/*
 * FileName: Stand_Windows_Device.cpp 
 * Author:   JarvisChu
 * Date:     2012-11-07
 */

#include <stdio.h>
#include <windows.h>

#define BUFF_SIZE 256

int main(int argc, char* argv[])
{
	DWORD nRead;
	DWORD nWrite;
	TCHAR buf[BUFF_SIZE];
     
	HANDLE hStd_Input = GetStdHandle(STD_INPUT_HANDLE);   //Get the standard input device
	HANDLE hStd_Output = GetStdHandle(STD_OUTPUT_HANDLE); //Get the standard input device
	HANDLE hStd_Error = GetStdHandle(STD_ERROR_HANDLE);   //Get the standard error device

	//read from stdinput, and write to stdoutput
	while(ReadFile(hStd_Input,buf,BUFF_SIZE,&nRead,NULL) && nRead>0)
	{
		if(!WriteFile(hStd_Output,buf,nRead,&nWrite,NULL) || nRead != nWrite)
		{

			WriteFile(hStd_Error,"WriteFile Error",sizeof(TCHAR)*15,NULL,NULL);
		}
		break; //For the purpose of testing,just read one line
	}


        //--------------------------------------------------------------------------------------------
        //Standard Input Redirection

	HANDLE hFileIn = CreateFile("in.txt",GENERIC_READ,FILE_SHARE_READ,NULL,OPEN_EXISTING,0,NULL);
	
	//the two statements below complete the redirection
	SetStdHandle(STD_INPUT_HANDLE,hFileIn);               //set the hFileIn as the standard input device
	HANDLE newStd_Input = GetStdHandle(STD_INPUT_HANDLE); //Get the standard input device，now is hFileIn

	while(ReadFile(newStd_Input,buf,BUFF_SIZE,&nRead,NULL) && nRead>0)
	{
		WriteFile(hStd_Output,buf,nRead,&nWrite,NULL);
	}
	
	SetStdHandle(STD_INPUT_HANDLE,hStd_Input);  //Reset the Standard Input Device to default


	//--------------------------------------------------------------------------------------------
        //Standard Output Redirection

	HANDLE hFileOut = CreateFile("out.txt",GENERIC_WRITE,FILE_SHARE_READ,NULL,OPEN_ALWAYS,0,NULL);
	
	//the two statements below complete the redirection
	SetStdHandle(STD_OUTPUT_HANDLE,hFileOut);               //set the hFileIn as the standard input device
	HANDLE newStd_Output = GetStdHandle(STD_OUTPUT_HANDLE); //Get the standard output device，now is hFileout
	
	while(ReadFile(hStd_Input,buf,BUFF_SIZE,&nRead,NULL) && nRead>0)
	{
		WriteFile(newStd_Output,buf,nRead,&nWrite,NULL);
		break; //For the purpose of testing,just read one line
	} 

        //Reset the Standard IO Device to default
	SetStdHandle(STD_OUTPUT_HANDLE,hStd_Output);


	//--------------------------------------------------------------------------------------------
        //Close Handles
	CloseHandle(hFileIn);
	CloseHandle(hFileOut);
	CloseHandle(hStd_Input);
	CloseHandle(hStd_Input);
	CloseHandle(newStd_Input);
	CloseHandle(newStd_Output);

	return 0;
}