problem of c structure in .net

ganesh_ghodke · #1 24-Aug-2005, 04:35

Hello,

I am working on c project. it currently shifted from Linux to windows and compiled in .net 2003. after running code, I got problem in printing value of double member which is present in structure. at debug time , i seen that value coming in to double variable but can't print by any type specifier like %f,%g etc. it's problem with structure declaration. if change location of double from middle to end of struct, it work!

Can any one explain me why this happen? (I got solution for this problem using pragma pack directive. but i have to know, why this happen only with .net not on gcc or other c compiler.) This is related to boundary setting of structure. plz help me to understand. Thanks.

Cheers,

maprich · #2 24-Aug-2005, 08:06

Since your question is .NET related, please go to this forum.

And please post them also snippets of your code so that your question can be more readily answered.

ganesh_ghodke · #3 25-Aug-2005, 01:12

plz reply some thing, so that i can got some hint!
thanks.

LuciWiz · #4 25-Aug-2005, 02:10

Quote:

Originally Posted by ganesh_ghodke

plz reply some thing, so that i can got some hint!
thanks.

I will only move this thread to the .NET Forum, if the code uses Managed Extensions; since you were able to port it to the new VC compiler (7.x is part of VS.NET, but it has 2 components, and the one you used is just a revised version of the plain c++ compiler from the previous versions) from gcc - I guess not.
maprich asked you to show us the code you used; there's no way we can figure it out without seeing what you did.

Best regards,
Lucian

ganesh_ghodke · #5 25-Aug-2005, 05:15

Quote:

Originally Posted by LuciWiz

I will only move this thread to the http://www.gidforums.com/f-49.html, if the code uses Managed Extensions; since you were able to port it to the new VC compiler (7.x is part of VS.NET, but it has 2 components, and the one you used is just a revised version of the plain c++ compiler from the previous versions) from gcc - I guess not.
maprich asked you to show us the code you used; there's no way we can figure it out without seeing what you did.

Best regards,
Lucian

Thanks for reply. the code for struct is like

CPP / C++ / C Code:

 typedef struct my_info {
  time_t tim;

  int sent;
  int received;
  int sent;
  int received;
 
    #if defined(MON) 
    double b_sent;        //this double gives problem (for int data type it work)
    #else 
    int b_sent;
    #endif
    
    int b_received;
    int all_mem;
    int max_mem;
  
  int length;
  int size;
  int count;
  
  int conns;		
  int conn_info;		
  CONN_INFO *conn_info;   //anther structure pointer
} INFO;

anther structure which contain double it work fine. if i move this double varible at end of struct it work.

thanks.

maprich · #6 25-Aug-2005, 09:56

Please post also:

The code that declares a variable of type INFO
The code that assigns value to your structure member "b_sent"
The code that prints out the structure member "b_sent"

Because the structure itself seems to be valid

Please use code tags [c] and [/c] to make your code readable.

ganesh_ghodke · #7 26-Aug-2005, 03:58

Thanks for reply. I am not sending code because nothing is wrong in code only problem related to .net.

After debugging code, I got problem in pointer addressing. when i copy information to structure pointer A and address of A is assign to other structure pointer B. The values are copied successfully but only value of double member of A is printed but not by B.

code is like

CPP / C++ / C Code:

 function1()
{

INFO *B;

             //some code statement

get_info(&b);

            //print info of B         (Double member print 0 value)
}

get_info( INFO **B)
{
INFO *A;
           //enter info in to A structure member

//print A value        (*****it works)
*B=&A;

}

ganesh_ghodke · #8 26-Aug-2005, 05:14

Also one thing,
The get_info() function in another c file and function1() in another c file. the structure in get_info() function file declared static. is there any problem in accessing value using address from different c files in same project?

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