Allocate space in struct for char* array - arrays

Question

I am trying to allocate space inside a struct. This struct contains information of a network packet.
The structure:
struct STRUCT_SVC_ROOM_CREATE
{
PacketHeader Header;
unsigned char TitleLength;
char* RoomTitle = new char[TitleLength];
short SuddenFactor;
short GameModeFactor;
unsigned char Password[4];
int MaxMen;
};
See this two lines of code
unsigned char TitleLength;
char* RoomTitle = new char[TitleLength];
1st -> The length of text (1 byte)
2nd -> The text itself (TitleLength bytes)
And this is how I create the struct based into another.
STRUCT_SVC_ROOM_CREATE* RoomCreate = (STRUCT_SVC_ROOM_CREATE*)pHeader;
pHeader is another struct, this contains all the information. Then I put into another struct to get the right data location.
But it doesnt work. So the question: How to allocate space correctly and build the struct char* with the size specified in TitleLength?

Answer 1

You shouldnt initialise the object inside the struct definition.
struct STRUCT_SVC_ROOM_CREATE
{
PacketHeader Header;
unsigned char TitleLength;
char* RoomTitle;
short SuddenFactor;
short GameModeFactor;
unsigned char Password[4];
int MaxMen;
};
void someFunction()
{
STRUCT_SVC_ROOM_CREATE* foo = new STRUCT_SVC_ROOM_CREATE;
foo->TitleLength = 10;
foo->RoomTitle = new char[foo->TitleLength];
}
Here is the requested class implementation (not tested):
class SVC_ROOM_CREATE{
private:
PacketHeader Header;
char* RoomTitle;
short SuddenFactor;
short GameModeFactor;
unsigned char Password[4];
int MaxMen;
public:
SVC_ROOM_CREATE(PacketHeader packet_header, int length, short sud_factor, short gm_factor, unsigned char pwd[], int max)
{
Header = packet_header;
RoomTitle = new char[length];
SuddenFactor = sud_factor;
GameModeFactor = gm_factor;
memcpy( Password, pwd, sizeof(Password));
MaxMen = max;
}
};
int _tmain(int argc, _TCHAR* argv[])
{
PacketHeader Header;
unsigned char bar[4] = "pas";
int TitleLength = 10;
int SuddenFactor = 1;
int GameModeFactor = 2;
int MaxMen = 15;
SVC_ROOM_CREATE* foo = new SVC_ROOM_CREATE(Header, TitleLength, SuddenFactor, GameModeFactor, bar, MaxMen);
return 0;
}