how can i search .txt files in a folder in C? - c

Question

I want to get file extensions without using standart libraries in C. so basically i want to search for .txt files in a folder which includes .png, .txt, .jpg files.
I don't have a certain code to show, although while I was searching I found a code which includes <dirent.h> and everybody was saying this code cannot be done without that library. Can't I do it without that? and also in some websites they were saying <dirent.h> is only a library for Linux. I'm using MacOS.
code was this: How can I get only txt files from directory in c?
error is this:
Member reference base type 'char [1024]' is not a structure or union.
Can you help me?

Answer 1

If it is supposed to work on macOS only, you can use macOS native frameworks instead of standard libraries, like this:
#include "CoreFoundation/CoreFoundation.h"
int main(int argc, const char * argv[]) {
CFStringRef extension = CFStringCreateWithCString(NULL, ".txt", CFStringGetSystemEncoding());
CFStringRef folderURLString = CFStringCreateWithCString(NULL, "file:///Users/mousetail/Downloads/", CFStringGetSystemEncoding());
CFURLRef folderURL = CFURLCreateWithString(NULL, folderURLString, NULL);
CFURLEnumeratorRef enumerator = CFURLEnumeratorCreateForDirectoryURL(NULL, folderURL, kCFURLEnumeratorDefaultBehavior, NULL);
while (true) {
CFURLRef fileURL = NULL;
CFURLEnumeratorResult enumeratorResult = CFURLEnumeratorGetNextURL(enumerator, &fileURL, NULL);
if (kCFURLEnumeratorSuccess == enumeratorResult) {
CFStringRef fileURLString = CFURLGetString(fileURL);
if (CFStringHasSuffix(fileURLString, extension)) {
CFShow(fileURLString);
}
} else if (kCFURLEnumeratorEnd == enumeratorResult) {
break;
}
}
CFRelease(enumerator);
CFRelease(folderURL);
CFRelease(folderURLString);
CFRelease(extension);
return 0;
}