所以我也遇到了这个问题,不过这是如何从iPhone上传到Rails网站的方法。至于他们使用的gem可能会有问题,但下面的代码确实适用于Rails,因为我也曾经学习过如何上传图片到Rails。以下是代码:
NSMutableURLRequest *request = [[NSMutableURLRequest alloc] init];
[request setCachePolicy:NSURLRequestReloadIgnoringLocalCacheData];
[request setHTTPShouldHandleCookies:NO];
[request setTimeoutInterval:30];
[request setHTTPMethod:@"POST"];
NSString *boundary = @"------WebKitFormBoundary4QuqLuM1cE5lMwCy";
NSString *contentType = [NSString stringWithFormat:@"multipart/form-data; boundary=%@", boundary];
[request setValue:contentType forHTTPHeaderField: @"Content-Type"];
NSMutableData *body = [NSMutableData data];
NSMutableDictionary *parameters = [[NSMutableDictionary alloc] initWithCapacity:11];
[parameters setValue:@”information” forKey:@"Information"];
然后,继续将需要与请求一起发送的所有参数添加到字典中。
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]];
}
NSString *FileParamConstant = @"image";
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]];
[request setHTTPBody:body];
[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
}];
请注意,由于Web浏览器的工作方式,图像需要暂时写入文件系统。这是如何通过iPhone将图像上传到Rails网站的方法。