Variables

Apocolypse2005 · July 24th, 2009, 06:21 PM

Hi all,

I have this piece of code sourced of the internet:

Code:

structid3v2frameheader
{
char frameid[4]; 
unsigned long size; 
unsigned char flag1; 
unsigned char flag2;
};

I have tried to put this into c# but it doesn't like a) the frameid[4], the 4 being the specified length of that char, b) the unsigned variable, is there any equivalents i could use?

Thanks inadvance

C@uark · October 31st, 2009, 05:09 AM

There are couple things you can do here:

declare a managed array as so
char[] frameid = new char[4]; //and use the operator new to init, also rank specifier preceeds variable name in c#

or declare a fixed length buffer field as so
fixed char frameid[4];

sh_erfan · November 12th, 2009, 10:12 AM

First problem:You should dynamically allocate memory for array of characters (not needed for a single character like "char a;").so you can use this code (As C@uark mentioned in previous quote):

Code:

char[] frameid = new char[4];

Second problem:in C# 2008 (not sure about other versions),we don't have keyword "unsigned".Instead,we use the character 'u' before the unsigned types.For example:

Code:

uint x=5;

This piece of code declares x as a variable of type unsigned int.In other words,'u' is a shorthand for "unsigned".

And about char we don't have unsigned char,because char's definition is:
Single Unicode character, stored as an integer between 0 and 65535.
This is a definition from book "Beginning Microsoft Visual C# 2008".
As you see,char is automatically unsigned!!

You should enter this code instead of whole:

Code:

struct id3v2frameheader
{
char[] frameid = new char[4]; 
ulong size;//ulong is used instead of unsigned long 
char flag1;
char flag2;
};

Erfan