Shulou(Shulou.com)05/31 Report--

This article mainly explains "how C++ traverses the files under the directory", interested friends may wish to have a look. The method introduced in this paper is simple, fast and practical. Next, let the editor take you to learn how C++ traverses the files under the directory.

C++ traverses the files in the directory

Function: traverses all the files in the directory and returns the total number of files and subfolders (you can get all the file names by modifying them, etc.).

Example code:

# include "stdlib.h" # include "direct.h" # include "string.h" # include "io.h" # include "stdio.h" # include "iostream" using namespace std; class CBrowseDir {protected: / / the absolute path where the initial directory is stored, ending with'\ 'char mszInitDir [_ MAX_PATH]; public: / / default constructor CBrowseDir () / / set the initial directory to dir. If false is returned, it means that bool SetInitDir (const char * dir) is not available in the directory; / / start traversing files of the type specified by filespec in the initial directory and its subdirectories / / filespec can use the wildcard *? and cannot contain paths. / / if false is returned, the traversal process is aborted by the user bool BeginBrowse (const char * filespec); protected: / / traverses the files specified by filespec under the directory dir / / for subdirectories, iterative method / / if false is returned, the traversal file bool BrowseDir (const char * dir,const char * filespec) is aborted / / every time the function BrowseDir finds a file, it calls ProcessFile / / and passes the file name as an argument / / if false is returned, it means to abort traversing the file / / users can override the function and add their own processing code virtual bool ProcessFile (const char * filename) / / every time the function BrowseDir enters a directory, it calls ProcessDir / / and passes the name of the directory being processed and the name of the directory at the next level as parameters / / if you are processing the initial directory, parentdir=NULL / / users can overwrite the function and add their own processing code / / for example, the user can count the number of subdirectories here virtual void ProcessDir (const char * currentdir,const char * parentdir);} CBrowseDir::CBrowseDir () {/ / initializes m_szInitDir getcwd with the current directory; / / if the last letter of the directory is not'\', add a'\ 'int len=strlen (m_szInitDir) at the end; if (mszInitDir [len-1]! ='\\') strcat (m_szInitDir, "\\") } bool CBrowseDir::SetInitDir (const char * dir) {/ / first convert dir to the absolute path if (_ fullpath (massiszInitDirDirdagenology max path) = = NULL) return false; / / determine whether the directory exists if (_ chdir (m_szInitDir)! = 0) return false; / / if the last letter of the directory is not'\', add a'\ 'int len=strlen (m_szInitDir) at the end If (mszInitDir [len-1]! ='\\') strcat (m_szInitDir, "\"); return true;} bool CBrowseDir::BeginBrowse (const char * filespec) {ProcessDir (mleavszInitDirNull); return BrowseDir (mleavszInitDirNull);} bool CBrowseDir::BrowseDir (const char * dir,const char * filespec) {_ chdir (dir); / / first find the file long hFile in dir that meets the requirements _ finddata_t fileinfo; if ((hFile=_findfirst (filespec,&fileinfo))! =-1) {do {/ / check if it is not a directory / / if not, process if (! (fileinfo.attrib & _ A_SUBDIR)) {char filename [_ MAX_PATH]; strcpy (filename,dir); strcat (filename,fileinfo.name); cout

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