[英]Send POST request in Swift from JSON data sent over WebSocket
[英]Send File Over HTTP Post Request in Swift
我对 Swift 真的很陌生,并试图从 iOS 将一些文件上传到树莓派。 我发现 HTTP 发布请求,但我也不太了解。 我实际上是一个嵌入式 linux 程序员。 所以,我像这样发布我的请求
var data = Data()
data.append("\r\n--\(boundary)\r\n".data(using: .utf8)!)
data.append("Content-Disposition: form-data; name=\"\(paramName)\"; filename=\"\(fileName)\"\r\n".data(using: .utf8)!)
data.append("Content-Type: \"content-type header\"\r\n\r\n".data(using: .utf8)!)
data.append(read().data(using: .utf8)!)
data.append("\r\n--\(boundary)--\r\n".data(using: .utf8)!)
显然,如果文件是 txt,我工作得很好,而且我无论如何都找不到读取并将我的原始数据放入这种数据格式。 有什么帮助吗?
读取()->字符串
我无法解释我做了什么,但我试图写清楚
func getFile(fileName: String) -> [UInt8]? {
// See if the file exists.
if let dir = FileManager.default.urls(for: .documentDirectory, in: .userDomainMask).first {
let fileURL = dir.appendingPathComponent(fileName)
do {
// Get the raw data from the file.
let rawData: Data = try Data(contentsOf: fileURL)
// Return the raw data as an array of bytes.
return [UInt8](rawData)
} catch {
// Couldn't read the file.
return nil
}
}
print("\(fileName) not exist")
return nil
}
func uploadFile(fileName: String, fileExtension: String, endpoint: String) {
let fileNameWithExtension = fileName + "." + fileExtension
let url = URL(string: endpoint)
var data = Data()
// generate boundary string using a unique per-app string
let boundary = UUID().uuidString
let session = URLSession.shared
// Set the URLRequest to POST and to the specified URL
var urlRequest = URLRequest(url: url!)
urlRequest.httpMethod = "POST"
// Set Content-Type Header to multipart/form-data, this is equivalent to submitting form data with file upload in a web browser
// And the boundary is also set here
urlRequest.setValue("multipart/form-data; boundary=\(boundary)", forHTTPHeaderField: "Content-Type")
// Add the file data to the raw http request data
// data.append("\r\n--\(boundary)--\r\n".data(using: .utf8)!)
// data.append("Content-Disposition: form-data; name=\"name\"; username=\"kemal\"\r\n".data(using: .utf8)!)
data.append("\r\n--\(boundary)\r\n".data(using: .utf8)!)
data.append("Content-Disposition: form-data; name=\"file\"; filename=\"recieved\(fileExtension)\"\r\n".data(using: .utf8)!)
data.append("Content-Type: \"content-type header\"\r\n\r\n".data(using: .utf8)!)
print("opening file...")
if let bytes: [UInt8] = getFile(fileName: fileNameWithExtension) {
for byte in bytes {
data.append(byte)
}
data.append("\r\n--\(boundary)\r\n".data(using: .utf8)!)
// Send a POST request to the URL, with the data we created earlier
session.uploadTask(with: urlRequest, from: data, completionHandler: { responseData, response, error in
if error == nil {
let jsonData = try? JSONSerialization.jsonObject(with: responseData!, options: .allowFragments)
if let json = jsonData as? [String: Any] {
print(json)
}
}
}).resume()
}
}
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