如何使用字典 iOS 在服务器上发布图像？

Question

我有一些键/值的dictionary (dict) 和一个image。现在我想用字典将图像上传到服务器。我已经尝试过了，但没有取得任何成功。这是我的示例代码--

NSMutableURLRequest *request = [[NSMutableURLRequest alloc] init];

[request setURL:[NSURL URLWithString:urlString]];

[request setHTTPMethod:@"POST"];

NSMutableData *body = [NSMutableData data];

NSString *boundary = @"---------------------------14737809831466499882746641449";

NSString *contentType = [NSString stringWithFormat:@"multipart/form-data; boundary=%@",boundary];

[request addValue:contentType forHTTPHeaderField: @"Content-Type"];

NSData *imageData = UIImageJPEGRepresentation(image,0.5);//or you can use png representation- UIImagePNGRepresentation(image);

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

[body appendData:[@"Content-Disposition: form-data; name=\"thumbnail\"; filename=\"image.png\"\r\n" dataUsingEncoding:NSUTF8StringEncoding]];

[body appendData:[@"Content-Type: image/png\r\n\r\n" dataUsingEncoding:NSUTF8StringEncoding]];

[body appendData:imageData];

[body appendData:[@"\r\n" dataUsingEncoding:NSUTF8StringEncoding]];

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

[body appendData:[[NSString stringWithFormat:@"Content-Disposition: form-data; name=\"all_data\"\r\n\r\n"] dataUsingEncoding:NSUTF8StringEncoding]];

[body appendData:[[NSString stringWithFormat:@"%@",dict] dataUsingEncoding:NSUTF8StringEncoding]];

[body appendData:[@"\r\n" dataUsingEncoding:NSUTF8StringEncoding]];

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

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

NSError *error=nil;
NSHTTPURLResponse *response=nil;
NSData *urlData=[NSURLConnection sendSynchronousRequest:request returningResponse:&response error:&error];

我需要帮助我哪里出错了..提前谢谢

Answer 1

试试下面的代码：

    -(void)uploadImage:(NSString *)api :(NSDictionary *)params : (UIImage *)image {

    NSURL *myURL = [NSURL URLWithString:api];
    NSMutableURLRequest *request = [[NSMutableURLRequest alloc] initWithURL:myURL];
    [request setHTTPMethod:@"POST"];
    [request setValue:@"application/json" forHTTPHeaderField:@"Accept"];
    NSString *boundary = @"---------------------------14737809831466499882746641449";
    NSString *contentType = [NSString stringWithFormat:@"multipart/form-data; boundary=%@; charset=UTF-8", boundary];
    [request addValue:contentType forHTTPHeaderField:@"Content-Type"];
    NSMutableData *theBodyData = [NSMutableData data];
    for (int i=0; i<[[params allKeys] count]; i++)
    {
        [theBodyData appendData:[[NSString stringWithFormat:@"--%@\r\n", boundary] dataUsingEncoding:NSUTF8StringEncoding]];
        NSString *value=@"";
        value=[params objectForKey:[[params allKeys] objectAtIndex:i]];
        NSString * value1=[NSString stringWithFormat:@"Content-Disposition: form-data; name=%@\r\n\r\n%@\r\n",[[params allKeys] objectAtIndex:i],value];
        [theBodyData appendData:[value1 dataUsingEncoding:NSUTF8StringEncoding]];
    }

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

    [theBodyData appendData:[@"Content-Disposition: form-data; name=\"my_file1\"; filename=\"image1.jpeg\"\r\n" dataUsingEncoding:NSASCIIStringEncoding]];

    [theBodyData appendData:[@"Content-Type: application/octet-stream\r\n\r\n" dataUsingEncoding:NSASCIIStringEncoding]];
    NSData *myData = UIImageJPEGRepresentation(image,0.5);
    [theBodyData appendData:[NSData dataWithData:myData]];

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



    [request setHTTPBody:theBodyData];
    [request setValue:contentType forHTTPHeaderField: @"Content-Type"];
    [request setValue:[NSString stringWithFormat:@"%d", (int)[theBodyData length]] forHTTPHeaderField:@"Content-Length"];
    [request setHTTPBody: theBodyData];

    NSURLSessionConfiguration *config = [NSURLSessionConfiguration defaultSessionConfiguration];
    NSURLSession *session = [NSURLSession sessionWithConfiguration:config];

    NSURLSessionDataTask * dataTask =[session dataTaskWithRequest:request completionHandler:^(NSData *data, NSURLResponse *response, NSError *error) {
        if(error == nil) {
            NSString *responseString = [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding];
            NSLog(@"Server Raw Response : %@",responseString);
        }

    }];

    [dataTask resume];


}

Answer 2

您的代码看起来不错，但我认为您必须将您的字典转换为json string。只需替换此行-

[body appendData:[[NSString stringWithFormat:@"%@",dict] dataUsingEncoding:NSUTF8StringEncoding]];

与

NSString *jsonStr = [[NSString alloc]initWithData:[NSJSONSerialization dataWithJSONObject:dict options:NSJSONWritingPrettyPrinted error:nil] encoding:NSUTF8StringEncoding];

[body appendData:[jsonStr dataUsingEncoding:NSUTF8StringEncoding]];

也许这会对你有所帮助。