File location for iPod/iPhone/iPad

[Shades of Chaos]

Hey all,

I am trying to write a file to somwhere on the device so that a javascript file can locate it. Current I am writing to the documents of the device. I am getting the directory but using

NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];

But I have notice that to directory is different for iPod and iPad (i don't know about iPhone). I have tried writing to other folders along the directory path like

[responseString writeToFile:@"/var/mobile/test.json"
atomically:YES
encoding:NSUTF8StringEncoding
error:NULL];

But it doesn't seem to work. Is there somewhere that I can write the file that all the devices can access using the same directory.

Thanks
Clinton

[smithdale87]

You can use the documents directory. You dont need to know the exact path i.e. the "/var/mobile...", just that you have the ability to write files there.

Why do you think you need to know the exact path, and moreover, why do you think this path needs to be the same on different devices?

[Shades of Chaos]

Well I was using

[responseString writeToFile:[NSString stringWithFormat:@"%@/test.json", documentsDirectory] 
					 atomically:YES 
					   encoding:NSUTF8StringEncoding 
						  error:NULL];

And it wrote to the documents of the device just fine. But I am reading it from a javascript file. But when I used

NSLog(@"%@", documentsDirectory);

I noticed that it changed from the iPod to the iPad. So I think I need to either write the file using the same path or somehow pass documentDirectory into the javascript file.

[Duncan C]

Originally Posted by Shades of Chaos

Well I was using

[responseString writeToFile:[NSString stringWithFormat:@"%@/test.json", documentsDirectory] 
					 atomically:YES 
					   encoding:NSUTF8StringEncoding 
						  error:NULL];

And it wrote to the documents of the device just fine. But I am reading it from a javascript file. But when I used

NSLog(@"%@", documentsDirectory);

I noticed that it changed from the iPod to the iPad. So I think I need to either write the file using the same path or somehow pass documentDirectory into the javascript file.

There is no guarantee that the path to the documents directory will be the same between devices. In fact, it is likely to be different on every device. The system assigns a path to your app when it gets installed from the app store, and that path is quite likely to be different from device to device and user to user.

You should ask the system for the path to the documents directory and use that. Don't assume it will stay the same.

You will need a way to pass it to JavaScript of you need to use it in JavaScript.

[Shades of Chaos]

How would I pass it to the javascript. I have a HTML file which I call and then the HTML file calls the javascript file. I am currently trying this

NSString *htmlFile = [[NSBundle mainBundle] pathForResource:@"index" ofType:@"html" inDirectory:@"RssiSample"];
	NSData *htmlData = [NSData dataWithContentsOfFile:htmlFile];
	[webView loadData:htmlData MIMEType:@"text/html" textEncodingName:@"UTF-8" baseURL:[NSURL URLWithString:@""]];
	
	NSString* script = [NSString stringWithFormat:@"directory	= \"%@\";", documentsDirectory];
	[webView stringByEvaluatingJavaScriptFromString:script];

directory is a var located at the top of the javascript file. I believe it is a global var. But this code is not working. I think it is because I have not specified the javascript file but I am not sure how to do that.

[Duncan C]

Originally Posted by Shades of Chaos

How would I pass it to the javascript. I have a HTML file which I call and then the HTML file calls the javascript file. I am currently trying this

NSString *htmlFile = [[NSBundle mainBundle] pathForResource:@"index" ofType:@"html" inDirectory:@"RssiSample"];
	NSData *htmlData = [NSData dataWithContentsOfFile:htmlFile];
	[webView loadData:htmlData MIMEType:@"text/html" textEncodingName:@"UTF-8" baseURL:[NSURL URLWithString:@""]];
	
	NSString* script = [NSString stringWithFormat:@"directory	= \"%@\";", documentsDirectory];
	[webView stringByEvaluatingJavaScriptFromString:script];

directory is a var located at the top of the javascript file. I believe it is a global var. But this code is not working. I think it is because I have not specified the javascript file but I am not sure how to do that.

I have no idea. I know very little about JavaScript. Sorry.