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06.13.2008 at 07:38PM PDT, ID: 23484496
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Global pointer problems

Asked by software_architect in C Programming Language

Tags: C

Hello List,
When the program reaches line 90, I am not sure why I would get no content in ctxt->sdiUser and the strange "s" in ctxt->sdiRequest, as shown in the snapshot in the png file attached.
Just in case of problems accessing, I have attached the completed code as a txt file as well.
The code compiles with no errors.

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#include <string.h>
#include <stdio.h>
#include <stdlib.h>
#define AR_MAX_DEFAULT_SIZE 255
 
typedef struct
{
int iInitRun;
char *sdiRequest;
char *sdiResponse;
char *sdiUser;
char *sdiPwd;
char *sdiQ;
char *sdiBrokerList;
} Context;
 
void CreateInstance(void **);
void GLEWF(void **);
void talker(void **);
void onMessage(void **);
void Init(void **);
void DeleteInstance(void **);
void PrintContext(void **);
 
void PrintContext(void **object)
{
    Context *printCtxt = (Context *)object;
//    if((int *)printCtxt->iInitRun != 0)
//    fprintf(stdout,"InitRun - %d\n",printCtxt->iInitRun);
    if(printCtxt->sdiRequest != NULL)
    fprintf(stdout,"sdiRequest - %s\n",printCtxt->sdiRequest);
    if(printCtxt->sdiResponse != NULL)
    fprintf(stdout,"sdiResponse - %s\n",printCtxt->sdiResponse);
    if(printCtxt->sdiUser != NULL)
    fprintf(stdout,"sdiUser - %s\n",printCtxt->sdiUser);
    if(printCtxt->sdiPwd != NULL)
    fprintf(stdout,"sdiPwd - %s\n",printCtxt->sdiPwd);
    if(printCtxt->sdiQ != NULL)
    fprintf(stdout,"sdiQ - %s\n",printCtxt->sdiQ);
    if(printCtxt->sdiBrokerList != NULL)
    fprintf(stdout,"sdiBrokerList - %s",printCtxt->sdiBrokerList);
}
 
void CreateInstance(void **object)
{
  Context *context;
 
  if (object != NULL)
    *object = NULL;
 
  context = (Context *) malloc(sizeof(Context));
 
  if (context == NULL)
  {
    fprintf(stdout,"CI:Error memory allocation for Context");
    return;
  }
 
 
  *object = (void *) context;
  context->sdiUser = (char *)malloc(AR_MAX_DEFAULT_SIZE);
  context->sdiPwd = (char *)malloc(AR_MAX_DEFAULT_SIZE);
  context->sdiQ = (char *)malloc(AR_MAX_DEFAULT_SIZE);
  context->sdiBrokerList = (char *)malloc(AR_MAX_DEFAULT_SIZE);
 
  strcpy(context->sdiUser,"CI:User");
  context->sdiUser[AR_MAX_DEFAULT_SIZE]='\0';
  strcpy(context->sdiPwd,"CI:Pwd");
  context->sdiPwd[AR_MAX_DEFAULT_SIZE]='\0';
  strcpy(context->sdiQ,"CI:Q");
  context->sdiQ[AR_MAX_DEFAULT_SIZE]='\0';
  strcpy(context->sdiBrokerList,"CI:Broker");
  context->sdiBrokerList[AR_MAX_DEFAULT_SIZE]='\0';
 
  //PrintContext(*object);
 
  Init(*object);
}
 
void DeleteInstance(void **object)
{
    Context       *context = (Context *) object;
    PrintContext(*object);
    free(context);
}
 
void GLEWF(void **object)
{
    Context *ctxt = (Context *)object;
    ctxt->sdiRequest = (char *)malloc(AR_MAX_DEFAULT_SIZE);
    strcpy(ctxt->sdiRequest,"From GLEWF:Hello World");
    ctxt->sdiRequest[AR_MAX_DEFAULT_SIZE]='\0';
    PrintContext(*object);
    talker(*object);
    free(ctxt->sdiRequest);
}
 
void talker(void **object)
{
    Context *talkCtxt = (Context *) object;
    fprintf(stdout,"talker:%s\n",talkCtxt->sdiRequest);
    strcpy(talkCtxt->sdiResponse, "From talker:Response");
}
 
void Init(void **object)
{
    Context *initCtxt = (Context *)object;
    fprintf(stdout,"Init:%s\n",initCtxt->sdiUser);
    strcpy(initCtxt->sdiUser,"From Init:Reuben");
}
 
int main()
{
    void **obj;
    CreateInstance(*obj);
    GLEWF(*obj);
    DeleteInstance(*obj);
    //printf("Hello world!\n");
    return 0;
}
Attachments:
 
ptr-problem.png (20 KB) (File Type Details) 
error_snap
error_snap
 
 
main.txt (3 KB) (File Type Details) 
Code
 
[+][-]06.13.2008 at 08:52PM PDT, ID: 21784004

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[+][-]06.13.2008 at 09:25PM PDT, ID: 21784072

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[+][-]06.13.2008 at 09:41PM PDT, ID: 21784110

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[+][-]06.13.2008 at 09:42PM PDT, ID: 21784112

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[+][-]06.13.2008 at 09:44PM PDT, ID: 21784113

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[+][-]06.13.2008 at 09:47PM PDT, ID: 21784118

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[+][-]06.13.2008 at 09:53PM PDT, ID: 21784129

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[+][-]06.13.2008 at 09:54PM PDT, ID: 21784134

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[+][-]06.14.2008 at 12:07AM PDT, ID: 21784387

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[+][-]06.14.2008 at 12:45AM PDT, ID: 21784499

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[+][-]06.14.2008 at 01:06AM PDT, ID: 21784554

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About this solution

Zone: C Programming Language
Tags: C
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Solution Provided By: rowansmith
Participating Experts: 3
Solution Grade: A
 
 
[+][-]06.16.2008 at 06:04AM PDT, ID: 21793144

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[+][-]06.16.2008 at 06:12AM PDT, ID: 21793211

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