Getting file/folder list in Windows and Linux

Getting file/folder list in Windows and Linux without using libraries is a tricky business. In Windows Visual Studio, there is also a character set setting (Project properties - Advanced - Character Set) which has to be taken into account.

	#ifdef _WIN32
	#include <windows.h> //NOTE: The first include must be windows.h
	#include <stdio.h>
	#include <tchar.h>
	#include <strsafe.h>
	#include<comdef.h> //to convert WCHAR to char*
	#pragma comment(lib, "User32.lib")
	namespace FileUtils { //NOTE: namespace must come after #include statements, otherwise you will get strange errors.
	//https://docs.microsoft.com/en-us/windows/win32/fileio/listing-the-files-in-a-directory
	int GetAll(DWORD fileAttribute, const char* folderName, char fileNames[][MAX_FILE_NAME_LENGTH]) {
	WIN32_FIND_DATA ffd;
	HANDLE hFind = INVALID_HANDLE_VALUE;
	DWORD dwError = 0;
	TCHAR szDir[MAX_FOLDER_NAME_LENGTH];
	#ifdef UNICODE //Project properties - Advanced - Character Set
	//convert const char* to LPCWSTR:
	int size = MultiByteToWideChar(CP_ACP, 0, folderName, -1, NULL, 0);
	TCHAR folderNameLPCWSTR[MAX_FOLDER_NAME_LENGTH];
	MultiByteToWideChar(CP_ACP, 0, folderName, -1, (WCHAR*)folderNameLPCWSTR, size);
	// Prepare string for use with FindFile functions. First, copy the string to a buffer, then append '\*' to the directory name.
	StringCchCopy(szDir, MAX_FOLDER_NAME_LENGTH, (STRSAFE_LPCWSTR)folderNameLPCWSTR);
	StringCchCat(szDir, MAX_FOLDER_NAME_LENGTH, TEXT("\\*"));
	#else //Multi-Byte
	sprintf(szDir, "%s\\*", folderName);
	#endif
	// Find the first file in the directory:
	//hFind = FindFirstFile(szDirLPCWSTR, &ffd);
	hFind = FindFirstFile(szDir, &ffd);
	if (INVALID_HANDLE_VALUE == hFind) {
	printf("Error: Folder (%s) does not exist!\n", folderName);
	return 0;
	}
	// List all the files in the directory with some info about them.
	size_t nFiles = 0;
	do {
	if (ffd.dwFileAttributes & fileAttribute) {
	//convert wchar to char*:
	_bstr_t b(ffd.cFileName);
	const char* fileName = b;
	strcpy(fileNames[nFiles], fileName);
	//filesize.LowPart = ffd.nFileSizeLow;
	//filesize.HighPart = ffd.nFileSizeHigh;
	//_tprintf(TEXT(" %s %ld bytes\n"), ffd.cFileName, filesize.QuadPart);
	nFiles++;
	if (nFiles > MAX_NB_OF_FILES) {
	printf("Error: nFiles (%d) > MAX_NB_OF_FILES (%d)!\n", nFiles, MAX_NB_OF_FILES);
	return 0;
	}
	}
	} while (FindNextFile(hFind, &ffd) != 0);
	dwError = GetLastError();
	if (dwError != ERROR_NO_MORE_FILES) {
	printf("Error: %d\n", dwError);
	return 0;
	}
	FindClose(hFind);
	//return dwError;
	return nFiles;
	}
	int GetAllFolders(const char* folderName, char fileNames[][MAX_FILE_NAME_LENGTH]) {
	return GetAll(FILE_ATTRIBUTE_DIRECTORY, folderName, fileNames);
	}
	#define FILE_ATTRIBUTE_FILE (8224)
	int GetAllFiles(const char* folderName, char fileNames[][MAX_FILE_NAME_LENGTH]) {
	return GetAll(FILE_ATTRIBUTE_FILE, folderName, fileNames);
	}
	#else //POSIX, Linux
	//https://stackoverflow.com/a/4204758/51358
	#include <stdio.h>
	#include <dirent.h>
	#include <string.h>
	#define FILE_ATTRIBUTE_DIRECTORY (4)
	#define FILE_ATTRIBUTE_FILE (8)
	namespace FileUtils {
	int GetAll(const char* folderName, unsigned char d_type, char fileNames[][MAX_FILE_NAME_LENGTH]) {
	DIR* d = opendir(folderName);
	int nFiles = 0;
	if (d) {
	struct dirent* dir;
	while ((dir = readdir(d)) != NULL) {
	if(d_type == dir->d_type) {
	//printf("name: %s, type: %d\n", dir->d_name, dir->d_type);
	strcpy(fileNames[nFiles], dir->d_name);
	nFiles++;
	}
	}
	closedir(d);
	}
	return nFiles;
	}
	int GetAllFolders(const char* folderName, char fileNames[][MAX_FILE_NAME_LENGTH]) {
	return GetAll(folderName, FILE_ATTRIBUTE_DIRECTORY, fileNames);
	}
	int GetAllFiles(const char* folderName, char fileNames[][MAX_FILE_NAME_LENGTH]) {
	return GetAll(folderName, FILE_ATTRIBUTE_FILE, fileNames);
	}
	#endif // _WIN32
	}

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