singh_nav wrote: Is there any API or C function or any logic to convert IPv6 address to IPv4 Address for window and linux. Only to a limited degree. See here for more. The operative sentence is, "Obviously, that's impossible, since IPv6 has a larger address space... Your technique will only work on IPv4-mapped IPv6 addresses". "Love people and use things, not love things and use people." - Unknown "The brick walls are there for a reason...to stop the people who don't want it badly enough." - Randy Pausch

Would help if you were to show some of your code too. 10038 is. btw, WSAENOTSOCK, so you specified something that's not a socket to a call which takes a valid socket. At the first run, without knowing much of what your code does, i'd say this is a thread synch problem. > The problem with computers is that they do what you tell them to do and not what you want them to do. <

singh_nav wrote: Now my question is how to use the synchronization technique so that 9 threads should not wait if no writing is taking place. Reader Writer Lock[^] Mark Salsbery Microsoft MVP - Visual C++ :java:

No problem :cool: There is sufficient light for those who desire to see, and there is sufficient darkness for those of a contrary disposition. Blaise Pascal

Recently i came across this library http://www.alhem.net/Sockets/index.html[^] I hope it helps. Regards, Sandip.

See Named Pipe Instances[^] Mark Mark Salsbery Microsoft MVP - Visual C++ :java:

Yup, pretty amazing, isn't it? But the evidence is right there in the code. X| I've never used the MFC sync classes since I read Joe's advice many years ago in a much earlier essay of his. Even though CCriticalSection may work if it's only locked once in a call chain, you will eventually find yourself in a situation where you should perform a second lock due to encapsulation and at that time you're smoked; a re-write using the Win32 primitives is essential before it has a chance of working. "It's supposed to be hard, otherwise anybody could do it!" - selfquote "High speed never compensates for wrong direction!" - unknown

yes i tried to debug it , But it crash before it comes in the App class Init function . ND

I think you need to add library to your program WhiteSky

Hi Alexender Thanks for the suggestion and replay. I agree with u but what i just want to do. I read a cluster using ReadFile() function and keep it in buffer . Now my question is how to compress this data which is in buffer so that if i write it any other place as a backup. It takes less memory space in HDD or any other storing device. I am to compress files but cluster by cluster because i want to store the backup of this file in bytes(row) form not in file form [compressed file takes clusters again wastage of space ] . This might be crap idea. But u would be able to help me , i'll be thankfull. Now Ball is in your goal:)

Check registry. Kuphryn