NX⼆次开发-C++使⽤IDAPro反编译dll,追踪查看⾥⾯使⽤的UFUNAPI函数(三部曲1)⼀年前我写过⼀个C#反编译dll查看代码系列
今天写⼀下C++反编译dll查看代码系列
也是准备的三部曲,这是三部曲1
演⽰版本:
NX9+VS2012
操作步骤
1.⾃⼰在VS⾥⽤NX开发向导写⼀份代码(简单例⼦)
//NX9_NXOpenCPP_Wizard2
// Mandatory UF Includes
#include <uf.h>
#include <uf_object_types.h>
// Internal Includes
#include <NXOpen/ListingWindow.hxx>
#include <NXOpen/NXMessageBox.hxx>
#include <NXOpen/UI.hxx>
// Internal+External Includes
#include <NXOpen/Annotations.hxx>
#include <NXOpen/Assemblies_Component.hxx>
#include <NXOpen/Assemblies_ComponentAssembly.hxx>
#include <NXOpen/Body.hxx>
#include <NXOpen/BodyCollection.hxx>
#include <NXOpen/Face.hxx>
#include <NXOpen/Line.hxx>
#include <NXOpen/NXException.hxx>
#include <NXOpen/NXObject.hxx>
#include <NXOpen/Part.hxx>
#include <NXOpen/PartCollection.hxx>
#include <NXOpen/Session.hxx>
#include <uf.h>
#include <uf_modl.h>
#include <uf_obj.h>
// Std C++ Includes
#include <iostream>
#include <sstream>
using namespace NXOpen;
using std::string;
using std::exception;
using std::stringstream;
using std::endl;
using std::cout;
using std::cerr;
//------------------------------------------------------------------------------
// NXOpen c++ test class
//------------------------------------------------------------------------------
class MyClass
{
// class members
public:
static Session *theSession;
static UI *theUI;
MyClass();
~MyClass();
void do_it();
void print(const NXString &);
void print(const string &);
void print(const char*);
private:
Part *workPart, *displayPart;
NXMessageBox *mb;
ListingWindow *lw;
LogFile *lf;
};
//------------------------------------------------------------------------------
// Initialize static variables
//------------------------------------------------------------------------------Session *(MyClass::theSession) = NULL;
UI *(MyClass::theUI) = NULL;
/
/------------------------------------------------------------------------------
// Constructor
//------------------------------------------------------------------------------MyClass::MyClass()
{
// Initialize the NX Open C++ API environment
MyClass::theSession = NXOpen::Session::GetSession();
MyClass::theUI = UI::GetUI();
mb = theUI->NXMessageBox();
lw = theSession->ListingWindow();
lf = theSession->LogFile();
workPart = theSession->Parts()->Work();
displayPart = theSession->Parts()->Display();
}
//------------------------------------------------------------------------------
// Destructor
//------------------------------------------------------------------------------MyClass::~MyClass()
{
}
//------------------------------------------------------------------------------
// Print string to listing window or stdout
//------------------------------------------------------------------------------
void MyClass::print(const NXString &msg)
{
if(! lw->IsOpen() ) lw->Open();
lw->WriteLine(msg);
}
void MyClass::print(const string &msg)
{
if(! lw->IsOpen() ) lw->Open();
lw->WriteLine(msg);
}
void MyClass::print(const char * msg)
{
if(! lw->IsOpen() ) lw->Open();
lw->WriteLine(msg);
}
void MyTest()
include怎么用{
UF_initialize();
//创建块
UF_FEATURE_SIGN Sign = UF_NULLSIGN;//设置布尔
double Corner_pt[3] = { 0.0, 0.0, 0.0 };//设置原点
char *Edge_Len[3] = { "100", "100", "100" };//设置长宽⾼
tag_t BlkTag = NULL_TAG;
UF_MODL_create_block1(Sign, Corner_pt, Edge_Len, &BlkTag); //特征体
tag_t body_tag = NULL_TAG;
UF_MODL_ask_feat_body(BlkTag, &body_tag);
//设置颜⾊
UF_OBJ_set_color(body_tag, 186);
UF_terminate();
}
//------------------------------------------------------------------------------
// Do something
//------------------------------------------------------------------------------
void MyClass::do_it()
{
// TODO: add your code here
MyTest();
}
//------------------------------------------------------------------------------
// Entry point(s) for unmanaged internal NXOpen C/C++ programs
//------------------------------------------------------------------------------
//  Explicit Execution
extern"C" DllExport void ufusr( char *parm, int *returnCode, int rlen )
{
try
{
// Create NXOpen C++ class instance
MyClass *theMyClass;
theMyClass = new MyClass();
theMyClass->do_it();
delete theMyClass;
}
catch (const NXException& e1)
{
UI::GetUI()->NXMessageBox()->Show("NXException", NXOpen::NXMessageBox::DialogTypeError, e1.Message());
}
catch (const exception& e2)
{
UI::GetUI()->NXMessageBox()->Show("Exception", NXOpen::NXMessageBox::DialogTypeError, e2.what());
}
catch (...)
{
UI::GetUI()->NXMessageBox()->Show("Exception", NXOpen::NXMessageBox::DialogTypeError, "Unknown Exception.");
}
}
//------------------------------------------------------------------------------
// Unload Handler
//------------------------------------------------------------------------------
extern"C" DllExport int ufusr_ask_unload()
{
return (int)NXOpen::Session::LibraryUnloadOptionImmediately;
}
2.打开IDA Pro,选择上⾯代码编译⽣成的C++ dll开始反编译
打开界⾯如下
点击Exports
我们可以查看到ufusr这个⼊⼝函数
点击Import
我们可以查看到当前这个dll⾥所调⽤的所有UFUN函数和NXOPEN⽅法,以及这个UFUN函数出⾃哪个.dll⾥
下⾯我们开始根据逻辑流程去反编译代码
我们都知道nx⼆次开发的dll都是由ufusr这个⼊⼝函数开始加载的
我们先去函数窗⼝中到ufusr_0这个函数,双击打开它,右侧弹出代码逻辑流程图
下⾯开始解析介绍怎么看流程
⿏标缩⼩拖动到最上⾯的块,从ufusr开始看
然后顺着箭头往下,我们到了try 到了new,在往下我们就看到了MyClass::MyClass(void),是不是很熟悉,刚好这⾥和我们写的代码对应上了。//------------------------------------------------------------------------------
// Entry point(s) for unmanaged internal NXOpen C/C++ programs
//------------------------------------------------------------------------------
/
/  Explicit Execution
extern"C" DllExport void ufusr( char *parm, int *returnCode, int rlen )
{
try
{
// Create NXOpen C++ class instance
MyClass *theMyClass;
theMyClass = new MyClass();
theMyClass->do_it();
delete theMyClass;
}
catch (const NXException& e1)
{
UI::GetUI()->NXMessageBox()->Show("NXException", NXOpen::NXMessageBox::DialogTypeError, e1.Message());
}
catch (const exception& e2)
{
UI::GetUI()->NXMessageBox()->Show("Exception", NXOpen::NXMessageBox::DialogTypeError, e2.what());
}
catch (...)
{
UI::GetUI()->NXMessageBox()->Show("Exception", NXOpen::NXMessageBox::DialogTypeError, "Unknown Exception.");
}
}
看到这⾥,我们在往下,到了do_it,我们知道⼀般⽤NX C++向导模板写代码就是往do_it处写的。
这⾥我们直接双击点击do_it
看到这⾥是不是就⼀⽬了然了,这就是我们平时最熟悉的ufun函数了,直接就可以看到⾃⼰写的这个函数⾥到底⽤了哪些API函数了。然后在根据函数和for if对应的流程结构图来推算功能的逻辑算法,⾃⼰就可以重写复制功能了。
我们在回到⼀开始的总流程图⾥,点ufusr_0,我们可以到对应的NXOPEN的⽅法,所有的东西都在流程图上,⾃⼰点击去慢慢看IDA Pro更多⽤法
阿飞
2021年8⽉8⽇

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