trouble with IPAddress class

Hi I used Reflector (google for it, its free) to have a look on the .net framework code. I think you could use the constructor IPAddress(long address) for an easy use. Therefore you have to make a conversion between bytes and long and reverse. public static byte[] GetBytes(long l) { byte[] b = new byte[4]; b[0] = (byte) ((l) >> 0); b[1] = (byte) ((l) >> 8); b[2] = (byte) ((l) >> 16); b[3] = (byte) ((l) >> 24); return b; } public static long GetLong(byte[] b) { long l = 0; if (b.Length != 4) { throw new ArgumentException("Length of byte array has to be 4.", "b"); } long tmp = 0; tmp = b[0] << 0; l |= tmp; tmp = b[1] << 8; l |= tmp; tmp = b[2] << 16; l |= tmp; tmp = b[3] << 24; l |= tmp; return l; } Maybe i helped. Simon

Thanks for the info! How did you find the implementation of the constructor? Can I simply find it and open it in VS.net? Also, any suggestions on how I should go forth. I want to scan a range of addresses. My initial thought was to extract the address as byte[], increment the last byte, then put the array back in the object. Can anyone think of a simpler way to do this? -pfoh

Hi It's really tricky and MSDN says not a word about it... The constructor IPAddress(byte[] address) expects an ip address V6 in a byte sequence. So, the expected length of the array is 16. I had a look on the IPAddress code... // Constructor you called. public IPAddress(byte[] address) : this(address, (long) 0) { } public IPAddress(byte[] address, long scopeid) { this.m_Family = AddressFamily.InterNetwork; this.m_Numbers = new ushort[8]; this.m_ScopeId = 0; this.m_HashCode = 0; if (address == null) { throw new ArgumentNullException("address"); } if (address.Length != 0x10) { throw new ArgumentException("address"); // Here is the exception thrown!! } this.m_Family = AddressFamily.InterNetworkV6; for (int num1 = 0; num1 < 8; num1++) { this.m_Numbers[num1] = (ushort) ((address[num1 * 2] * 0x100) + address[(num1 * 2) + 1]); } if ((scopeid < 0) || (scopeid > 0xffffffff)) { throw new ArgumentOutOfRangeException("scopeid"); } this.m_ScopeId = scopeid; } So, i don't know how IPV6 addresses are built... but this explains why your call failed. I know, this solves not your problem, but gives you a hint. Simon

I am pretty sure Im using 1.1, this is independant of the version of VS.net im using right? If I have the 1.1 framework installed, it should work right? I believe it is just a generic argument exception, im at work now so its not in front of me. But, I am 99% sure it is a generic ArgumentException. The only futher info I get is "address", which is the argument variable. Thanks -pfoh

Hi See: MSDN... http://msdn.microsoft.com/library/default.asp?url=/library/en-us/cpref/html/frlrfsystemnetipaddressclassctortopic1.asp Are you using .net framework V1.0? It seems that this constructor is not implemented. What kind of exception was thrown? Simon