這裏記錄下NSMutableData的使用,當我們用到socket傳送信息時,要將數據轉換成數據流。這時就用NSData
下面舉個小例子,說明NSData的用法。
NSMutableData *mutableData = [[NSMutableData alloc] init];
int i = 143;
NSData *data = [NSData dataWithBytes:&i length:sizeof(i)];
[mutableData appendData:data];
NSString *str = @"隨便寫的什麼呢?";
NSData *data3 = [str dataUsingEncoding:NSUTF8StringEncoding];
NSUInteger strlen = data3.length;
NSData *data6 = [NSData dataWithBytes:&strlen length:sizeof(int)];
[mutableData appendData:data6];
[mutableData appendData:data3];
int strlen1 = 0;
[mutableData getBytes:&strlen1 range:NSMakeRange(4, sizeof(int))];
NSData *strData = [mutableData subdataWithRange:NSMakeRange(8, strlen1)];;
NSString *string1 = [[NSString alloc] initWithData:strData encoding:NSUTF8StringEncoding];
NSLog(@"%@",string1);