objective-c - 使用 NSUrlRequest 上传文件会导致零字节文件大小

Question

我正在尝试使用目标 c 和 NSUrlRequest 进行简单的文件上传。

我当前的（或多或少用谷歌搜索并放在一起）代码：

NSMutableURLRequest *request = [[NSMutableURLRequest alloc] init];
[request setURL:[NSURL URLWithString:@"http://127.0.0.1:8000/api/upload/"]];
[request setHTTPMethod:@"POST"];


NSString *boundary = [NSString stringWithString:@"---------------------------14737809831466499882746641449"];
NSString *contentType = [NSString stringWithFormat:@"multipart/form-data; boundary=%@",boundary];
[request addValue:contentType forHTTPHeaderField: @"Content-Type"];


NSMutableData *postData = [NSMutableData data]; 
[postData appendData:[[NSString stringWithFormat:@"\r\n--%@\r\n", boundary] dataUsingEncoding:NSUTF8StringEncoding]];

// Append the Usertoken
[postData appendData:[[NSString stringWithString:@"Content-Disposition: form-data; name=\"token\"\r\n"] dataUsingEncoding:NSUTF8StringEncoding]];
[postData appendData:[[NSString stringWithString:@"Content-Type: application/json\r\n\r\n"] dataUsingEncoding:NSUTF8StringEncoding]];
[postData appendData:[[NSString stringWithFormat:@"%@", token] dataUsingEncoding:NSUTF8StringEncoding]];

// Append the file
[postData appendData:[[NSString stringWithFormat:@"\r\n--%@\r\n", boundary] dataUsingEncoding:NSUTF8StringEncoding]];    
[postData appendData:[[NSString stringWithFormat:@"Content-Disposition: form-data; name=\"fileupload\"; filename=\"%@\"\r\n", file]dataUsingEncoding:NSUTF8StringEncoding]];
[postData appendData:[[NSString stringWithString:@"Content-Type: application/octet-stream\r\n\r\n"] dataUsingEncoding:NSUTF8StringEncoding]];

// Close
[postData appendData:[[NSString stringWithFormat:@"\r\n--%@--\r\n", boundary] dataUsingEncoding:NSUTF8StringEncoding]];

// Append
[request setHTTPBody:postData];

所有上传的文件都具有零字节文件大小。服务器端部分工作正常。用 cURL 测试。

我忘了什么吗？

Answer 1

发现我的错误。是一个非常简单的问题，因为我对 http 缺乏了解而发生的。

我忘了在八位字节流之后附加文件数据

NSData *photo = [[NSFileManager defaultManager] contentsAtPath:file];

// Append the file
[postData appendData:[[NSString stringWithFormat:@"\r\n--%@\r\n", boundary] dataUsingEncoding:NSUTF8StringEncoding]];    
[postData appendData:[[NSString stringWithFormat:@"Content-Disposition: form-data; name=\"fileupload\"; filename=\"%@\"\r\n", file]dataUsingEncoding:NSUTF8StringEncoding]];
[postData appendData:[[NSString stringWithString:@"Content-Type: application/octet-stream\r\n\r\n"] dataUsingEncoding:NSUTF8StringEncoding]];
[postData appendData:[NSData dataWithData:photo]];