Re: Corruption while using asynchronous callbacks on read/write socket calls.

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Hello Charles,
I would be obliged if you can have a look into this issue.

Thanks,
Henin.

henin wrote:

Hi,
Regarding our Application it's not a single threaded.It has multiple
threads but we spawn a thread for each connection and that thread
can go for synchrounous or asynchronous read/write.

The answer for your quries are as follows::
1)No we never use ZeroMemory in our code.
2)I can say this that so far we have hit this issue only when one thread
performs operations on a multiple sockets, of this synchronous on one
and asynchronous on the other.
3)Sorry according to our rules here I cannot pass on code-snippet across
to you but I can clarify all your quiries.

Can you please tell me what exactly are you looking at, then I will be
able to clear out the things we use here.

I was concerned in the sense that the callback never got any error
returned but the parameter which tells the amount of data read has
some junk data.

Thanks,
Henin.

Charles Wang[MSFT] wrote:

Hi,
My understanding of this issue is that:
When you used the WSARecv function to retrieve data you found that the transferred data bytes number showed in the callback routine completion function was much more than your limitation 2K. Your application is single thread synchronously or asynchronously sending and retrieving data on multiple sockets.
If I have misunderstood, please let me know.

For locating this issue more accurately, I would like to know:
1) Was the ZeroMemory function used to empty the overlapped structure before calling the WSARecv function?
2) Does this issue persist if your application has communications on only one socket?
3) Could you send me some code slice of your application for further research? If it's not convenient for you to publish your code, you can mail it to me (changliw@xxxxxxxxxxxxx).

Sincerely yours,
Charles Wang
Microsoft Online Community Support

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