Memory alignment causes crash using Visual C++ -

While retyping some existing code on the better stream line, I suffered an accident during my trial, which I On the issue of compressed memory alignment, but I'm not sure how to fix it without masking the problem.

I am using Microsoft Visual Studio 2008.

I have two files.

FileA.cpp

  class squares: public base class {public: a () throw (); ~ A () throw (); Virtual Init () throw (); Virtual Int start () Throw (); Virtual It Stop () Throw (); Virtual Zero Cleanup () Throw (); Public: int * pap; Handle m_evTimerStop; Unsigned char m_ctrl; CAtlList & LT; Integer & gt; M_list; }   
 In FileA.cpp, when I use m_list, it's all right.  
 In FileB.cpp I have declared a global variable  
  extern ClassA g_pCA;   
 So if some functions go to use m_list:  
 g_pCA-> M_list.RemoveAt (pos);  
 It crashes if I call: g_pCA-> gt; M_list.GetCount ();  
 In FileA, the count will be the correct number, say 10 elements. But in FileB, the count is sometimes negative in some random numbers. You get the picture.  
 That's why I managed to track the fact that the file MCP link in the ACPP is at 0x9caba5 address, but the file is on BQP, M_list 0x9caba8. There is a 3 byte difference that made me doubt the memory alignment.  
 If I transpose the m_list above m_ctrl, then the problem is resolved,  
 or if I changed m_ctrl from an unsigned character to an int, then alignment The cause is clearly fixed.  
 I do not understand that implementing different memory alignment rules in different compiler files  
 Any compiler flags to make this resolution?  
 Thanks ... AMRO   
 
 
 About my estimate  Correct, if #pragma pack is correct, "just do something like this, pack only those structures that really need it":  
  # Pragma pack (push) # Purgama Pack (1) Straight Some _That_ needs_to_be_packed {....}; #pragma pack (pop)   
 Now your data is packaged, but other data structures will not be affected.