Win32 Watch directory for changes recursively

watch.cpp

#include <windows.h>
#include <stdio.h>

#define logf(fmt,...) do { fprintf(stderr, fmt "\n", ##__VA_ARGS__); fflush(stderr); } while (0)

void MonitorDirectoryRecursively(const char* directoryPath) {
    HANDLE hChange = FindFirstChangeNotification(
        directoryPath,
        TRUE, // Watch the subtree
        FILE_NOTIFY_CHANGE_LAST_WRITE | FILE_NOTIFY_CHANGE_FILE_NAME | FILE_NOTIFY_CHANGE_DIR_NAME
    );

    if (hChange == INVALID_HANDLE_VALUE) {
        logf("Error: FindFirstChangeNotification failed (%d)", GetLastError());
        return;
    }

    logf("Monitoring directory: %s", directoryPath);
    while (TRUE) {
        logf("waiting for change...");
        DWORD waitResult = WaitForSingleObject(hChange, INFINITE);

        if (waitResult == WAIT_OBJECT_0) {
            logf("Change detected in directory: %s", directoryPath);

            // Process changes here

            // Continue monitoring
            if (FindNextChangeNotification(hChange) == FALSE) {
                logf("Error: FindNextChangeNotification failed (%d)", GetLastError());
                break;
            }
        } else {
            logf("Error: WaitForSingleObject failed (%d)", GetLastError());
            break;
        }
    }

    FindCloseChangeNotification(hChange);
}

int main(int argc, char* argv[]) {
    logf("here!");
    if (argc != 2) {
        printf("Usage: %s <directory>\n", argv[0]);
        return 1;
    }
    MonitorDirectoryRecursively(argv[1]);
    return 0;
}