Getting a directory name from a filename

Question

I have a filename  C  folder foo txt  and I need to retrieve the folder name  C  folder  in unmanaged C    In C  I would do something like this   string folder   new FileInfo  C  folder foo txt   DirectoryName    Is there a function that can be used in unmanaged C   to extract the path from the filename

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Why does it have to be so complicated    include  lt windows h gt   int main int argc  char   argv             argv 0    C  dev test exe       char  p   strrchr argv 0              if p  p 0    0       printf argv 0                          argv 0    C  dev

User · Answer

splitpath is a nice CRT solution

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Example from http   www cplusplus com reference string string find last of      string  find last of  include  lt iostream gt   include  lt string gt  using namespace std   void SplitFilename  const string amp  str      size t found    cout  lt  lt   Splitting     lt  lt  str  lt  lt  endl    found str find last of           cout  lt  lt    folder     lt  lt  str substr 0 found   lt  lt  endl    cout  lt  lt    file     lt  lt  str substr found 1   lt  lt  endl     int main        string str1    usr bin man      string str2   c   windows  winhelp exe       SplitFilename  str1     SplitFilename  str2      return 0

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There is a standard Windows function for this  PathRemoveFileSpec  If you only support Windows 8 and later  it is highly recommended to use PathCchRemoveFileSpec instead  Among other improvements  it is no longer limited to MAX PATH  260  characters

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auto p   boost  filesystem  path  test folder file txt     std  cout  lt  lt  p parent path    lt  lt    n                  test folder  std  cout  lt  lt  p parent path   filename    lt  lt    n       folder  std  cout  lt  lt  p filename    lt  lt    n                     file txt   You may need p parent path   filename   to get name of parent folder

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Just use this  ExtractFilePath your path file name

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In C  17 there exists a class std  filesystem  path using the method parent path    include  lt iostream gt   include  lt filesystem gt  namespace fs   std  filesystem  int main         for fs  path p      var tmp example txt          var tmp              std  cout  lt  lt   The parent path of    lt  lt  p                    lt  lt    is    lt  lt  p parent path    lt  lt    n       Possible output   The parent path of   var tmp example txt  is   var tmp  The parent path of     is    The parent path of   var tmp    is   var tmp

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Using Boost Filesystem   boost  filesystem  path p  C   folder  foo txt    boost  filesystem  path dir   p parent path

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I m so surprised no one has mentioned the standard way in Posix  Please use basename   dirname constructs   man basename

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Standard C   won t do much for you in this regard  since path names are platform-specific  You can manually parse the string  as in glowcoder s answer   use operating system facilities  e g  http   msdn microsoft com en-us library aa364232 v VS 85  aspx    or probably the best approach  you can use a third-party filesystem library like boost  filesystem

User · Answer

Use boost  filesystem   It will be incorporated into the next standard anyway so you may as well get used to it

[c++] Getting a directory name from a filename

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