[ROSAUTOTEST]

- Abstract unidirectional anonymous pipes into a CPipe class
- Abstract a process with redirected output into a CPipedProcess class
- Use these abstractions to avoid polling for output from test processes. Instead, use blocking read operations to yield the CPU while waiting for data.
ROSTESTS-144 #resolve

svn path=/trunk/; revision=66316

rostests/rosautotest/CPipedProcess.cpp

@@ -0,0 +1,42 @@
+/*
+ * PROJECT:     ReactOS Automatic Testing Utility
+ * LICENSE:     GNU GPLv2 or any later version as published by the Free Software Foundation
+ * PURPOSE:     Class that creates a process and redirects its output to a pipe
+ * COPYRIGHT:   Copyright 2015 Thomas Faber <thomas.faber@reactos.org>
+ */
+
+#include "precomp.h"
+
+/**
+ * Constructs a CPipedProcess object and starts the process with redirected output.
+ *
+ * @param CommandLine
+ * A std::wstring containing the command line to run.
+ *
+ * @param Pipe
+ * The CPipe instance to redirect the process's output to.
+ * Note that only the read pipe is usable after the pipe was passed to this object.
+ */
+CPipedProcess::CPipedProcess(const wstring& CommandLine, CPipe& Pipe)
+    : CProcess(CommandLine, InitStartupInfo(Pipe))
+{
+    Pipe.CloseWritePipe();
+}
+
+/**
+ * Initializes the STARTUPINFO structure for use in CreateProcessW.
+ *
+ * @param Pipe
+ * The CPipe instance to redirect the process's output to.
+ */
+LPSTARTUPINFOW
+CPipedProcess::InitStartupInfo(CPipe& Pipe)
+{
+    ZeroMemory(&m_StartupInfo, sizeof(m_StartupInfo));
+    m_StartupInfo.cb = sizeof(m_StartupInfo);
+    m_StartupInfo.dwFlags = STARTF_USESTDHANDLES;
+    m_StartupInfo.hStdInput  = GetStdHandle(STD_INPUT_HANDLE);
+    m_StartupInfo.hStdOutput = Pipe.m_hWritePipe;
+    m_StartupInfo.hStdError  = Pipe.m_hWritePipe;
+    return &m_StartupInfo;
+}