fopen with PATH constant issue

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Hi,

I am creating/opening a file using,

C++

FILE *file = fopen(" C:\\ABC\\Poo.txt","w+");
if(file == NULL)
printf("un sucessful");
else
printf("sucessful");

I am able to create a file name poo.txt on C:\ABC folder.

Now I used,

C++

#define PATH "C:\\ABC\\"
FILE *file = fopen(" PATH+Poo.txt","w+");

OR

C++

#define PATH "C:\\ABC"
FILE *file = fopen(" PATH\\Poo.txt","w+"); 
if(file == NULL)
........

File is not get created without any error.
How can I use PATH constant with file name in fopen?
Please help me out.
Thanks in advance.

Posted 8-Apr-10 20:03pm

Poonamol

Updated 8-Apr-10 21:39pm

CPallini

v4

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3 solutions

Solution 3

Nice One.
This is simple and workable solution.

But if my filename is stored in one variable then how I'll use fopen.
Using Sprintf/strcat only?

Thanks a lot.

Posted 8-Apr-10 22:01pm

Poonamol

Updated 8-Apr-10 22:17pm

v2

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Eugen Podsypalnikov · Accepted Answer · 2010-04-08T20:27:00

Try it :) :

#define MAX_PATH 256
#define ROOT_DIR "C:\\ABC\\"

// 1)
{
  char szPathedFileName[MAX_PATH] = {0};
  sprintf(szPathedFileName, "%s%s", ROOT_DIR, "test.txt");
  // use the buffer now
...
}

// 2)
{
  char szPathedFileName[MAX_PATH] = {0};
  strcat(szPathedFileName, ROOT_DIR);
  strcat(szPathedFileName, "test.txt");
  // use the buffer now
...
}

When you will get any compiler errors here -
please see the secure replcement with: strcpy_s and sprintf_s :)

CPallini · Accepted Answer · 2010-04-08T21:42:00

Solution 2

Poonamol wrote:
FILE *file = fopen(" PATH+Poo.txt","w+");

Change to

C++

FILE *file = fopen(PATH "Poo.txt", "w+");

:)

Posted 8-Apr-10 21:42pm