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copying and repopulating a struct instance with pointers

Discussion in 'C' started by ashwinkumar18, Oct 10, 2011.

  1. ashwinkumar18

    ashwinkumar18 New Member

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    I am working on a tool in windows c++.
    I have a c++ structure which has the following format

    Code:
    typedef struct node {
          int open;
          int version;
          const unsigned long long * data;
          char* flags;
        }_node;
    It is a handle to a binary file. I am doing API interception and I get this pointer from an internal API call being made by the application.

    Also The data field in the structure above is a pointer to instances of two structures laid out contiguously. The two structures are as follows.

    Code:
     typedef struct header{
          unsigned int open;
          unsigned int version;
          unsigned long long int length;
        } _header;

    Code:
     typedef struct body{
          unsigned int v1, v2, v3, v4, v5, v6, v7, v8, v9, v10;
          unsigned long long int ll1, ll2;
        } _body;

    I am able to access and print the data field as follows.


    Code:
        _node* First=(node *)address;//Address is a pointer that i get from intercepting an application
        _header* nodeHeader=(_header*)First->data;
        char *bodyPtr=(char *)(nodeHeader+1);
        _body* nodeBody=(_body *)(bodyPtr);
        unsigned long long int offset=0;
    
        while(!(nodeBody->v1 & 1) && offset< nodeHeader->length)
        {
         nodeBody=(_body*)(bodyPtr+offset);
         offset=nodeBody->v2+nodeBody->v3;
        }
    
    I want to write the struct node instance into a text file and be able to read it back into a struct instance later. What is the best way to do it? I want an answer in c++


    I want a c++ code because the code I am working on is in c++. The code i posted here has typedef because people who wrote the structure has written it in C.
     

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