access violation error while trying to memset() the typedef element of the struct

bamsi

Hi All,
I have a typedef element defined inside the struct which i am trying to assign value using the memset and strcpy function.I am able to compile but while running it give me access violation error.Here is my code

Expand|Select|Wrap|Line Numbers

 **********

#ifndef DEFINE_SAMPLETYPES

#define DEFINE_SAMPLETYPES
 
typedef char MANUFACTURER_PART_NUMBER[48];
 
#endif
 
*******************************************

#ifndef DEFINE_SAMPLE_WKSP

#define DEFINE_SAMPLE_WKSP

#include "SAMPLETYPEDEF.H"

typedef struct{
 
MANUFACTURER_PART_NUMBER manufacturer_part_number;
 
}IN_SAMPLE_WKSP;
 
#endif

****************************

#include "SAMPLE_WKSP.H"
 
 IN_SAMPLE_WKSP *po;
 
 main()

 {
 
memset(&(po)->manufacturer_part_number,' ',48);

strcpy(&(po)->manufacturer_part_number,"hello");
 
}

can you guide me where i am doing mistake.Is this correct way of accessing the typedef element in a struct.

Thanks for the Help

ashitpro

Quote:

Originally Posted by bamsi

Hi All,
I have a typedef element defined inside the struct which i am trying to assign value using the memset and strcpy function.I am able to compile but while running it give me access violation error.Here is my code
**********
#ifndef DEFINE_SAMPLETYPES
#define DEFINE_SAMPLETYPES

typedef char MANUFACTURER_PART_NUMBER[48];

#endif

*******************************************
#ifndef DEFINE_SAMPLE_WKSP
#define DEFINE_SAMPLE_WKSP
#include "SAMPLETYPEDEF.H"
typedef struct{

MANUFACTURER_PART_NUMBER manufacturer_part_number;

}IN_SAMPLE_WKSP;

#endif
****************************
#include "SAMPLE_WKSP.H"

IN_SAMPLE_WKSP *po;

main()
{

memset(&(po)->manufacturer_part_number,' ',48);
strcpy(&(po)->manufacturer_part_number,"hello");

}

can you guide me where i am doing mistake.Is this correct way of accessing the typedef element in a struct.

Thanks for the Help

According to my knowledge,
you ll have to first allocate the memory to IN_SAMPLE_WKSP *po;
then do your memset and other logic.

donbock

Another way to put it is that po is an uninitialized pointer. You need to initialize it to point at an IN_SAMPLE_WKSP.

Banfa

Quote:

Originally Posted by bamsi

Expand|Select|Wrap|Line Numbers

 memset(&(po)->manufacturer_part_number,' ',48);

strcpy(&(po)->manufacturer_part_number,"hello");

Even if you initialise po correctly these lines are not correct the & is unnecessary. This effects the type, rather than the value, of the pointer but most good compilers would issue a warning for this.

access violation error while trying to memset() the typedef element of the struct

re: access violation error while trying to memset() the typedef element of the struct

re: access violation error while trying to memset() the typedef element of the struct

re: access violation error while trying to memset() the typedef element of the struct

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