Here is my code, I was using a QLPreviewController for display a detail view with a pdf file which I download and stock at the beginning of the program.
It throw a exception with telling the path was null.
-(id<QLPreviewItem>)previewController:(QLPreviewController *)previewController previewItemAtIndex:(NSInteger)index{
NSString *name=[selectedItem.source lastPathComponent];
NSFileManager *fileManager=[NSFileManager defaultManager];
if([fileManager fileExistsAtPath:name] ){
NSLog(#"%# exsit! ",name); //In!!!
}
name = [name stringByDeletingPathExtension];
NSLog(#"name for QL: %#",name); //Name ok!!!
NSString *path = [[NSBundle mainBundle]pathForResource:name ofType:#"pdf"];
NSLog(#"path: %#",path); //Path: null !!!
return [NSURL fileURLWithPath:path]; //error!!
}
Files don't download to [NSBundle mainBundle]. Try changing that line to
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
NSString *filePathString = [documentsDirectory stringByAppendingPathComponent:fileName];`
rather than reading from [NSBundle mainBundle]. You can't download files to mainBundle. It's read only.
Related
in my application, i have placed an empty
myFile.txt
when i have internet connection , i get json data from internet and save the json string in it with following code
NSString *filePath = [[NSBundle mainBundle] pathForResource:#"myFile" ofType:#"txt"];
[myString writeToFile:filePath automatically:YES encoding:NSUTF... error:nil];
//now while retrieving it when no internet connection
NSString *filePath = [[NSBundle mainBundle] pathForResource:#"myFile" ofType:#"txt"];
NSString *myString = [[NSString alloc] initWithContentsOfFile:filePath encoding:NSUTF.. error:nil];
now myString returns with #""... why i am not been able to write data?
Best Regards
Whatever you want to do is not possible (or at least strongly discouraged) to update files in the app bundle.
If you’re downloading files and want to store them on the device you should use the Documents directory. You can get the path to this directory with:
- (NSString *)getDocumentsDirectory {
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
return [paths objectAtIndex:0];
}
First check weather the contents are getting written to file. You can view the file in xcode.
What i suggest is when you run the app create this empty file. Then you can Read and write to that file easily.
Try Using Below code:
NSError* error = nil;
NSString* jsonFileName = [NSString stringWithFormat:#"myfile"];
NSString* jsonPath = [[NSBundle mainBundle] pathForResource:jsonFileName
ofType:#"txt"];
NSString* jsonString = [NSString stringWithContentsOfFile:jsonPath
encoding:NSUTF8StringEncoding error:&error];
Documents directory:
Write to file
NSArray *paths = NSSearchPathForDirectoriesInDomains
(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
//make a file name to write the data to using the documents directory:
NSString *fileName = [NSString stringWithFormat:#"%#/textfile.txt",
documentsDirectory];
//create content - four lines of text
NSString *content = #"One\nTwo\nThree\nFour\nFive";
//save content to the documents directory
[content writeToFile:fileName
atomically:NO
encoding:NSStringEncodingConversionAllowLossy
error:nil];
Display content:
NSArray *paths = NSSearchPathForDirectoriesInDomains
(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
//make a file name to write the data to using the documents directory:
NSString *fileName = [NSString stringWithFormat:#"%#/textfile.txt",
documentsDirectory];
NSString *content = [[NSString alloc] initWithContentsOfFile:fileName
usedEncoding:nil
error:nil];
I can load list of pdf files(all pdf files) from Resources folder, using this code.
NSArray *pdfs = [[NSBundle mainBundle] pathsForResourcesOfType:#"pdf" inDirectory:nil];
But I couldn't find a method to load list of pdf files from Documents Directory. The following line of code can only load one pdf at a time.
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
NSString *file = [documentsDirectory stringByAppendingPathComponent:#"test.pdf"];
NSURL *urlPdf = [NSURL fileURLWithPath: file];
How could I load all pdf files from Documents Directory
Can you please give me a code example.
I was able to solve my issue using this line of code :)
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSArray *pdfs = [[NSBundle bundleWithPath:[paths objectAtIndex:0]] pathsForResourcesOfType:#"pdf" inDirectory:nil];
Go with NSFileManager's contentsOfDirectoryAtPath and filter the result by hand for pdf files.
This answer maybe helpful.
You could do this
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
NSFileManager *fileManager = [NSFileManager defaultManager];
NSError *error = nil;
NSArray *filesAtPath = [fileManager contentsOfDirectoryAtPath:documentsDirectory error:error];
for (NSString *path in filesAtPath)
{
if ([path rangeOfString:#".pdf"].length > 0)
{
//Do whatever you want with the pdf file
}
}
I hope it helps, cheers
How to make file read/write operation on iPhone?which is the path i need to specify to save the file? how can i get the current working directory in iPhone?
Thank You
Write to a file:
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
// the path to write file
NSString *myFile = [documentsDirectory stringByAppendingPathComponent:#"myFile"];
[data writeToFile:myFile atomically:YES];
Read a file:
NSString *filePath = [[NSBundle mainBundle] pathForResource:#"MyFile" ofType:#"txt"];
NSData *myData = [NSData dataWithContentsOfFile:filePath];
if (myData) {
// do something useful
}
I am trying to copy a couple of image files from my MainBundle/SampleImages folder to the application NSDocumentDirectory/Library folder, but am unable to do so. I have checked that the images are in .app/Mainbundle/SampleImages directory and I have also checked that the Library folder is being created in the NSDocumentsDirectory, but no files are copied.
I have tried two approaches, given below, but with no success.
here is the code that I am using to copy files.
First Method
NSArray *paths = NSSearchPathForDirectoriesInDomains( NSDocumentDirectory,NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
NSString *documentLibraryFolderPath = [documentsDirectory stringByAppendingPathComponent:#"Library"];
NSString *resourceSampleImagesFolderPath = [[[NSBundle mainBundle] resourcePath] stringByAppendingPathComponent:#"SampleImages"];
NSData *mainBundleFile = [NSData dataWithContentsOfFile:resourceSampleImagesFolderPath];
[[NSFileManager defaultManager] createFileAtPath:documentLibraryFolderPath
contents:mainBundleFile
attributes:nil];
Second Method
NSArray *paths = NSSearchPathForDirectoriesInDomains( NSDocumentDirectory,NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
NSString *documentSampleImagesFolderPath = [documentsDirectory stringByAppendingPathComponent:#"Library"];
NSString *resourceSampleImagesFolderPath = [[[NSBundle mainBundle] resourcePath] stringByAppendingPathComponent:#"SampleImages/"];
[fileManager createDirectoryAtPath: documentSampleImagesFolderPath attributes:nil];
if([fileManager copyItemAtPath:resourceSampleImagesFolderPath toPath:documentSampleImagesFolderPath error:&error]) {
NSLog(#"success");
}
else {
NSLog(#"Failure");
NSLog(#"%d",error);
}
I have spent a couple of hours looking for a solution, any help here would be appreciated greatly.
Thank You
Shumais Ul Haq
I got it done with the second method by changing it bit.
There is no need for creating the directory as the SDK docs say that the destination directory must not exist.
NSFileManager *fileManager = [NSFileManager defaultManager];
NSError *error;
NSArray *paths = NSSearchPathForDirectoriesInDomains( NSDocumentDirectory,
NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
NSString *documentDBFolderPath = [documentsDirectory stringByAppendingPathComponent:#"Library"];
NSString *resourceDBFolderPath = [[[NSBundle mainBundle] resourcePath]
stringByAppendingPathComponent:#"SampleImages"];
[fileManager copyItemAtPath:resourceDBFolderPath toPath:documentDBFolderPath error:&error];
I current have everything setup to read from the documents directory and write to it , but Cannot do it because the file doesnt exist yet.
How is a file created within the code?
If you already have a template version of the document in your application's bundle then you should be able to write it to the application's document directory using something similar to the following. I haven't tested this code so I've probably got a few things wrong but that's the general idea.
- (void) applicationDidFinishLaunching {
NSArray* directories = NSSearchPathsForDirectoriesInDomain(NSDocumentsDirectory, NSUserDomainMask, YES);
NSString* documentsDirectory = [directories objectAtIndex: 0];
NSString* path = [documentsDirectory stringByAppendingPathComponent: #"Something.plist"];
if (![[NSFileManager sharedInstance] fileExistsAtPath: path]) {
NSString* infoTemplatePath = [[NSBundle mainBundle] pathForResource: #"Something" ofType: #"plist"];
NSDictionary* info = [NSDictionary dictionaryWithContentsOfFile: infoTemplatePath];
[info writeToFile: path];
}
}
Use NSFileManger's fileExistsAtPath: to see if the file exist. If not create it before going on to the code that requires the file.
This one works better for me:
NSFileManager *fileManager = [NSFileManager defaultManager];
NSError *error;
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
NSString *documentDBFolderPath = [documentsDirectory stringByAppendingPathComponent:#"*.db"];
if (![fileManager fileExistsAtPath:documentDBFolderPath])
{
NSString *resourceDBFolderPath = [[[NSBundle mainBundle] resourcePath] stringByAppendingPathComponent:#"*.db"];
[fileManager copyItemAtPath:resourceDBFolderPath toPath:documentDBFolderPath error:&error];
}