Tek-Tips is the largest IT community on the Internet today!
Members share and learn making Tek-Tips Forums the best source of peer-reviewed technical information on the Internet!
-
Congratulations Rhinorhino on being selected by the Tek-Tips community for having the most helpful posts in the forums last week. Way to Go!
_CrtIsValidHeapPointer(pUserData)? 2
- Thread starter Zech
- Start date
-
1
- #2
It seems that you try either to delete memory which has already been released or to delete memory which wasn't allocated dynamically on heap, but on stack. Eg.
Standa K.
Code:
void func()
{
int i = 0;
int* pi = &i;
delete pi; // we're deleting non-heap memory
}Standa K.
-
1
- #3
Cagliostro
Programmer
or
int *x;
*x = 123;//x is not initialized
when you will look in debugger the falue of x will be probably 0xCCCCCCCC or 0xC0C0C0C0 or something like that. If x is 0 then it is a null pointer exception.
Also an error is:
int *x = new int[elements];
for(int i = 0; i <= elements; i++)
{
x = something...
//error when i will be elements;, put elements - 1
//instead of elements or < instead of <=
}
this error is often raised when working especially with arrays and strings. For example
int len = strlen(somestring);
char* acopy = new char[len];//to avoid error put there len+1
strcpy(acopy, somestrimg);//there is an error
Many of these errors you will not get when working in release mode or when just lauching the exe module. But these errors are dangerous.
Ion Filipski
int *x;
*x = 123;//x is not initialized
when you will look in debugger the falue of x will be probably 0xCCCCCCCC or 0xC0C0C0C0 or something like that. If x is 0 then it is a null pointer exception.
Also an error is:
int *x = new int[elements];
for(int i = 0; i <= elements; i++)
{
x = something...
//error when i will be elements;, put elements - 1
//instead of elements or < instead of <=
}
this error is often raised when working especially with arrays and strings. For example
int len = strlen(somestring);
char* acopy = new char[len];//to avoid error put there len+1
strcpy(acopy, somestrimg);//there is an error
Many of these errors you will not get when working in release mode or when just lauching the exe module. But these errors are dangerous.
Ion Filipski
- Thread starter
- #4
- Status