need list of files in directory

[hugh7]

I need to get a list of text files on a: drive . How can I do this?
I will then load the file names into an array in order to open each file and then append to another text file.
Thanks for any ideas.

 

[ArkM]

Scan directory pattern is:

#include <windows.h>
...
const char p[] = &quot;A:\\*.txt&quot;;
...
WIN32_FIND_DATA info;
HANDLE h;

if ((h = FindFirstFile(p,&info)) != INVALID_HANDLE_VALUE)
{
  do
  {
    // Now file name C-string is in info.cFileName array
    ...
  } while(FindNextFile(h,&info));
  FindClose(h);
}
else ... // No such files.

To scan all drive (with subdirectories) you may modify and convert this snippet into the (recursive) function, for example:

class DirList {...}; // Invent file names collector.
...
int ScanDir(const char* dir, DirList& dl)
{
  int n = 0; // Number of files scanned.
  char* pattern = new char[_MAX_PATH];
  // todo: Make dir\*.* pattern to scan ALL files and dirs
  WIN32_FIND_DATA info;
  HANDLE h;
  if ((h = ... // see above
  {
    do
    {
       if (info.dwFileAttributes&FILE_ATTRIBUTE_DIRECTORY)
       {
         // Make dir\info.cFileName in p (subdir name)
         n += ScanDir(p,dl);
       }
       else if (it's a TEXT file - check info.cFileName)
       {
          ++n;
          dl.add(info.cFileName);
       }
    while (... see above);
    ... CloseHandle etc - see above
  }
  delete [] pattern;
  return n;
}

Windows directory scanning can't filter files by attributes. You must do it in your code.
Directory scanning is a platform-dependent issue. Therefore no dirscan functionality in C++ standard library.

 

[hugh7]

Thanks for the code sample. I will give it a try and check out the windows.h header. I take it that FindFirstFile() is part of the windows.h header?

Hugh

 

[Cagliostro]

is a part of WinAPI and the prototype is declared in winuser.h. To use it you should include windows.h

Ion Filipski

 

[hugh7]

Hi Ion,
Thanks for the reply. I can see that as I learn C++ I will need to learn more about the WinAPI. I suppose Mac's have their own API.

Hugh

 

[Cagliostro]

If you have Microsoft software on your MAC then you can use WinAPI

Ion Filipski

 

[hugh7]

That's good news

Hugh