Question

I have created structure :

struct buffer
{
    string ProjectName ;
    string ProjectID ;
}

buffer buf;
buf.ProjectID = "212";
buf.ProjectName = "MyProj";

Now to send this structure using sendto method , I am typecasting the strucure and sending it back as below:

char *sendbuf = (char*)&buf;
sentbytes = sendto(sock,sendbuf,strlen(sendbuf),0,(sockaddr*)&their_addr,sizeof(their_addr));

But while I am casting my Struct ti char* the actual data is loosing it’s values and while debugging I see sendbuf is containing some other values.

Can some one let me know how can I send the above structure using sendto.

Answer 1

You need to create the structure using POD, the string is not something you can use in that way. Instead you need to declare it something like

struct buffer
{
  char ProjectName[MAX_LENGTH_PROJECT_NAME+1];
  char ProjectID[MAX_LENGTH_PROJECT_ID+1];
};

EDIT: clarification, the string contains a pointer to a heap allocated memory block, so you are not actually sending the characters when you try to send that structure.