我有一个非常奇怪的 JNI 编译问题,完全不知道如何解决...
这是一个在我的 Java 代码中从静态上下文调用的函数:
private static final Logger logger
= LoggerFactory.getLogger(PamHandle.class);
private static native void initLog(final Logger logger);
static {
System.loadLibrary("pam4j");
initLog(logger);
}
声明该函数的头文件如下:
#ifndef __LOG__H__
#define __LOG__H__
#include <jni.h>
JNIEXPORT void JNICALL Java_org_eel_kitchen_pam_PamHandle_initLog(JNIEnv *env,
jclass cls, jobject jlogger);
struct javaLogger {
jobject logger;
jmethodID debugID;
void (*debug)(JNIEnv *env, struct javaLogger *logger, char *msg);
};
extern struct javaLogger logger;
void debug(JNIEnv *env, struct javaLogger *logger, char *msg);
#endif /* __LOG_H__ */
这是 C 文件:
#include "log.h"
struct javaLogger logger;
JNIEXPORT void JNICALL Java_org_eel_kitchen_pam_PamHandle_initLog(JNIEnv *env,
jclass cls, jobject jlogger)
{
jclass class = (*env)->GetObjectClass(env, jlogger);
logger.logger = jlogger;
logger.debugID = (*env)->GetMethodID(env, class, "debug",
"(Ljava/lang/String;)V");
logger.debug = debug;
}
void debug(JNIEnv *env, struct javaLogger *logger, char *msg)
{
jstring jsmg = (*env)->NewStringUTF(env, (const char *)msg);
if (jmsg)
(*env)->CallVoidMethod(env, logger->logger, logger->debugID, jmsg);
}
但是当我尝试编译它时(使用 gcc -c -Wall -Werror -Wstrict-prototypes -Wmissing-prototypes -fPIC -g -c -I$JAVA_HOME/include -I$JAVA_HOME/include/linux log.c
),这是我得到的输出:
log.c: In function ‘debug’:
log.c:20:9: error: ‘jmsg’ undeclared (first use in this function)
log.c:20:9: note: each undeclared identifier is reported only once for each function it appears in
cc1: warnings being treated as errors
log.c:18:13: error: unused variable ‘jsmg’
呃...我完全目瞪口呆。这里发生了什么? :/我一定遗漏了一些非常明显的东西,我就是想不通是什么……
最佳答案
jmsg
和 jsmg
是两个不同的东西。
关于c - "error: ' xxx ' undeclared"_and_ "error: unused variable ' xxx '"同时在同一个文件中,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/8630351/