NSURLSessionUploadTask不上传带有参数的图像

Question

下面的代码向我的服务器发送了一个图像和一些文本：

 NSURLSessionConfiguration *defaultConfigObject = [NSURLSessionConfiguration defaultSessionConfiguration];

    self.session = [NSURLSession sessionWithConfiguration: defaultConfigObject delegate:self delegateQueue: nil];

    NSString *requestURL = @"http://www.website.com.br/receive.php?name=StackOverflow";

    NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:[NSURL URLWithString:requestURL]];

    [request setHTTPMethod:@"POST"];

    UIImage *imagem = [UIImage imageNamed:@"Image.jpg"];

    NSData *imageData = UIImageJPEGRepresentation(imagem, 1.0);

    self.uploadTask = [self.session uploadTaskWithRequest:request fromData:imageData];

    [self.uploadTask resume];


-(void)URLSession:(NSURLSession *)session
         dataTask:(NSURLSessionDataTask *)dataTask didReceiveData:(NSData *)data{

    NSString* newStr = [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding];
    NSLog(@"%@",newStr);
}

<?php
echo $_POST['name'];
?>

此代码的问题在于，didReceiveData方法没有接收到服务器的数据，只有当我将该代码放入php文件中时，它才会得到一个NSData：

print_r($_FILES);

然而，它返回一个空数组，为什么会发生这种情况？

解决了

好吧，我解决了我的问题，让我们开始吧，在.h文件中，您需要实现这个协议和一个属性：

< NSURLSessionDelegate, NSURLSessionTaskDelegate>
@property (nonatomic) NSURLSessionUploadTask *uploadTask;

虽然在.m文件中有一个IBAction类型的方法，并且它连接到我们认为存在的一个特定按钮，但是我们只需要这样做：

- (IBAction)start:(id)sender {

    if (self.uploadTask) {
        NSLog(@"Wait for this process finish!");
        return;
    }

   NSString *imagepath = [[self applicationDocumentsDirectory].path stringByAppendingPathComponent:@"myImage.jpg"];
    NSURL *outputFileURL = [NSURL fileURLWithPath:imagepath];


    // Define the Paths
    NSURL *icyURL = [NSURL URLWithString:@"http://www.website.com/upload.php"];

    // Create the Request
    NSMutableURLRequest* request = [NSMutableURLRequest requestWithURL:icyURL];
    [request setHTTPMethod:@"POST"];

    // Configure the NSURL Session
    NSURLSessionConfiguration *sessionConfig = [NSURLSessionConfiguration backgroundSessionConfigurationWithIdentifier:@"com.sometihng.upload"];

    NSURLSession *upLoadSession = [NSURLSession sessionWithConfiguration:sessionConfig delegate:self delegateQueue:nil];

    // Define the Upload task
    self.uploadTask = [upLoadSession uploadTaskWithRequest:request fromFile:outputFileURL];

    // Run it!
    [self.uploadTask resume];

}

并执行一些委托方法：

- (void)URLSession:(NSURLSession *)session task:(NSURLSessionTask *)task didSendBodyData:(int64_t)bytesSent totalBytesSent:(int64_t)totalBytesSent totalBytesExpectedToSend:(int64_t)totalBytesExpectedToSend {

    NSLog(@"didSendBodyData: %lld, totalBytesSent: %lld, totalBytesExpectedToSend: %lld", bytesSent, totalBytesSent, totalBytesExpectedToSend);

}

- (void)URLSession:(NSURLSession *)session task:(NSURLSessionTask *)task didCompleteWithError:(NSError *)error { 
    if (error == nil) {
        NSLog(@"Task: %@ upload complete", task);
    } else {
        NSLog(@"Task: %@ upload with error: %@", task, [error localizedDescription]);
    }
}

为了完成，您需要用以下代码创建一个PHP文件：

<?php

$fp = fopen("myImage.jpg", "a");//If image come is .png put myImage.png, is the file come is .mp4 put myImage.mp4, if .pdf myImage.pdf, if .json myImage.json ...

$run = fwrite($fp, file_get_contents("php://input"));

fclose($fp);

?>

Answer 1

将图像上传到dropbox的代码示例。

// 1. config
NSURLSessionConfiguration *config = [NSURLSessionConfiguration defaultSessionConfiguration];

// 2. if necessary set your Authorization HTTP (example api)
// [config setHTTPAdditionalHeaders:@{@"<setYourKey>":<value>}];

// 3. Finally, you create the NSURLSession using the above configuration.
NSURLSession *session = [NSURLSession sessionWithConfiguration:config];

// 4. Set your Request URL (example using dropbox api)
NSURL *url = [Dropbox uploadURLForPath:<yourFullPath>];;
NSMutableURLRequest *request = [[NSMutableURLRequest alloc] initWithURL:url];

// 5. Set your HTTPMethod POST or PUT
[request setHTTPMethod:@"PUT"];

// 6. Encapsulate your file (supposse an image)
UIImage *image = [UIImage imageNamed:@"imageName"];
NSData *imageData = UIImageJPEGRepresentation(image, 1.0);

// 7. You could try use uploadTaskWithRequest fromData
NSURLSessionUploadTask *taskUpload = [session uploadTaskWithRequest:request fromData:imageData completionHandler:^(NSData *data, NSURLResponse *response, NSError *error) {

    NSHTTPURLResponse *httpResp = (NSHTTPURLResponse*) response;
    if (!error && httpResp.statusCode == 200) {

        // Uploaded

    } else {

       // alert for error saving / updating note
       NSLog(@"ERROR: %@ AND HTTPREST ERROR : %ld", error, (long)httpResp.statusCode);
      }
}];

- (NSURL*)uploadURLForPath:(NSString*)path
{
    NSString *urlWithParams = [NSString stringWithFormat:@"https://api-content.dropbox.com/1/files_put/sandbox/%@/%@",
                               appFolder,
                               [path stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding]];    
    NSURL *url = [NSURL URLWithString:urlWithParams];
    return url;
}

Answer 2

您应该将NSData转换为更易于管理的格式，如NSArray。要做到这一点，您必须尝试如下：

NSArray *array = [NSKeyedUnarchiver unarchiveObjectWithData:data]