You could be right, too, if fopen() is simply a wrapper around CreateFile(). "One man's wage rise is another man's price increase." - Harold Wilson "Fireproof doesn't mean the fire will never come. It means when the fire comes that you will be able to withstand it." - Michael Simmons "Show me a community that obeys the Ten Commandments and I'll show you a less crowded prison system." - Anonymous

sindhumahe wrote: and i have succeeded in exporting them Are really certain that you have succeeded? It seems not. First you need to ensure that your function is exported property.If you use the definition: extern __declspec(dllexport) bool Callregistercallback(CRTSPWrapper* pObject,funccallback fptr_video,funccallback fptr_audio,void* ptr); without appropriate definition of the function inside the library module definition file,or without setting configuration the compiler to compile the lib as C code you will be unable to call it using: [DllImport("sampleclient_dll.dll", CharSet = CharSet.Ansi)] static private extern bool Callregistercallback(IntPtr pTestClassObject,IntPtr fptr_video,IntPtr fptr_audio,IntPtr ptr); That happens because by default every function is compiled as C++ code not as C code and C++ uses names decoration to avoid conflicts between functions with the same names but with different arguments. Refer to this article for more details how to properly export your functions. Life is a stage and we are all actors!

I'm pretty sure "_security_cookie" is the name for the compiler object used for stack verification (local stack value set using the cookie upon function entry, then checked on exit). Who ever built those libraries you're trying to use probably compiled with /GS. A quick google came up with this which may provide some answers (just skimmed the article).

If you do not have the necessary .lib files, the problem cannot be resolved. "One man's wage rise is another man's price increase." - Harold Wilson "Fireproof doesn't mean the fire will never come. It means when the fire comes that you will be able to withstand it." - Michael Simmons "Man who follows car will be exhausted." - Confucius

if this is a C# question, it's in the wrong forum. if it's a C++ question, then you have to either tell the compiler where to find BasicHashTable.hh or, put BasicHashTable.hh in a place where the compiler is already looking. image processing toolkits | batch image processing

one of my spiders takes a snapshot of www.codeproject.com on an hourly base; and a second one posts replies to the questions that match some filter criteria. More seriously, yes there are ways to see what isn't there any more. I only use it to tell them of though. :) Luc Pattyn [Forum Guidelines] [Why QA sucks] [My Articles] Getting an article published on CodeProject now is hard and not sufficiently rewarded.

Try asking your question again in the correct forum - at least you have a chance of getting a sensible answer in there :) http://www.codeproject.com/Forums/1650/NET-Framework.aspx[^]

:laugh: Why is common sense not common? Never argue with an idiot. They will drag you down to their level where they are an expert. Sometimes it takes a lot of work to be lazy Individuality is fine, as long as we do it together - F. Burns Help humanity, join the CodeProject grid computing team here

http://social.msdn.microsoft.com/Forums/en-US/sqlanalysisservices/thread/07a10fae-3133-4081-b747-338cd767a557[^] Reinstall the COM libs for the camera, it's probably solve your problem.

I suppose you want to send http requests to those cams and receive whatever response the cams send back. In this case you might take a look at the System.Net.WebClient class in the MSDN. With this class you can send HttpRequests and receive the responses. Good Luck. A while ago he asked me what he should have printed on my business cards. I said 'Wizard'. I read books which nobody else understand. Then I do something which nobody understands. After that the computer does something which nobody understands. When asked, I say things about the results which nobody understand. But everybody expects miracles from me on a regular basis. Looks to me like the classical definition of a wizard.