Create a directory if it doesn t exist

Question

In my app I want to copy a file to the other hard disk so this is my code     include  lt windows h gt   using namespace std   int main int argc  char  argv           string Input    C   Emploi NAm docx       string CopiedFile    Emploi NAm docx       string OutputFolder    D   test       CopyFile Input c str    string OutputFolder CopiedFile  c str    TRUE        return 0      so after executing this  it shows me in the D HDD a file testEmploi NAm docx but I want him to create the test folder if it doesn t exist   I want to do that without using the Boost library

User · Answer

You can use cstdlib  Although- http   www cplusplus com articles j3wTURfi     include  lt cstdlib gt   const int dir  system  mkdir -p foo    if  dir lt  0         return      you can also check if the directory exists already by using    include  lt dirent h gt

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include  lt experimental filesystem gt     or  include  lt filesystem gt  for C  17 and up      namespace fs   std  experimental  filesystem    if   fs  is directory  quot src quot       fs  exists  quot src quot         Check if src folder exists     fs  create directory  quot src quot       create src folder

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Probably the easiest and most efficient way is to use boost and the boost  filesystem functions  This way you can build a directory simply and ensure that it is platform independent   const char  path    filePath c str    boost  filesystem  path dir path   if boost  filesystem  create directory dir         std  cerr lt  lt   Directory Created    lt  lt  filePath lt  lt std  endl      boost  filesystem  create directory - documentation

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Use the WINAPI CreateDirectory   function to create a folder   You can use this function without checking if the directory already exists as it will fail but GetLastError   will return ERROR ALREADY EXISTS   if  CreateDirectory OutputFolder c str    NULL         ERROR ALREADY EXISTS    GetLastError             CopyFile        else           Failed to create directory      The code for constructing the target file is incorrect   string OutputFolder CopiedFile  c str     this would produce  D  testEmploi Nam docx   there is a missing path separator between the directory and the filename  Example fix   string OutputFolder      CopiedFile  c str

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Here is the simple way to create a folder          include  lt windows h gt   include  lt stdio h gt   void CreateFolder const char   path           if  CreateDirectory path  NULL                 return            CreateFolder  C   folder name       This above code works well for me

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mkdir will also do the job    mkdir  D   test      https   msdn microsoft com en-us library 2fkk4dzw aspx

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Use CreateDirectory  char  DirName  SECURITY ATTRIBUTES Attribs    If the function succeeds it returns non-zero otherwise NULL

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OpenCV Specific  Opencv supports filesystem  probably through its dependency Boost    include  lt opencv2 core utils filesystem hpp gt  cv  utils  fs  createDirectory outputDir

[c++] Create a directory if it doesn't exist

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