/*
    getreg.c - Obtiene un valor del registry y lo pone en la salida estandard

    Copyright (C) 2000, Luis C. Castro Skertchly

	This program is free software; you can redistribute it and/or modify
	it under the terms of the GNU General Public License as published by
	the Free Software Foundation; either version 2 of the License, or
	(at your option) any later version.

	This program is distributed in the hope that it will be useful,
	but WITHOUT ANY WARRANTY; without even the implied warranty of
	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
	GNU General Public License for more details.

	You should have received a copy of the GNU General Public License
	along with this program; if not, write to the Free Software
	Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

Uso:
getreg {CR|CU|LM} Key ValueName

CR = CLASSES_ROOT
CU = CURRENT_USER
LM = LOCAL_MACHINE
*/

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


HKEY hKey;
HKEY hSubKey;
DWORD dwError;
BYTE Data[1024];
DWORD cbData;
DWORD dwDisposition;
LPBYTE lpMsgBuf;

void uso(void)
{
	fprintf(stderr, "Uso:\ngetreg {CR|CU|LM} Key ValueName\n\n");
	exit(1);
}


int main(int argc, char **argv)
{
	if (argc != 4) uso();
	if (!strcmp(argv[1], "CR"))
		hKey = HKEY_CLASSES_ROOT;
	else if (!strcmp(argv[1], "CU"))
		hKey = HKEY_CURRENT_USER;
	else if (!strcmp(argv[1], "LM"))
		hKey = HKEY_LOCAL_MACHINE;
	else uso();

//fprintf(stderr, "Key = '%s'\nSubKey = '%s'\nValue = '%s'\n", argv[1], argv[2], argv[3]);

	if ((dwError = RegCreateKeyEx(hKey,
		argv[2],
		0,
		NULL,
		REG_OPTION_NON_VOLATILE,
		KEY_ALL_ACCESS,
		NULL,
		&hSubKey,
		&dwDisposition)) != ERROR_SUCCESS)
	{
		FormatMessage(FORMAT_MESSAGE_ALLOCATE_BUFFER | FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_MAX_WIDTH_MASK, NULL, dwError, 0, (LPSTR) &lpMsgBuf, 0, NULL);
		fprintf(stderr, "RegCreateKeyEx() - %s\n", lpMsgBuf);
		return 1;
	}
	cbData = sizeof(Data);
	dwError = RegQueryValueEx(hSubKey, argv[3], 0, NULL, Data, &cbData);
	if (dwError)
	{
		FormatMessage(FORMAT_MESSAGE_ALLOCATE_BUFFER | FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_MAX_WIDTH_MASK, NULL, dwError, 0, (LPSTR) &lpMsgBuf, 0, NULL);
		fprintf(stderr, "RegQueryValueEx() - %s\n", lpMsgBuf);
		return 1;
	}
	printf(Data);
	return 0;
}