Thread: Visual Studio C Help

Create the Project:
File->New->Project
Select "General" and "Empty Project".

Change the Project Settings:
In the Solution Explorer, right-click your new project and click Properties.
Change the Configuration pull down to "All Configurations".
Go to C/C++ -> General.
Change to Warning Level 4, and Treat Warnings As Errors = Yes.
Go to C/C++ -> Advanded.
Change to "Compile As C".
Click Apply & OK.

Add existing files to the project:
In the Solution Explorer, right-click on the Header Files or Source Files folder under your project and click Add->Existing Item.
Choose your file and add it.

Add new files to the project:
In the Solution Explorer, right-click on the Header Files or Source Files folder under your project and click Add->New Item.
Choose "Header File (.h)" or "C++ File (.cpp)", give it a name (with a .h or .c extension) & click OK.

Ahhh, this is ridiculous. I've been through every option in Visual Studio, why the heck doesn't this crap work.

Perhaps this is not correct?

#include <stdio.h>
#include <string.h>
#include "hashTable.c"
#include "hashTable.h"

But putting it in <> gives an error that the hashTable.c file doesn't exist.

Originally Posted by cpjust

Post the exact errors you're getting, and the code (or relevant parts if it's big).

One thing that might be part of the problem would be if you didn't install the Platform SDK.
You'll need it eventually, so even if it's not the problem, you might as well install it...

Oh, and one other thing that might be the cause - In the Project Properties, in C/C++ -> General, make sure you have the path to your .h files in the "Additional Include Directories" if they aren't in the same directory as the VC++ project.

Sure. It's pretty big though. Let me see if I can comment out a lot of crap and still get the relevant error to appear.

Originally Posted by Paul22000

#include "hashTable.c"

Don't #include .c files.

Originally Posted by robwhit

Don't #include .c files.

Why not? Works fine in Unix?

It's not the way to do multi-file projects. Usually you compile each source file separately. That way, you can use a makefile or an IDE, so that you don't have to compile as much each time you recompile if you are fixing something in one file.

hashTable.h:

Code:

#ifndef HASHTABLE_H
#define HASHTABLE_H

struct wordCount
{
  char *word;
  int count;
};

typedef struct wordCount HT_Element;
typedef struct wordCount *HT_Element_Ptr;


// Paul22000: Removed A LOT of comments for each method below for simplicity:

extern void HT_initialize(int n);
extern void HT_cleanup();
extern HT_Element_Ptr HT_lookup(char *s);
extern HT_Element_Ptr HT_install (char *word);
extern int HT_getNrOfSlots();
extern int HT_getNrOfElements();
extern HT_Element HT_getFirstElement();
extern HT_Element HT_getNextElement();

#endif

-----

main.c:
(Literally commented everything out for this post, to show errors)

Code:

#include <stdio.h>
#include <string.h>
#include "hashTable.c"

int main()
{
  // commented everything out, still get errors

  return 0;
}

-----

The Errors:

Code:

1>------ Build started: Project: Project2, Configuration: Debug Win32 ------
1>Linking...
1>countWords.obj : error LNK2005: _HT_initialize already defined in hashTable.obj
1>countWords.obj : error LNK2005: _HT_lookup already defined in hashTable.obj
1>countWords.obj : error LNK2005: _hash already defined in hashTable.obj
1>C:\Documents and Settings\Paul\My Documents\Visual Studio 2008\Projects\countWords\Debug\Project2.exe : fatal error LNK1169: one or more multiply defined symbols found
1>Build log was saved at "file://c:\Documents and Settings\Paul\My Documents\Visual Studio 2008\Projects\countWords\countWords\Debug\BuildLog.htm"
1>Project2 - 4 error(s), 0 warning(s)
========== Build: 0 succeeded, 1 failed, 0 up-to-date, 0 skipped ==========

And here's hashTable.c, it doesn't really help, which is why I put it last in the post, so feel free to ignore this completely.

(Ignore all the crap going on in the functions, I'm in the middle of implementing them but having quit a lot of trouble)

Code:

#include <stdlib.h>
#include <stdio.h>
#include <string.h>

#ifndef HASHTABLE_H
#define HASHTABLE_H

#define HASHSIZE 50000

/* =================================
 * Type Declarations:
 */

unsigned hash(char *s);

struct wordCount
{
  char *word;
  int count;
};


typedef struct wordCount HT_Element;
typedef struct wordCount *HT_Element_Ptr;

struct llistelem
{
  HT_Element hte;
  struct llistelem *next;
};

typedef struct llistelem LL_Element;

LL_Element *myhashtable;

/* ==============================================================
 * Function Declarations:
 */

void HT_initialize(int n)
{
  myhashtable = (LL_Element *)calloc(n, sizeof(LL_Element));
}

extern void HT_cleanup();


/////////////////////////////////////////////////////////////////////
// Ignore all this crap, I'm in the middle of implementing these functions, and have no idea how to do it

HT_Element_Ptr HT_lookup(char *s)
{
  //np = &myhashtable[0];
  //printf("test1: &#37;s\n", np->hte.word);

  LL_Element *np = (LL_Element *)calloc(1, sizeof(LL_Element));

        int x = 0;
  for (np = &myhashtable[hash(s)]; np != NULL; np = np->next)
  {
                printf("%s\n", np->hte.word);
                x++;
  }
    //if (strcmp(s, np->hte.word) == 0)
    //return NULL;//&np; /* found */
  return NULL; /* not found */
}

extern HT_Element_Ptr HT_install (char *word);
extern int HT_getNrOfSlots();
extern int HT_getNrOfElements();
extern HT_Element HT_getFirstElement();
extern HT_Element HT_getNextElement();

unsigned hash(char *s)
{
  unsigned hashval;
  for (hashval = 0; *s != '\0'; s++)
    hashval = *s + 31 * hashval;
  return hashval % HASHSIZE;
}

#endif /* HASHTABLE_H */

Originally Posted by robwhit

It's not the way to do multi-file projects. Usually you compile each source file separately. That way, you can use a makefile or an IDE, so that you don't have to compile as much each time you recompile if you are fixing something in one file.

How do you do this? Compiling each separately etc

Yeah, I was using a makefile when I was doing it in Putty/Unix.

Anywho, I posted my code. Mind taking a look at the errors and seeing what I'm doing wrong?

Funny, so far hours wasted at this, and I'm not even working on the project. Maybe it's just not worth it? Putty is a pain in the ass but at least it works

Did you #include "hashtable.h" in countwords.c?
Function prototypes are automatically extern. You don't need to put the extern there.