在与 Ben Voigt 讨论了一下之后，我决定在不使用 System.Diagnostics.Process 的情况下实现与进程的通信。这是我现在想出的，它运行良好，即每次都能持续运行，没有任何阻塞或挂起。
我发布此内容是因为这可能会帮助任何需要从 stdout/stderr 读取并在没有 System.Diagnostics.Process 的情况下写入某些已创建进程的标准输入的人。
const UInt32 STARTF_USESTDHANDLES = 0x00000100;
const int HANDLE_FLAG_INHERIT = 1;
struct PROCESS_INFORMATION
{
public IntPtr hProcess;
public IntPtr hThread;
public uint dwProcessId;
public uint dwThreadId;
}
struct STARTUPINFO
{
public uint cb;
public string lpReserved;
public string lpDesktop;
public string lpTitle;
public uint dwX;
public uint dwY;
public uint dwXSize;
public uint dwYSize;
public uint dwXCountChars;
public uint dwYCountChars;
public uint dwFillAttribute;
public uint dwFlags;
public short wShowWindow;
public short cbReserved2;
public IntPtr lpReserved2;
public IntPtr hStdInput;
public IntPtr hStdOutput;
public IntPtr hStdError;
}
struct SECURITY_ATTRIBUTES
{
public int length;
public IntPtr lpSecurityDescriptor;
[MarshalAs(UnmanagedType.Bool)]
public bool bInheritHandle;
}
[DllImport("kernel32.dll")]
static extern bool CreateProcess(string lpApplicationName,
string lpCommandLine,
IntPtr lpProcessAttributes,
IntPtr lpThreadAttributes,
bool bInheritHandles,
uint dwCreationFlags,
IntPtr lpEnvironment,
string lpCurrentDirectory,
ref STARTUPINFO lpStartupInfo,
out PROCESS_INFORMATION lpProcessInformation);
[DllImport("kernel32.dll", SetLastError = true)]
static extern bool CloseHandle(IntPtr hObject);
[DllImport("kernel32.dll", SetLastError = true)]
static extern bool CreatePipe(out IntPtr hReadPipe,
out IntPtr hWritePipe,
ref SECURITY_ATTRIBUTES lpPipeAttributes,
uint nSize);
[DllImport("kernel32", SetLastError = true)]
static extern unsafe bool ReadFile(IntPtr hFile,
void* pBuffer,
int NumberOfBytesToRead,
int* pNumberOfBytesRead,
IntPtr lpOverlapped);
[DllImport("kernel32.dll")]
static extern unsafe bool WriteFile(IntPtr hFile,
void* pBuffer,
int nNumberOfBytesToWrite,
int* lpNumberOfBytesWritten,
IntPtr lpOverlapped);
[DllImport("kernel32.dll")]
static extern bool SetHandleInformation(IntPtr hObject, int dwMask, uint dwFlags);
void OpenAndCloseFcsh()
{
STARTUPINFO si = new STARTUPINFO();
SECURITY_ATTRIBUTES sa = new SECURITY_ATTRIBUTES();
PROCESS_INFORMATION pi = new PROCESS_INFORMATION();
sa.bInheritHandle = true;
sa.lpSecurityDescriptor = IntPtr.Zero;
sa.length = Marshal.SizeOf(typeof(SECURITY_ATTRIBUTES));
sa.lpSecurityDescriptor = IntPtr.Zero;
IntPtr h_stdout_r, h_stdout_w;
if (!CreatePipe(out h_stdout_r, out h_stdout_w, ref sa, 0))
throw new Exception("bad");
if (!SetHandleInformation(h_stdout_r, HANDLE_FLAG_INHERIT, 0))
throw new Exception("bad");
IntPtr h_stdin_r, h_stdin_w;
if (!CreatePipe(out h_stdin_r, out h_stdin_w, ref sa, 0))
throw new Exception("bad");
if (!SetHandleInformation(h_stdin_w, HANDLE_FLAG_INHERIT, 0))
throw new Exception("bad");
si.wShowWindow = 0;
si.cb = (uint)Marshal.SizeOf(si);
si.dwFlags |= STARTF_USESTDHANDLES;
si.hStdOutput = h_stdout_w;
si.hStdError = h_stdout_w;
si.hStdInput = h_stdin_r;
string command = @"C:\flex_sdks\flex_sdk_4.5.1.21328_trimmed\bin\fcsh.exe";
if (!CreateProcess(command, null, IntPtr.Zero, IntPtr.Zero, true, 0, IntPtr.Zero, null, ref si, out pi))
throw new Exception("bad");
Console.WriteLine("Process ID (PID): " + pi.dwProcessId);
Console.WriteLine("Process Handle : " + pi.hProcess);
// ****************************************************
// let's interact with our process
// first read to the prompt
Console.WriteLine("read this from fcsh.exe:\r\n" + ReadTillPrompt(h_stdout_r));
// write "help" to stdin
byte[] bytes_to_write = Encoding.UTF8.GetBytes("help\r\n");
Write(h_stdin_w, bytes_to_write, 0, bytes_to_write.Length);
// then read to the prompt again
Console.WriteLine("read this from fcsh.exe:\r\n" + ReadTillPrompt(h_stdout_r));
// write "quit" to stdin
bytes_to_write = Encoding.UTF8.GetBytes("quit\r\n");
Write(h_stdin_w, bytes_to_write, 0, bytes_to_write.Length);
// ****************************************************
if (!CloseHandle(pi.hProcess))
throw new Exception("bad");
if (!CloseHandle(pi.hThread))
throw new Exception("bad");
if (!CloseHandle(h_stdout_w))
throw new Exception("bad");
if (!CloseHandle(h_stdin_w))
throw new Exception("bad");
}
public string ReadTillPrompt(IntPtr h_stdout_r)
{
StringBuilder sb = new StringBuilder(1024);
byte[] buffer = new byte[128];
int nb_bytes_read;
while (true) {
nb_bytes_read = Read(h_stdout_r, buffer, 0, buffer.Length);
sb.Append(Encoding.UTF8.GetString(buffer, 0, nb_bytes_read));
if (sb.ToString().EndsWith("\n(fcsh) "))
break;
Thread.Sleep(20);
}
return sb.ToString();
}
public unsafe int Read(IntPtr h, byte[] buffer, int index, int count)
{
int n = 0;
fixed (byte* p = buffer) {
if (!ReadFile(h, p + index, count, &n, IntPtr.Zero))
throw new Exception("bad");
}
return n;
}
public unsafe int Write(IntPtr h, byte[] buffer, int index, int count)
{
int n = 0;
fixed (byte* p = buffer) {
if (!WriteFile(h, p + index, count, &n, IntPtr.Zero))
throw new Exception("bad");
}
return n;
}