/*************************************************************************************/
/* File Name     : launch.cpp                                                        */
/* Log File Name : output.txt                                                        */
/* Author        : Meng Yi Yee                                                       */
/* Class         : CS 431                                                            */
/* Date          : Oct 4, 1999                                                       */
/*                                                                                   */
/* This program shows an approach to developing multi-process program. This program  */
/* can read more than 1 file. Each file contains a list of programs that to be       */
/* executed. The main function of running the list of programs is 'CreateProcess'    */
/* which will read the command line from the file and execute the programs.          */
/*                                                                                   */
/* The main program first reads the user command from DOS. The user will input       */
/* 'launch <filename1.txt> <filename2.txt>..' to run this program. <filename2.txt>   */
/* and so on are optional. This way, the user can call for more than 1 file to       */
/* execute the list of programs in different files. From the assignment, it would be */
/* 'launch launchset.txt'. In this case the argc=2, argv[0]=launch,                  */
/* argv[1]=launch.txt. Then, it will read a sigle line at a time and call            */
/* 'CreateProcess' to launch the particular program. All the result will store in    */
/* 'output.txt'.                                                                     */
/*                                                                                   */
/*************************************************************************************/


#include "stdafx.h"
#include <stdio.h>
#include <string.h>
#include <windows.h>

int main(int argc, char* argv[])
{
	
	
	//Declare local variables and initialize variables
	
	FILE *fid;
	FILE *fout;
	char cmdLine[100];
	int MAX_LINE_LEN=100;
	char lpCommandLine[20];
	STARTUPINFO startInfo;
	PROCESS_INFORMATION processInfo;
	
	
	//Output instruction when there is an error executing the program and exit 
	//the program

	if (argc<2)
	{
		printf("\nError running 'launch.exe', please try again\n");
		printf("launch <filename1.txt> <filename2.txt>...\n");
		printf("<filename2.txt> and so on are optional\n");
		printf("Example: launch launchset.txt\n");
		return 0;
	}
	
	
	//Open 'output.txt' as an output file. If fail, exit the program
	
	fout=fopen("output.txt", "w");
	if (!fout)
	{
		fprintf (stderr, "Open file output.txt failed\n");
		return 0;
	}

	
	//

	for (int i=1; i<argc; ++i)
	{ 
		

		//open the file with list of programs to be executed and output error if
		//error occurs

		fprintf(fout, "File= %s\n", argv[i]);
		fid=fopen(argv[i], "r");
		if (!fid)
		{
			fprintf (stderr, "Open file %s failed\n", argv[i]);
			fprintf (fout, "Open file %s failed\n", argv[i]);
			printf ("Please make sure that the file name is correct\n");
			exit(1);
		}
			
		
		//Read the file line by line

		while (fgets(cmdLine, MAX_LINE_LEN, fid)!=NULL)
		{
			fprintf (fout, "%s", cmdLine);
			ZeroMemory(&startInfo, sizeof(startInfo));
			startInfo.cb=sizeof(startInfo);
			
			
			//Execute the program by calling 'CreateProcess'

			if (!CreateProcess(NULL, cmdLine, NULL, NULL, FALSE, 
				HIGH_PRIORITY_CLASS|CREATE_NEW_CONSOLE, NULL, NULL, &startInfo, 
				&processInfo))
			{
				printf("%s\n", cmdLine);
				fprintf(stderr, "CreateProcess failed on error %d \n", GetLastError());
				fprintf(fout, "CreateProcess failed on error %d \n", GetLastError());
				fclose(fout);
				fclose(fid);
				ExitProcess(1);
			}
			else
				fprintf(fout, "CreateProcess Succeeded\n\n");
		}
	}


	//Terminate after all commands have finished

	CloseHandle(&processInfo.hThread);
	CloseHandle(&processInfo.hProcess);
	fclose(fout);
	fclose(fid);
	return 0;
}