C++/CLI版本（使用时需要#include "Cmd.h"）

Cmd.cpp：

#include "StdAfx.h"
#include "Cmd.h"

Cmd.h：

#pragma once

#include <vcclr.h>
#include <windows.h>
#pragma comment(lib, "kernel32.lib")

using namespace System;
using namespace System::IO;
using namespace System::Text;
using namespace System::Runtime::InteropServices;
using namespace System::ComponentModel;

public ref class Cmd
{
public:
	Cmd()
	{
	}

	static String^ RunCmd(String^ cmd)
	{
		String ^tmpname = Path::GetTempFileName();
		pin_ptr<const wchar_t> p_tmpname = PtrToStringChars(tmpname);
		
		SECURITY_ATTRIBUTES sa = { sizeof sa };
		sa.bInheritHandle = TRUE;

		HANDLE outhandle = CreateFile(p_tmpname, GENERIC_WRITE, FILE_SHARE_READ, &sa, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);
		if (outhandle == INVALID_HANDLE_VALUE)
		{
			throw gcnew Win32Exception(GetLastError());
		}

		HANDLE outhandle2 = INVALID_HANDLE_VALUE;
		if (!DuplicateHandle(GetCurrentProcess(), outhandle, GetCurrentProcess(), &outhandle2, 0, TRUE, DUPLICATE_SAME_ACCESS))
		{
			DWORD errcode = GetLastError();
			CloseHandle(outhandle);
			throw gcnew Win32Exception(errcode);
		}

		WCHAR *p_cmd = (WCHAR *)Marshal::StringToHGlobalUni(cmd).ToPointer();

		STARTUPINFO si = { sizeof si };
		si.dwFlags = STARTF_USESTDHANDLES | STARTF_USESHOWWINDOW;
		si.hStdInput = INVALID_HANDLE_VALUE;
		si.hStdOutput = outhandle;
		si.hStdError = outhandle2;
		si.wShowWindow = SW_HIDE;

		PROCESS_INFORMATION pi = { 0 };

		if (!CreateProcess(NULL, p_cmd, NULL, NULL, TRUE, 0, NULL, NULL, &si, &pi))
		{
			DWORD errcode = GetLastError();
			CloseHandle(outhandle);
			CloseHandle(outhandle2);
			Marshal::FreeHGlobal(IntPtr(p_cmd));
			throw gcnew Win32Exception();
		}

		Marshal::FreeHGlobal(IntPtr(p_cmd));
		CloseHandle(pi.hThread);
		CloseHandle(outhandle);
		CloseHandle(outhandle2);

		if (WaitForSingleObject(pi.hProcess, INFINITE) == WAIT_FAILED)
		{
			DWORD errcode = GetLastError();
			CloseHandle(pi.hProcess);
			throw gcnew Win32Exception(errcode);
		}

		CloseHandle(pi.hProcess);
		
		String ^outstr = File::ReadAllText(tmpname, Encoding::Default);

		File::Delete(tmpname);

		return outstr;
	}
};
</const></windows.h></vcclr.h>