How to resolve access exceptions in the memcpy function…

In C++, the memcpy function is used to copy a block of data from source memory to destination memory. When using the memcpy function, accessing exceptions may occur for various reasons.

1. The target memory’s capacity is insufficient to accommodate the data in the source memory.
2. The pointers of the source memory and the target memory are null pointers.
3. The pointers of the source memory and destination memory overlap.

To address these abnormalities, the following measures can be taken:

1. The size of

char src[10] = "Hello";
char dest[20];
memcpy(dest, src, sizeof(src));

1. copy data from one memory location to another

char* src = nullptr;
char dest[10];
// 检查源内存指针是否为空
if (src != nullptr) {
    memcpy(dest, src, sizeof(dest));
}

1. move the memory
2. copy data from one location to another
3. relocate
4. copy data from one location to another

char str[] = "Hello";
memmove(str + 1, str, strlen(str) + 1);

In conclusion, the key to resolving access exceptions in the memcpy function is to ensure the correctness of the source and destination memory, and to be mindful of handling overlapping pointers.