How to read structure data using read process memory API

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Hi Guys,
Currently I am using ReadProcessMemory API to read the values of variables from an exe and I am also getting the types of the variables using DBGhelp.lib API's.
But as of now I am able to handle primitive dataTypes.
But now I want to read structure data. I am unable to figure out how to make it work.

Below is the structure in which I want to read the values.

C++

typedef struct RXDATA
{
  CAN_DATA Rx_Data;
  unsigned char abc;
  unsigned char bcd_Type ;
} CAN_TS_RECEIVE;

Posted 20-Sep-11 23:53pm

explorerC

Updated 20-Sep-11 23:55pm

André Kraak

v2

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Sergey Alexandrovich Kryukov 21-Sep-11 9:50am

What is CAN_DATA? another structure? Is anything allocated in heap?
--SA

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Sergey Alexandrovich Kryukov · Accepted Answer · 2011-09-21T03:57:00

Please see my comment to the question.

A single call to ReadProcessMemory reads consecutive block of memory from the foreign process. So, if you have structured data in the form of structure composed of primitive types and other structures, and all of the composed structures are also like that, your target structure is in the consecutive block of memory and could be transferred in one call. Use sizeof operator to find the value for the nSize parameter.

If this is not the case, the problem is a bit more complex but also not too hard; you will need to find all pointers pointing to a separate block of memory (in heap, for example) and call this API several times and than assemble the result in the structure of your calling process, allocating memory where needed. You just need to picture the memory structure of your data type clearly.

—SA