import SwiftUI

/*

?project navigator / Targets / Signing & Capabilities / App Sandbox:

? User Selected File: Read/Write;

? Downloads Folder: Read/Write;

?*/

struct ContentView: View {

? @State private var fileDialogShown: Bool = false

? var body: some View {

? ? HStack {

? ? ? Button("Button1") { fileDialogShown = true }

? ? ? ? .fileImporter(isPresented: $fileDialogShown,

? ? ? ? ? ? ? ? allowedContentTypes: [.plainText])

? ? ? ? { result in

? ? ? ? ? guard let file = try? result.get() else { return }

? ? ? ? ? //Sandbox: User Selected File

? ? ? ? ? hello(file: file.path)

? ? ? ? }

? ? ? Button("Button2") { hello2() }

? ? }.frame(minWidth: 300, minHeight: 300)

? }

??

? func hello2(){

? ? //Sandbox: Downloads Folder, ~/Downloads

? ? let dir = FileManager.default.urls(for: .downloadsDirectory,

? ? ? ? ? ? ? ? ? ? ? ?in: .userDomainMask).first!

? ? let file = dir.appendingPathComponent("hello.txt")

? ? hello(file: file.path)

? }

??

? func hello(file: String){

? ? var fp = fopen(file, "a")

? ? if fp == nil {

? ? ? perror("fopen")

? ? ? return;

? ? }

? ? fputs("hello1\n", fp)

? ? fputs("hello2\n", fp)

? ? fclose(fp)

? ? fp = fopen(file, "r")

? ? var buffer = [CChar](repeating: 0, count: 128)

? ? while fgets(&buffer, Int32(buffer.count), fp) != nil {

? ? ? print(String(cString: buffer), terminator: "")

? ? }

? ? fclose(fp);

? }

}