Question

I have a structure and want to increase an array size whenever SendMessage function calls

struct MQStruct {
    wchar_t *serviceName; 
    int durability; 
    int msgType; 
    int msgHeader; 
    wchar_t *msgId; 
    wchar_t *payload; 
    int payloadSize; 
    int ttl; 
    int priority;
}MQStructObj[1];


int SendMessage(wchar_t *serviceName, int durability, int msgType, int msgHeader, wchar_t *msgId, wchar_t *payload, int payloadSize, int ttl, int priority) {

//Want to add one more array object and also preserve data of previous
MQStructObj[MAX+1]

return 0;
}

Answer 1

In C you will have to deal with dynamic memory (i.e allocate the array using malloc(), then take care to call free() when you stop using it etc.) yourself, and possibly use realloc() to grow an allocation.

In C++ the problem is already solved for you and you have std::vector. You may call push_back to add elements dynamically to it.