Pipe.cpp

[詳解]

// ----------------------------------------------------------------------------
 
#include "pch.h"
#include "Pipe.h"
 
using namespace alt;
 
Pipe::Pipe ()
{
    _hRead = INVALID_HANDLE_VALUE;
    _hWrite = INVALID_HANDLE_VALUE;
}
 
Pipe::~Pipe ()
{
    this->Close ();
}
 
BOOL Pipe::Create ()
{
    SECURITY_ATTRIBUTES sa = { 0, 0, 0 };
    sa.nLength = sizeof (SECURITY_ATTRIBUTES);
    sa.bInheritHandle = TRUE;
    sa.lpSecurityDescriptor = NULL;
 
    return ::CreatePipe (&_hRead, &_hWrite, &sa, 0);
}
 
DWORD Pipe::Peek (LPVOID lpvBuf, DWORD dwSize) const
{
    DWORD dwReadSize;
    DWORD dwAvail;
    DWORD dwLeft;
 
    BOOL ret = ::PeekNamedPipe (
        _hRead, lpvBuf, dwSize, &dwReadSize, &dwAvail, &dwLeft);
 
    return ret == TRUE ? dwReadSize : -1;
}
 
DWORD Pipe::Read (LPVOID lpvBuf, DWORD dwSize) const
{
    DWORD dwReadSize;
 
    BOOL ret = ::ReadFile (_hRead, lpvBuf, dwSize, &dwReadSize, NULL);
 
    return ret == TRUE ? dwReadSize : -1;
}
 
BOOL Pipe::Write (LPVOID lpvBuf, DWORD dwSize) const
{
    DWORD dwWrittenSize;
 
    BOOL ret = ::WriteFile (_hWrite, lpvBuf, dwSize, &dwWrittenSize, NULL);
 
    return ret == TRUE ? dwWrittenSize : -1;
}
 
BOOL Pipe::Close ()
{
    BOOL ret1 = ::CloseHandle (_hRead);
    _hRead = INVALID_HANDLE_VALUE;
    BOOL ret2 = ::CloseHandle (_hWrite);
    _hWrite = INVALID_HANDLE_VALUE;
 
    return ret1 == TRUE && ret2 == TRUE ? TRUE : FALSE;
}