如何在 NSMutableUrlRequest 中发布文本和图像数据？答案

【问题标题】：How to post text and image data in NSMutableUrlRequest?如何在 NSMutableUrlRequest 中发布文本和图像数据？
【发布时间】：2014-06-30 05:44:47
【问题描述】：

我应该发布在验证凭据和图像数据期间生成的会话 ID。但是图像和会话 ID 没有上传。当我使用 ASIHTTPRequest 时它工作正常，后来当我尝试使用 NSMutableUrlRequest 和 NSURLConnection 时它似乎不起作用。

下面给出的是用于 POST 图像和会话 ID 的代码

- (void)postinDataToServer:(NSData *)inData
{
//inData is the image data.
[inData retain];  
NSString *urlString = @"http://xyz.com/abcd/kgh.php";
NSURL* url = [NSURL URLWithString:urlString];

NSMutableData *photoData = [[NSMutableData alloc]init];

//SessionID is stored in NSUserDefaults
NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];

NSString * boundary = @"photoBoundaryParm";
NSString * boundaryString = [NSString stringWithFormat:@"--%@\r\n", boundary];
NSString * boundaryStringFinal = [NSString stringWithFormat:@"--%@--\r\n", boundary];

[photoData appendData:[boundaryString dataUsingEncoding:NSUTF8StringEncoding]];
[photoData appendData:[[NSString stringWithFormat:@"Content-Disposition: form-data; name=\"SessionID\"\r\n\r\n"] dataUsingEncoding:NSUTF8StringEncoding]];
[photoData appendData:[[NSString stringWithFormat:@"SessionID=%@",[defaults objectForKey:@"SessionID"]] dataUsingEncoding:NSUTF8StringEncoding]];
[photoData appendData:[[NSString stringWithFormat:@"\r\n"] dataUsingEncoding:NSUTF8StringEncoding]];

[photoData appendData:[boundaryString dataUsingEncoding:NSUTF8StringEncoding]];
[photoData appendData:[[NSString stringWithFormat:@"Content-Disposition: form-data; name=\"photo\";\r\nfilename=\"myphoto.png\"\r\nContent-Type: image/png\r\n\r\n"] dataUsingEncoding:NSUTF8StringEncoding]];
[photoData appendData:[@"Content-Type: application/octet-stream\r\n\r\n" dataUsingEncoding:NSUTF8StringEncoding]];
[photoData appendData:inData];
[photoData appendData:[[NSString stringWithFormat:@"\r\n"] dataUsingEncoding:NSUTF8StringEncoding]];

[photoData appendData:[boundaryStringFinal dataUsingEncoding:NSUTF8StringEncoding]];

NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:url];
[request setHTTPMethod:@"POST"];
[request setHTTPBody:photoData];

NSString* requestDataLengthString = [[NSString alloc] initWithFormat:@"%d", [photoData length]];

[request addValue:requestDataLengthString forHTTPHeaderField:@"Content-Length"];
[request addValue:[NSString stringWithFormat:@"multipart/form-data; boundary=%@", boundary] forHTTPHeaderField:@"Content-Type"];

NSURLConnection *connection = [[NSURLConnection alloc]initWithRequest:request delegate:self
                        startImmediately:NO];

[connection scheduleInRunLoop:[NSRunLoop mainRunLoop]
                      forMode:NSDefaultRunLoopMode];
[connection start];

[inData release];
inData = nil;
}

请帮忙。

我坚持了很长时间。

提前致谢。

【问题讨论】：

在您的连接委托方法中，您是否点击了成功回调？（如果它是失败的，请提供实际的错误，虽然从事情的声音来看它是成功的，只是没有发布图像 - 只是想先消除明显的问题！）
真的要手动吗？您是否考虑过尝试 AFNetworking（请参阅 stackoverflow.com/questions/15410689/…）
delgate 方法 didReceiveResponse、didReceiveData 和 connectionDidFinishLoading 被调用。但是没有调用 didFailWithError 。 @大卫多伊尔
我正在尝试创建一个框架，所以想尽可能地避免第三方。我最初使用 ASIHTTPRequest 并且工作正常。但是在将我的框架集成到其他应用程序的过程中，我遇到了其他问题，因此切换到上述方法。 @VadimYelagin
你检查了吗？ nthn.me/posts/2012/objc-multipart-forms.html为我工作。

标签： iphone ios nsurlconnection nsmutableurlrequest

【解决方案1】：

试试这段代码，然后在 post nsstring 中传递你的值

NSString* url=[NSString stringWithFormat:url];

NSMutableURLRequest *theRequest=[NSMutableURLRequest requestWithURL:[NSURLURLWithString:[url stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding]]
                                                        cachePolicy:NSURLRequestReloadIgnoringLocalCacheData
                                                    timeoutInterval:60.0];
//do post request for parameter passing
[theRequest setHTTPMethod:@"POST"];

NSString *post = [NSString stringWithFormat:@"&imageData=%@",postData];



NSData *postData = [post dataUsingEncoding:NSASCIIStringEncoding allowLossyConversion:YES];
NSString *postLength = [NSString stringWithFormat:@"%d",[postData length]];


[theRequest setValue:postLength forHTTPHeaderField:@"Content-Length"];
[theRequest setHTTPBody:postData];

[theRequest  setURL:[NSURL URLWithString:url]];

[theRequest setValue:@"application/x-www-form-urlencoded" forHTTPHeaderField:@"Current-Type"];

NSURLConnection  *serverConnectionObj = [[NSURLConnection alloc] initWithRequest:theRequest delegate:self];

【讨论】：

【解决方案2】：

这是一个类方法解决方案：

标题

//=========================
// POST FORM WITH IMG
//=========================
+ (NSData *)postToUrl:(NSURL*)url
                 form:(NSDictionary*)form
             andImage:(UIImage*)img
             imageKey:(NSString*)imageKey
                error:(NSError**)error
    returningResponse:(NSURLResponse**)response;

类方法：

#pragma mark -
#pragma mark POST FORM
//=========================
// POST FORM
//=========================
+(NSData *)postToUrl:(NSURL*)url form:(NSDictionary*)form andImage:(UIImage*)img imageKey:(NSString*)imageKey error:(NSError**)error returningResponse:(NSURLResponse**)response{
    NSLog(@"postToUrl:%@ Form:%@ andImage:%@ imageKey:%@",url,form,img,imageKey);
    NSString *boundary = @"iOS_iKANIMO_BOUNDARY_STRING";
    NSString *contentType = [NSString stringWithFormat:@"multipart/form-data; boundary=%@", boundary];
    NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:url];
    [request setHTTPMethod:@"POST"];
    [request addValue:contentType forHTTPHeaderField:@"Content-Type"];

    NSMutableData *body = [NSMutableData data];

    [body appendData:[[NSString stringWithFormat:@"\r\n--%@\r\n", boundary] dataUsingEncoding:NSUTF8StringEncoding]];
    [body appendData:[[NSString stringWithFormat:@"Content-Disposition: form-data; name=\"%@\"; filename=\"photo.png\"\r\n", imageKey] dataUsingEncoding:NSUTF8StringEncoding]];
    [body appendData:[@"Content-Type: application/octet-stream\r\n\r\n" dataUsingEncoding:NSUTF8StringEncoding]];
    [body appendData:[NSData dataWithData:UIImagePNGRepresentation(img)]];



    for (NSString*key in [form allKeys]) {
        NSLog(@"%@ - %@",key,[form objectForKey:key]);
        NSString *value = [form objectForKey:key];
        [body appendData:[[NSString stringWithFormat:@"\r\n--%@\r\n", boundary] dataUsingEncoding:NSUTF8StringEncoding]];
        [body appendData:[[NSString stringWithFormat:@"Content-Disposition: form-data; name=\"%@\"\r\n\r\n%@",key, value] dataUsingEncoding:NSUTF8StringEncoding]];
    }


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

    //Now all we need to do is make a connection to the server and send the request:
    [request setHTTPBody:body];
    return [NSURLConnection sendSynchronousRequest:request returningResponse:response error:error];
}

【讨论】：