我正在尝试使用多部分表单数据使用- (NSURLSessionUploadTask *)uploadTaskWithRequest:(NSURLRequest *)request fromFile:(NSURL *)fileURL;
方法上传视频/图像文件。但不知何故，我无法上传文件，我得到了＆＃34; stream ended unexpectedly＆＃34;错误。
要求
方法/ API用于实现此目的
NSURLSession后台会话API（下面列出的完整代码）
2。- (NSURLSessionUploadTask *)uploadTaskWithRequest:(NSURLRequest *)request fromFile:(NSURL *)fileURL
面临的挑战/问题
stream ended unexpectedly＆＃34;每次我使用此API进行上传过程时出现错误需要注意的要点
如果我使用的是NSURLConnection而不是NSURLSession，则使用相同的代码上传会成功。
NSURLSession后台上传进程期望文件位置（NSURL）作为参数，不接受NSData。它不允许我们在上传之前将文件转换为NSData，即我们无法将NSData添加到文件正文中。
需要以下几点的帮助
正在形成的multipart formdata正文中是否有任何错误（注意 - 相同的代码与NSURLConnection一起使用）
我的方法在哪里出错？
我们是否需要在服务器级别进行任何更改以支持NSURLSession backgroundSession上传？ （在数据解析或其他什么？）
以下是用于上传文件的代码
NSString * BoundaryConstant = @＆＃34; ---------- V2ymHFg03ehbqgZCaKO6jy＆＃34 ;;
// string constant for the post parameter 'file'. My server uses this name: `file`. Your's may differ
NSString* FileParamConstant = @"file";
// the server url to which the image (or video) is uploaded. Use your server url here
url=[NSURL URLWithString:[NSString stringWithFormat:@"%@%@%d",baseURL,@"posts/post/update/",createPostObject.PostID]];
// create request
NSMutableURLRequest *request = [[NSMutableURLRequest alloc] init];
[request setCachePolicy:NSURLRequestReloadIgnoringLocalCacheData];
[request setHTTPShouldHandleCookies:NO];
[request setTimeoutInterval:120];
[request setHTTPMethod:@"POST"];
[request addValue:@"multipart/form-data" forHTTPHeaderField:@"Content-Type"];
[request setURL:url];
// set Content-Type in HTTP header
NSString *contentType = [NSString stringWithFormat:@"multipart/form-data; boundary=%@", BoundaryConstant];
[request setValue:contentType forHTTPHeaderField: @"Content-Type"];
if([[NSUserDefaults standardUserDefaults] objectForKey:@"accessToken"]){
[request setValue:[[NSUserDefaults standardUserDefaults] objectForKey:@"accessToken"] forHTTPHeaderField:AccessTokenKey];
}
// post body
NSMutableData *body = [NSMutableData data];
// add params (all params are strings)
for (NSString *param in self.postParams) {
NSLog(@"param is %@",param);
[body appendData:[[NSString stringWithFormat:@"--%@\r\n", BoundaryConstant] dataUsingEncoding:NSUTF8StringEncoding]];
[body appendData:[[NSString stringWithFormat:@"Content-Disposition: form-data; name=\"%@\"\r\n\r\n", param] dataUsingEncoding:NSUTF8StringEncoding]];
[body appendData:[[NSString stringWithFormat:@"%@\r\n", [self.postParams objectForKey:param]] dataUsingEncoding:NSUTF8StringEncoding]];
}
// add video file name to body
[body appendData:[[NSString stringWithFormat:@"--%@\r\n", BoundaryConstant] dataUsingEncoding:NSUTF8StringEncoding]];
[body appendData:[[NSString stringWithFormat:@"Content-Disposition: form-data; name=\"%@\"; filename=\"file.mp4\"\r\n", FileParamConstant] dataUsingEncoding:NSUTF8StringEncoding]];
[body appendData:[[NSString stringWithString:@"Content-Type: video/mp4\r\n\r\n"] dataUsingEncoding:NSUTF8StringEncoding]];
// [body appendData:self.dataToPost];
[body appendData:[[NSString stringWithFormat:@"\r\n"] dataUsingEncoding:NSUTF8StringEncoding]];
[body appendData:[[NSString stringWithFormat:@"--%@--\r\n", BoundaryConstant] dataUsingEncoding:NSUTF8StringEncoding]];
// setting the body of the post to the request
[request setHTTPBody:body];
// set the content-length
NSString *postLength = [NSString stringWithFormat:@"%lu", (unsigned long)[body length]];
[request setValue:postLength forHTTPHeaderField:@"Content-Length"];
NSLog(@"Request body %@", [[NSString alloc] initWithData:[request HTTPBody] encoding:NSUTF8StringEncoding]);
NSURLSessionConfiguration * backgroundConfig = [NSURLSessionConfiguration backgroundSessionConfigurationWithIdentifier:@"backgroundtask1"];
NSURLSession *backgroundSeesion = [NSURLSession sessionWithConfiguration: backgroundConfig delegate:self delegateQueue: [NSOperationQueue mainQueue]];
NSURLSessionUploadTask *uploadTask = [backgroundSeesion uploadTaskWithRequest:request fromFile:self.videoUrl];
[uploadTask resume];
答案 0 :(得分：10)
您没有上传您认为自己的内容。您的目的是按原样上传正文数据。相反，当您调用uploadTaskWithRequest:fromFile:时，该方法会有效地将请求中的任何HTTPBody或HTTPBodyStream值取消，并将其替换为您通过{{1传入的URL的内容参数。
因此，除非您将表格编码的正文数据块写入其他地方的文件URL，否则您将自己上传文件而不是多部分表单数据。
您需要调整代码以将表单数据写入文件，而不是将其存储在fromFile:中，然后将该文件的URL传递给HTTPBody参数。
答案 1 :(得分：5)
防止浪费时间处理它。
基于@dgatwood答案的完整代码段
@foreach ($categories as $category)
<tr data-id="{{ $category->id }}">
<td>{{ $category->id }}</td>
<td>{{ $category->name }}</td>
<td id="actions">
<a href="{{ url('admin/category/' . $category->id . '/get') }}">Show</a>
<a href="{{ url('admin/category/' . $category->id . '/edit') }}">Edit</a>
<a href="#" data-toggle="modal" data-target="#confirmDeleteModal">Delete</a>
<confirm-delete-modal item="category" id="{{ $category->id }}" name="{{ $category->name }}"></confirm-delete-modal>
</td>
</tr>
@endforeach并且..不要忘记在请求对象上添加标题，如
getUsersForConversations(conversations) {
conversations.forEach((conversation, index) => {
// Get user out of local storage
this.storage.get('user').then(user => {
let userKeys = Object.keys(conversation.users);
let sub = Observable
.from(userKeys)
.filter(key => (key != user.id && key.length > 0))
.flatMap(key =>
Observable.zip(
Observable.of(key),
this._af.database.object(`/social/conversations_last_deleted/${conversation.$key}/${user.id}`)
.filter(lastDeleted => (lastDeleted && (lastDeleted.$value !== null)))
.flatMap(lastDeleted => this._messages.getMessagesForConvo(conversation.$key, lastDeleted)),
(key, messages) => {
if (messages.length === 0) {
return null;
}
return key;
})
)
.filter(key => key != null)
.flatMap(userKey => this._af.database.object(`/social/users/${userKey}`))
.subscribe(users => {
conversations[index].users = users;
this.conversations = conversations;
});
// REMEMBER TO ALWAYS UNSUBSCRIBE!!!! or you will have memory leaks....
sub.unsubscribe();
});
});
}