About 0x ??? in VC ???? Unhandled exception: 0xc0000005

Reproduced in: http://hi.baidu.com/andywangcn/item/4b5a31594a06f1c8d2e10cc2

"An unhandled exception occurred at 0x00414030 in test.exe: 0xc0000005: The write location is 0 xfeeefeee."Appears0xc0000005The reason is generally because no memory is allocated or the memory is invalid,

For example:

# Include "stdafx. H"
# Include <string>
Using namespace STD;

Int _ tmain (INT argc, _ tchar * argv [])
{

String * s = NULL;
S = new string ();
Delete S;

If (s! = NULL)
{
* S = "test"; // This step will cause an exception.
}

Return 0;
}

Although S has been deleted, but s value is not null, if statement judgment will be invalid, this is a common error for beginners!

To prevent this error, you can define a macro to handle the delete operation.

# DEFINE _ Delete (OBJ) if (OBJ! = NULL) {Delete OBJ, OBJ = NULL ;}

Use this macro to prevent similar errors.