Re: Why does C++ program run differently on VxWorks?

"Jim Langston" <>
Wed, 12 Jul 2006 02:04:20 -0700
"Allen" <> wrote in message

I wrote many classes. In a class, there is a member variable which is
declared as char szMTreeBuf[4096]. On both Windows XP and VxWorks, it
cannot work. Then I try to declare the member variable as static char
szMTreeBuf[4096], it can work again. But when add some other function
codes, it cannot run normally. I modify the class delearation, and
change szMTreeBuf member variable to be local variable. Again it can
run now.

Why does C++ program run differently on VxWorks?

OS: VxWorks 5.5.1
Memory: 16M

You say it cannot run normally. What type of error do you get? Stack
overflow? Memory allocation?

One thing you might try is forcing it to use dynamic memory.

char* szMTreeBuf;

and in the constructor or initializaer
szMTreeBuf = new char[4096];

I suspect that will probably work.

It may also work the way you have it if you increase the stack size, you'll
have to look for settings for that in your compiler(s).

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