在C ++中使用memcmp在与Valgrind一起运行时会导致内存泄漏

Question

I am using memcmp for comparing the char pointer to empty string as:

if((0 == memcmp("", pcNewBeginPtr, 1))){
    // do some stuff
}

I am able to compare this, but while running through Valgrind, I get this error message:

Invalid read of size 1 at this line.

Answer 1

Amazingly, you could read the docs to see what the "invalid read" message means. Eg you don't legitimately have read access to the memory at pcNewBeginPtr : it's already been freed, wasn't validly initialised to point at a char buffer, points to a local variable in a scope that's already exited etc....

You might read some other questions: eg here .