将前面的两篇文章综合起来，我们可以随心所欲地保存数据了
http://blog.csdn.net/iBright/archive/2010/06/08/5655857.aspx
http://blog.csdn.net/iBright/archive/2010/06/08/5656164.aspx
代码如下：
typedef struct _AA{
NSString *nameA;
}AA;
typedef struct _BB{
int k;
float m;
NSString *nameB;
AA aa;
}BB;
BB f[2] = {
{10,0.5f,@"bright",{@"a1"}},
{5,0.3f,@"mtf",{@"a2"}}
};
NSValue *value1 = [NSValue valueWithBytes:&f[0] objCType: @encode(BB)];
NSValue *value2 = [NSValue valueWithBytes:&f[1] objCType: @encode(BB)];
NSArray *array = [NSArray arrayWithObjects:value1,value2,nil];
NSLog(@"array == %@",array);
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
if (!documentsDirectory) {
NSLog(@"Documents directory not found!");
}
NSString *appFile =[documentsDirectory stringByAppendingPathComponent:@"save"];
NSMutableData *data = [NSMutableData data];
[data appendBytes:&array length:sizeof(array)];
NSLog(@"data===%@",data);
[data writeToFile:appFile atomically:YES];
NSMutableData *readData = [NSMutableData dataWithContentsOfFile:appFile];
NSLog(@"readData==%@",readData);
NSArray *final;
[readData getBytes:&final range:NSMakeRange(0,sizeof(final))];
NSLog(@"final===%@",final);
BB c;
for (NSValue *aValue in final) {
NSLog(@"%@",aValue);
[aValue getValue:&c];
NSLog(@"%d",c.k);
NSLog(@"%f",c.m);
NSLog(@"%@",c.nameB);
NSLog(@"%@",c.aa.nameA);
}