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PORetrieve HTTP POST variables using multipart/form-data sent from an iOS device
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copied!<p>I need to retrieve the POST variables being sent from my iOS application, but so far I have had no luck. Here is some background:</p> <p>I have an iOS application that posts an image along with some variables to a php page that simply saves the variables in a file (for debugging) and moves the image to the current directory (server side). I can get a handle on the image without issue using the $_FILE variable, however I cannot seem to get any of the POST parameters at all.</p> <p>Some general info and what I've tried:</p> <ul> <li>Tried getting post variables with $_POST, then dumped $_POST...it was empty</li> <li>Tried dumping $HTTP_RAW_POST_DATA (though <a href="http://www.php.net/manual/en/ini.core.php#ini.always-populate-raw-post-data" rel="nofollow noreferrer">this page</a> says it's not populated when using multipart/form-data)</li> <li>Checked the "post_max_size" variable (it's 8MB, I'm sending in the KB range) after seeing <a href="https://stackoverflow.com/questions/1075513/php-parsing-multipart-form-data">this post</a></li> <li>Used wireshark to verify that the variables are indeed being received by the server</li> </ul> <p>I'm using modified sample code <a href="https://stackoverflow.com/questions/8564833/ios-upload-image-and-text-using-http-post?answertab=votes#tab-top">from here</a></p> <pre><code>// create request NSMutableURLRequest *request = [[NSMutableURLRequest alloc] init]; [request setCachePolicy:NSURLRequestReloadIgnoringLocalCacheData]; [request setHTTPShouldHandleCookies:NO]; [request setTimeoutInterval:30]; [request setHTTPMethod:@"POST"]; NSMutableDictionary* _params = [[NSMutableDictionary alloc] init]; [_params setObject:@"1.0" forKey:@"ver"]; [_params setObject:@"en" forKey:@"lan"]; [_params setObject:[NSString stringWithFormat:@"%@", @"myUserName"] forKey:@"userId"]; // the boundary string : a random string, that will not repeat in post data, to separate post data fields. NSString *BoundaryConstant = @"V2ymHFg03ehbqgZCaKO6jy"; // string constant for the post parameter 'file' NSString *FileParamConstant = @"media"; //Setup request URL NSURL *requestURL = [[NSURL alloc] initWithString:@"http://myWebAddress/myAction.php"]; // set Content-Type in HTTP header NSString *contentType = [NSString stringWithFormat:@"multipart/form-data; boundary=%@", BoundaryConstant]; [request setValue:contentType forHTTPHeaderField: @"Content-Type"]; // post body NSMutableData *body = [NSMutableData data]; // add params (all params are strings) for (NSString *param in _params) { [body appendData:[[NSString stringWithFormat:@"--%@\r\n", BoundaryConstant] dataUsingEncoding:NSUTF8StringEncoding]]; [body appendData:[[NSString stringWithFormat:@"Content-Disposition: form-data; name=\"%@\"\r\n\r\n", param] dataUsingEncoding:NSUTF8StringEncoding]]; [body appendData:[[NSString stringWithFormat:@"%@\r\n", [_params objectForKey:param]] dataUsingEncoding:NSUTF8StringEncoding]]; } // add image data NSData *imageData = UIImageJPEGRepresentation([self.imageButtonOutlet backgroundImageForState:UIControlStateNormal], 1.0); if (imageData) { printf("appending image data\n"); [body appendData:[[NSString stringWithFormat:@"--%@\r\n", BoundaryConstant] dataUsingEncoding:NSUTF8StringEncoding]]; [body appendData:[[NSString stringWithFormat:@"Content-Disposition: form-data; name=\'%@\'; filename=\"image.jpg\"\r\n", FileParamConstant] dataUsingEncoding:NSUTF8StringEncoding]]; [body appendData:[@"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", BoundaryConstant] dataUsingEncoding:NSUTF8StringEncoding]]; // setting the body of the post to the reqeust [request setHTTPBody:body]; // set the content-length NSString *postLength = [NSString stringWithFormat:@"%d", [body length]]; [request setValue:postLength forHTTPHeaderField:@"Content-Length"]; // set URL [request setURL:requestURL]; NSURLConnection *postConnection = [[NSURLConnection alloc] initWithRequest:request delegate:self]; [postConnection start]; [postConnection release]; </code></pre> <p>Also, here is myAction.php, as it stands right now:</p> <pre><code><?php $fp_file = fopen("./output_files.txt", "w"); $fp_post = fopen("./output_post.txt", "w"); $post_content = var_export($_POST , TRUE); $file_content = var_export($_FILES, TRUE); fwrite($fp_file, $file_content); fwrite($fp_post, $post_content); fclose($fp_file); fclose($fp_post); move_uploaded_file( $_FILES['media']['tmp_name'], "test.jpg"); ?> </code></pre>

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