>Dear r-helpers,
>I have been trying to invoke R from Java in a Windows 2000 computer
>(unfortunately). All my environment variables seem to be properly set,
>everything seems to be in order, but I obtaining a
>Fatal error: unable to open the base package
>error window.
[...]
>Some time ago I found a number of messages by another person facing the
>same problems and he said that when R was invoked directly, it could
>properly read the R_HOME variable, but when invoked from Java, it
>searched for the base package in the wrong place (a subdirectory of the
>jre, if my memory is to be trusted).
This was filed as bug 2003. I have exchanged some emails with Professor
Ripley and he convinced me, that it's not a bug in R. The problem is
caused
by SJava, that doesn't invoke R as described in src/gnuwin32/front-ends.
I have appended a new version of REmbedWin.c, based on the samples in
src/gnuwin32/front-ends, that solves this problem. You just have to
recompile
SJava with the new version of REmbedWin.c. I have tested it with
JDK1.3.1 on
Windows 2000, not with JDK1.4.1.
Regards,
Heinz Grimm
/* REmbedWin.C
* avoids problem with loading base package
*/
/* 27/03/2000 win32-api needs this */
#define NONAMELESSUNION
#include <windows.h>
#include <stdio.h>
#include <config.h>
#include <Rversion.h>
#include <Startup.h>
/* for askok and askyesnocancel */
#include <graphapp/graphapp.h>
/* for signal-handling code */
#include <psignal.h>
/* one way to allow user interrupts: called in ProcessEvents */
#ifdef _MSC_VER
__declspec(dllimport) int UserBreak;
#else
#define UserBreak (*_imp__UserBreak)
extern int UserBreak;
#endif
/* calls into the R DLL */
extern char *getDLLVersion();
extern void R_DefParams(Rstart);
extern void R_SetParams(Rstart);
extern void setup_term_ui(void);
extern void ProcessEvents(void);
extern void end_Rmainloop(void), R_ReplDLLinit(void);
extern int R_ReplDLLdo1();
extern void run_Rmainloop(void);
/* simple input, simple output */
/* This version blocks all events: a real one needs to call
ProcessEvents
frequently. See rterm.c and ../system.c for one approach using
a separate thread for input */
int myReadConsole(char *prompt, char *buf, int len, int addtohistory)
{
fputs(prompt, stdout);
fflush(stdout);
if(fgets(buf, len, stdin)) return 1;
else return 0;
}
void myWriteConsole(char *buf, int len)
{
printf("%s", buf);
}
void myCallBack()
{
/* called during i/o, eval, graphics in ProcessEvents */
}
void myBusy(int which)
{
/* set a busy cursor ... if which = 1, unset if which = 0 */
}
static void my_onintr(int sig)
{
UserBreak = 1;
}
void winInit_R()
{
char *argv[] = {"SJava", "--no-save",
"--silent"};
int argc;
argc = sizeof(argv)/sizeof(argv[0]);
structRstart rp;
Rstart Rp = &rp;
char Rversion[25], RUser[MAX_PATH], RHome[MAX_PATH], *p;
sprintf(Rversion, "%s.%s", R_MAJOR, R_MINOR);
if(strcmp(getDLLVersion(), Rversion) != 0)
{
fprintf(stderr, "Error: R.DLL version does not match\n");
exit(1);
}
R_DefParams(Rp);
if(getenv("R_HOME"))
{
strcpy(RHome, getenv("R_HOME"));
}
else
{
fprintf(stderr, "R_HOME must be set\n");
exit(1);
}
Rp->rhome = RHome;
/*
* try R_USER then HOME then working directory
*/
if (getenv("R_USER"))
{
strcpy(RUser, getenv("R_USER"));
} else
if (getenv("HOME"))
{
strcpy(RUser, getenv("HOME"));
} else
if (getenv("HOMEDIR"))
{
strcpy(RUser, getenv("HOMEDIR"));
strcat(RUser, getenv("HOMEPATH"));
} else
{
GetCurrentDirectory(MAX_PATH, RUser);
}
p = RUser + (strlen(RUser) - 1);
if (*p == '/' || *p == '\\') *p = '\0';
Rp->home = RUser;
Rp->CharacterMode = LinkDLL;
Rp->ReadConsole = myReadConsole;
Rp->WriteConsole = myWriteConsole;
Rp->CallBack = myCallBack;
Rp->message = askok;
Rp->yesnocancel = askyesnocancel;
Rp->busy = myBusy;
Rp->R_Quiet = TRUE;
Rp->R_Interactive = FALSE;
Rp->RestoreAction = SA_RESTORE;
Rp->SaveAction = SA_NOSAVE;
Rp->CommandLineArgs = NULL;
Rp->NumCommandLineArgs = 0;
/* Rp->nsize = 300000;
Rp->vsize = 6e6; */
R_SetParams(Rp); /* so R_ShowMessage is set */
R_SizeFromEnv(Rp);
R_SetParams(Rp);
FlushConsoleInputBuffer(GetStdHandle(STD_INPUT_HANDLE));
signal(SIGBREAK, my_onintr);
setup_term_ui();
setup_Rmainloop();
return;
}
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