char数组在运行时字符串？

Question

I have trouble to copy a char array into a String . The following line works fine:

String packetBufferString(packetBuffer);

But obviously I can do this only once, since packetBufferString has to be global and cannot be declared again. The problem is that packetBuffer changes at runtime but I can't update packetBufferString .

The char array is set up with

char packetBuffer[UDP_TX_PACKET_MAX_SIZE];

lg, couka

Answer 1

If String is std::string then you can write

std::string packetBufferString(packetBuffer);

//

packetBufferString.assign(packetBuffer);

or

std::string packetBufferString(packetBuffer);

//

packetBufferString  = packetBuffer;

provided that packetBuffer is zero-terminated. Otherwise you can do the same (that is assigning) but using initial and ending iterators for packetBuffer