nsdata

问题 I can't find a similar method to ALAssetsLibrary->writeImageDataToSavedPhotosAlbum in the new PHPhotoLibrary since ALAssetsLibrary deprecated in iOS 9 I can't save GIF probably I'm using this code [[PHPhotoLibrary sharedPhotoLibrary] performChanges:^{ PHAssetChangeRequest *assetRequest = [PHAssetChangeRequest creationRequestForAssetFromImage:[UIImage imageWithData:gifdata]]; placeholder = [assetRequest placeholderForCreatedAsset]; photosAsset = [PHAsset fetchAssetsInAssetCollection:collection

问题 I have a binary file (file.bin) in the resources folder, I want to read it and show it as binary. The idea its to put the binary information into a array, but, at first, I'm trying to show it in a UILabel, like that: ` NSData *databuffer; NSString *stringdata; NSString *filePath = [[NSBundle mainBundle] pathForResource:@"file" ofType:@"bin"]; NSData *myData = [NSData dataWithContentsOfFile:filePath]; if (myData) { stringdata = [NSString stringWithFormat:@"%@",[myData description]]; labelfile

问题 - (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data { response=[[NSString alloc]initWithData:data encoding:NSUTF8StringEncoding];} Here, I get the response in the "response value" --> [{"response":true,"danger":false}] The thing is: How can I rescue the "danger"(true/false) into a new variable to use it in other methods? I need to know if "danger" is true or false becouse if its true, i have to show an alert. I would really appreciate someone help, as I am stuck in

问题 fairly new iPhone developer here. Building an app to send RS232 commands to a device expecting them over a TCP/IP socket connection. I've got the comms part down, and can send ASCII commands fine. It's the hex code commands I'm having trouble with. So lets say I have the following hex data to send (in this format): \x1C\x02d\x00\x00\x00\xFF\x7F How do I convert this into an NSData object, which my send method expects? Obviously this does not work for this hex data (but does for standard ascii

问题 I am converting NSData of Image from database to NSString in Iphone Here is my code imageData1 = [[NSData alloc] initWithBytes:sqlite3_column_blob(compiledStatement, 3) length: sqlite3_column_bytes(compiledStatement, 3)]; NSString * Str1 = [NSString base64StringFromData: imageData1 length: [imageData1 length]]; NSData *data1=[NSData base64DataFromString:Str1]; NSString* newStr1 = [[NSString alloc] initWithData:data1 encoding:NSUTF8StringEncoding]; the length of data is 6511 , but the newstr1

问题 I need to do bit operations on representations of arbitrary precision numbers in Objective C. So far I have been using NSData objects to hold the numbers - is there a way to bit shift the content of those? If not, is there a different way to achieve this? 回答1: Using NSMutableData you can fetch the byte in a char , shift your bits and replace it with -replaceBytesInRange:withBytes: . I don't see any other solution except for writing your own date holder class using a char * buffer to hold the

问题 My app has terminated due to memory pressure when I load a particular page. I am using an NSURLRequest to get data and load an image. I placed breakpoints throughout my code and traced the first didRecieveMemoryWarning call to right after viewDidAppear. Here is the code I am using to load the image: NSError *error = nil; NSURLResponse *response = nil; NSURLRequest *request = [NSURLRequest requestWithURL:[NSURL URLWithString:self.img]]; NSData *data = [NSURLConnection sendSynchronousRequest

问题 I have two data in core data. Entity Name = "Contact", Attribute Name = "date"(selected datePicker.date), "content"(textFeild.text) It is that sort of information in a table view, was a success. I want to show only one content in the another view controller. The data of the closest time to the current time. I was asked to help with the following code. var stores: Contact? if ((stores?.date!.timeIntervalsince1970 ?? 0) > NSDate().timeIntervalSince1970) { labelName.text = stores?.content! } But

问题 I have a sound player which uses AVAudioPlayer class. I download some items in another view and store the filepath to it as NSURL, then pass the NSURL to the Player viewcontroller. But i get an error while trying to pass the object. *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[__NSCFString path]: unrecognized selector sent to instance 0x1700c86c0' And here is the code: NSData *data = [NSData dataWithContentsOfFile:[podcastSource path]]; NSError *error

问题 I have file in XCode with name vvideo.mp4. I am trying to convert it to NSData like below NSData *data = [NSData dataWithContentsOfFile:@"vvideo.mp4" options:nil error:nil]; But as I log data, it returns null. What is right way to convert any video to NSData? File is added and copies properly in Xcode, you can see here. EDITED QUESTION.... 回答1: dataWithContentsOfFile:options:error: takes a file path and not file name. If the video file is in application bundle you should do, NSString