上傳圖像從iPhone

Question

我想上傳從iPhone到Rails的圖像，其配置與Dragonfly gem. Rails的服務器（使用蜻蜓）問題是我不斷收到此錯誤：

Dragonfly::TempObject must be initialized with a String, a File, a Tempfile, another TempObject, or something that responds to .tempfile

不知這與從iPhone或其他地方發送的MIME類型有關。上傳從瀏覽器正常工作。我很感激任何關於在哪裏尋找問題根源的指導 - iPhone或服務器。

謝謝。

Answer 1

所以我也有這個問題，但是這是如何從iPhone上傳到rails網站。至於他們正在使用的寶石，可能存在一個問題，但是下面的代碼確實可以使用rails，因爲我不得不學習如何將圖像上傳到rails。下面是代碼

// create request 
NSMutableURLRequest *request = [[NSMutableURLRequest alloc] init];          
[request setCachePolicy:NSURLRequestReloadIgnoringLocalCacheData]; 
[request setHTTPShouldHandleCookies:NO]; 
[request setTimeoutInterval:30]; 
[request setHTTPMethod:@"POST"]; 

NSString *boundary = @"------WebKitFormBoundary4QuqLuM1cE5lMwCy"; 
// set Content-Type in HTTP header 
NSString *contentType = [NSString stringWithFormat:@"multipart/form-data; boundary=%@", boundary]; 
[request setValue:contentType forHTTPHeaderField: @"Content-Type"]; 

// post body 
NSMutableData *body = [NSMutableData data]; 

NSMutableDictionary *parameters = [[NSMutableDictionary alloc] initWithCapacity:11]; 
[parameters setValue:@」information」 forKey:@"Information"]; 

然後繼續前進，並添加所有的參數到您需要與發送請求字典。

// add params (all params are strings) 
for (NSString *param in parameters) { 
    [body appendData:[[NSString stringWithFormat:@"--%@\r\n", boundary] dataUsingEncoding:NSUTF8StringEncoding]]; 
    [body appendData:[[NSString stringWithFormat:@"Content-Disposition: form-data; name=\"%@\"\r\n\r\n", param] dataUsingEncoding:NSUTF8StringEncoding]]; 
    [body appendData:[[NSString stringWithFormat:@"%@\r\n", [parameters objectForKey:param]] dataUsingEncoding:NSUTF8StringEncoding]]; 
} 


//Compress the data 
NSString *FileParamConstant = @"image"; 
// add image data 
CGFloat compression = 0.9f; 
CGFloat maxCompression = 0.1f; 
int maxFileSize = 250*1024; 

NSData *imageData = [[NSData alloc] initWithContentsOfFile:imagePath]; 

while ([imageData length] > maxFileSize && compression > maxCompression) 
{ 
    compression -= 0.1; 
    imageData = UIImageJPEGRepresentation([UIImage imageNamed:imagePath], compression); 
} 
if (imageData) { 
    [body appendData:[[NSString stringWithFormat:@"--%@\r\n", boundary] dataUsingEncoding:NSUTF8StringEncoding]]; 
    [body appendData:[[NSString stringWithFormat:@"Content-Disposition: form-data; name=\"%@\"; filename=\"image.jpg\"\r\n", FileParamConstant] 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]]; 
} 

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

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

// set URL 
[request setURL:[NSURL URLWithString:[[URLLibrary sharedInstance] getCreateFeedURL]]]; 
NSURLResponse* response; 
NSError* error; 

[NSURLConnection sendAsynchronousRequest:request 
            queue:[NSOperationQueue mainQueue] 
         completionHandler:^(NSURLResponse *response, NSData *data, NSError *error) { 
          make gui changes saying things worked 
         }]; 

請注意，由於Web瀏覽器的工作方式，圖像需要臨時寫入文件系統。這就是你如何從iPhone上傳圖像到軌道站點。