C + + reads all files in a home or a file with a specific suffix

Since there are often many random numbered files that are read in a folder, many times it is necessary to read all the files in certain formats.

The following code can read all files and folders in the specified file home in JPG-formatted files

Reference: http://www.2cto.com/kf/201407/316515.html

#include <io.h>

#include <fstream>

#include <string>

#include <vector>

using namespace Std;

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Get all the file names

void Getallfiles (string path, vector<string>& files)

{

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???? Long hfile = 0;

???? File information

???? struct _finddata_t FileInfo;

???? string P;

???? if (hfile = _findfirst (p.assign (Path). Append ("\\*"). C_str (), &fileinfo))!! =-1)

???? {

???????? Do

???????? {

???????????? if ((Fileinfo.attrib & _a_subdir))

???????????? {

???????????????? if (strcmp (Fileinfo.name, ".")! = 0 && strcmp (fileinfo.name, "...")! = 0)

???????????????? {

???????????????????? Files.push_back (p.assign (Path). append ("\ \"). Append (Fileinfo.name));

???????????????????? Getallfiles (p.assign (Path). append ("\ \"). Append (Fileinfo.name), files);

????????????????}

????????????}

???????????? Else

???????????? {

???????????????? Files.push_back (p.assign (Path). append ("\ \"). Append (Fileinfo.name));

????????????}

?

????????} while (_findnext (hfile, &fileinfo) = = 0);

?

???????? _findclose (hfile);

????}

?

}

?

Get file names in a specific format

void Getallformatfiles (string path, vector<string>& files,string format)

{

???? File handle

???? Long hfile = 0;

???? File information

???? struct _finddata_t FileInfo;

???? string P;

???? if (hfile = _findfirst (p.assign (Path). Append ("\\*" + format). C_STR (), &fileinfo))! =-1)

???? {

???????? Do

???????? {

???????????? if ((Fileinfo.attrib & _a_subdir))

???????????? {

???????????????? if (strcmp (Fileinfo.name, ".")! = 0 && strcmp (fileinfo.name, "...")! = 0)

???????????????? {

???????????????????? Files.push_back (p.assign (Path). append ("\ \"). Append (Fileinfo.name));

???????????????????? Getallformatfiles (p.assign (Path). append ("\ \"). Append (Fileinfo.name), Files,format);

????????????????}

????????????}

???????????? Else

???????????? {

???????????????? Files.push_back (p.assign (Path). append ("\ \"). Append (Fileinfo.name));

????????????}

????????} while (_findnext (hfile, &fileinfo) = = 0);

?

???????? _findclose (hfile);

????}

}

?

The function has two parameters, the first is a path string (string type, preferably an absolute path);

The second parameter is a folder with a file name that stores variables (vector type, reference pass).

Call the format in the main function (and save the result in the file "AllFiles.txt", the total number of first actions):

?

int main ()

{

???? String FilePath = "Testimages\\water";

???? vector<string> files;

???? char * distall = "AllFiles.txt";

?

???? Read all files, including sub-files

???? Getallfiles (FilePath, files);

?

???? Read all files in JPG format

???? string format = ". jpg";

???? Getallformatfiles (FilePath, Files,format);

???? Ofstream ofn (Distall);

???? int size = Files.size ();

???? ofn<<size<<endl;

???? for (int i = 0;i<size;i++)

???? {

???????? ofn<<files[i]<<endl;

???????? cout<< Files[i] << Endl;

????}

???? Ofn.close ();

???? return 0;

}

C + + reads all files in a home or a file with a specific suffix