使用Alamofire url下载pdf文件响应错误

Question

class func downloadPdf(pdfReport: String, completion: @escaping (_ error: Error?, _ success: Bool,_ value: String) -> Void) {

    let downloadUrl: String = URLs.pdfFileUrl + pdfReport
    let destination = DownloadRequest.suggestedDownloadDestination()

    print(downloadUrl, destination)
    Alamofire.download(downloadUrl, method: .get, parameters: nil, encoding: JSONEncoding.default, to: destination).responseJSON { response in

        switch response.result {
        case .failure(let error):
            print("error: ", error)
            print(error.localizedDescription)
            completion(error, false, "")
        case .success(let value):
            let json = JSON(value)
            print(json)
            print("successss")
            completion(nil, true, "")
        }
    }
}

func downloadPdf() {
    KRProgressHUD.show(withMessage: NSLocalizedString("wait", comment: "wait"))
    API.downloadPdf(pdfReport: self.report.report){ (error: Error?, success: Bool, result: String) in
        if success {
            KRProgressHUD.dismiss()
        } else {
            KRProgressHUD.dismiss()
            if (!Connectivity.isConnectedToNetwork()){
                Toast.toast(messsage: NSLocalizedString("no internet", comment: "no internet"), view: self.view)
            } else {
                Toast.toast(messsage: NSLocalizedString("error occured", comment: "error occured"), view: self.view)
            }
        }
    }
}

当我第一次调用downloadpdf方法时，它成功地下载了文件，但我得到了以下错误：

https：//madrasty.dev.ibtdi.work/public/reports/15287105135b1e4571f2596-new.pdf（函数）错误：responseSerializationFailed（AlamoFire.Aferror.ResponseSerializationFailureRereason.JsonSerializationFailed（错误域=nscocoAerrordomain代码=3840“字符0附近的值无效。”UserInfo={NsDebugDescription=字符0附近的值无效。}））无法序列化JSON，原因是错误：.

如果再次调用该方法,则会出现以下错误：

错误：Error domain=nscocoaerrordomain code=516“invirons”cfnetworkdownload_wbv95z.tmp“”documents“...”userInfo={nsSourceFilePatherRokey=/users/IBTDI/Library/Developer/CoreSimulator/Devices/10CB5B13-42C2-4646-934C-67FD33C948C5/Data/Containers/Data/Application/F894940C-0D55-4953-A9FA-E852C1C4B440/TMP/CFNetworkDownload_WBV95z.tmp,nsUserStringVariant=(Move),

这个错误是因为在同一个目录中有一个同名的文件，我尝试使用responsestring而不是responsejson但是这并不能解决我的问题，我该怎么办呢？

Answer 1

您的代码中几乎没有错误：

1. 它是数据任务，而不是Vadian指出的JSON任务。

将下载功能更改为：

func downloadPdf(pdfReport: String, uniqueName: String, completionHandler:@escaping(String, Bool)->()){

    let downloadUrl: String = URLs.pdfFileUrl + pdfReport
    let destinationPath: DownloadRequest.DownloadFileDestination = { _, _ in
        let documentsURL = FileManager.default.urls(for: .documentDirectory, in: .userDomainMask)[0];
        let fileURL = documentsURL.appendingPathComponent("\(uniqueName).pdf")
        return (fileURL, [.removePreviousFile, .createIntermediateDirectories])
    }
    print(downloadUrl)
    Alamofire.download(downloadUrl, to: destinationPath)
        .downloadProgress { progress in

        }
        .responseData { response in
            print("response: \(response)")
            switch response.result{
            case .success:
                if response.destinationURL != nil, let filePath = response.destinationURL?.absoluteString {
                    completionHandler(filePath, true)
                }
                break
            case .failure:
                completionHandler("", false)
                break
            }

    }
}

您的错误是：

错误域=nsposixerrordomain code=17“文件存在”

清楚地告诉在该文件路径上已经有一个文件。因此，如果前面的文件有的话，这段代码将删除它。