计算器！
我设法将我的dll注入游戏我的游戏（用java制作），我确实附加到主线程，所以我可以获得课程和字段。
总代码：
#include <Windows.h>
#include <jni.h>
#include <iostream>
#include <string>
#include "MCClass.h"
/*
BOOL WINAPI DllMain(
_In_ HINSTANCE hinstDLL,
_In_ DWORD fdwReason,
_In_ LPVOID lpvReserved
);
*/
typedef jint (*hJNI_GetCreatedJavaVMs )( JavaVM** vmBuf , jsize bufLen , jsize* nVMs );
hJNI_GetCreatedJavaVMs oJNI_GetCreatedJavaVMs;
HMODULE jvmHandle;
FARPROC func_JNI_GetCreatedJavaVMs;
JavaVM *jvm;
JNIEnv *jenv;
jclass Minecraft;
jclass FMLH;
jclass FMLHI;
jclass launchWrapper;
MCClass* mc = new MCClass ( );
using namespace std;
void GetAllMinecraft ( )
{
jfieldID f = jenv->GetFieldID ( Minecraft , "serverName" , "Ljava/lang/String;" );
if ( f != NULL )
{
jstring str = (jstring)jenv->GetObjectField ( Minecraft , f );
mc->serverName = (char*)jenv->GetStringUTFChars( str , 0 );
cout << mc->serverName << endl;
}
else
{
MessageBox ( NULL , "serverName is null", "ERROR" , MB_OK );
}
}
/*
void start ( )
{
MessageBox ( NULL , "Initialization has completed." , "Works" , MB_OK );
FMLH = jenv->FindClass ( "net/minecraftforge/fml/relauncher/FMLLaunchHandler" );
if ( FMLH != nullptr )
{
MessageBox ( NULL , "FMLLaunchHandler found successfully" , "OK" , MB_OK );
jfieldID f = jenv->GetStaticFieldID ( (jclass) FMLH , "INSTANCE" , "Lnet/minecraftforge/fml/relauncher/FMLLaunchHandler;" );
MessageBox ( NULL , "FMLH passed" , "OK" , MB_OK );
if ( f == nullptr )
{
MessageBox ( NULL , "FMLLaunchHandler fieldID couldn't be found successfully" , "OK" , MB_OK );
}
else
{
MessageBox ( NULL , "FMLLaunchHandler fieldID found successfully" , "OK" , MB_OK );
FMLHI = jenv->GetStaticObjectField ( (jclass) FMLH , f );
MessageBox ( NULL , "FMLHI passed" , "OK" , MB_OK );
if ( FMLHI == nullptr )
{
MessageBox ( NULL , "FMLLaunchHandler instance couldn't be found successfully" , "OK" , MB_OK );
}
else
{
MessageBox ( NULL , "FMLHI is not nullptr" , "OK" , MB_OK );
jfieldID f1 = jenv->GetFieldID ( ( jclass ) FMLHI , "classLoader" , "Lnet/minecraft/launchwrapper/LaunchClassLoader;" ); //HERE
MessageBox ( NULL , "f1 passed" , "OK" , MB_OK );
if ( f1 == nullptr )
{
MessageBox ( NULL , "classLoader fieldID couldn't be found successfully" , "OK" , MB_OK );
}
else
{
MessageBox ( NULL , "classLoader fieldID found successfully" , "OK" , MB_OK );
launchWrapper = jenv->GetObjectField ( ( jclass ) FMLHI , f1 );
MessageBox ( NULL , "launchWrapper passed" , "OK" , MB_OK );
if ( launchWrapper == nullptr )
{
MessageBox ( NULL , "classLoader class couldn't be found successfully" , "OK" , MB_OK );
}
else
{
MessageBox ( NULL , "classLoader class found successfully" , "OK" , MB_OK );
jmethodID mmid = jenv->GetMethodID ( ( jclass ) launchWrapper , "findClass" , "(Ljava/lang/String;)Ljava/lang/Class;" );
MessageBox ( NULL , "findClass passed" , "OK" , MB_OK );
if ( mmid != NULL )
{
Minecraft = ( jclass ) jenv->CallNonvirtualObjectMethod ( launchWrapper , ( jclass ) launchWrapper , mmid , "net.minecraft.client.Minecraft" );
MessageBox ( NULL , "Minecraft class found successfully" , "OK" , MB_OK );
// GetAllMinecraft ( );
}
else
{
MessageBox ( NULL , "findClass method ID couldn't be found successfully" , "OK" , MB_OK );
}
}
}
}
}
}
else
{
MessageBox ( NULL , "FMLLaunchHandler couldn't be found successfully" , "OK" , MB_OK );
}
}
*/
const char* GetObjName ( jobject cls )
{
jclass clsClazz = jenv->GetObjectClass ( cls );
jmethodID methodId = jenv->GetMethodID ( clsClazz , "getName" , "()Ljava/lang/String;" );
jstring className = ( jstring ) jenv->CallObjectMethod ( cls , methodId );
return jenv->GetStringUTFChars ( className , NULL );
jenv->DeleteLocalRef ( clsClazz );
}
void start ( )
{
jclass preMC = jenv->FindClass ( "net/minecraftforge/fml/relauncher/FMLLaunchHandler" );
if ( preMC != NULL )
{
/*Section intercept custom findClassStart*/
jfieldID iID = jenv->GetStaticFieldID ( preMC , "INSTANCE" , "Lnet/minecraftforge/fml/relauncher/FMLLaunchHandler;" );
cout << "IID: " << iID << endl;
jobject instance = jenv->GetStaticObjectField ( preMC , iID );
cout << "INSTANCE: " << instance << endl;
jfieldID lID = jenv->GetFieldID ( preMC , "classLoader" , "Lnet/minecraft/launchwrapper/LaunchClassLoader;" );
cout << "LID: " << lID << endl;
jobject classLoader = jenv->GetObjectField ( instance , lID );
cout << "classLoader: " << classLoader << endl;
jmethodID fid = jenv->GetMethodID ( jenv->GetObjectClass(classLoader) , "findClass" , "(Ljava/lang/String;)Ljava/lang/Class;" );
cout << "FID: " << fid << endl;
jobject a = jenv->CallNonvirtualObjectMethod ( classLoader , jenv->GetObjectClass(classLoader), fid , "net/minecraft/client/Minecraft" );
preMC = ( jclass ) a;
cout << "preMC: " << preMC << endl;
/*Section intercept custom findClassEND*/
/*Section getDisplayWidthStart*/
jfieldID mid = jenv->GetStaticFieldID ( jenv->GetObjectClass(preMC) , "theMinecraft" , "Lnet/minecraft/client/Minecraft;" );
cout << "MID: " << mid << endl;
jobject MC = jenv->GetStaticObjectField ( jenv->GetObjectClass(preMC) , mid );
cout << "MC: " << MC << endl;
jfieldID mid2 = jenv->GetFieldID ( jenv->GetObjectClass(MC) , "displayWidth" , "I" );
cout << "MID2: " << mid2 << endl;
int displayWidth = jenv->GetIntField ( MC , mid2 );
cout << "DisplayWidth: " << displayWidth << endl;
/*Section getDisplayWidthEND*/
}
}
void init ( )
{
jvmHandle = GetModuleHandleA ( "jvm.dll" );
func_JNI_GetCreatedJavaVMs = GetProcAddress ( jvmHandle , "JNI_GetCreatedJavaVMs" );
oJNI_GetCreatedJavaVMs = ( hJNI_GetCreatedJavaVMs ) func_JNI_GetCreatedJavaVMs;
jint returnOF = oJNI_GetCreatedJavaVMs ( &jvm , 1 , NULL );
jint returnOf1 = jvm->AttachCurrentThread ( ( void ** ) &jenv , NULL );
if ( jenv != nullptr )
{
start ( );
}
if ( jenv->ExceptionCheck ( ) )
{
jenv->ExceptionDescribe ( );
}
jvm->DetachCurrentThread ( );
}
BOOL WINAPI DllMain ( HINSTANCE hinstDLL , DWORD fdwReason , LPVOID lpvReserved )
{
switch ( fdwReason )
{
case DLL_PROCESS_ATTACH:
init ( );
//case DLL_PROCESS_DETACH:
//case DLL_THREAD_ATTACH:
//case DLL_THREAD_DETACH:
}
}
注意：此游戏使用自定义类启动器，+我在其上使用forge api。
我查看了cout调试，看起来像cout停在：
cout << "FID: " << fid << endl;
之后不再打电话给cout。然后游戏停止响应。 感谢您阅读，希望我的描述性足够。
编辑：整个代码停止游戏我的飞机在一段时间后响应或立即随机发出随机。
我现在使用带极端注射器的标准注射。
这是我从调试中得到的一些信息：
IID: 0000000024D1FE80
INSTANCE: 00000000191813F8
LID: 0000000000000032
classLoader: 0000000019181400
FID: 0000000016176C90
#
# A fatal error has been detected by the Java Runtime Environment:
#
# EXCEPTION_ACCESS_VIOLATION (0xc0000005) at pc=0x0000000002d7688e, pid=6048, tid=0x0000000000001648
#
# JRE version: Java(TM) SE Runtime Environment (8.0_92-b14) (build 1.8.0_92-b14)
# Java VM: Java HotSpot(TM) 64-Bit Server VM (25.92-b14 mixed mode windows-amd64 compressed oops)
# Problematic frame:
# J 3576 C2 net.minecraft.launchwrapper.LaunchClassLoader.findClass(Ljava/lang/String;)Ljava/lang/Class; (695 bytes) @ 0x0000000002d7688e [0x0000000002d76820+0x6e]
#
# Failed to write core dump. Minidumps are not enabled by default on client versions of Windows
#
# An error report file with more information is saved as:
# C:\Users\Balen\Desktop\ForgeMod\eclipse\hs_err_pid6048.log
#
# If you would like to submit a bug report, please visit:
# http://bugreport.java.com/bugreport/crash.jsp
#
AL lib: (EE) alc_cleanup: 1 device not closed
:runClient FAILED
FAILURE: Build failed with an exception.
* What went wrong:
Execution failed for task ':runClient'.
> Process 'command 'C:\Program Files\Java\jdk1.8.0_92\bin\java.exe'' finished with non-zero exit value 1
* Try:
Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output.
BUILD FAILED
Total time: 8 mins 50.128 secs
编辑：这是为了更好地解释一切：
在游戏中的所有内容初始化后，我将这个dll注入游戏中。
游戏使用自定义类加载器（LaunchClassLoader）我尝试检索它的实例，为此我得到FMLLaunchHandler我得到一个FMLLaunchHandler实例然后从该实例我得到classLoader并从该实例我使用classLoaders findClass来获得课程。
有人告诉我，我需要获取类的初始化版本才能使用非静态方法或获取非静态字段。
我现在使用一种名为极端进样器的进样器，并使用标准进样，即loadlibrary。
我也没有创建自己的虚拟机，我附加到正在运行的minecraft vm并通过dll和init函数获取env来处理附加。
感谢阅读，祝你有个美好的一天。