Re: Problem in writing structure to Binary file in C lang
- From: Prashu <prashanthkumar.chanda@xxxxxxxxx>
- Date: Mon, 21 Apr 2008 13:20:16 -0500 (CDT)
On Apr 19, 2:11 am, zehra...@xxxxxxxxx wrote:
Hi,
I had written application for storing employee data in binary file and
reading those data from binary file and display it in C language.
But I face some issue with writing data to binary file.
Here is my part of my code.
struct cust_data
{
int nCAFID;
char *szFirstName;
};
typedef struct cust_data CUST_DATA;
CUST_DATA *pCustdata = NULL;
int AddRecord()
{
FILE *fp;
fp = fopen("Input.dat","ab+");
return fp;
pCustdata = malloc(sizeof(CUST_DATA));
pCustData->szFirstName = malloc(sizeof(pCustData-
szFirstName));
printf("Enter CAFID : ");
scanf("%d",&pCustData->nCAFID);
printf("Enter First Name : ");
scanf("%s",pCustData->szFirstName);
fwrite(pCustData,sizeof(CUST_DATA),1,fp);
fclose(fp);
free(pCustData->szFirstName);
free(pCustData)
}
now here when i write a structure to file, it writes nCAFID and
inplace of szFirstName it writes pointer to string.
But i need to write string..
if i take szFirstName as char array then it is wroking fine.....but i
want to use heap memory instead of stack..
can anyone help me..................??
thanks in advance.............
--
comp.lang.c.moderated - moderation address: c...@xxxxxxxxxxxx -- you must
have an appropriate newsgroups line in your header for your mail to be seen,
or the newsgroup name in square brackets in the subject line. Sorry.
---pCustdata = malloc(sizeof(CUST_DATA));
By above statement .. you are allocating the memory for structure..
--pCustData->szFirstName = malloc(sizeof(pCustData->szFirstName))
By above statement you are allocating only "sizeof(pCustData-
szFirstName))" which may be max of 4 .. Try with allocating morememory to this structure ....
like .. pCustData->szFirstName = malloc(sizeof(char) * 100);
--
comp.lang.c.moderated - moderation address: clcm@xxxxxxxxxxxx -- you must
have an appropriate newsgroups line in your header for your mail to be seen,
or the newsgroup name in square brackets in the subject line. Sorry.
.
- References:
- Problem in writing structure to Binary file in C lang
- From: zehra . mb
- Problem in writing structure to Binary file in C lang
- Prev by Date: Re: signal catching not work
- Next by Date: Re: Promotions while delivering parameters
- Previous by thread: Re: Problem in writing structure to Binary file in C lang
- Next by thread: Re: Problem in writing structure to Binary file in C lang
- Index(es):
Relevant Pages
|
