1

重複の可能性:
NSUrlRequest からの httpcontext から変数を取得

この質問は、Iphone と asp.net サーバー間の http 接続 "POST" に関する優れたチュートリアルになります :) 私がやろうとしているのは、iphone から Asp.net サーバーに画像を送信することです。ここで、objective-c の uploadImage 関数:

- (IBAction)uploadImage {
/*
 turning the image into a NSData object
 getting the image back out of the UIImageView
 setting the quality to 90
*/
NSData *imageData = UIImageJPEGRepresentation(image.image, 33);
// setting up the URL to post to
NSString *urlString = @"MyWebServiceUrl";

// setting up the request object now
NSMutableURLRequest *request = [[[NSMutableURLRequest alloc] init] autorelease];
[request setURL:[NSURL URLWithString:urlString]];
[request setHTTPMethod:@"POST"];

/*
 add some header info now
 we always need a boundary when we post a file
 also we need to set the content type

 You might want to generate a random boundary.. this is just the same 
 as my output from wireshark on a valid html post
*/
NSString *boundary = [NSString stringWithString:@"---------------------------14737809831466499882746641449"];
NSString *contentType = [NSString stringWithFormat:@"multipart/form-data; boundary=%@",boundary];
[request addValue:contentType forHTTPHeaderField: @"Content-Type"];

/*
 now lets create the body of the post
*/
NSMutableData *body = [NSMutableData data];
[body appendData:[[NSString stringWithFormat:@"\r\n--%@\r\n",boundary] dataUsingEncoding:NSUTF8StringEncoding]];    
[body appendData:[[NSString stringWithString:@"Content-Disposition: form-data; filepath=\"ProfilePic\"; filename=\"ipodfile\"\r\n"] dataUsingEncoding:NSUTF8StringEncoding]];
[body appendData:[[NSString stringWithString:@"Content-Type: application/octet-stream\r\n\r\n"] dataUsingEncoding:NSUTF8StringEncoding]];
[body appendData:[NSData dataWithData:imageData]];
[body appendData:[[NSString stringWithFormat:@"\r\n--%@--\r\n",boundary] dataUsingEncoding:NSUTF8StringEncoding]];
// setting the body of the post to the reqeust
[request setHTTPBody:body];

// now lets make the connection to the web
NSData *returnData = [NSURLConnection sendSynchronousRequest:request returningResponse:nil error:nil];
NSString *returnString = [[NSString alloc] initWithData:returnData encoding:NSUTF8StringEncoding];

NSLog(@"%@", returnString);

}

そして、送信されたデータを解析してファイルを保存する私の webService Fonctions は次のとおりです。

public class SaveData : IHttpHandler
{

    public void ProcessRequest(HttpContext context)
    {
        context.Response.ContentType = "text/plain";
        bool hasErrors = false;
        HttpFileCollection filesPosted = context.Request.Files;
        String filePath = context.Request.QueryString["filepath"];
        String fileName = context.Request.QueryString["filename"];
        try
        {
            if (String.IsNullOrEmpty(fileName) || String.IsNullOrEmpty(filePath) || filesPosted.Count <= 0)
                hasErrors = true;

            if (!hasErrors)
            {
                HttpContext.Current.Response.Write(WriteFile(filesPosted[0], filePath, fileName));
            }
            else
            {
                context.Response.Write("Failed: parsing error");
            }
        }
        catch (Exception ex)
        {
            context.Response.Write("Failed: exception error:::" + ex.Message);
        }

    }

    private string WriteFile(HttpPostedFile file, String filePath, String fileName)
    {
        System.IO.Directory.CreateDirectory(filePath);
        int counter = 0;
        string path = String.Format("{0}\\{1}.jpg", filePath, fileName);
        while (System.IO.File.Exists(path))
        {
            counter++;
            path = String.Format("{0}\\{1}-{2}.jpg", filePath, fileName, counter);
        }

        file.SaveAs(path);
        return path;
    }

    public bool IsReusable
    {
        get
        {
            return false;
        }
    }
}

私の問題はこの2行から来ています

        String filePath = context.Request.QueryString["filepath"];
        String fileName = context.Request.QueryString["filename"];

context.Request.QueryString が null を返すため、hasErrors は false; それを修正する方法についてのアイデアは非常に高く評価されます。すべてに感謝します。

4

1 に答える 1

0

1日試した後の解決策は次のとおりです。

クライアントコード:

// 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", @"filename"] dataUsingEncoding:NSUTF8StringEncoding]];
[body appendData:[[NSString stringWithFormat:@"%@\r\n", imageName] 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=\"myImage\"; filename=\"image.jpg\"\r\n"] dataUsingEncoding:NSUTF8StringEncoding]];
    [body appendData:[[NSString stringWithString:@"Content-Type: image/jpeg\r\n\r\n"] dataUsingEncoding:NSUTF8StringEncoding]];
    [body appendData:imageData];
    [body appendData:[[NSString stringWithFormat:@"\r\n"] dataUsingEncoding:NSUTF8StringEncoding]];
}

Asp.net サーバー コード:

String filePath = context.Request.Form["filename"];

この質問が気に入っていただければ幸いです（チュートリアル）;）

于 2012-05-12T15:58:15.897 に答える