This week's book giveaway is in the Clojure forum.
We're giving away four copies of Clojure in Action and have Amit Rathore and Francis Avila on-line!
See this thread for details.
Win a copy of Clojure in Action this week in the Clojure forum!
  • Post Reply
  • Bookmark Topic Watch Topic
  • New Topic

JNI problem

 
amit shukla
Ranch Hand
Posts: 45
  • 0
  • Mark post as helpful
  • send pies
  • Quote
  • Report post to moderator
Hi all,
I guess we dont have any forum particularly for JNI... thats y posting the porblem here...
whats the difference between passing a jstring from a java program to 'c' method AND using scanf from within the 'c' code to read the string from java execution environment... somewhat like done in the following 'c' method.....
here jstring 'str' is passed from a java method AND another string is read from the command prompt using scanf("%s", buf)
why in the first case we require conversion from unicode to UTF8 and not in the second case ....

JNIEXPORT jstring JNICALL Java_HelloName_displayHelloName(JNIEnv *env, jobject obj, jstring str)
{
char buf[128];
const char *s = (*env)->GetStringUTFChars(env, str, 0);
printf("Hello , %s\n",s);
(*env)->ReleaseStringUTFChars(env, str, s);
scanf("%s", buf);
return (*env)->NewStringUTF(env, buf);

}

 
gat98
Greenhorn
Posts: 3
  • 0
  • Mark post as helpful
  • send pies
  • Quote
  • Report post to moderator
Originally posted by amit shukla:
Hi all,
I guess we dont have any forum particularly for JNI... thats y posting the porblem here...
whats the difference between passing a jstring from a java program to 'c' method AND using scanf from within the 'c' code to read the string from java execution environment... somewhat like done in the following 'c' method.....
here jstring 'str' is passed from a java method AND another string is read from the command prompt using scanf("%s", buf)
why in the first case we require conversion from unicode to UTF8 and not in the second case ....

JNIEXPORT jstring JNICALL Java_HelloName_displayHelloName(JNIEnv *env, jobject obj, jstring str)
{
char buf[128];
const char *s = (*env)->GetStringUTFChars(env, str, 0);
printf("Hello , %s\n",s);
(*env)->ReleaseStringUTFChars(env, str, s);
scanf("%s", buf);
return (*env)->NewStringUTF(env, buf);

}


Hey
If you know the answer please let me know
thanks
gat
 
John Wetherbie
Rancher
Posts: 1449
  • 0
  • Mark post as helpful
  • send pies
  • Quote
  • Report post to moderator
gat98,
Please review the JavaRanch naming policy and re-register.
Thanks,
John
 
I agree. Here's the link: http://aspose.com/file-tools
  • Post Reply
  • Bookmark Topic Watch Topic
  • New Topic