C / C++ / MFC

1. Read the question carefully
   
2. Understand that English isn't everyone's first language so be lenient of bad spelling and grammar
   
3. If a question is poorly phrased then either ask for clarification, ignore it, or mark it down. Insults are not welcome
   
4. If the question is inappropriate then click the 'vote to remove message' button
   

1. Choose the correct forum for your message. Posting a VB.NET question in the C++ forum will end in tears.
   
   
2. Be specific! Don't ask "can someone send me the code to create an application that does 'X'. Pinpoint exactly what it is you need help with.
   
   
3. Keep the subject line brief, but descriptive. eg "File Serialization problem"
   
   
4. Keep the question as brief as possible. If you have to include code, include the smallest snippet of code you can.
   
   
5. Be careful when including code that you haven't made a typo. Typing mistakes can become the focal point instead of the actual question you asked.
   
   
6. Do not remove or empty a message if others have replied. Keep the thread intact and available for others to search and read. If your problem was answered then edit your message and add "[Solved]" to the subject line of the original post, and cast an approval vote to the one or several answers that really helped you.
   
   
7. If you are posting source code with your question, place it inside <pre></pre> tags. We advise you also check the "Encode HTML tags when pasting" checkbox before pasting anything inside the PRE block, and make sure "Ignore HTML tags in this message" check box is unchecked.
   
   
8. Be courteous and DON'T SHOUT. Everyone here helps because they enjoy helping others, not because it's their job.
   
   
9. Please do not post links to your question in one forum from another, unrelated forum (such as the lounge). It will be deleted.
   
   
10. Do not be abusive, offensive, inappropriate or harass anyone on the boards. Doing so will get you kicked off and banned. Play nice.
    
    
11. If you have a school or university assignment, assume that your teacher or lecturer is also reading these forums.
    
    
12. No advertising or soliciting.
    
    
13. We reserve the right to move your posts to a more appropriate forum or to delete anything deemed inappropriate or illegal.

2 Errors:
a) Lambda does not not with static var, so I must to work wwith bind
b) I try to invoke functions of class from DLL, saved in unordered_map object and fall.If to invoke functions of class not from DLL it is work properly.
How can this problem be solved?


	file UnorderedMapFunctions.cpp
<pre lang="C++">#include <iostream>
#include <unordered_map>
#include <functional>
#include <windows.h>

#include "..\\Geometry\\Geometry.h"
using namespace std;

namespace NS
{
  class Math
  {
  public:
    int Sum(int x, int y) { return x + y; }
    int Sub(int x, int y) { return x - y; }
    int Mul(int x, int y) { return x * y; }
    int Div(int x, int y) { return x / y; }
  };
}
using namespace NS;

int main()
{
  unordered_map<string, function<int(int, int)>>* mydata = new unordered_map<string, function<int(int, int)>>;
  Math* m = new Math;
 
  // Using lambda functions to bind member functions
  (*mydata)["sum"] = [m](int x, int y) { return m->Sum(x, y); };
  (*mydata)["sub"] = [m](int x, int y) { return m->Sub(x, y); };
  (*mydata)["mul"] = [m](int x, int y) { return m->Mul(x, y); };
  (*mydata)["div"] = [m](int x, int y) { return m->Div(x, y); };
  /*
  //Geometry* g = new Geometry;
  (*mydata)["circle"] = [g](int x, int y) { return g->Circle(x, y); };
  (*mydata)["rectangle"] = [g](int x, int y) { return g->Rectangle(x, y); };
  */
  //==============================================================
  string fullname_dll = "Geometry";
  HINSTANCE hInst = LoadLibraryA(fullname_dll.c_str());
  if (hInst == nullptr)
  {
    cout << "Error: [FuncImport] wrong name " << fullname_dll.c_str() << endl;
    return false;
  }
  typedef void (CALLBACK* CreateInstanceFunc)(unordered_map<string, function<int(int, int)>>* mydata);
  string CreateFuncName = "CreateInstance"; 
  CreateInstanceFunc CreateInstance = (CreateInstanceFunc)GetProcAddress(hInst, CreateFuncName.c_str()); 
  if (CreateInstance == nullptr)
  {
    cout << "Error: wrong name " << fullname_dll << endl;
    FreeLibrary(hInst);
    return false;
  }
  CreateInstance(mydata);
  cout << "Imported " << fullname_dll.c_str();
  FreeLibrary(hInst);
  //==============================================================
  // Invoke by 'key' functions, saved in 'mydata'
  // it is right! 
  for (const auto& [k, v] : *mydata)
    std::cout << "Key: " << k << " Value: " << v(3, 5) << std::endl;
  //===================================
  auto it = mydata->find("circle");
  if (it != mydata->end())
   // Exception thrown: read access violation.
   // fault in functional.h line 920
   // it->second.vfptr = addr(??? ??? ??? ??? ???)
    cout << "\nKey: " << it->first << " Value: " << it->second(4, 2) << std::endl;
  else
    cout << "Error\n";
  //===================================

  delete m;
  delete mydata;
  return 0;
}

#pragma once
#include <iostream>
#include <unordered_map>
#include <functional>
#include <windows.h>

#ifdef GEOMETRY_EXPORTS
#define GEOMETRY_API __declspec(dllexport)
#else
#define GEOMETRY_API __declspec(dllimport)
#endif

using namespace std;
namespace NS
{
  class GEOMETRY_API Geometry
  {
  public:
    Geometry();
    int Circle(int x, int y);
    int Rectangle(int x, int y);
  };
  extern "C" void  GEOMETRY_API  CreateInstance(unordered_map<string, function<int(int, int)>>* mydata);
  extern "C" void  GEOMETRY_API  Cleanup();
}

#include "pch.h"
#include "Geometry.h"

namespace NS
{
   Geometry* geometryInstance;
  void CreateInstance(unordered_map<string, function<int(int, int)>>* mydata)
  {
    geometryInstance = new Geometry;
    // Can't capture a static variable in a lambda
    //(*mydata)["circle"] = [geometryInstance](int x, int y) { return geometryInstance->Circle(x, y); };
    //(*mydata)["rectangle"] = [geometryInstance](int x, int y) { return geometryInstance->Rectangle(x, y); };

    (*mydata)["circle"] = bind(&Geometry::Circle, geometryInstance, placeholders::_1, placeholders::_2);
    (*mydata)["rectangle"] = bind(&Geometry::Rectangle, geometryInstance, placeholders::_1, placeholders::_2);
  }
  Geometry::Geometry() {}
  int Geometry::Circle(int x, int y) { return 3.14 * x * x; }
  int Geometry::Rectangle(int x, int y) { return x * y; }
  void Cleanup()
  {
        delete geometryInstance;
        geometryInstance = nullptr;
  }
}

Prepare the following strings in advance as an array. Be sure to write everything in full-width characters.
"The difference between being 18 and 81. 18 years old is the one who drowns in love, 81 years old is the one who drowns in the bath. 18 years old is the one who runs down the road, and vice versa.
The person running is 81 years old. An 18-year-old has a fragile heart, and an 81-year-old has a fragile bone. I'm 18 years old and my heart can't stop pounding.
He is 81 years old and can't stop the plane. An 18-year-old can choke on love, and an 81-year-old can choke on rice cakes. I'm concerned about the deviation value
I am 18 years old, and I am 81 years old and concerned about my blood pressure and blood sugar levels. An 18-year-old who doesn't know anything yet, an 81-year-old who doesn't remember anything anymore.
An 18-year-old who is looking for himself, and an 81-year-old who is looking for everyone else. "
- Then have the user enter a search string. Search characters can be up to 10 characters.
・Then, have the user enter a replacement string. Replacement characters can be up to 10 characters.
- Perform a prefix match search on the above string and replace all hit strings.
- After replacing, output the result to the screen. If there are no conversion candidates, "Nothing to convert" is displayed.(if the searched string is in more than 1 place on the original string, the replacement will replace all of it)

Community Verified icon