Reading a raw datafile

To open a file and read its data first you need to get the path to the file.

    NSBundle* bundle = [NSBundle mainBundle];

    NSString* documentsDirectory = [bundle resourcePath];

    

    NSString *path = [documentsDirectory stringByAppendingString:@"/GBPUSD5.csv"];

documentsDirectory will hold the path to the resources folder of our application. I have chucked the GBPUSD5.csv file into there. Then I get the whole path by appending the filename GBPUSD5.csv to it. Note I have had to put the / in as well..

We open the file :

    NSFileHandle *file = [NSFileHandle fileHandleForReadingAtPath:path];

and can jump to any position in the file :

    [file seekToFileOffset:0];

Then we can read the data we need :

        NSData *record = [file readDataOfLength:48];

        NSString* aStr = [[NSString alloc] initWithData:record encoding:NSASCIIStringEncoding];

aStr contains the data as a string that we can get down and boogy with!