I am new to iPhone development.I am working on project where i have to create .csv file in application locally and view it within the application itself. I have succeed in creating the .csv file and savig it in document directory.But problem is that i dont know how do i view that .csv excel within the application after creating.Any suggestion is welcome.
Thanks.
I assume u might be saving csv in document directory.U can use UIWebView to display your csv content like this;
NSString *filePath = [self documentsDirectoryPath];
filePath = [filePath stringByAppendingPathComponent:#"file.csv"]; //your saved fileName
if ([[NSFileManager defaultManager]fileExistsAtPath:filePath]) {
[yourWebView loadRequest:[NSURLRequest requestWithURL:[NSURL fileURLWithPath:filePath]]];
}
Get document directory path like this:
- (NSString *)documentsDirectoryPath {
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectoryPath = [paths objectAtIndex:0];
return documentsDirectoryPath;
}
Related
I'm developing an app that provides the ability to store cloud documents.
This app will have the option to import data from other apps using the new UIDocumentPickerViewController.
Everything works fine and I'm able to show the picker view controller.
This is the code that I'm using to import the file:
- (void)documentPicker:(UIDocumentPickerViewController *)controller didPickDocumentAtURL:(NSURL *)url {
if (controller.documentPickerMode == UIDocumentPickerModeImport) {
dispatch_async(dispatch_get_main_queue(), ^{
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0]; // Get documents folder
NSString* path=[NSString stringWithFormat:#"%#/MyHandyTap/%#/%#",documentsDirectory,self.cartella,[url lastPathComponent]];
BOOL startAccessingWorked = [url startAccessingSecurityScopedResource];
NSURL *ubiquityURL = [[NSFileManager defaultManager] URLForUbiquityContainerIdentifier:nil];
__block NSData *data;
NSFileCoordinator *fileCoordinator = [[NSFileCoordinator alloc] init];
NSError *error;
[fileCoordinator coordinateReadingItemAtURL:url options:0 error:&error byAccessor:^(NSURL *newURL) {
data = [NSData dataWithContentsOfURL:newURL];
[data writeToFile:path atomically:YES];
}];
[url stopAccessingSecurityScopedResource];
}
}
With this code I'm able to import a lot of different file formats (.pdf, .txt, .rtf, .doc etc) however if I try to import files .pages or .numbers files from iCloud the call to [NSData dataWithContentsOfURL:newURL] returns null.
Is it possibile to let users import these kinds of files?
I've red the documentation listed here https://developer.apple.com/library/prerelease/ios/documentation/General/Conceptual/ExtensibilityPG/FileProvider.html#//apple_ref/doc/uid/TP40014214-CH18-SW2
and I've downloaded the example listed here : https://developer.apple.com/devcenter/download.action?path=/wwdc_2014/wwdc_2014_sample_code/newboxanintroductiontoiclouddocumentenhancementsinios8.0.zip
however I'm not able to figure out how to solve this issue.
Thank you in advance for your help
Andrea
Even I did not test it, but likely you get the problems, because documents of type .pages or .numbers are no single files, but bundles. So you cannot read them with -dataWithContentsOfURL:.
Did you check copying with -copyItemAtURL:toURL:error: (NSFileManager)?
I am trying to save a file from dropbox in the following way:
NSString *fileName = [NSString stringWithFormat:#"/newFile.json"];
// Do any additional setup after loading the view, typically from a nib.
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory,
NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
NSString* path2 = [documentsDirectory stringByAppendingPathComponent:
[NSString stringWithFormat:#"%#", fileName]];
[[self restClient] loadFile:fileName intoPath:path2];
the file is under apps/appname/sandbox/newFile.json
but I get this error:
2012-05-12 21:05:46.824 Quick Homework & business[934:707] [WARNING] DropboxSDK: error making request to /1/files/sandbox/newFile.json - File not found
but the file is there!!
I found out that in order to access al dropbox folders, even if in the sandbox folder, your app needs to be set to "full dropbox access", otherwise this error comes out. this problem though is there only when trying to download from dropbox, not when uploading or when loading the metadata in a UITableView.
I am trying to write NSString to the file. It is writing successfully however I want to append the new string to new line.
How can do this?
You can read file content, append new data to that content and save new data to a file you use:
// Here you set your appending text.
NSString *yourAppendingText = #"yourAppendingText";
// Here you get access to the file in Documents directory of your application bundle.
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentDir = [paths objectAtIndex:0];
NSString *documentFile = [documentDir stringByAppendingPathComponent:#"yourFile.txt"];
// Here you read current existing text from that file
NSString *textFromFile = [NSString stringWithContentsOfFile:documentFile encoding:NSUTF8StringEncoding error:nil];
// Here you append new text to the existing one
NSString *textToFile = [textFromFile stringByAppendingString:yourAppendingText];
// Here you save the updated text to that file
[textToFile writeToFile:documentFile atomically:YES encoding:NSUTF8StringEncoding error:nil];
I have some data in a .txt file that I dragged over to resources in xcode 4.2. I then use some methods that call upon this file, read it, and display it on the screen to the user. It works. My problem is writing to the end of the same file (aka updating the file based on something the user did) directly on the iphone/ the simulator. It does not write for I feel I am not calling upon the right location and perhaps method. This is my code to write to the end of file, if anyone knows why this is not working it would be tremendous help.
Thank you
-(void)updateFile:(id)sender
{
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
//append filename to docs directory
NSString *myPath = [documentsDirectory stringByAppendingPathComponent:#"Mom.txt"];
fileHandle = [NSFileHandle fileHandleForUpdatingAtPath:myPath];
dateCombinedString= [dateCombinedString lowercaseString];
writtenString= [[NSString alloc]initWithFormat:#", %#, %#, %#",dateString,trimmedString,ForDisplay];
[fileHandle seekToEndOfFile];
[fileHandle writeData:[writtenString dataUsingEncoding:NSUTF8StringEncoding]];
[writtenString release]
}
The file you dragged to Xcode is inside your app resources. You can get the path to resource with this line of code:
NSURL* fileUrl = [[NSBundle mainBundle] URLForResource:#"Mom" withExtension:#"txt"];
However, you cannot modify the files in the resource directory therefore you should first copy that file to your document directory, then modify it with the code in the question.
Here is how you can copy file from resources if the file does not exist on the documents folder:
NSFileManager* fm;
fm = [NSFileManager defaultManager];
//only copy it from resources if it does not exits
if(![fm fileExistsAtPath:myPath]){
NSURL* myUrl = [NSURL fileURLWithPath:myPath];;
NSError* error = nil;
[fm copyItemAtURL:fileUrl toURL:myUrl error:&error];
//handle the error appropriately
}
I'm new to mac and Cocoa so I'm sorry if this is a stupid question..
I need to read all the lines I wrote on a file I saved on my desktop.
The file format is .txt; I tried with stringWithContentsOfFile but the program freezes.
I tried with GDB and I noticed that, while the path is correct, the string which is supposed to contain the data returns nil.
Am I missing something important?
You need to use a path not just the filename
NSString *string;
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
if ([paths count] != 0) {
NSString *documentsDirectory = [paths objectAtIndex:0];
NSString *newFile = [documentsDirectory stringByAppendingPathComponent:#"filename.txt"];
NSFileManager *fm = [NSFileManager defaultManager];
if ([fm fileExistsAtPath:newFile]) {
string = [NSString stringWithContentsOfFile:newFile];
}
}
You will need to replace the documents directory for the bundle directory if you are reading from there.
EDIT
I jumped the gun. It seems that this is NOT an iPhone question. None-the-less, you will need to pass in the full path, not just the filename