swift - 如何使用 POST 上传文件附件？

Question

我创建了一个音频文件，我想附加到 Salesforce 中的“订单”对象。该文件的路径正确位于 theSoundPath。

以下代码导致错误:'NSInvalidArgumentException'，原因:'JSON 写入 (NSConcreteData) 中的类型无效'

我正在按照 API 的要求使用 base64 对文件进行编码。但我也在想这就是抛出这个错误的原因。如果有人能指出我正确的方向，我将不胜感激。

这是相关代码(使用 SwiftyJSON 和 Alamofire):

    let encodedSound = NSFileManager.defaultManager().contentsAtPath(self.theSoundPath)
    let encodedBase64Sound = encodedSound!.base64EncodedDataWithOptions(nil)
    let tokenParam = "Bearer " + theToken // Bearer prefix required by API
    let theWriteURL = theInstance + "/services/data/v33.0/sobjects/Order/" + self.theOrder + "/Attachment/"
    let URL = NSURL(string: theWriteURL)!
    let mutableURLRequest = NSMutableURLRequest(URL: URL)
    mutableURLRequest.HTTPMethod = "POST"

    let parameters = [
        "AccountId": "001xxxxxxxxxxxx",
        "Name": "testfile.aac",
        "Body": encodedBase64Sound
    ]

    var JSONSerializationError: NSError? = nil
    mutableURLRequest.HTTPBody = NSJSONSerialization.dataWithJSONObject(parameters, options: nil, error: &JSONSerializationError)
    mutableURLRequest.setValue("application/json", forHTTPHeaderField: "Content-Type")
    mutableURLRequest.setValue(tokenParam, forHTTPHeaderField: "Authorization")

    Alamofire.request(mutableURLRequest)
        .responseJSON { (req, res, json, error) in // . . . etc.

Answer 1

来自 NSJSONSerialization's doc

An object that may be converted to JSON must have the following properties:

• The top level object is an NSArray or NSDictionary.

• All objects are instances of NSString, NSNumber, NSArray, NSDictionary, or NSNull.

• All dictionary keys are instances of NSString.

• Numbers are not NaN or infinity.

但是你尝试序列化一个NSData对象，

的结果

encodedBase64Sound = encodedSound!.base64EncodedDataWithOptions(nil)

而是创建一个 base64 字符串

encodedBase64Sound = encodedSound!.base64EncodedStringWithOptions(nil)