Browse a whole folder in C - c

Question

I'm trying to list all the contents of a folder (including subfolder and its files)
Like ls -R with Linux
(I am using windows 10)
I already have this basic code with "dirent.h"
#include <stdio.h>
#include <dirent.h>
int main()
{
DIR *rep ;
struct dirent *file ;
rep = opendir ("c:\test") ;
if (rep != NULL)
{
while (file = readdir(rep))
printf ("%s\n", file->d_name) ;
(void) closedir (rep) ;
}
return 0;
}
It lists the contents of a folder well but does not browse the sub-folders
For example it could browse a whole hard drive
like C: /
I can't use d_type for detect if the content is a file or a folder
Because with windows the struct is:
struct dirent
{
long d_ino; /* Always zero. */
unsigned short d_reclen; /* Always zero. */
unsigned short d_namlen; /* Length of name in d_name. */
char d_name[260]; /* [FILENAME_MAX] */ /* File name. */
};
So I'm stuck on this problem, if anyone has an idea, or even a code
COMPILER: MinGW32 1.5.0

Answer 1

Here is an example of directory list for Windows.
I used Microsoft Visual Studio Community 2019 to build. It works as a Unicode Windows application. That is files and folders having name with non ASCII characters are handled correctly.
To achieve that, I used Windows typical data types and functions:
char -> WCHAR
strcpy -> wcscpy
strcat -> wcscat
strncmp -> wcsncmp
printf -> wprintf
Depending on the compiler you use, you may use the standard data types and functions.
String constant are prefixed with L to specify an Unicode string (16 bit characters).
The main function is ScanDir which take the starting directory and a file mask. Example of call:
ScanDir(L"C:\\Users\\fpiette\\Documents", L"*.jpg");
ScanDir will scan the specified folder for all files and then scan again for all directories, calling ScanDir recursively. For each file, the size and filename are displayed (Of course you may display other properties like time stamp and attributes). For each directory, the name is displayed.
Basically, iterating a directory is done using Windows FindFirstFile and FileNextFile.
Source code:
#include <stdio.h>
#include <stdlib.h>
#include <io.h>
#include <fcntl.h>
#include <Windows.h>
BOOL ScanDir(
WCHAR* srcDir,
WCHAR* fileMask)
{
WIN32_FIND_DATA fd;
HANDLE fh;
BOOL more;
WCHAR fromDir[MAX_PATH];
BOOL found;
_int64 fileSize;
wcscpy(fromDir, srcDir);
wcscat(fromDir, L"\\");
wcscat(fromDir, fileMask);
// First step: process files in current dir
fh = FindFirstFile(fromDir, &fd);
more = fh != INVALID_HANDLE_VALUE;
found = FALSE;
while (more) {
// Ignore directories in first step
if (0 == (fd.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY)) {
if (!found) {
// For the first file found, display the title
found = TRUE;
wprintf(L"\nDirectory %s\n\n", srcDir);
}
fileSize = ((_int64)fd.nFileSizeHigh << 32) + fd.nFileSizeLow;
// display file information
wprintf(L"%12lld %s\n", fileSize, fd.cFileName);
}
more = FindNextFile(fh, &fd);
}
FindClose(fh);
// Second step: recursively process subfolders
wcscpy(fromDir, srcDir);
wcscat(fromDir, L"\\*.*");
fh = FindFirstFile(fromDir, &fd);
more = fh != INVALID_HANDLE_VALUE;
while (more) {
// Ignore files in second step
if (0 != (fd.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY)) {
// We have a directory, process it recursively
if (wcsncmp(fd.cFileName, L".", 2) && // Ignore current directory "."
wcsncmp(fd.cFileName, L"..", 3)) { // Ignore parent directory ".."
wcscpy(fromDir, srcDir);
wcscat(fromDir, L"\\");
wcscat(fromDir, fd.cFileName);
if (!ScanDir(fromDir, fileMask))
return 0;
}
}
more = FindNextFile(fh, &fd);
}
FindClose(fh);
return TRUE;
}
int main()
{
// Change console output to unicode 16 bit (default is OEM)
_setmode(_fileno(stdout), _O_U16TEXT);
ScanDir(L"C:\\Users\\fpiette\\Documents", L"*.jpg");
return 0;
}