寫之前需要準備以下內容

android studio已ROOT安卓設備GG修改器

打開android studio,創建Native C++ Project

activity_main.xml

<?xml version='1.0' encoding='utf-8'?><LinearLayout xmlns:android='http://schemas.android.com/apk/res/android' android:layout_width='match_parent' android:layout_height='match_parent' android:gravity='center' android:orientation='vertical'> <Button android:layout_width='wrap_content' android:layout_height='wrap_content' android:onClick='btn' /> <TextView android: android:layout_width='wrap_content' android:layout_height='wrap_content' android:text='~' /></LinearLayout>

MainActivity.java

package com.gs.jc;import androidx.appcompat.app.AppCompatActivity;import android.os.Bundle;import android.view.View;import android.widget.TextView;public class MainActivity extends AppCompatActivity { private TextView textView; private JNI jni; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); jni = new JNI(); textView = (TextView) findViewById(R.id.tv); } public void btn(View view) { textView.setText(String.valueOf(jni.searchMem())); }}

新建一個java類,以實現java調用對應C代碼

package com.gs.jc;public class JNI { static { System.loadLibrary('native-lib'); }/**定義native方法*調用C代碼對應的方法*/ public native int searchMem();}

O_RDONLY只讀打開O_WRONLY只寫打開O_RDWR可讀可寫打開O_SYNC以同步的方式打開文件

C++核心代碼

#include <jni.h>#include <string>#include <stdio.h>#include <stdlib.h>#include <fcntl.h>#include <dirent.h>#include <unistd.h>static int fd = 0;//查找游戲進程pidint getPID(const char *pack_name) { int id = -1, pid = -1; DIR *dir = 0; FILE *file = 0; char filename[32] = {0}; char cmdline[256] = {0}; struct dirent *entry = 0; if (pack_name == NULL) { return -1; } dir = opendir('/proc'); if (dir == NULL) { return -1; } while ((entry = readdir(dir)) != NULL) { id = atoi(entry->d_name); if (id > 0) { sprintf(filename, '/proc/%d/cmdline', id); file = fopen(filename, 'r'); if (file) {fgets(cmdline, sizeof(cmdline), file);fclose(file);if (strcmp(pack_name, cmdline) == 0) { pid = id; break;} } } } closedir(dir); return pid;}//打開文件句柄int open_proc_mem(int pid) { if (pid <= 0) return -1; char mempath[64] = {0}; int handle = -1; sprintf(mempath, '/proc/%d/mem', pid); handle = open(mempath, O_RDWR, O_SYNC); return handle;}//讀內存void pread64_mem(int fd, void *buff, int size, long *addr) { if (fd <= 0 || buff == NULL || size <= 0 || addr == NULL) return; pread64(fd, buff, size, (unsigned long) addr);}//寫內存void pwrite64_mem(int fd, const void *buff, int size, long *addr) { if (fd <= 0 || buff == NULL || size <= 0 || addr == NULL) return; pwrite64(fd, buff, size, (unsigned long) addr);}extern 'C'jint Java_com_gs_jc_JNI_searchMem(JNIEnv *env, jobject thiz) { char *game = 'com.tencent.tmgp.sgame'; //包名 int pid = getPID(game);//獲取進程PID fd = open_proc_mem(pid);//打開進程內存 //long base = 0; long buf[1] = {666};//需要修改內存的值 long *addr = (long *) 0x12C0085C;//內存地址:0x12C0085C pwrite64_mem(fd, &buf[0], 4, addr);//寫入內存數據 //pread64_mem(fd, &base, 4, addr); return pid;}

C代碼中需要自行修改的地方

char *game = “com.tencent.tmgp.sgame”; //包名long *addr = (long *) 0x12C0085C;//內存地址

效果圖鏈接:yuanma/men_jb51.rar

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