在一个请求中上传多张图片 [英] Upload multiple images in one request

问题描述

我想在一个服务请求中上传多个图像.我怎样才能做到这一点.到目前为止，我可以像这样上传单个图像

I want to upload more than one image in single service request. How can I do that. As of now I am able to upload single image like as

 NSData *imageData = UIImageJPEGRepresentation(image, 90);


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


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

NSMutableData *postBody = [NSMutableData data];

// file
[postBody appendData:[[NSString stringWithFormat:@"\r\n--%@\r\n",boundary] dataUsingEncoding:NSUTF8StringEncoding]];
[postBody appendData:[[NSString stringWithString:[NSString stringWithFormat:@"Content-Disposition: form-data; name=\"files\"; filename=\"%@\"\r\n",@"imagename"]] dataUsingEncoding:NSUTF8StringEncoding]];
[postBody appendData:[@"Content-Type: application/octet-stream\r\n\r\n" dataUsingEncoding:NSUTF8StringEncoding]];
[postBody appendData:[NSData dataWithData:imageData]];
[postBody appendData:[[NSString stringWithFormat:@"\r\n--%@--\r\n",boundary] dataUsingEncoding:NSUTF8StringEncoding]];


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

现在我想将两个图像上传到服务器，我该怎么做.

Now I want to upload two images to server how can I do that.

推荐答案

您的答案在这里.经过测试，我正在使用以下方法上传多个图像以及其他参数.

Your answer is here. It's tested and I am using this below methods to upload multiple image along with other parameters.

- (void)uploadMultipleImageInSingleRequest
{

    NSString *returnString;
    NSDictionary *aParametersDic; // It's contains other parameters.
    NSDictionary *aImageDic; // It's contains multiple image data as value and a image name as key
    NSString *urlString; // an url where the request to be posted
    NSURL *url = [NSURL URLWithString:urlString];
    NSMutableURLRequest *request= [[NSMutableURLRequest alloc] initWithURL:url] ;

    [request setURL:[NSURL URLWithString:urlString]];
    [request setHTTPMethod:@"POST"];
    NSString *boundary = @"---------------------------14737809831466499882746641449";
    NSString *contentType = [NSString stringWithFormat:@"multipart/form-data; boundary=%@",boundary];
    [request addValue:contentType forHTTPHeaderField: @"Content-Type"];

    NSMutableData *postbody = [NSMutableData data];
    NSString *postData = [self getHTTPBodyParamsFromDictionary:aParametersDic boundary:boundary];
    [postbody appendData:[postData dataUsingEncoding:NSUTF8StringEncoding]];

    [aImageDic enumerateKeysAndObjectsUsingBlock:^(id key, id obj, BOOL *stop) {
        if(obj != nil)
        {
            [postbody appendData:[[NSString stringWithFormat:@"\r\n--%@\r\n",boundary] dataUsingEncoding:NSUTF8StringEncoding]];
            [postbody appendData:[[NSString stringWithFormat:@"Content-Disposition: form-data; name=\"PostedImage\"; filetype=\"image/png\"; filename=\"%@\"\r\n", key] dataUsingEncoding:NSUTF8StringEncoding]];
            [postbody appendData:[@"Content-Type: image/jpeg\r\n\r\n" dataUsingEncoding:NSUTF8StringEncoding]];
            [postbody appendData:[NSData dataWithData:obj]];
        }
    }];

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

    NSData *returnData = [NSURLConnection sendSynchronousRequest:request returningResponse:nil error:nil];
    returnString = [[NSString alloc] initWithData:returnData encoding:NSUTF8StringEncoding];
}

.

-(NSString *) getHTTPBodyParamsFromDictionary: (NSDictionary *)params boundary:(NSString *)boundary
{
    NSMutableString *tempVal = [[NSMutableString alloc] init];
    for(NSString * key in params)
    {
        [tempVal appendFormat:@"\r\n--%@\r\n", boundary];
        [tempVal appendFormat:@"Content-Disposition: form-data; name=\"%@\"\r\n\r\n%@",key,[params objectForKey:key]];
    }
    return [tempVal description];
}

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