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Please read the FAQ!
<http://java.apache.org/faq/>
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Dear Graeme,
Thanks for the response.
We are working on Linux 5.2 (Redhat)
Apache 1.3.6
using gcc compiler v 2.7
We may use a Debugger, but we have restriction to
submit as test finding a printed document showing the
values of the variables passed to C.
Hence the problem.
The C program handling the native call is like:
#include <stdio.h>
#include <stdlib.h>
#include <jni.h>
#include "CClose.h"
#include <string.h>
JNIEXPORT jint JNICALL Java_CClose_Cclose(JNIEnv* env,
jobject obj, jobject pHan
dle)
{
HANDLE pststoreHandle;
int uCloseHandle = 0;
jfieldID jhandle_1;
jfieldID jhandle_2;
jfieldID jhandle_3;
jclass pHandleClass;
FILE *fp;
pststoreHandle = (HANDLE *)malloc(sizeof(HANDLE));
fp = fopen("jnitrcfile.txt","w+");
/* Prepare HANDLE structure*/
pHandleClass = (*env)->GetObjectClass(env,
pHandle);
jhandle_1 = (*env)->GetFieldID(env, pHandleClass,
"SessionID", "I");
pststoreHandle->SessionID =
(*env)->GetIntField(env, pHandle, jhandle_1);
fprintf(fp,"Before calling API, session ID as %d
\n", pststoreHandle->SessionID);
jhandle_2 = (*env)->GetFieldID(env, pHandleClass,
"ErrType", "I");
jhandle_3 = (*env)->GetFieldID(env, pHandleClass,
"ErrCode", "I");
uCloseHandle = CClose(pststoreHandle);
if (uCloseHandle == NO_ERROR)
{
fprintf(fp,"NO-ERRORCASE...\n");
fprintf(fp,"Before return from no error %d
\n", uCloseHandle);
}
else
{
fprintf(fp,"CALLING ERROR...\n");
fprintf(fp,"Before return from error %d \n",
uCloseHandle);
}
fclose(fp);
free(pststoreHandle);
return uCloseHandle;
}
Regards,
Dipankar
Subject: RE: JNI-Servlet
From: "Graeme Wallace" <[EMAIL PROTECTED]>
Date: Thu, 2 Sep 1999 09:47:34 -0500
> After a time consuming effort, we could run servlets
> that call JNI-Java.
>
> We are facing a problem:
> If the C Library which we are calling from the
Servlet
> via JNI has any FILE handling statements (fopen,
> fprintf...), it is impossible to run the servlet.
>
>What platform are you running on ? It may just be a >
missing symbol at runtime linking.
>Also depending on what platform you can attach >a
debugger to a
>running java process and set breakpoints etc in your
>JNI code.
>regards,
>Graeme.
===
DIPANKAR CHAKRABARTI
Have a Nice Time............
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