JNI variable Printing

1. Package Log.h

#ifndef __multi_trace_h__
#define __multi_trace_h__

#ifdef Android_ndk_build
#define LOG_TAG "NATIVE NDK INFO"

#include <android/log.h>//only use in NDK

#define LOGE (...) (void) __android_log_print (Android_log_error, Log_tag, __va_args__))
#define LOGD (...) (void) __android_log_print (Android_log_debug, Log_tag, __va_args__))
#define Logi (...) (void) __android_log_print (Android_log_info, Log_tag, __va_args__))
#define LOGW (...) (void) __android_log_print (Android_log_warn, Log_tag, __va_args__))
#elif defined Android_source_build
#define LOG_TAG "NATIVE SRC INFO"

extern "C" {
#include <cutils/log.h>//Only use in ANDROID SOURCE
}

#define LOGE (...) LOG (Log_error, Log_tag, __va_args__)
#define LOGD (...) LOG (Log_debug, Log_tag, __va_args__)
#define Logi (...) LOG (Log_info, Log_tag, __va_args__)
#define LOGW (...) LOG (Log_warn, Log_tag, __va_args__)
#elif defined Ios_platform_build
#define LOGE printf
#define LOGD printf
#define Logi printf
#define LOGW printf
#elif defined Wp_platform_build
#define LOG_TAG "NATIVE WINDOWS PHONE"
#define LOG_ERROR "ERROR"
#define LOG_DEBUG "DEBUG"
#define LOG_INFOR "INFOR"
#define Log_warn "WARN"

void LOG (const char* status, const char* tag, const char* format, ...);

#define LOGE (...) LOG (Log_error, Log_tag, __va_args__)
#define LOGD (...) LOG (Log_debug, Log_tag, __va_args__)
#define Logi (...) LOG (Log_info, Log_tag, __va_args__)
#define LOGW (...) LOG (Log_warn, Log_tag, __va_args__)
#else
#define LOGE printf
#define LOGD printf
#define Logi printf
#define LOGW printf
#endif

#endif

2. Configuring in Android.mk

Local_path: = $ (call My-dir)//Set as current folder

Include $ (clear_vars)//Empty variable

Local_module: = apkpatchlibrary///finally generated. So file will be the second name of the wallet Lib (if this name is Libxxx, the generated. So file package name is this name)
Local_cflags =-dandroid_ndk_build-d__stdc_format_macros-d__stdc_int64__//Set this sentence is equivalent to the declaration of XXXXX (-DXXXXX) in each of the C + + files.

Local_cxxflags: =

Local_c_includes: = $ (Local_path)

Local_src_files: = COM_LIB_UTILS_PATCH.C//compiled C + + file
Local_ldlibs: =-lz-llog//need to add this log to print out,-l is a fixed statement, (such as:-lz marked loading system z.so package. -llog Flag Loading System log.so pack)

Include $ (build_shared_library)//Set Declaration dynamic Library

3. Print the log. Take a look at the examples:

Jniexport jint jnicall java_com_lib_utils_patchutils_patch (jnienv *env,
Jobject obj, jstring old, jstring new, jstring patch) {
char * ch[4];
Ch[0] = "Bspatch";
CH[1] = (char*) ((*env)->getstringutfchars (env, old, 0));
CH[2] = (char*) ((*env)->getstringutfchars (env, new, 0));
CH[3] = (char*) ((*env)->getstringutfchars (env, patch, 0));


LOGD ("11111111111111111111");
const char *STR = (*env)->getstringutfchars (env, old, 0);
const char *strnew = (*env)->getstringutfchars (env, new, 0);
const char *strpatch = (*env)->getstringutfchars (env, patch, 0);


LOGD ("The first is%s", str);
LOGD ("The second is%s", strnew);
LOGD ("The third is%s", Strpatch);
LOGD ("11111111111111111111");


int ret = Applypatch (4, CH);
(*env)->releasestringutfchars (env, old, ch[1]);
(*env)->releasestringutfchars (env, New, ch[2]);
(*env)->releasestringutfchars (env, Patch, ch[3]);

return ret;
}

This allows you to print out old, new. Patch the value of these three parameters (variables) that.

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JNI variable Printing