Upload multiple photos on Facebook using Batch Request - iphone

Question

I had done following code with reference to following link to create batch request for uploading multiple photos in Facebook.
I had got some solution for uploading multiple photos on Facebook through this Facebook graph API.
CODE:
NSString *jsonRequest1 = #"{ \"method\": \"POST\", \"relative_url\": \"me/photos\" , \"body\": \"Hello 1\", \"attached_files\": \"file1\" }";
NSString *jsonRequest2 = #"{ \"method\": \"POST\", \"relative_url\": \"me/photos\" , \"body\": \"Hello 2\", \"attached_files\": \"file2\" }";
NSString *jsonRequestsArray = [NSString stringWithFormat:#"[ %#, %# ]", jsonRequest1, jsonRequest2];
NSMutableDictionary *params = [NSMutableDictionary dictionaryWithObjectsAndKeys:jsonRequestsArray,#"batch",nil];
[params setObject:UIImagePNGRepresentation(self.image1) forKey:#"file1"];
[params setObject:UIImagePNGRepresentation(self.image2) forKey:#"file2"];
[objFacebook requestWithGraphPath:#"me" andParams:params andHttpMethod:#"POST" andDelegate:self];
Now when I am running this code I got the following output.
Result Dictionary in - (void)request:(FBRequest *)request didLoad:(id)result
(
{
body = "{\"error\":0,\"error_description\":\"File file1 has not been attached\"}";
code = 400;
headers = (
{
name = "HTTP/1.1";
value = "400 Bad Request";
},
{
name = "Content-Type";
value = "text/javascript; charset=UTF-8";
}
);
},
{
body = "{\"error\":0,\"error_description\":\"File file2 has not been attached\"}";
code = 400;
headers = (
{
name = "HTTP/1.1";
value = "400 Bad Request";
},
{
name = "Content-Type";
value = "text/javascript; charset=UTF-8";
}
);
}
)
I don't know how this files attached.. Can anyone help me to figure out this problem.
Is there any change in my code then please let me know.
Thanks in advance...

Answer 1

I recommend you use the new integrated Facebook API's in iOS 6 to do this instead of Facebook's API: https://developer.apple.com/videos/wwdc/2012/?id=306 there's a golden WWDC video for all social tasks. Plus using the new API's in iOS 6 is MUCH faster then using Facebooks.

Answer 2

For your NSDictionary of parameters ,use the NSData representation, instead of directly using the UIImage object.
Depending on the compression format of the images you are trying to upload, you'll need to use a different method to convert the UIImage to NSData. Here are two techniques, one for PNG and one for JPEG
//...cut...
[params setObject:UIImageJPEGRepresentation(self.jpegImage, 0.8) forKey:#"file1"];
[params setObject:UIImagePNGRepresentation(self.pngImage) forKey:#"file2"];
//...cut...
This is a tutorial from the Facebook Developer blog that shows something similar (although it is for a video, and not the batch API), and one significant difference from your code is that the parameter passed is in NSData representation, not UIImage.
http://developers.facebook.com/blog/post/532/

Answer 3

[params setObject:UIImagePNGRepresentation(self.image1) forKey:#"file1"];
This should not be the data, it should be the path for that images. It will work fine if you provide a path instead of NSData.

Answer 4

I got the solution for multiple file upload using FBgraph.
here is my code.
-(void) fbGraphCallback
{
FbGraphFile *graph_file = [[FbGraphFile alloc]initWithImage:imgView1.image];
FbGraphFile *graph_file1 = [[FbGraphFile alloc]initWithImage:imgView2.image];
NSString *jsonRequest1 = #"{ \"method\": \"POST\", \"relative_url\": \"me/photos\" , \"body\": \"First Image\", \"attached_files\": \"file1\" }";
NSString *jsonRequest2 = #"{ \"method\": \"POST\", \"relative_url\": \"me/photos\" , \"body\": \"Second Image\", \"attached_files\": \"file2\" }";
NSString *jsonRequestsArray = [NSString stringWithFormat:#"[ %#, %# ]", jsonRequest1, jsonRequest2];
NSMutableDictionary *params = [NSMutableDictionary dictionaryWithObjectsAndKeys:jsonRequestsArray,#"batch",nil];
[params setObject:graph_file forKey:#"file1"];
[params setObject:graph_file1 forKey:#"file2"];
[fbgraph doGraphPost:#"" withPostVars:params];
}
Thanks mehul.

Answer 5

You are adding the binary to the Dictionary incorrectly. Take a look at the file upload method in Facebook's sample app. You should be able to easily adopt Facebook's sample code to your app.
/**
* Upload a photo.
*/
-(IBAction)uploadPhoto:(id)sender
{
NSString *path = #"http://www.facebook.com/images/devsite/iphone_connect_btn.jpg";
NSURL *url = [NSURL URLWithString:path];
NSData *data = [NSData dataWithContentsOfURL:url];
UIImage *img = [[UIImage alloc] initWithData:data];
NSMutableDictionary *params = [NSMutableDictionary dictionaryWithObjectsAndKeys:
img, #"picture",
nil];
[_facebook requestWithMethodName:#"photos.upload"
andParams:params
andHttpMethod:#"POST"
andDelegate:self];
[img release];
}