To create all needed folders with fopen

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I'm using fopen("aaa\bbb\ccc\myfile.txt","w") to create output file. But folders aaa, bbb and ccc does't exists. What is the best way to solve this problem? Is there are any standard way to ask fopen to create all needed folders?

As others have noted, there is no cross-platform support for directories in the C standard library.

As far as my understanding goes, fopen() and friends don't even know or care that the /-es or \-es in the path you give them are used as directory separators in the two major operating system families in use today.

For a cross-platform solution for single directory creation, see @dbush 's answer.

You can then wrap this with a function of your own that will take the complete file/directory path including all parent folders and create all the required parent folders (if needed), one-by-one.

For this, you will need to devise a way of extracting out each successive parent directory from your file path, starting from the top-most/left-most directory. Take care with splitting strings in C, as functions like strtok() can be unsafe —you might be better off with a different approach for converting the path into a list of directories to create.

You may also need to handle cases where directories already exist, or where a file exists at a path where you wanted to place one of your directories.

How to create folder at fopen? - C / C++, specified folder is not available, the file isn't created at all. Is there Be careful with the backspaces, you may need more than you show here;-) The C library function FILE *fopen(const char *filename, const char *mode) opens the filename pointed to, by filename using the given mode. Following is the declaration for fopen() function. This function returns a FILE pointer. Otherwise, NULL is returned and the global variable errno is set to

If you can mix some C++ in your program, boost.filesystem library has a very handy function to create all intermediate directories.

bool create_directories(const path& p);

Creating a folder if it doesn't exists in C, with fopen? How? [Archive , So how to do this? fopen doesn't do it automatically, it just returns NULL if folder about a file or directory, and the mkdir library function to create a directory. Add more flags to the mode if necessary. Powered by vBulletin® Version 4.2.2 Copyright © 2020 vBulletin Solutions, Inc. All rights reserved. # specified folder is not available, the file isn't created at all. Whether stdio can do anything with directories except handle file paths to files with directory name, this is system dependent. In general you have to handle directories by constructing commands to pass to system() or with implementation dependent calls.--

The C Std. Lib. functions for opening and writing-to files, while they can create new files in existing directories, they cannot create new directories. To do that, I suggest using the "mkdir" function from header "sys/stat.h" and the "chdir" function from header "unistd.h".

For example, if writing a C program to be used on Cygwin on Windows 10, something like this would work:

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/stat.h>
#include <errno.h>
#include <error.h>
int main (void)
{
   FILE * fp;
   chdir("/cygdrive/d");
   if (mkdir("aaa", S_IRWXU|S_IRWXG|S_IROTH))
   {
      error(EXIT_FAILURE, errno, "Failed to create directory aaa");
   }
   chdir("aaa");
   if (mkdir("bbb", S_IRWXU|S_IRWXG|S_IROTH))
   {
      error(EXIT_FAILURE, errno, "Failed to create directory bbb");
   }
   chdir("bbb");
   if (mkdir("ccc", S_IRWXU|S_IRWXG|S_IROTH))
   {
      error(EXIT_FAILURE, errno, "Failed to create directory ccc");
   }
   chdir("ccc");
   fp=fopen("MyFile.txt", "w");
   if (!fp)
   {
      error(EXIT_FAILURE, errno, "Failed to open file for writing");
   }
   fprintf(fp, "Test.\n");
   fclose(fp);
   return 0;
}

That will create the directory "D:\aaa\bbb\ccc", then create a file in that directory called "MyFile.txt", then write "Test.\n" to that file.

Creating a file, when the parent directories might not exist, Is there a function i can call in win32 that will create the directories for me if they dont exist? Create the file // return fopen(strPathAndFile.c_str(),"wb");} ext); // SHCreateDirectoryEx creates all intermediate directories string path file's parent directory doesn't exist, // then we need to do a little more work. We can read the files when placed in the sub folders using BFILE, but we need to create an html upload system instead of FTP accounts. So basically, is their a way to make the following work: Currently when we append a folder name to the file, it just ignores it and places it in the root of the Oracle Directory.

Probably not as elegant as other ones but:

system("mkdir aaa\\bbb\\ccc\\");
FILE * fp;
fp = fopen("aaa/bbb/ccc/myfile.txt","w");

For linux use -p option and slashes.

EDIT: backslashes should be in system() function if you're using Windows

fopen: is there a way to create directories with this as well, and not , fopen: is there a way to create directories with this as well, and not just files? Question I don't understand how C makes a new file at all. Thank you! Edit: The​  It needed to create a file in data\global. This failed until I created the global folder manually. 2. I have Apache+MySQL+PHP running on my system. PHP was unable to create the folder 'session' in my AppData\Local\Temp\php folder. Again, if I created the session folder manually, PHP was then able to create session files in that folder.

if you are using fopen() then you should create the parent directories first.

you can simply do this by

system("mkdir -p aaa/bbb/ccc");
fopen("aaa/bbb/ccc/myfile.txt","w");

don't forget to include header file <stdlib.h> in this program

Add directory path to fopen - MATLAB Answers, Let me explain again what I really need. This function creates the text file in the current work folder, let's say /Work/name_date.txt. I need it to create the text file in​  If PHP has decided that filename specifies a registered protocol, and that protocol is registered as a network URL, PHP will check to make sure that allow_url_fopen is enabled. If it is switched off, PHP will emit a warning and the fopen call will fail.

fopen - Manual, The file must be accessible to PHP, so you need to ensure that the file access '​x+', Create and open for reading and writing; otherwise it has the same You should use the 'b' in all other cases. If you are unsure whether filename is a file or a directory, you may need to use the is_dir() function before calling fopen(). Folder creation status indicating whether the attempt to create the folder is successful, returned as 0 or 1. If the attempt to create the folder is successful or the folder already exists, then the value of status is 1. Otherwise, the value is 0.

Create, and Delete Files and Directories | PHP File Handling, When Creating files and folders in PHP you should first make sure that your web In PHP, writing new files is done using a combination of the fopen, fwrite, and The function names are a little misleading, as they indicate that a file needs to will create the directory with 777 permissions, which gives full access to all users​  fopen() is used to open input streams for text or binary files and not the directory files. If you want to have your file open in a path which holds non-existant directories, I'd suggest you use the mkdir() method of the /sys/stat.h header file.

Ask TOM "FOPEN to sub folders", Developers and DBAs get help from Oracle experts on: FOPEN to sub folders. in the sub folders using BFILE, but we need to create an html upload access to the all folders underneath it, and that could be catastrophic. That is a reason to make fopen() set errno, but I posit that, in the case of fopen(), it is not as likely a scenario as in the case of, e.g., a string of floating point

Comments
  • No, fopen will never make directories. There's a question with good answers already about an extended mkdir() that makes multiple levels, which is similar to what you want. You'd need to do that multi-level mkdir on "aaa/bbb/ccc/" then call fopen.
  • For windows you could use information in this post stackoverflow.com/questions/2834737/…
  • Remember to double those backslashes, in general that is. Won't help with the problem since fopen() simply doesn't support creating directories, but if the dirs existed it would be necessary.
  • @WumpusQ.Wumbley Why not answer instead of make a comment? So the author would be able to close this question.
  • Folders are a GUI artefact. What the file system deals with is directories and they are operating system specific. Standard C11 does not know about directories
  • @andreee True, but the folder path looks as from Windows.
  • The backslashes should be escaped, and could be replaced by slashes.
  • Forgot about that, thanks. If the user uses Windows, then terminal will return syntax error (and not creating the directory) if using slashes
  • The backslashes should be escaped, and could be replaced by slashes. The mkdir command might not exist or not know about -p
  • Don't use that code, the strcat() call is evil: It definitely overruns the buffer holding the environment variables content. This undefined behavior will likely trash some other environment variable(s), or worse.