Question

URGENT????????????????

Asked by: urmi123

qfile->files = LLMalloc(QE_MAX_FILES * sizeof(QFileInfo));
memset(qfile->files, 0, QE_MAX_FILES * sizeof(QFileInfo));



for(index = 0; index < qfile->filesNum; ++index)
{
 
       jstr = (*env)->CallObjectMethod(env, *jQUR, mid5, index);
       strcpy(qfile->files[index].fileName, getStringNativeChars(env, jstr));
      (*env)->DeleteLocalRef(env, jstr);
     
}

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Asked On
2005-03-11 at 03:29:04ID21346940
Tags

getstringnativechars

Topic

Java Programming Language

Participating Experts
3
Points
125
Comments
18

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Answers

 

by: CEHJPosted on 2005-03-11 at 03:30:07ID: 13515680

And the question is ...?

 

by: cjjcliffordPosted on 2005-03-11 at 03:32:41ID: 13515698

that's not even java code either....

 

by: urmi123Posted on 2005-03-11 at 03:37:45ID: 13515768

My callObjectMethod is failing i.e jstr is returned as null

 

by: ashok3sepPosted on 2005-03-11 at 03:40:52ID: 13515793

It s JNI code

what is that filesNum.....

is that the Array of files...
then you can get the length of the array by using the function getArrayLength()

you have to use jsize

regards,

Freedom

 

by: ashok3sepPosted on 2005-03-11 at 03:42:07ID: 13515801

Initialize jstring jstr:

then you use
 jstr =

 

by: urmi123Posted on 2005-03-11 at 03:42:10ID: 13515802

In java i have written the code as
public String getFilesfileName(int index)
      {      
            return files[index].fileName;
      }

This is how i am retrieving the method id in c
mid5 = (*env)->GetMethodID(env, cls, "getFilesfileName", "(I)Ljava/lang/String;");


 

by: CEHJPosted on 2005-03-11 at 03:43:50ID: 13515812

Since none of the info about what is happening in that function has been posted, it would be rather difficult to diagnose

 

by: urmi123Posted on 2005-03-11 at 03:52:58ID: 13515881

jstr = (*env)->CallObjectMethod(env, *jQUR, mid5, index);

my jstr is returned as null

i have defined jstr as jstring.

i am retreving length by using getArrayLength()

 

by: ashok3sepPosted on 2005-03-11 at 04:10:32ID: 13516002

you can just add

if(mid5 == 0)
return

else

do the processing

 

by: urmi123Posted on 2005-03-11 at 04:14:36ID: 13516030

but my mid5 is returning value

 

by: ashok3sepPosted on 2005-03-11 at 04:19:16ID: 13516064

what is then that *jQUR


and check whether the files[index] is not retruning a null

 

by: ashok3sepPosted on 2005-03-11 at 04:23:47ID: 13516093

jstring Java_GetString_getNativeString(JNIEnv *env, jobject obj)
{
char *cstr = " this is a C native null-terminated stringssss";
jstring jstr = (*env)->NewStringUTF(env,cstr);
return jstr;
}

Here cstr is the user defined string.........................

you  have to hav the Filename here...
so get the fiel name from the method by using the MethodID..........
that is what you want i hope you understand

regards,

Freedom

 

by: urmi123Posted on 2005-03-11 at 05:02:23ID: 13516378

public String getFilesfileName(int index)
     {    
          return files[index].fileName;
     }


is this part of my code right

 

by: ashok3sepPosted on 2005-03-11 at 05:37:05ID: 13516636

You are calling the method getFilesfileName

and then you have to pass the index to taht method

so that the files[index].filename is returned..............

so you have the for loop and pass the index to the method...........

regards,

Freedom

 

by: ashok3sepPosted on 2005-03-12 at 02:00:56ID: 13523785

Have you first got the class ID and then pass this class ID to the Method ID
/****************************************************
jclass cls;
jmethodID mid;
cls = (*env)->GetObjectClass(env, obj);
mid = (*env)->GetMethodID(env, cls, "getFilesfilename", "(I)LJava/lang/String;");

if(mid ==  0)
return;

jstring jstr;
for(index = 0; index < qfile->filesNum; ++index)
{
       jstr = (*env)-> getStringUTFChars(env,obj,mid,index);

// Process the String here ..........................................

      (*env-)->ReleaseStringUTFChars(jstr,0);
}
***************************** ***********************/

Hope this helps

if otherwise you can directly pass the Array of Filenames from java to your native code and you can process the filenames inside your native code......

Accessing Arrays of Objects
The JNI provides a separate set of function to access elements of object arrays. You can get and set individual object array elements. You cannot get all the object array elements at once.

    * GetObjectArrayElement returns the object element at a given index.

Regards,

Freedom
   

20120131-EE-VQP-002

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