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Creating a C Static Char Array

Posted on 2012-03-19
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Last Modified: 2012-03-19
Hello,

I'm trying to create a static array in C for some JNI testing.  My goal is to have the charArray function return a pointer to a char array and then in my JNI code, I'll retrieve those results.  Whenever I have more than one character in the C char array, my JNI code is only able to get the last character from the array element (i.e. 'C', 'E' and '6' get returned for "doesn't work example below).

I feel I have a bug in the way I'm creating the array on the C side, does anyone have any ideas of where I've gone wrong?  

Works:
inline char *charArray(){
	static char foo[3];
	foo[0]='A';
    foo[1]='5';
    foo[2]='E';
    return foo;
}

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Doesn't Work:
inline char *charArray(){
	static char foo[3];
	foo[0]='ABC';
    foo[1]='5CDE';
    foo[2]='EEE6';
    return foo;
}

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0
Comment
Question by:cgray1223
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3 Comments
 
LVL 86

Expert Comment

by:jkr
ID: 37739613
I think you are mixing up a character or chars and a character of strings. If your final goal would be to concatenate strings to one longer string, you should use

inline char *charArray(){
	static char foo[64] = "\0";
	strcat(foo,"ABC");
	strcat(foo,"5CDE");
	strcat(foo,"EEE6");

    return foo;
}                     

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The above would return "ABC5CDEEEE6".
0
 

Author Comment

by:cgray1223
ID: 37739784
thanks for the response, jkr.  The goal would be to treat them as separate elements on the Java side and not string the together.
0
 
LVL 86

Accepted Solution

by:
jkr earned 2000 total points
ID: 37739806
Hmmm, then you are probably thinking of an array of strings, i.e.

inline char *stringArray(){
	static char* foo[3];
	foo[0]="ABC";
    foo[1]="5CDE";
    foo[2]="EEE6";
    return foo;
}
                                  
}
                                  

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