mkdir problem

[newbieKing]

Hi, I've got a problem with my mkdir function. After I call mkdir a string called "file_name" gets altered.
Do you have any idea what is going on?

cout << file_name << "\n"; // name displayed
mkdir(output_dir);
cout << file_name << "\n"; // name not displayed

Thank you!

 

[xwb]

What are file_name and output_dir? Are they const char*, CString, std::string?

 

[newbieKing]

they are both

char *

a character pointer. I did not declare them as const... do I need to?

 

[cpjust]

How does it get altered? What is the value of file_name before and after calling mkdir()?
What OS and compiler are you using?

Can you write a short example program that we can compile and test which displays this behavior?
(also, put code inside [ignore]

[/ignore] tags)

 

[newbieKing]

I declare the variables globally in a .h file:

/* files and directories */
const char * output_dir;
const char * perfusion_file;

My “file_name” is actually called “perfusion_file”. In my main program I have:

int main(int argc, char** argv)
{
assign_vars(argc, argv); // assigns variables here

cout << "Perfusion Out1: " << perfusion_file << "\n";

mkdir(output_dir);
cout << "Perfusion Out2: " << perfusion_file << "\n";

chdir(output_dir);
cout << "Perfusion Out3: " << perfusion_file << "\n";

…
}

In the output I get:

Perfusion Out1: F:\source\thermal\simmulti\const15.perf
Perfusion Out2:
Perfusion Out3: Ãyøwà>

I’m using VC++ on Windows 2000.

Do you have any idea what is wrong?

Thank you.

 

[cpjust]

If you print output_dir before and after mkdir(), what does it say?

 

[newbieKing]

Hello,

The output file string does not seem to change:

Output file before: F:\code\practice_code\Input_GUI_dynamic\output
Output file after: F:\code\practice_code\Input_GUI_dynamic\output

Any ideas?

Thanks!

 

[PerFnurt]

So what is the problem?

/Per
[sub]
www.perfnurt.se[/sub]

 

[newbieKing]

Hi,

It seems like I have a pointer problem...

Here is my code:
I declare a global char pointer in a .h file:
char * output_dir;

then in the main I print that dir:
cout << output_dir << end;
cout << &output_dir << end;
cout << output_dir << end;

The output is:
F:\source\thermal\simmulti\p3d_015.bnd
0042A900
F:\source\therma

Is my use of pointers totally wrong??

 

[xwb]

More like a stack problem. What does assign_vars do?