Problem:
I'm trying to hook up the standard input/standard output from a unix executable file to the user interface in a MacOS application. But, I can't seem to access the values - nothing shows up.
Background:
I've implemented every solution that I could find, but none of them have worked [1][2][3][4][5][6][7][8][9]. I've completed a Python 3 course [1], so that I could customize the standard output in the python script of the executable file [1]. And, I've reviewed and implemented several working MacOS repositories that update their user interface with data from standard output [1][2][3].
Code: Full
func runExecutable() {
let desktop = fileManager.urls(for: .desktopDirectory, in: .userDomainMask)[0]
let url = Bundle.main.url(forResource: "youtube_dl_custom", withExtension: "")
let arguments = [
"--format",
"bestvideo[ext=mp4]+bestaudio[ext=m4a]",
"--output",
"\(desktop)/%(title)s.%(ext)s",
"\(videoUrlTextField.stringValue)"
]
process.arguments = arguments
process.executableURL = url
process.standardInput = inputPipe
process.standardOutput = outputPipe
openConsolePipe()
inputPipe.fileHandleForReading.readabilityHandler = {
[weak self] fileHandle in
let data = fileHandle.availableData
self?.buffer.append(data)
if let buffer = self?.buffer,
let string = String(data: buffer, encoding: .utf8),
string.last?.isNewline == true {
self?.buffer.removeAll()
print("## \(string)")
self?.standardOutputTextView.string += string + "\n"
self?.outputPipe.fileHandleForWriting.write(data)
}
}
try? process.run()
closeConsolePipe()
}
func openConsolePipe() {
dup2(STDOUT_FILENO, outputPipe.fileHandleForWriting.fileDescriptor)
dup2(inputPipe.fileHandleForWriting.fileDescriptor, STDOUT_FILENO)
dup2(inputPipe.fileHandleForWriting.fileDescriptor, STDERR_FILENO)
}
func closeConsolePipe() {
freopen("/dev/stdout", "a", stdout)
}
Results:
The standard output appears to automatically print to the console, but I can't seem to access the values.
Misc:
Used the youtube-dlrepository to download videos [1].
Used a custom python script for youtube-dl [1].
Converted youtube-dl to an executable file using pyinstaller [1].
Posted the project to GitHub for troubleshooting [1].
