[英]converting jint to jstring
#include <stdio.h>
#include "Package_MyTester.h"
jstring Java_Package_MyTester_NMethod
(JNIEnv *env, jobject obj, jint first, jint second) {
jint result_i = first * second;
jstring result;
int x = 0;
for(x=0;x<5;x++) {
printf("%d",x);
}
return result;
}
This program multiplies two jints. 这个程序乘以两个jints。 The result has to be in jstring. 结果必须是jstring。 Is there a way to convert jint to jstring ?. 有没有办法将jint转换为jstring?
You need to create a C buffer containing the result (using sprintf
) and then return the result of a NewStringUTF
function: 您需要创建一个包含结果的C缓冲区(使用sprintf
),然后返回NewStringUTF
函数的结果:
jstring Java_Package_MyTester_NMethod
(JNIEnv *env, jobject obj, jint first, jint second) {
jint result_i = first * second;
char buf[64]; // assumed large enough to cope with result
sprintf(buf, "%d", result_i); // error checking omitted
return (*env)->NewStringUTF(env, buf);
}
See §3.2.3 of http://java.sun.com/docs/books/jni/html/objtypes.html 参见http://java.sun.com/docs/books/jni/html/objtypes.html的 §3.2.3
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