Question

i have a C type matrix of structs in my program. I want to write it in a file for older devices who don’t have multitasking.

is there any simple way to write it to disk or do i have to wrap it in a custom object and write that?

an example would be great.

Answer 1

You can use NSData‘s dataWithBytes:length: method to wrap your matrix and write it to file.

MyStruct matrix[20][30];
NSData *data = [NSData dataWithBytes:matrix length:sizeof(matrix)];
[data writeToFile:myFile atomically:YES];

NSData *back = [NSData dataWithContentsOfFile:myFile];
MyStruct backMatrix[20][30];
[back getBytes:&backMatrix];