ios - AFNetworking上传图片，

Question

我这里用AFNetworking上传图片
报The data couldn’t be read because it isn’t in the correct format.有人帮忙看看是哪里出问题了么？下面是我写的代码。

    AFHTTPRequestOperationManager *m = [AFHTTPRequestOperationManager manager];
    m.responseSerializer.acceptableContentTypes = [NSSet setWithObjects:@"text/html", @"application/json", nil];
    m.requestSerializer = [AFHTTPRequestSerializer serializer];
    [m.requestSerializer setValue:@"multipart/form-data" forHTTPHeaderField:@"Content-Type"];
    
    NS_APPDebugLog(@"请求链接：%@/%@", urlString, parametersDic);
    
    [m POST:@"http://59.48.96.118:7001/portal/SI_USR00025/upload.do" parameters:nil
                constructingBodyWithBlock:^(id<AFMultipartFormData>  _Nonnull formData) {
        for (int i = 0; i < imagePickerArray.count; i++)
        {
            UIImage *portraitImg = imagePickerArray[i];
            portraitImg = [UIImage scaleToSize:portraitImg];
            portraitImg = [portraitImg fixOrientation];
            NSData *imageData = [NSData compressImage:portraitImg];
            [formData appendPartWithFileData:imageData
                                        name:[NSString stringWithFormat:@"img.img%d", i+1]
                                    fileName:@"image.png"
                                    mimeType:@"image/png"];
        }
    } success:^(AFHTTPRequestOperation * _Nonnull operation, id  _Nonnull responseObject) {
        NSLog(@"成功");
    } failure:^(AFHTTPRequestOperation * _Nullable operation, NSError * _Nonnull error) {
        NSLog(@"失败");
        dispatch_async(dispatch_get_main_queue(),^{failure(error);});
    }];

Answer 1

这里有几个问题：

1. mime 的设置有一些矛盾：

   [m.requestSerializer setValue:@"multipart/form-data" forHTTPHeaderField:@"Content-Type"];

    [formData appendPartWithFileData:imageData name:[NSString stringWithFormat:@"img.img%d", i+1] fileName:@"image.png" mimeType:@"image/png"];

   这两个地方你分别设置了两种mime，multipart/form-data和image/png。哪一个是正确的？需要跟后台沟通一下。

2. 跟后台联调一下，收到你的请求了吗？请求什么内容？他返回的什么？这个错似乎一般是解析json的时候报，也许是后台没有返回合法 json。另外，你的请求是一次性上传多个文件，不知道你的后台接口是否支持，可以尝试只传一张图片。

3. AFNetworking 的块里不需要调dispatch_async(dispatch_get_main_queue()...它已经是帮你回到主线程执行的。

Answer 2

能否把 imageData 的数据打印出来？

Answer 3

请问lz解决了吗？
我也遇到报The data couldn’t be read because it isn’t in the correct format.
但是事实上图片上传成功了
客户端代码：- (IBAction)upload:(id)sender {

AFHTTPSessionManager *manager = [AFHTTPSessionManager manager];
 NSString *url3 = @"http://127.0.0.1:5000/upload";

[manager POST:url3 parameters:nil constructingBodyWithBlock:^(id<AFMultipartFormData> _Nonnull formData) {

    UIImage *image = [UIImage imageNamed:@"star"];
    NSData *imageData = UIImagePNGRepresentation(image);
    NSString *fileName = @"star.png";
    [formData appendPartWithFileData:imageData
                                name:@"file"
                            fileName:fileName
                            mimeType:@"image/png"];    
} progress:^(NSProgress *_Nonnull uploadProgress) {
} success:^(NSURLSessionDataTask *_Nonnull task, id _Nullable responseObject) {
    NSLog(@"upload completed：%@",responseObject);
} failure:^(NSURLSessionDataTask *_Nullable task, NSError * _Nonnull error) {
    NSLog(@"upload failed");
    NSLog(@"%@",error.localizedDescription);
}];

}

后端代码（python）：
class receive(restful.Resource):

def post(self):
    file = request.files['file']
    file.save(os.path.join(app.config['UPLOAD_FOLDER'], 'star2.png'))
    return 'upload completed'

api.add_resource(receive, '/upload', methods=['POST'])