如何在运行时增加结构数组的大小

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 (ie 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.