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how do you list all the txt files from a folder using c++ in a very SIMPLE manner

Posted on 2011-03-13
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Last Modified: 2012-05-11
Hi, what function and header do you have to use to list all the txt files from a folder.

could you also give a very simple SAMPLE code?

The code should not be more 25 lines.

Thanks again.
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Question by:pgmerLA
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sarabande earned 2000 total points
ID: 35123539
I thank all for this wise solution:

below is the 'simple code' commented.

Sara


#include <iostream>
#include <windows.h>

int main () 
{
   // defines the stucture for find file at WINAPI
   WIN32_FIND_DATA fd;

   // the first call may fail and return INVALID_HANDLE_VALUE
   // what is -1 casted to a HANDLE
   HANDLE hFind = FindFirstFile("c:\\path\\*.txt"),&fd);
   // in this case GetLastError will give a specific error 
   // check winerror.h for further analysis
   // error 2 means file not found
   // error 3 means folder not found
   // error 5 means access denied
   if (hFind == INVALID_HANDLE_VALUE)
      return GetLastError();

   do 
   {
      // you can collect the filenames here in the loop 
      // directories would have the directory flag as attribute 
      if ((fd.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY) == 0)
         std::cout << "File: " << fd.cFileName << std::endl;
   } 
   while (FindNextFile(hFind, &fd) != NULL);
   // the loop should end with 'no more files'
   if (GetLastError() != ERROR_NO_MORE_FILES)
      return GetLastError();
   FindClose(hFind);
   return 0;
}

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