Pointer gets lost in the release build

The Problem is the following:

There is the call of a constructor, where a pointer is an argument

 m_pszBuf= new char[260];
//Still valid , to prove i'm printing the address
    std::cout <<"Address "<< (void*)m_pszBuf <<std::endl;
    device = new Device(m_pszBuf);


Device::Device(char* _ptr){
strcpy(dest,_ptr);
}

Interesting is, before the call of the constructor, the pointer is still valid and has an address and value, but as soon as it entered the ctor, it becomes a bad pointer (0x0000005c). In addition, it is working in the debug mode but not in the release mode.

You initialize m_pszBuf like this:

m_pszBuf = new char[260];

then you call Device constructor like this:

device = new Device(m_pszBuf);

Inside Device constructor, there is a strcpy call from m_pszBuf source:

Device::Device(char* _ptr) // _ptr == m_pszBuf
{
    strcpy(dest, _ptr);
}

But if m_pszBuf is not NUL-terminated, strcpy doesn't stop at the end of the allocated buffer, and it can copy garbage from out-of-bounds memory, and you can overrun the dest buffer.

So, before passing m_pszBuf to Device constructor, make sure that it is NUL-terminated and that strcpy destination pointer is big enough.

Note: This analysis is based just on the code snippet you showed. (I don't know if in your actual code that you omitted to show there are other problems.)