Thread: Finding files in a directory

  1. #1
    Registered User
    Join Date
    Nov 2006

    Finding files in a directory

    I'm trying to write code that searches through a folder and retrieves the names of the files in the folder.

    So far I have the following code. When I run it, I just keep getting the Usage portion of the code. Why does argc need to be equal to 2 for the code to not print the usage portion. Also, where in the code would I specify the name of the directory I want to search?

    #define _WIN32_WINNT 0x0501
    #include <windows.h>
    #include <tchar.h> 
    #include <stdio.h>
    #include <strsafe.h>
    #include <conio.h>
    int _tmain(int argc, TCHAR *argv[])
       WIN32_FIND_DATA ffd;
       TCHAR szDir[MAX_PATH];
       size_t length_of_arg;
       DWORD dwError=0;
       // If the directory is not specified as a command-line argument,
       // print usage.
       if(argc != 2)
           _tprintf(TEXT("Usage: %s <dir>\n"), argv[0]);
          return (-1);
       // Check that the input path plus 2 is not longer than MAX_PATH.
       StringCchLength(argv[1], MAX_PATH, &length_of_arg);
       if (length_of_arg > (MAX_PATH - 2))
          _tprintf(TEXT("Directory path is too long.\n"));
          return (-1);
    	_tprintf (TEXT("Target directory is %s\n\n"), argv[1]);
       // Prepare string for use with FindFile functions.  First, copy the
       // string to a buffer, then append '\*' to the directory name.
       StringCchCopy (szDir, MAX_PATH, argv[1]);
       StringCchCat (szDir, MAX_PATH, TEXT("\\*"));
       // Find the first file in the directory.
       hFind = FindFirstFile(szDir, &ffd);
       if (INVALID_HANDLE_VALUE == hFind) 
          dwError = GetLastError();
          _tprintf (TEXT("FindFirstFile failed (%u)\n"), dwError);
          return dwError;
          _tprintf (TEXT("First file: %s\n"), ffd.cFileName);
          // List all the other files in the directory.
          while (FindNextFile(hFind, &ffd) != 0) 
             _tprintf (TEXT(" Next file: %s\n"), ffd.cFileName);
          dwError = GetLastError();
          if (dwError != ERROR_NO_MORE_FILES) 
             _tprintf (TEXT("FindNextFile error (%u)\n"), dwError);
             goto Cleanup;
       return dwError;

  2. #2
    Kernel hacker
    Join Date
    Jul 2007
    Farncombe, Surrey, England
    The first argument of the command-line is the directory specification. You can specify that with "myprog somedir" if you use a command prompt to run your code, or if you use visual studio or similar, you need to set the command line argument somewhere in the project config settings - I find it much easier to use the command prompt, in 99% of the case.

    Compilers can produce warnings - make the compiler programmers happy: Use them!
    Please don't PM me for help - and no, I don't do help over instant messengers.

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