(); 
      return -1; 
     } 
     in.assign(pipe); 
     std::cout << "Created pipe" << std::endl; 
     //spawn child 
     STARTUPINFO   startInfo; 
     ZeroMemory(&startInfo, sizeof(STARTUPINFO)); 
     startInfo.cb = sizeof(STARTUPINFO); 
     PROCESS_INFORMATION procInfo; 
     ZeroMemory(&procInfo, sizeof(PROCESS_INFORMATION)); 
     if(CreateProcess(0, "slave.exe", 0,0, FALSE, CREATE_NEW_CONSOLE, 
      0, 0, &startInfo, &procInfo)) 
     { 
      std::cout << "Slave process created" << std::endl; 
     } 
     else 
     { 
      printWinError(); 
      DisconnectNamedPipe(pipe); 
      return -1; 
     } 

     OVERLAPPED overlapped = {0}; 
     overlapped.hEvent = CreateEvent(0,TRUE,FALSE,0); 
     if(ConnectNamedPipe(pipe, &overlapped) == FALSE) 
     { 
      unsigned error = GetLastError(); 
      if(error != ERROR_PIPE_CONNECTED && 
       error != ERROR_IO_PENDING) 
      { 
       printWinError(); 
       DisconnectNamedPipe(pipe); 
       return -1; 
      } 
     } 
     WaitForSingleObject(overlapped.hEvent, INFINITE); 
     CloseHandle(overlapped.hEvent); 
     std::cout << "Pipe connected" << std::endl; 

     for(int i = 0; i < 100; ++i) 
     { 
      boost::system::error_code error; 
      unsigned n = i * 5; 
      asio::write(in,asio::buffer((char*)&n, sizeof(unsigned)), 
       asio::transfer_all(), error); 
      if(error)throw boost::system::system_error(error); 
     } 
     std::cout << "Sent data" << std::endl; 

     FlushFileBuffers(pipe); 
     DisconnectNamedPipe(pipe); 
     system("pause"); 
     return 0; 
    } 
    catch(const std::exception &e) 
    { 
     std::cout << e.what() << std::endl; 
     if(pipe != INVALID_HANDLE_VALUE) 
      DisconnectNamedPipe(pipe); 
     system("pause"); 
     return -1; 
    } 
}

slave.cpp

asio::io_service ioservice; 
asio::windows::stream_handle in(ioservice); 
int main() 
{ 
    try 
    { 
     WaitNamedPipe("\\\\.\\pipe\\FLTest", NMPWAIT_WAIT_FOREVER); 

     std::cout << "Pipe avaible" << std::endl; 
     HANDLE pipe = CreateNamedPipe("\\\\.\\pipe\\FLTest", 
      PIPE_ACCESS_DUPLEX | FILE_FLAG_OVERLAPPED, 
      PIPE_TYPE_BYTE | PIPE_READMODE_BYTE, 
      255, 50000,50000,0,0); 
     if(pipe == INVALID_HANDLE_VALUE) 
     { 
      printWinError(); 
      return -1; 
     } 

     in.assign(pipe); 
     std::cout << "Pipe connected" << std::endl; 

     for(int i = 0; i < 100; ++i) 
     { 
      std::cout << "i: " << i << std::endl; 
      boost::system::error_code error; 
      unsigned n; 
      asio::read(in,asio::buffer((char*)&n,sizeof(unsigned)), 
       asio::transfer_all(), error); 
      if(error)throw boost::system::system_error(error); 
     } 
     system("pause"); 
     return 0; 
    } 
    catch(const std::exception &e) 
    { 
     std::cout << e.what() << std::endl; 
     system("pause"); 
     return -1; 
    } 
}

顯然香港專業教育學院得到的東西完全錯誤的，但我不能在網絡上找到任何與比較我的代碼。

來源

2009-08-06 Fire Lancer

在你的奴隸，你需要調用的CreateFile（）打開的管道，而不是CreateNamedPipe時。

HANDLE pipe = CreateFile("\\\\.\\pipe\\FLTest",     
     GENERIC_READ | GENERIC_WRITE,    
     0,           
     NULL,          
     OPEN_EXISTING,        
     FILE_FLAG_OVERLAPPED,      
     NULL 
    );

來源

2009-08-06 04:22:05 sylvanaar

您需要在服務器部分中指定管道的模式PIPE_WAIT

來源

2009-08-06 02:54:47 steve

C++使用Windows命名管道

回答

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