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我知道这似乎特定于手头的问题，但是，这是我试图避免可可豆荚的可怕 UploadCare 使用，其中包含大量（而且相当过时）依赖项，只是上传文件（然后下载它日后）。

我正在努力翻译 cURL 命令中的“-F”选项。我知道他们指定了 HTTP 多部分 POST 数据，但是很难将其转换为带有图片文件的 NSMutableData。我不断收到 403 状态码。

cURL 命令是：

curl -F "UPLOADCARE_PUB_KEY=e84a031b3da1g560d56d"  \
-F "UPLOADCARE_STORE=1"  \
-F "file=@aaronmillman.jpg" https://upload.uploadcare.com/base/

我目前的尝试是：

NSMutableData *body = [NSMutableData data];
NSData *imageData = UIImageJPEGRepresentation(image, 0.6);
if (imageData) {
    [body appendData:[@"UPLOADCARE_PUB_KEY=e84a031b3da1g560d56d" dataUsingEncoding:NSUTF8StringEncoding]];
    [body appendData:[@"UPLOADCARE_STORE=1" dataUsingEncoding:NSUTF8StringEncoding]];

    [body appendData:[[NSString stringWithFormat:@"file="] dataUsingEncoding:NSUTF8StringEncoding]];
    [body appendData:imageData];
}

NSURLSessionConfiguration *sessionConfiguration = [NSURLSessionConfiguration defaultSessionConfiguration];

NSURLSession *session = [NSURLSession sessionWithConfiguration:sessionConfiguration delegate:self delegateQueue:nil];

NSURL *url = [NSURL URLWithString:baseUrl];
NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:url];
request.HTTPMethod = @"POST";
request.HTTPBody = imageData;
NSURLSessionDataTask *uploadTask = [session dataTaskWithRequest:request completionHandler:^(NSData *data, NSURLResponse *response, NSError *error) {
    NSLog(@"%@",response);
}];
[uploadTask resume];

我对 NSMutableData 做错了什么？

第二个相关的问题是：是否值得使用 Objective-C lib curl 包装器？

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1 回答 1

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    NSMutableURLRequest *request = [[NSMutableURLRequest alloc] initWithURL:[NSURL URLWithString:@"https://upload.uploadcare.com/base/"]];

    UIImage *image = [UIImage imageNamed:@"image.jpg"];
    NSData *imageData = UIImageJPEGRepresentation(image, 1.0);

    [request setHTTPMethod:@"POST"];

    NSString *boundary = @"unique-consistent-string";

    // set Content-Type in HTTP header
    NSString *contentType = [NSString stringWithFormat:@"multipart/form-data; boundary=%@", boundary];
    [request setValue:contentType forHTTPHeaderField: @"Content-Type"];

    // post body
    NSMutableData *body = [NSMutableData data];

    // add params (all params are strings)
    [body appendData:[[NSString stringWithFormat:@"--%@\r\n", boundary] dataUsingEncoding:NSUTF8StringEncoding]];
    [body appendData:[[NSString stringWithFormat:@"Content-Disposition: form-data; name=%@\r\n\r\n", @"UPLOADCARE_PUB_KEY"] dataUsingEncoding:NSUTF8StringEncoding]];
    [body appendData:[[NSString stringWithFormat:@"%@\r\n", @"demopublickey"] dataUsingEncoding:NSUTF8StringEncoding]];

    [body appendData:[[NSString stringWithFormat:@"--%@\r\n", boundary] dataUsingEncoding:NSUTF8StringEncoding]];
    [body appendData:[[NSString stringWithFormat:@"Content-Disposition: form-data; name=%@\r\n\r\n", @"UPLOADCARE_STORE"] dataUsingEncoding:NSUTF8StringEncoding]];
    [body appendData:[[NSString stringWithFormat:@"%@\r\n", @"1"] dataUsingEncoding:NSUTF8StringEncoding]];

    // add image data
    if (imageData) {
        [body appendData:[[NSString stringWithFormat:@"--%@\r\n", boundary] dataUsingEncoding:NSUTF8StringEncoding]];
        [body appendData:[[NSString stringWithFormat:@"Content-Disposition: form-data; name=file; filename=image.jpg\r\n"] dataUsingEncoding:NSUTF8StringEncoding]];
        [body appendData:[@"Content-Type: image/jpeg\r\n\r\n" dataUsingEncoding:NSUTF8StringEncoding]];
        [body appendData:imageData];
        [body appendData:[[NSString stringWithFormat:@"\r\n"] dataUsingEncoding:NSUTF8StringEncoding]];
    }

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

    // setting the body of the post to the reqeust
    [request setHTTPBody:body];

    // set the content-length
    NSString *postLength = [NSString stringWithFormat:@"%d", [body length]];
    [request setValue:postLength forHTTPHeaderField:@"Content-Length"];

    [NSURLConnection sendAsynchronousRequest:request
                                       queue:[NSOperationQueue currentQueue]
                           completionHandler:^(NSURLResponse *response, NSData *data, NSError *error) {

                               if (data.length > 0) {
                                   NSLog(@"%@", [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding]);
                               }
    }];

http://nthn.me/posts/2012/objc-multipart-forms.html

https://gist.github.com/mombrea/8467128

于 2014-09-03T09:48:50.673 回答