File Upload to HTTP server in iphone programming

问题:

Can anyone provide me some links or examples to upload files to the HTTP server using iphone APIs.

回答1:

The code below uses HTTP POST to post NSData to a webserver. You also need minor knowledge of PHP.

NSString *urlString = @\"http://yourserver.com/upload.php\";
NSString *filename = @\"filename\";
request= [[[NSMutableURLRequest alloc] init] autorelease];
[request setURL:[NSURL URLWithString:urlString]];
[request setHTTPMethod:@\"POST\"];
NSString *boundary = @\"---------------------------14737809831466499882746641449\";
NSString *contentType = [NSString stringWithFormat:@\"multipart/form-data; boundary=%@\",boundary];
[request addValue:contentType forHTTPHeaderField: @\"Content-Type\"];
NSMutableData *postbody = [NSMutableData data];
[postbody appendData:[[NSString stringWithFormat:@\"\\r\\n--%@\\r\\n\",boundary] dataUsingEncoding:NSUTF8StringEncoding]];
[postbody appendData:[[NSString stringWithFormat:@\"Content-Disposition: form-data; name=\\\"userfile\\\"; filename=\\\"%@.jpg\\\"\\r\\n\", filename] dataUsingEncoding:NSUTF8StringEncoding]];
[postbody appendData:[[NSString stringWithString:@\"Content-Type: application/octet-stream\\r\\n\\r\\n\"] dataUsingEncoding:NSUTF8StringEncoding]];
[postbody appendData:[NSData dataWithData:YOUR_NSDATA_HERE]];
[postbody appendData:[[NSString stringWithFormat:@\"\\r\\n--%@--\\r\\n\",boundary] dataUsingEncoding:NSUTF8StringEncoding]];
[request setHTTPBody:postbody];

NSData *returnData = [NSURLConnection sendSynchronousRequest:request returningResponse:nil error:nil];
returnString = [[NSString alloc] initWithData:returnData encoding:NSUTF8StringEncoding];
NSLog(@\"%@\", returnString);

回答2:

ASIHTTPRequest is a great wrapper around the network APIs and makes it very easy to upload a file. Here\'s their example (but you can do this on the iPhone too - we save images to \"disk\" and later upload them.

ASIFormDataRequest *request = [[[ASIFormDataRequest alloc] initWithURL:url] autorelease];
[request setPostValue:@\"Ben\" forKey:@\"first_name\"];
[request setPostValue:@\"Copsey\" forKey:@\"last_name\"];
[request setFile:@\"/Users/ben/Desktop/ben.jpg\" forKey:@\"photo\"];

回答3:

I used ASIHTTPRequest a lot like Jane Sales answer but it is not under development anymore and the author suggests using other libraries like AFNetworking.

Honestly, I think now is the time to start looking elsewhere.

AFNetworking works great, and let you work with blocks a lot (which is a great relief).

Here\'s an image upload example from their documentation page on github:

NSURL *url = [NSURL URLWithString:@\"http://api-base-url.com\"];
AFHTTPClient *httpClient = [[AFHTTPClient alloc] initWithBaseURL:url];
NSData *imageData = UIImageJPEGRepresentation([UIImage imageNamed:@\"avatar.jpg\"], 0.5);
NSMutableURLRequest *request = [httpClient multipartFormRequestWithMethod:@\"POST\" path:@\"/upload\" parameters:nil constructingBodyWithBlock: ^(id <AFMultipartFormData>formData) {
    [formData appendPartWithFileData:imageData name:@\"avatar\" fileName:@\"avatar.jpg\" mimeType:@\"image/jpeg\"];
}];

AFHTTPRequestOperation *operation = [[AFHTTPRequestOperation alloc] initWithRequest:request];
[operation setUploadProgressBlock:^(NSUInteger bytesWritten, long long totalBytesWritten, long long totalBytesExpectedToWrite) {
    NSLog(@\"Sent %lld of %lld bytes\", totalBytesWritten, totalBytesExpectedToWrite);
}];
[httpClient enqueueHTTPRequestOperation:operation];

回答4:

This is a great wrapper, but when posting to a asp.net web page, two additional post values need to be set:

    ASIFormDataRequest *request = [ASIFormDataRequest requestWithURL:url];
    //ADD THESE, BECAUSE ASP.NET is Expecting them for validation
    //Even if they are empty you will be able to post the file
    [request setPostValue:@\"\" forKey:@\"__VIEWSTATE\"];
    [request setPostValue:@\"\" forKey:@\"__EVENTVALIDATION\"]; 
    ///

    [request setFile:FIleName forKey:@\"fileupload_control_Name\"];
    [request startSynchronous];

回答5:

Try this.. very easy to understand & implementation...

You can download sample code directly here https://github.com/Tech-Dev-Mobile/Json-Sample

- (void)simpleJsonParsingPostMetod
{

#warning set webservice url and parse POST method in JSON
    //-- Temp Initialized variables
    NSString *first_name;
    NSString *image_name;
    NSData *imageData;

    //-- Convert string into URL
    NSString *urlString = [NSString stringWithFormat:@\"demo.com/your_server_db_name/service/link\"];
    NSMutableURLRequest *request =[[NSMutableURLRequest alloc] init];
    [request setURL:[NSURL URLWithString:urlString]];
    [request setHTTPMethod:@\"POST\"];

    NSString *boundary = @\"14737809831466499882746641449\";
    NSString *contentType = [NSString stringWithFormat:@\"multipart/form-data; boundary=%@\",boundary];
    [request addValue:contentType forHTTPHeaderField: @\"Content-Type\"];

    //-- Append data into posr url using following method
    NSMutableData *body = [NSMutableData data];


    //-- For Sending text

        //-- \"firstname\" is keyword form service
        //-- \"first_name\" is the text which we have to send
    [body appendData:[[NSString stringWithFormat:@\"\\r\\n--%@\\r\\n\",boundary] dataUsingEncoding:NSUTF8StringEncoding]];
    [body appendData:[[NSString stringWithFormat:@\"Content-Disposition: form-data; name=\\\"%@\\\"\\r\\n\\r\\n\",@\"firstname\"] dataUsingEncoding:NSUTF8StringEncoding]];
    [body appendData:[[NSString stringWithFormat:@\"%@\",first_name] dataUsingEncoding:NSUTF8StringEncoding]];


    //-- For sending image into service if needed (send image as imagedata)

        //-- \"image_name\" is file name of the image (we can set custom name)
    [body appendData:[[NSString stringWithFormat:@\"\\r\\n--%@\\r\\n\",boundary] dataUsingEncoding:NSUTF8StringEncoding]];

    [body appendData:[[NSString stringWithFormat:@\"Content-Disposition:form-data; name=\\\"file\\\"; filename=\\\"%@\\\"\\r\\n\",image_name] dataUsingEncoding:NSUTF8StringEncoding]];
    [body appendData:[@\"Content-Type: application/octet-stream\\r\\n\\r\\n\" dataUsingEncoding:NSUTF8StringEncoding]];
    [body appendData:[NSData dataWithData:imageData]];
    [body appendData:[[NSString stringWithFormat:@\"\\r\\n--%@--\\r\\n\",boundary] dataUsingEncoding:NSUTF8StringEncoding]];


    //-- Sending data into server through URL
    [request setHTTPBody:body];

    //-- Getting response form server
    NSData *responseData = [NSURLConnection sendSynchronousRequest:request returningResponse:nil error:nil];

    //-- JSON Parsing with response data
    NSDictionary *result = [NSJSONSerialization JSONObjectWithData:responseData options:NSJSONReadingMutableContainers error:nil];
    NSLog(@\"Result = %@\",result);
}

回答6:

This isn\'t an alternative solution; rather a suggestion for Brandon\'s popular answer (seeing as though I don\'t have enough rep to comment on that answer). If you\'re uploading large files; you\'re probably going to get a mmap malloc exception on account of having to read the file into memory to post it to your server.

You can tweak Brandon\'s code by replacing:

[request setHTTPBody:postbody];

With:

NSInputStream *stream = [[NSInputStream alloc] initWithData:postbody];
[request setHTTPBodyStream:stream];

回答7:

I thought I would add some server side php code to this answer for any beginners that read this post and are struggling to figure out how to receive the file on the server side and save the file to the filesystem.

I realize that this answer does not directly answer the OP\'s question, but since Brandon\'s answer is sufficient for the iOS device side of uploading and he mentions that some knowledge of php is necessary, I thought I would fill in the php gap with this answer.

Here is a class I put together with some sample usage code. Note that the files are stored in directories based on which user is uploading them. This may or may not be applicable to your use, but I thought I\'d leave it in place just in case.

<?php


class upload
{
    protected $user;

    protected $isImage;
    protected $isMovie;

    protected $file;
    protected $uploadFilename;
    protected $uploadDirectory;
    protected $fileSize;
    protected $fileTmpName;
    protected $fileType;
    protected $fileExtension;

    protected $saveFilePath;

    protected $allowedExtensions;

function __construct($file, $userPointer)
{
    // set the file we\'re uploading
    $this->file = $file;

    // if this is tied to a user, link the user account here
    $this->user = $userPointer;

    // set default bool values to false since we don\'t know what file type is being uploaded yet
    $this->isImage   = FALSE;
    $this->isMovie   = FALSE;

    // setup file properties
    if (isset($this->file) && !empty($this->file))
    {   
        $this->uploadFilename   = $this->file[\'file\'][\'name\'];
        $this->fileSize         = $this->file[\'file\'][\'size\'];
        $this->fileTmpName      = $this->file[\'file\'][\'tmp_name\'];
        $this->fileType         = $this->file[\'file\'][\'type\'];
    }
    else
    {
        throw new Exception(\'Received empty data. No file found to upload.\');
    }

    // get the file extension of the file we\'re trying to upload
    $tmp = explode(\'.\', $this->uploadFilename);
    $this->fileExtension        = strtolower(end($tmp));

}



public function image($postParams)
{
    // set default error alert (or whatever you want to return if error)
    $retVal = array(\'alert\' => \'115\');

    // set our bool
    $this->isImage = TRUE;

    // set our type limits
    $this->allowedExtensions    = array(\"png\");

    // setup destination directory path (without filename yet)
    $this->uploadDirectory      = DIR_IMG_UPLOADS.$this->user->uid.\"/photos/\";

    // if user is not subscribed they are allowed only one image, clear their folder here
    if ($this->user->isSubscribed() == FALSE)
    {
        $this->clearFolder($this->uploadDirectory);
    }

    // try to upload the file
    $success = $this->startUpload();

    if ($success === TRUE)
    {
        // return the image name (NOTE: this wipes the error alert set above)
        $retVal = array(
                        \'imageName\' =>  $this->uploadFilename,
                        );
    }

    return $retVal;
}



public function movie($data)
{
    // update php settings to handle larger uploads
    set_time_limit(300);

    // you may need to increase allowed filesize as well if your server is not set with a high enough limit

    // set default return value (error code for upload failed)
    $retVal = array(\'alert\' => \'92\');

    // set our bool
    $this->isMovie = TRUE;

    // set our allowed movie types
    $this->allowedExtensions = array(\"mov\", \"mp4\", \"mpv\", \"3gp\");

    // setup destination path
    $this->uploadDirectory = DIR_IMG_UPLOADS.$this->user->uid.\"/movies/\";

    // only upload the movie if the user is a subscriber
    if ($this->user->isSubscribed())
    {
        // try to upload the file
        $success = $this->startUpload();

        if ($success === TRUE)
        {
            // file uploaded so set the new retval
            $retVal = array(\'movieName\' => $this->uploadFilename);
        }
    }
    else
    {
        // return an error code so user knows this is a limited access feature
        $retVal = array(\'alert\' => \'13\');
    }

    return $retVal;
}




//-------------------------------------------------------------------------------
//                          Upload Process Methods
//-------------------------------------------------------------------------------

private function startUpload()
{
    // see if there are any errors
    $this->checkForUploadErrors();

    // validate the type received is correct
    $this->checkFileExtension();

    // check the filesize
    $this->checkFileSize();

    // create the directory for the user if it does not exist
    $this->createUserDirectoryIfNotExists();

    // generate a local file name
    $this->createLocalFileName();

    // verify that the file is an uploaded file
    $this->verifyIsUploadedFile();

    // save the image to the appropriate folder
    $success = $this->saveFileToDisk();

    // return TRUE/FALSE
    return $success;
}

private function checkForUploadErrors()
{
    if ($this->file[\'file\'][\'error\'] != 0)
    {
        throw new Exception($this->file[\'file\'][\'error\']);
    }
}

private function checkFileExtension()
{
    if ($this->isImage)
    {
        // check if we are in fact uploading a png image, if not return error
        if (!(in_array($this->fileExtension, $this->allowedExtensions)) || $this->fileType != \'image/png\' || exif_imagetype($this->fileTmpName) != IMAGETYPE_PNG)
        {
            throw new Exception(\'Unsupported image type. The image must be of type png.\');
        }
    }
    else if ($this->isMovie)
    {
        // check if we are in fact uploading an accepted movie type
        if (!(in_array($this->fileExtension, $this->allowedExtensions)) || $this->fileType != \'video/mov\')
        {
            throw new Exception(\'Unsupported movie type. Accepted movie types are .mov, .mp4, .mpv, or .3gp\');
        }
    }   
}

private function checkFileSize()
{
    if ($this->isImage)
    {
        if($this->fileSize > TenMB)
        {
            throw new Exception(\'The image filesize must be under 10MB.\');
        }
    }
    else if ($this->isMovie)
    {
        if($this->fileSize > TwentyFiveMB) 
        {
            throw new Exception(\'The movie filesize must be under 25MB.\');
        }
    }
}

private function createUserDirectoryIfNotExists()
{
    if (!file_exists($this->uploadDirectory)) 
    {
        mkdir($this->uploadDirectory, 0755, true);
    }
    else
    {
        if ($this->isMovie)
        {
            // clear any prior uploads from the directory (only one movie file per user)
            $this->clearFolder($this->uploadDirectory);
        }
    }
}

private function createLocalFileName()
{
    $now = time();

    // try to create a unique filename for this users file
    while(file_exists($this->uploadFilename = $now.\'-\'.$this->uid.\'.\'.$this->fileExtension))
    {
        $now++;
    }

    // create our full file save path
    $this->saveFilePath = $this->uploadDirectory.$this->uploadFilename;
}

private function clearFolder($path)
{
    if(is_file($path))
    {
        // if there\'s already a file with this name clear it first
        return @unlink($path);
    }
    elseif(is_dir($path))
    {
        // if it\'s a directory, clear it\'s contents
        $scan = glob(rtrim($path,\'/\').\'/*\');
        foreach($scan as $index=>$npath)
        {
            $this->clearFolder($npath);
            @rmdir($npath);
        }
    }
}

private function verifyIsUploadedFile()
{
    if (! is_uploaded_file($this->file[\'file\'][\'tmp_name\']))
    {
        throw new Exception(\'The file failed to upload.\');
    }
}


private function saveFileToDisk()
{
    if (move_uploaded_file($this->file[\'file\'][\'tmp_name\'], $this->saveFilePath))
    {
        return TRUE;     
    }

    throw new Exception(\'File failed to upload. Please retry.\');
}

}


?>

Here\'s some sample code demonstrating how you might use the upload class...

// get a reference to your user object if applicable
$myUser = $this->someMethodThatFetchesUserWithId($myUserId);

// get reference to file to upload
$myFile = isset($_FILES) ? $_FILES : NULL;

// use try catch to return an error for any exceptions thrown in the upload script
try 
{
    // create and setup upload class
    $upload = new upload($myFile, $myUser);

    // trigger file upload
    $data   = $upload->image();     // if uploading an image
    $data  = $upload->movie();      // if uploading movie

    // return any status messages as json string
    echo json_encode($data);
} 
catch (Exception $exception) 
{
    $retData = array(
            \'status\'    => \'FALSE\',
            \'payload\'   => array(
                            \'errorMsg\' => $exception->getMessage()
                            ),
                );

    echo json_encode($retData);
}

回答8:

I have made a lightweight backup method for the Mobile-AppSales app available at github

I wrote about it here http://memention.com/blog/2009/11/22/Lightweight-backup.html

Look for the - (void)startUpload method in ReportManager.m

回答9:

An update to @Brandon\'s answer, generalized to a method

- (NSString*) postToUrl:(NSString*)urlString data:(NSData*)dataToSend withFilename:(NSString*)filename
{
    NSMutableURLRequest *request= [[NSMutableURLRequest alloc] init];
    [request setURL:[NSURL URLWithString:urlString]];
    [request setHTTPMethod:@\"POST\"];
    NSString *boundary = @\"---------------------------14737809831466499882746641449\";
    NSString *contentType = [NSString stringWithFormat:@\"multipart/form-data; boundary=%@\", boundary];
    [request addValue:contentType forHTTPHeaderField: @\"Content-Type\"];
    NSMutableData *postbody = [NSMutableData data];
    [postbody appendData:[[NSString stringWithFormat:@\"\\r\\n--%@\\r\\n\", boundary] dataUsingEncoding:NSUTF8StringEncoding]];
    [postbody appendData:[[NSString stringWithFormat:@\"Content-Disposition: form-data; name=\\\"userfile\\\"; filename=\\\"%@\\\"\\r\\n\", filename] dataUsingEncoding:NSUTF8StringEncoding]];
    [postbody appendData:[@\"Content-Type: application/octet-stream\\r\\n\\r\\n\" dataUsingEncoding:NSUTF8StringEncoding]];
    [postbody appendData:[NSData dataWithData:dataToSend]];
    [postbody appendData:[[NSString stringWithFormat:@\"\\r\\n--%@--\\r\\n\", boundary] dataUsingEncoding:NSUTF8StringEncoding]];
    [request setHTTPBody:postbody];

    NSError* error;
    NSData *returnData = [NSURLConnection sendSynchronousRequest:request returningResponse:nil error:&error];
    if (returnData) {
        return [[NSString alloc] initWithData:returnData encoding:NSUTF8StringEncoding];
    }
    else {
        return nil;
    }
}

Invoke like so, sending data from a string:

[self postToUrl:@\"<#Your url string#>\"
           data:[@\"<#Your string to send#>\" dataUsingEncoding:NSUTF8StringEncoding]
   withFilename:@\"<#Filename to post with#>\"];