I have next to no knowledge of Objective-C, but I'm using Cordova (PhoneGap) to create a web app and needed to manipulate the headers sent by their InAppBrowser plugin.
I have managed to get custom headers to send with the request, I changed the NSURLRequest to a NSMutableURLRequest and then set a custom header like this:
NSMutableURLRequest* request = [NSMutableURLRequest requestWithURL:url];
[request setValue:#"test" forHTTPHeaderField:#"Accept-Encoding"];
My next problem was passing the headers from the javascript. I added an additional option to the parameters. The parameters need to be passed along between several functions (or methods?) before they get to the place where I can manipulate the headers. I've managed to pass them through several functions, and NSLog is still showing me the correct value that I sent from my javascript, but I've fallen at the final hurdle. I can't pass an additional parameter to my final function!
I have this bit of code here:
[self.inAppBrowserViewController navigateTo:url withHeaders:headers ];
Which calls the navigateTo function that is defined like this:
- (void)navigateTo:(NSURL*)url withHeaders:(NSString*)headers
{
NSMutableURLRequest* request = [NSMutableURLRequest requestWithURL:url];
[request setValue:#"test" forHTTPHeaderField:#"Accept-Encoding"];
if (_userAgentLockToken != 0) {
[self.webView loadRequest:request];
} else {
[CDVUserAgentUtil acquireLock:^(NSInteger lockToken) {
_userAgentLockToken = lockToken;
[CDVUserAgentUtil setUserAgent:_userAgent lockToken:lockToken];
[self.webView loadRequest:request];
}];
}
}
The problem I have is that the line that calls navigateTo is giving me the error: "CordovaLib/Classes/CDVInAppBrowser.m:149:6: No visible #interface for 'CDVInAppBrowserViewController' declares the selector 'navigateTo:withHeaders:'"
Declare the method in CDVInAppBrowserViewController.h as
- (void)navigateTo:(NSURL*)url withHeaders:(NSString*)headers;
Related
I'm trying to use an ASIFormDataRequest in my iPhone application to send a video I have just recorded to a server, along with a string that I can use to ID who the video belongs to. The code for doing so is here:
-(void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info {
NSURL *urlvideo = [info objectForKey:UIImagePickerControllerMediaURL];
NSString *urlString=[urlvideo path];
NSLog(#"urlString=%#",urlString);
NSString *str = [NSString stringWithFormat:#"http://www.mysite.com/videodata.php"];
NSURL *url = [NSURL URLWithString:[str stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding]];
ASIFormDataRequest *request = [ASIFormDataRequest requestWithURL:url];
NSData *patientData = [_patientCode dataUsingEncoding:NSUTF8StringEncoding];
[request setFile:urlString forKey:#"video"];
[request setData:patientData forKey:#"patientcode"];
[request setRequestMethod:#"POST"];
[request setDelegate:self];
[request startSynchronous];
NSLog(#"responseStatusCode: %i",[request responseStatusCode]);
NSLog(#"responseString: %#",[request responseString]);
[picker dismissViewControllerAnimated:YES completion:nil];
}
Everything seems to work correctly, I get back a status code of 200 and the method finishes as expected. However, nothing seems to be received by the php file on the server. I added this line to my server-side php code:
echo(count($_POST));
This returns 0, so it seems as though nothing is actually getting posted by the ASIFormDataRequest. I feel like there might be some simple step I am missing as I have never used the ASIFormDataRequest before, but any help would be greatly appreciated.
EDIT: I changed the setData:patientData to setPostValue:_patientCode and now that part of the post is getting sent correctly, so it seems as though setPostValue works but setData and setFile do not.
You should use -addData:forKey: and -addFile:forKey: instead of -setData:forKey: and -setFile:forKey:.
Other than that, check the debug output when you compile with DEBUG_FORM_DATA_REQUEST.
You should be sending a multipart/form-data request when using -addFile:forKey: and a application/x-www-form-urlencoded request when using -addPostValue:forKey:.
Does your server handle multipart/form-data requests?
I ended up finding the answer while reading something else and noticing that they did something interesting: The file I uploaded was simply going into the $_FILES array, not the $_POST array. I also changed [request setData:patientData forKey:#"patientcode"]; to [request setPostValue:_patientCode forKey:#"patientCode"]; and then that appeared in the $_POST array as I wanted so I was able to get both the string I was sending and the file I was sending in my php script.
I would like to send a file asynchronously to the server; however, it seems like when I do send the request to the server. The server gives me a HTTP code: 200, which is OK but no file is being uploaded to the server.
However, when I leave it to synchronous... it works perfectly. Weird..
Any ideas would be greatly appreciated,
- (void) sendCSVtoServer: ( Session * ) archive_session {
NSLog(#"file name: %#", [archive_session getFile]);
NSURL *url = [NSURL URLWithString:#"http://xx.x.xxx.xxx:3000/xxx/xxxxxxxx"];
ASIFormDataRequest *request = [ASIFormDataRequest requestWithURL:url];
[request setPostValue: [archive_session getEmail] forKey:#"email"];
[request addFile: [archive_session getFile] forKey:#"csv"];
[request setDelegate:self];
[request startSynchronous];
}
Thanks!
You are setting a delegate, but you mention you did not implement any of those methods. ASIFormDataRequest extends ASIHTTPResquest, and therefore inherits all its properties.
You will have to implement methods decalred in ASIHTTPRequestDelegate, at least
- (void)requestFinished:(ASIHTTPRequest *)request;
and
- (void)requestFailed:(ASIHTTPRequest *)request;
Maybe others depending on your needs.
Your upload is probably still working (can you check your server?), but, when you send the request asynchronously, you don't have any way to determine if the request has succeeded or failed; right now you are just sedning and forgetting.
All the methods declared in ASIHTTPRequestDelegate.h are marked as optional, which is why the debugger, compiler, and runtime is not complaining.
How to access the (POST)data sent with the request from the requestFailed/requestFinished function.
- (void) abc {
NSString *postString = #"john";
NSURL *url = [NSURL URLWithString:#"http://abc.com"];
ASIHTTPRequest *request = [ASIHTTPRequest requestWithURL:url];
[request setPostValue:postString forKey:#"name"];
[request setDelegate:self];
[request startAsynchronus];
}
- (void) requestFinished:(ASIHTTPRequest *)request
{
// Question is whether the request holds the sent post values.
// If it holds. how can we access them.
// i tried using [request valueForKey:#"name"];
// but it won't work.
}
Handling success and failure for multiple requests in delegate methods
If you need to handle success and failure on many different types of
request, you have several options:
If your requests are all of the same broad type, but you want to
distinguish between them, you can set the userInfo NSDictionary
property of each request with your own custom data that you can read
in your finished / failed delegate methods. For simpler cases, you can
set the request’s tag property instead. Both of these properties are
for your own use, and are not sent to the server.
If you need to handle success and failure in a completely different way for each
request, set a different setDidFinishSelector / setDidFailSelector for
each request For more complex situations, or where you want to parse
the response in the background, create a minimal subclass of
ASIHTTPRequest for each type of request, and override requestFinished:
and failWithError:.
That provided me a good solution to handle different requests.
You could try this -
- (void)requestFinished:(ASIHTTPRequest *)request {
NSLog(#"Response %d ==> %#", request.responseStatusCode, [request responseString]);
}
You can also handle other methods if you choose, such as:
- (void)requestStarted:(ASIHTTPRequest *)request;
- (void)requestFailed:(ASIHTTPRequest *)request;
The docs are located at http://allseeing-i.com/ASIHTTPRequest/ and are fantastic.
You can cast your request into a ASIFormDataRequest:
if ([request isKindOfClass:[ASIFormDataRequest class]]) {
ASIFormDataRequest *requestWithPostDatas = (ASIFormDataRequest *)request;
NSArray *myPostData = [requestWithPostDatas getPostData];
}
You will also have to make "postData" accessible with a "getPostData" public function in ASIFormDataRequest.
Whenever I do a curl call using the below code:
NSURL *url = [NSURL URLWithString:requestURL];
NSURLRequest *request = [NSURLRequest requestWithURL:url
cachePolicy:NSURLRequestReloadIgnoringLocalCacheData
timeoutInterval:30];
if (connectionInProgress) {
[connectionInProgress cancel];
}
connectionInProgress = [[NSURLConnection alloc]initWithRequest:request delegate:self startImmediately:YES];
connectionDidFinishLoading is my final destination where I can manipulate the response data and call my next methods to continue with the app . If I hard-code some specific tasks like
-(void)connectionDidFinishLoading:(NSURLConnection *)connection
{
NSXMLParser *parser = [[NSXMLParser alloc] initWithData:xmlData];
[parser setDelegate:self];
[parser parse];
[someLabel setText:parsedTextFromXMLData];
}
If I need to do another curl call to a different address, wouldn't someLabel setText always get re-set again? Is there a way to make this delegate function behave differently on each curl call? (btw, is connectionDidFinishLoading usually the right place to put the next step of codes?) If so then wouldn't it always get called again by the next curl call?
Have a look at this S.O. post for a recipe concerning NSURLConnection and multiple requests.The suggestion is doing something like this:
- (void)connectionDidFinishLoading:(NSURLConnection *)connection {
if (connection == firstConnection) {
// do something
}
else if (connection == secondConnection) {
// do something else
}
}
EDIT: the idea here is that connectionDidFinishLoading is a method of your own delegate (so you write it). In the delegate, you store the address of each connection you create; then, when the connection comes back with the data, you tell which connection it is by comparing its address to the one you stored in the delegate. -END EDIT
Another option you have is using the ASIHTTPRequest framework, which offers a request-based (as opposed to connection-based) delegation mechanism, so each request has got a delegate object to handle the result; or, in other words, the delegate receives a reference to the request, so you can easily tell which request result you are handling.
ASIHTTPRequest offers a bunch of advantages over NSURLConnection. You can read about them in this S.O. post.
There're 2 options to do this:
you can implement a separate class, that will be responsible for handling NSURLConnection delegate stuff and create a separate instance for each request
you can use NSObject key-value methods on NSURLConnection instance for setting up some tag, that will be checked in connectionDidFinishLoading: method
For me, option 1 will be a better approach
I've recently started trying to implement HTTP upload support to a program, but I've been having some difficulty doing so. This is the first time I've ever used objective-c (although I have a C background), so I'm still very new to the language. I've been trying to get it to work using the HTTPRequest library, but haven't been able to get anything to start working. It's a fairly large program (2500~ lines) so I won't paste it here. I'll just paste the function itself here.
- (void)Upload2HTTP2:(NSString *)ZipPath
{
[self UpdateProgressBar:#"Upload2HTTP opening Connection to Website..."];
NSLog(#"Upload2HTTP called\n");
//URL to be used to upload
NSURL *url = [NSURL URLWithString:#"http://ftp.website.com"];
NSLog(#"Upload2HTTP -%#\n",url);
//Creates the new ASIFormDataRequest object to do the uploading
//Uses the ASIHTTPRequest and ASIFormDataRequest libraries
// http://allseeing-i.com/ASIHTTPRequest/ for more information
ASIFormDataRequest *request = [ASIFormDataRequest requestWithURL:url];
[request addRequestHeader:#"Referer" value:#"http://ftp.website.com"];
//Sets the authentication information
//This should have already been retrieved in RetrieveFromBrowser
[request setUsername:RespUID];
[request setPassword:RespPWD];
//Sets the file to be uploaded
[request setFile:ZipPath forKey:#"Customer Upload"];
//Starts the transfer?
[request startAsynchronous];
}
ZipPath, RespUID, and RespPWD are all set in another area of the program. Basically, I've got the username/PW for the HTTP authentication, and the path to the file I want to upload, but I've very little experience with the language and this library, so I'm a bit lost. I can't give any specific errors or reasons as to why it hangs, I just know that after I click upload in the program, it runs through this function, and the program hangs trying to upload the file. Is there anything I'm missing or doing wrong in this function? I'd really appreciate any help you guys could lend.
Thanks :)
ASIHTTPRequest's asynchronous networking takes advantage of the delegate design pattern. Setting the request's delegate property to self, having that class adhere to the ASIHTTPRequestDelegate protocol, and implementing - (void)requestDidFinish: and - (void)requestdidFail: should give you callbacks for finish and failure. Quick example:
- (void)Upload2HTTP2:(NSString *)ZipPath
{
...
request.delegate = self;
[request startAsynchronous];
}
- (void)requestDidFinish:(ASIHTTPRequest *)request
{
NSLog(#"Success! Do stuff here with [request responseData] or [request responseString]");
}
- (void)requestDidFail:(ASIHTTPRequest *)request
{
NSLog(#"Failure! Check out [request error] for details");
}